What this read moved
1–25 of 25agent-sdk/typescript Changed · +13 / -9 lines
This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.
from line 553
553553
554554| Method | Description |
555555| :------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
556| `interrupt()` | Interrupts the query. Only available in streaming input mode. When the CLI advertises the `interrupt_receipt_v1` capability in [`SDKSystemMessage.capabilities`](#sdksystemmessage), resolves with an [`SDKControlInterruptResponse`](#sdkcontrolinterruptresponse) listing the queued messages that survive the interrupt. Resolves `undefined` on CLIs before v2.1.205 |
556| `interrupt()` | Interrupts the query. Only available in streaming input mode. When the CLI advertises the `interrupt_receipt_v1` capability in [`SDKSystemMessage.capabilities`](#sdksystemmessage), resolves with an [`SDKControlInterruptResponse`](#sdkcontrolinterruptresponse) listing the messages that were pending when the interrupt arrived. Resolves `undefined` on CLIs before v2.1.205 |
557557| `rewindFiles(userMessageId, options?)` | Restores files to their state at the specified user message. Pass `{ dryRun: true }` to preview changes. Requires `enableFileCheckpointing: true`. See [File checkpointing](/docs/en/agent-sdk/file-checkpointing) |
558558| `setPermissionMode()` | Changes the permission mode (only available in streaming input mode) |
559559| `setModel()` | Changes the model (only available in streaming input mode). Passing `undefined` or the string `"default"` resets to the session default model |
from line 677
677677};
678678```
679679
680`still_queued` lists the UUIDs of user messages that survive the interrupt: messages still in the queue, plus any messages Claude Code had already taken off the queue for the next turn before the interrupt arrived. Claude Code processes the listed messages after the interrupt unless you cancel them first, and can merge several into one turn. Use the receipt to decide whether to resend anything. Resending a message that is already listed delivers it to Claude twice.
680`still_queued` lists the UUIDs of the user messages that were pending when the interrupt arrived: messages still in the queue, plus any messages Claude Code had already taken off the queue for the next turn. Once the session's first turn has started, Claude Code processes the listed messages after the interrupt unless you cancel them first, and can merge several into one turn. If you interrupt before the first turn starts, Claude Code aborts that turn as soon as it starts, and the listed messages in that turn get no response.
681681
682Use the receipt to decide whether to resend anything. A listed message that you don't cancel enters the conversation whether or not it gets a response, so resending it delivers it to Claude twice.
683
682684Interpret the list with these caveats:
683685
684686* Only messages that were enqueued with a UUID appear. An empty array doesn't mean nothing else will run.
from line 1431
14291431
14301432The `capabilities` array names the protocol behaviors this CLI implements, so you can feature-detect instead of comparing `claude_code_version` strings. It is an open set: ignore values you don't recognize, and check for the specific capability whose behavior you rely on. The field requires Claude Code v2.1.205 or later and is absent on earlier CLIs.
14311433
1432| Capability | Meaning |
1433| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
1434| `interrupt_receipt_v1` | [`interrupt()`](#query-object) resolves with an [`SDKControlInterruptResponse`](#sdkcontrolinterruptresponse) receipt naming the queued messages that survive the interrupt |
1435| `interrupt_cancel_queued_v1` | The `interrupt` control request honors `cancel_queued: true`, cancelling the queued messages that would otherwise survive the interrupt and listing them on the receipt's `cancelled` field. See [`SDKControlInterruptResponse`](#sdkcontrolinterruptresponse). Requires Claude Code v2.1.219 or later |
1434| Capability | Meaning |
1435| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
1436| `interrupt_receipt_v1` | [`interrupt()`](#query-object) resolves with an [`SDKControlInterruptResponse`](#sdkcontrolinterruptresponse) receipt listing the messages that were pending when the interrupt arrived |
1437| `interrupt_cancel_queued_v1` | The `interrupt` control request honors `cancel_queued: true`, cancelling the messages the receipt would otherwise list under `still_queued` and listing them under `cancelled` instead. See [`SDKControlInterruptResponse`](#sdkcontrolinterruptresponse). Requires Claude Code v2.1.219 or later |
14361438
14371439### `SDKPartialAssistantMessage`
14381440
from line 3521
35193521**Tool name:** `Write`
35203522
35213523```typescript theme={null}
3522type FileWriteOutput = {
3523 type: "create" | "update";
3524 filePath: string;
3525 content: string;
3526 structuredPatch: Array<{
3527 oldStart: number;
3528 oldLines: number;
3529 newStart: number;
3530 newLines: number;
3531 lines: string[];
3532 }>;
3533 originalFile: string | nu
3524type FileWriteOutput =
cloud-environments Changed · +4 / -1 lines
from line 204
204204
205205Sessions in this environment can now reach `api.example.com`, any subdomain of `internal.example.com`, and `registry.example.com`, and no other domains through the session's network. [GitHub traffic](#github-proxy), [MCP connector traffic](#network-access), and requests to the hosts of the environment's [API credentials](#add-api-credentials), other than the [hosts the agent proxy skips](#requests-that-never-get-the-credential), don't go through this allowlist. A leading `*.` matches every subdomain. To keep the [Trusted domains](#default-allowed-domains) too, check **Also include default list of common package managers**; leave it unchecked to allow only what you list.
206206
207If sessions in the environment work with [artifacts](/docs/en/artifacts), include `*.frame.claudeusercontent.com` in your list. Claude Code fetches artifact content from that host. If you leave it out, Claude can't read artifacts in sessions that run in the environment.
207If your organization uses [artifacts](/docs/en/artifacts#availability), you don't need `*.frame.claudeusercontent.com` in the list for sessions to read them. When the list leaves that host out, Claude Code reads artifact content through the session's connection to Anthropic instead. Keep the host in an allowlist in two situations:
208
209* **Sessions in this environment open another organization's public artifacts**: Claude Code fetches those from the host directly, so add it to this list.
210* **You're configuring the local CLI or a self-hosted runner**: keep the host in that allowlist. See [network access requirements](/docs/en/network-config#network-access-requirements) and the self-hosted [network requirements](/docs/en/self-hosted-environments-deploy#network-requirements).
208211
209212Each environment has its own allowed-domains list; there's no organization-level allowlist that admins can push to every member's environments. [Server-managed settings](/docs/en/server-managed-settings) still apply inside cloud sessions, but none of them adds domains to the environment's network allowlist.
210213
env-vars Changed · +354 / -354 lines
This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.
from line 127
127127 One other variable has its own rule: `FORCE_HYPERLINK` reads a number, so only `0` turns it off. Each variable's row also states its own rule.
128128</Note>
129129
130| Variable | Purpose |
131| :------------------------------------------------------ | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
132| `ANTHROPIC_API_KEY` | API key sent as `X-Api-Key` header. When set, this key is used instead of your Claude Pro, Max, Team, or Enterprise subscription even if you are logged in. In non-interactive mode (`-p`), the key is always used when present. In interactive mode, you are prompted to approve the key once before it overrides your subscription. To use your subscription instead, run `unset ANTHROPIC_API_KEY` |
133| `ANTHROPIC_AUTH_TOKEN` | Custom value for the `Authorization` header (the value you set here will be prefixed with `Bearer `) |
134| `ANTHROPIC_AWS_API_KEY` | Workspace API key for [Claude Platform on AWS](/docs/en/claude-platform-on-aws), generated in the AWS Console. Sent as `x-api-key` and takes precedence over AWS SigV4 |
135| `ANTHROPIC_AWS_BASE_URL` | Override the [Claude Platform on AWS](/docs/en/claude-platform-on-aws) endpoint URL. Use for custom regions or when routing through an [LLM gateway](/docs/en/llm-gateway). Defaults to `https://aws-external-anthropic.{region}.api.aws`. Claude Code resolves the region with the [same precedence as on Amazon Bedrock](/docs/en/amazon-bedrock#3-configure-claude-code) |
136| `ANTHROPIC_AWS_WORKSPACE_ID` | Required for [Claude Platform on AWS](/docs/en/claude-platform-on-aws). Sent on every request as the `anthropic-workspace-id` header |
137| `ANTHROPIC_BASE_URL` | Override the API endpoint to route requests through a proxy or gateway. When set to a non-first-party host, [MCP tool search](/docs/en/mcp#scale-with-mcp-tool-search) is disabled by default. Set `ENABLE_TOOL_SEARCH=true` if your proxy forwards `tool_reference` blocks. As of v2.1.196, [Remote Control](/docs/en/remote-control#requirements) is disabled when this points at a host other than `api.anthropic.com`, matching its behavior on Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry |
138| `ANTHROPIC_BEDROCK_BASE_URL` | Override the Amazon Bedrock endpoint URL. Use for custom Amazon Bedrock endpoints or when routing through an [LLM gateway](/docs/en/llm-gateway). See [Amazon Bedrock](/docs/en/amazon-bedrock) |
139| `ANTHROPIC_BEDROCK_MANTLE_BASE_URL` | Override the Amazon Bedrock Mantle endpoint URL. See [Mantle endpoint](/docs/en/amazon-bedrock#use-the-mantle-endpoint) |
140| `ANTHROPIC_BEDROCK_REGION_PREFIX` | Cross-region inference profile prefix (`us`, `eu`, `apac`, `jp`, `au`, or `global`) Claude Code tries first instead of the one derived from the AWS region. Ignored in AWS GovCloud regions. Requires Claude Code v2.1.224 or later. See [Amazon Bedrock](/docs/en/amazon-bedrock#cross-region-inference-profile-prefixes) |
141| `ANTHROPIC_BEDROCK_SERVICE_TIER` | Amazon Bedrock [service tier](https://docs.aws.amazon.com/bedrock/latest/userguide/service-tiers-inference.html) (`default`, `flex`, or `priority`). Sent as the `X-Amzn-Bedrock-Service-Tier` header. See [Amazon Bedrock](/docs/en/amazon-bedrock#service-tiers) |
142| `ANTHROPIC_BETAS` | Comma-separated list of additional `anthropic-beta` header values to include in API requests. Claude Code already sends the beta headers it needs; use this to opt into an [Anthropic API beta](https://platform.claude.com/docs/en/api/beta-headers) before Claude Code adds native support. Unlike the [`--betas` flag](/docs/en/cli-reference#cli-flags), which requires API key authentication, this variable works with all auth methods including Claude.ai subscription |
143| `ANTHROPIC_CUSTOM_HEADERS` | Custom headers to add to requests (`Name: Value` format, newline-separated for multiple headers). If a name or value contains a character an HTTP header can't carry, such as a curly quote or a zero-width space, the request fails with an error that identifies the pair by position. Requires Claude Code v2.1.227 or later. [Invalid request header value](/docs/en/errors#invalid-request-header-value) lists the exact character set and where the check runs. A value that sets a credential, org or tenant, routing, or API-behavior header, such as `Authorization` or `Host`, counts as a [setting that needs approval](/docs/en/server-managed-settings#environment-variables-and-the-approval-dialog) when server-managed settings deliver it. From project or local settings, such a value follows the [rules for when `env` values apply](/docs/en/settings-reference#when-claude-code-applies-env-values) |
144| `ANTHROPIC_CUSTOM_MODEL_OPTION` | Model ID to add as a custom entry in the `/model` picker. Use this to make a non-standard or gateway-specific model selectable without replacing built-in aliases. See [Model configuration](/docs/en/model-config#add-a-custom-model-option) |
145| `ANTHROPIC_CUSTOM_MODEL_OPTION_DESCRIPTION` | Display description for the custom model entry in the `/model` picker. Defaults to `Custom model (<model-id>)` when not set |
146| `ANTHROPIC_CUSTOM_MODEL_OPTION_NAME` | Display name for the custom model entry in the `/model` picker. Defaults to the model ID when not set |
147| `ANTHROPIC_CUSTOM_MODEL_OPTION_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the custom model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
148| `ANTHROPIC_DEFAULT_FABLE_MODEL` | Model ID that the `fable` alias resolves to, and the ID Claude Code recognizes as a Fable model for [automatic model fallback](/docs/en/model-config#automatic-model-fallback) on third-party providers. See [Model configuration](/docs/en/model-config#environment-variables) |
149| `ANTHROPIC_DEFAULT_FABLE_MODEL_DESCRIPTION` | Display description for the pinned Fable model in the `/model` picker. Defaults to `Custom Fable model` when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
150| `ANTHROPIC_DEFAULT_FABLE_MODEL_NAME` | Display name for the pinned Fable model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
151| `ANTHROPIC_DEFAULT_FABLE_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Fable model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
152| `ANTHROPIC_DEFAULT_HAIKU_MODEL` | Model ID that the `haiku` alias resolves to, also used for [background functionality](/docs/en/costs#background-token-usage). See [Model configuration](/docs/en/model-config#environment-variables) |
153| `ANTHROPIC_DEFAULT_HAIKU_MODEL_DESCRIPTION` | Display description for the pinned Haiku model in the `/model` picker. Defaults to `Custom Haiku model` when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
154| `ANTHROPIC_DEFAULT_HAIKU_MODEL_NAME` | Display name for the pinned Haiku model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
155| `ANTHROPIC_DEFAULT_HAIKU_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Haiku model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
156| `ANTHROPIC_DEFAULT_MODEL` | Model that new sessions start on by default. Requires Claude Code v2.1.236 or later. See [Set a default model for new sessions](/docs/en/model-config#set-a-default-model-for-new-sessions) |
157| `ANTHROPIC_DEFAULT_OPUS_MODEL` | Model ID that the `opus` alias resolves to, and that `opusplan` uses while Plan Mode is active. See [Model configuration](/docs/en/model-config#environment-variables) |
158| `ANTHROPIC_DEFAULT_OPUS_MODEL_DESCRIPTION` | Display description for the pinned Opus model in the `/model` picker. When not set, defaults to `Custom Opus model`, or `Custom Opus model (1M context)` if the pinned model ID has the `[1m]` suffix and `CLAUDE_CODE_DISABLE_1M_CONTEXT` isn't turned on. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
159| `ANTHROPIC_DEFAULT_OPUS_MODEL_NAME` | Display name for the pinned Opus model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
160| `ANTHROPIC_DEFAULT_OPUS_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Opus model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
161| `ANTHROPIC_DEFAULT_SONNET_MODEL` | Model ID that the `sonnet` alias resolves to, and that `opusplan` uses when Plan Mode is not active. See [Model configuration](/docs/en/model-config#environment-variables) |
162| `ANTHROPIC_DEFAULT_SONNET_MODEL_DESCRIPTION` | Display description for the pinned Sonnet model in the `/model` picker. When not set, defaults to `Custom Sonnet model`, or `Custom Sonnet model (1M context)` if the pinned model ID has the `[1m]` suffix and `CLAUDE_CODE_DISABLE_1M_CONTEXT` isn't turned on. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
163| `ANTHROPIC_DEFAULT_SONNET_MODEL_NAME` | Display name for the pinned Sonnet model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
164| `ANTHROPIC_DEFAULT_SONNET_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Sonnet model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
165| `ANTHROPIC_FEDERATION_RULE_ID` | Federation rule ID for [Workload Identity Federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). When you set it together with `ANTHROPIC_ORGANIZATION_ID`, Claude Code selects federation credentials, which rank above your `/login` credential. See [authentication precedence](/docs/en/authentication#authentication-precedence) |
166| `ANTHROPIC_FOUNDRY_API_KEY` | API key for Microsoft Foundry authentication (see [Microsoft Foundry](/docs/en/microsoft-foundry)) |
167| `ANTHROPIC_FOUNDRY_AUTH_TOKEN` | Bearer token for Microsoft Foundry authentication, such as a Microsoft Entra access token. Claude Code sends it as the `Authorization: Bearer` header. Takes precedence over `ANTHROPIC_FOUNDRY_API_KEY` and over the Azure default credential chain. See [Microsoft Foundry](/docs/en/microsoft-foundry). Requires Claude Code v2.1.203 or later |
168| `ANTHROPIC_FOUNDRY_BASE_URL` | Full base URL for the Microsoft Foundry resource (for example, `https://my-resource.services.ai.azure.com/anthropic`). Alternative to `ANTHROPIC_FOUNDRY_RESOURCE` (see [Microsoft Foundry](/docs/en/microsoft-foundry)) |
169| `ANTHROPIC_FOUNDRY_RESOURCE` | Microsoft Foundry resource name (for example, `my-resource`). Required if `ANTHROPIC_FOUNDRY_BASE_URL` is not set (see [Microsoft Foundry](/docs/en/microsoft-foundry)) |
170| `ANTHROPIC_MODEL` | Name of the model setting to use (see [Model Configuration](/docs/en/model-config#environment-variables)) |
171| `ANTHROPIC_ORGANIZATION_ID` | Organization ID for [Workload Identity Federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). Set it together with `ANTHROPIC_FEDERATION_RULE_ID`. See [authentication precedence](/docs/en/authentication#authentication-precedence) |
172| `ANTHROPIC_PROFILE` | Name of the Anthropic profile to authenticate with, such as one created by [`ant auth login`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/authentication) or by [signing in to a Console account without an API key](/docs/en/authentication#sign-in-without-an-api-key). See [authentication precedence](/docs/en/authentication#authentication-precedence) |
173| `ANTHROPIC_SMALL_FAST_MODEL` | \[DEPRECATED] Name of [Haiku-class model for background tasks](/docs/en/costs) |
174| `ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION` | Override AWS region for the Haiku-class model when using Amazon Bedrock or Amazon Bedrock Mantle. On Amazon Bedrock, this only takes effect when `ANTHROPIC_DEFAULT_HAIKU_MODEL` or the deprecated `ANTHROPIC_SMALL_FAST_MODEL` is also set, since Amazon Bedrock otherwise runs background tasks on the [default Sonnet model or the primary model](/docs/en/amazon-bedrock#4-pin-model-versions) in the session region |
175| `ANTHROPIC_VERTEX_BASE_URL` | Override Google Cloud's Agent Platform endpoint URL. Use for custom Google Cloud's Agent Platform endpoints or when routing through an [LLM gateway](/docs/en/llm-gateway). See [Google Cloud's Agent Platform](/docs/en/google-vertex-ai) |
176| `ANTHROPIC_VERTEX_PROJECT_ID` | GCP project ID for Google Cloud's Agent Platform requests. Overridden by `GCLOUD_PROJECT`, `GOOGLE_CLOUD_PROJECT`, or the project in your `GOOGLE_APPLICATION_CREDENTIALS` credential file. See [Google Cloud's Agent Platform](/docs/en/google-vertex-ai) |
177| `ANTHROPIC_WORKSPACE_ID` | Workspace ID for [workload identity federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). Set this when your federation rule is scoped to more than one workspace so the token exchange knows which workspace to target |
178| `API_FORCE_IDLE_TIMEOUT` | Override the 5-minute body idle timeout that aborts a streaming model response when no bytes arrive. Set to `0` to turn the timeout off, for example when a slow [gateway](/docs/en/llm-gateway) or local model pauses longer than 5 minutes between chunks, or `1` to keep it on for every provider. When unset, the timeout is active on providers other than the direct Anthropic API and [Claude Platform on AWS](/docs/en/claude-platform-on-aws). The [stream watchdogs](/docs/en/network-config#streaming-idle-watchdogs) run independently of it and abort a long silent pause even when you set `0` here. Requires Claude Code v2.1.169 or later |
179| `API_TIMEOUT_MS` | Timeout for API requests in milliseconds (default: 600000, or 10 minutes; maximum: 2147483647). Increase this when requests time out on slow networks or when routing through a proxy. Values above the maximum overflow the underlying timer and cause requests to fail immediately |
180| `AWS_BEARER_TOKEN_BEDROCK` | Amazon Bedrock API key for authentication (see [Amazon Bedrock API keys](https://aws.amazon.com/blogs/machine-learning/accelerate-ai-development-with-amazon-bedrock-api-keys/)) |
181| `BASH_DEFAULT_TIMEOUT_MS` | Default timeout for long-running bash commands (default: 120000, or 2 minutes) |
182| `BASH_MAX_OUTPUT_LENGTH` | Maximum number of characters of bash output that Claude Code reads back into a command's result (default: 30000; maximum: 150000). If you set the [`bashOutputMaxChars`](/docs/en/settings-reference#bashoutputmaxchars) setting, Claude Code ignores this variable. See [Output limits](/docs/en/tools-reference#output-limits) |
183| `BASH_MAX_TIMEOUT_MS` | Maximum timeout the model can set for long-running bash commands (default: 600000, or 10 minutes). The effective ceiling is the larger of this and `BASH_DEFAULT_TIMEOUT_MS` |
184| `BETA_TRACING_ENDPOINT` | OTLP endpoint for [detailed beta tracing](/docs/en/monitoring-usage#traces-beta): with `ENABLE_BETA_TRACING_DETAILED=1`, logs and traces go there instead of to the configured exporters. Set it in your shell, user settings, or managed settings. Ignored in [project and local settings](/docs/en/settings-reference#variables-claude-code-ignores-in-env) |
185| `CCR_FORCE_BUNDLE` | Set to `1` to force [`claude --cloud`](/docs/en/claude-code-on-the-web#send-local-repositories-without-github) to bundle and upload your local repository even when GitHub access is available |
186| `CLAUDECODE` | Set to `1` in subprocesses Claude Code spawns (Bash and PowerShell tools, tmux sessions, [hook](/docs/en/hooks) commands, [status line](/docs/en/statusline) commands, stdio [MCP server](/docs/en/mcp) subprocesses). IDE extensions also set this in their integrated terminals. Use to detect when a script is running inside a subprocess spawned by Claude Code. To check whether the current process was spawned directly by a tool call or hook, rather than inside a stdio MCP server that Claude Code started, use `CLAUDE_CODE_CHILD_SESSION` instead |
187| `CLAUDE_AFK_COUNTDOWN_MS` | How many milliseconds before auto-continue the on-screen countdown appears on an unanswered [`AskUserQuestion`](/docs/en/tools-reference) dialog. Default `20000` (20 seconds), capped at the auto-continue timeout. Has no effect unless auto-continue is on; see the [`askUserQuestionTimeout`](/docs/en/settings-reference#askuserquestiontimeout) setting and `CLAUDE_AFK_TIMEOUT_MS`. Requires Claude Code v2.1.198 or later |
188| `CLAUDE_AFK_TIMEOUT_MS` | How many milliseconds of idle time before an unanswered [`AskUserQuestion`](/docs/en/tools-reference) dialog auto-continues without you. Auto-continue is off by default; opt in with the [`askUserQuestionTimeout`](/docs/en/settings-reference#askuserquestiontimeout) setting. This variable is an override for demos and automated tests: when set, it takes precedence over that setting and turns auto-continue on even when the setting is unset or `never`. Setting `0` doesn't turn the timeout off; it closes the dialog immediately. In v2.1.198 and v2.1.199, auto-continue was on by default with a `60000` (60 seconds) timeout. Requires Claude Code v2.1.198 or later |
189| `CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS` | Set to `1` to disable all built-in [subagent](/docs/en/sub-agents) types such as Explore and Plan. Only applies in non-interactive mode (the `-p` flag). Useful for SDK users who want a blank slate. This also removes `general-purpose`, the subagent Claude Code runs when an Agent tool call omits `subagent_type`. Such a call then fails with [`subagent_type is required`](/docs/en/errors#subagent-type-is-required) |
190| `CLAUDE_AGENT_SDK_MCP_NO_PREFIX` | Set to `1` to skip the `mcp__<server>__` prefix on tool names from SDK-created MCP servers. Tools use their original names. SDK usage only |
191| `CLAUDE_ASYNC_AGENT_STALL_TIMEOUT_MS` | Stall timeout in milliseconds for subagents. Default `600000` (10 minutes); if you raise `CLAUDE_STREAM_IDLE_TIMEOUT_MS` while the stream watchdog is on, the default rises with it, as [Handle slow or stalled API responses](/docs/en/agent-sdk/typescript#handle-slow-or-stalled-api-responses) describes. The timer resets on each streaming progress event; if no progress arrives within the window, Claude Code aborts the subagent and reports the stall to the parent |
192| `CLAUDE_AUTOCOMPACT_PCT_OVERRIDE` | Set the percentage (1-100) of the auto-compact window at which auto-compaction triggers. Use lower values like `50` to compact earlier; the variable can't raise the threshold, so values above the default percentage are ignored. It applies only in sessions that [compact before the model's context limit](/docs/en/model-config#context-window-and-auto-compaction). Applies to both main conversations and subagents |
193| `CLAUDE_AUTO_BACKGROUND_TASKS` | Set to `1` to force-enable automatic backgrounding of long-running agent tasks. When enabled, subagents are moved to the background after running for approximately two minutes. Also enables [automatic backgrounding of long MCP tool calls](/docs/en/mcp#automatic-backgrounding-of-long-tool-calls) in non-interactive mode on Claude Code v2.1.212 or later |
194| `CLAUDE_AX_PREPARK_MS` | In [screen reader mode](/docs/en/accessibility#what-your-screen-reader-hears), how many milliseconds Claude Code waits, with the cursor at the start of the line, before it writes a new or changed line. Default `50`. Set `0` to write immediately. Claude Code caps the wait at `5000`. Requires Claude Code v2.1.233 or later |
195| `CLAUDE_AX_SCREEN_READER` | Set to `1` to render screen-reader friendly output: flat text without decorative borders or animations. Set to `0` to force screen-reader mode off even when [`axScreenReader`](/docs/en/settings-reference#axscreenreader) is `true`. The [`--ax-screen-reader`](/docs/en/cli-reference#cli-flags) flag takes precedence. Requires Claude Code v2.1.181 or later |
196| `CLAUDE_AX_STARTUP_QUIET_MS` | In [screen reader mode](/docs/en/accessibility), how many milliseconds Claude Code holds the first interface render after the startup confirmation line, so your screen reader can speak the line in full before new output interrupts it. Default `3000`. Set `0` to render immediately. Claude Code caps the hold at `600000` (10 minutes). Your first keystroke ends the hold early. Requires Claude Code v2.1.217 or later |
197| `CLAUDE_BASH_MAINTAIN_PROJECT_WORKING_DIR` | Return to the original working directory after each Bash or PowerShell command in the main session |
198| `CLAUDE_BYTE_STREAM_IDLE_TIMEOUT_MS` | Timeout in milliseconds for the byte-level streaming idle watchdog; when set, it takes precedence over `CLAUDE_STREAM_IDLE_TIMEOUT_MS` for that watchdog and leaves the event-level watchdog unchanged. Claude Code clamps this variable to between 10 seconds and 30 minutes. Requires Claude Code v2.1.210 or later |
199| `CLAUDE_CLIENT_PRESENCE_FILE` | Path to a file that an external tool, such as a screen-lock listener, creates when you unlock your screen and deletes when you lock it. While the file exists, Claude Code skips [Remote Control mobile push notifications](/docs/en/remote-control#mobile-push-notifications), so you stop getting pushes while you are actively using the computer. When the file is absent or unreadable, notifications are sent as normal. Claude Code checks the file once per push-triggering event rather than polling it. Requires Claude Code v2.1.181 or later |
200| `CLAUDE_CODE_ACCESSIBILITY` | Set to `1` to keep the native terminal cursor visible and disable the inverted-text cursor indicator. Allows screen magnifiers like macOS Zoom to track cursor position |
201| `CLAUDE_CODE_ADDITIONAL_DIRECTORIES_CLAUDE_MD` | Set to `1` to load memory files from directories specified with `--add-dir`. Loads `CLAUDE.md`, `.claude/CLAUDE.md`, `.claude/rules/*.md`, and `CLAUDE.local.md`. By default, additional directories do not load memory files |
202| `CLAUDE_CODE_ALT_SCREEN_FULL_REPAINT` | Set to `1` to repaint the entire screen on every frame in [fullscreen rendering](/docs/en/fullscreen) instead of sending incremental updates. Use this if fullscreen mode shows stale or misplaced text fragments. Claude Code enables this automatically for background sessions and [agent view](/docs/en/agent-view) on Windows |
203| `CLAUDE_CODE_ALWAYS_ENABLE_EFFORT` | Set to `1` to send the [effort](/docs/en/model-config#adjust-effort-level) parameter with every request, even when Claude Code does not recognize the model ID as effort-capable. Use this when routing through an [LLM gateway](/docs/en/llm-gateway) or third-party provider that serves models under custom identifiers. Models that reject the effort parameter at the API, including Claude 3 models, Sonnet 4.0 and 4.5, Opus 4.0 and 4.1, and Haiku 4.5, are still excluded so requests do not fail |
204| `CLAUDE_CODE_API_KEY_HELPER_TTL_MS` | Interval in milliseconds at which credentials should be refreshed (when using [`apiKeyHelper`](/docs/en/settings-reference#apikeyhelper)) |
205| `CLAUDE_CODE_ARTIFACT_AUTO_OPEN` | Set to `0` to stop Claude Code from opening the browser automatically when a new [artifact](/docs/en/artifacts) is published. Republishing an existing artifact does not open the browser regardless of this setting |
206| `CLAUDE_CODE_ARTIFACT_COMMENTS` | Set to `0` to stop Claude reading and replying to [comments on an artifact](/docs/en/artifacts#collect-comments-on-an-artifact). Has no effect when `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC` has [turned artifacts off](/docs/en/artifacts#availability). Requires Claude Code v2.1.221 or later |
207| `CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT` | Set to `0` to stop Claude [replying on its own to comments sent to it](/docs/en/artifacts#let-claude-reply-to-comments-on-its-own). Requires Claude Code v2.1.228 or later |
208| `CLAUDE_CODE_ATTRIBUTION_HEADER` | Set to `0` to omit the [attribution block](/docs/en/llm-gateway-protocol#system-prompt-attribution-block), which carries the client version and a prompt fingerprint, from the start of the system prompt. Caching on a direct connection to the Anthropic API is unaffected either way. In some direct-connection setups, Claude Code keeps the block on [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode) classifier requests even when you set `0`. In [System prompt attribution block](/docs/en/llm-gateway-protocol#system-prompt-attribution-block), check which connections and credentials this covers. Before v2.1.181 the block included a per-request token on custom base URLs and Microsoft Foundry connections, so on those versions set it to `0` when your LLM gateway caches on the request body or forwards requests to a third-party provider, or when you connect to Microsoft Foundry directly |
209| `CLAUDE_CODE_AUTO_BACKGROUND_WORKER_CHECKIN_SECONDS` | When `CLAUDE_AUTO_BACKGROUND_TASKS` is enabled, seconds between reminders to Claude to check on [background subagents](/docs/en/sub-agents#run-subagents-in-foreground-or-background) that are still running. Accepts a plain integer from `1` to `86400` only; any other value or spelling reads as unset. When unset, there are no check-in reminders. Requires Claude Code v2.1.248 or later |
210| `CLAUDE_CODE_AUTO_COMPACT_WINDOW` | Set the [auto-compact window](/docs/en/model-config#set-the-auto-compact-window) in tokens, from `100000` to `1000000`. Accepts a plain integer such as `500000` only: a value like `500k` reads as `500` and clamps to the 100K minimum. The effective window is also capped at the model's context window. Takes precedence over the `/autocompact` command, the `--autocompact` flag, and the `autoCompactWindow` setting. The status line's `used_percentage` always measures against the model's full context window, so once this variable is set, that percentage no longer indicates when compaction will run |
211| `CLAUDE_CODE_AUTO_CONNECT_IDE` | Override automatic [IDE connection](/docs/en/vs-code). By default, Claude Code connects automatically when launched inside a supported IDE's integrated terminal. Set to `false` to prevent this. Set to `true` to force a connection attempt when auto-detection fails, such as when tmux obscures the parent terminal. Takes precedence over the [`autoConnectIde`](/docs/en/settings-reference#autoconnectide) global config setting |
212| `CLAUDE_CODE_AWS_CHAIN_RESOLVE_TIMEOUT_MS` | Time in milliseconds Claude Code waits for the AWS default credential provider chain to produce credentials before the request fails with [`AWS default-chain credential resolve timed out`](/docs/en/errors#aws-default-chain-credential-resolve-timed-out) (default: `60000`). Raise it when a step in your chain legitimately needs longer, such as a browser-based SSO sign-in with MFA through a wrapper like `aws-vault`. Applies wherever Claude Code signs with the default chain: [Amazon Bedrock](/docs/en/amazon-bedrock#credential-caching-and-resolution-timeout), [Claude Platform on AWS](/docs/en/claude-platform-on-aws), and the [Mantle endpoint](/docs/en/amazon-bedrock#use-the-mantle-endpoint). Requires Claude Code v2.1.207 or later |
213| `CLAUDE_CODE_BRIDGE_SESSION_ID` | Set automatically in Bash tool and [hook command](/docs/en/hooks) subprocesses while the session has an active [Remote Control](/docs/en/remote-control) connection, and removed when the connection ends. The value is the session's ID in `session_` form, the same identifier that appears in the session's `claude.ai/code` URL, so a script can link back to the session that ran it. Requires Claude Code v2.1.199 or later. In [cloud sessions](/docs/en/claude-code-on-the-web), read `CLAUDE_CODE_REMOTE_SESSION_ID` instead |
214| `CLAUDE_CODE_BS_AS_CTRL_BACKSPACE` | Set to `0` to make Claude Code read the `0x08` byte, also written `^H`, as plain Backspace, or `1` to read it as Ctrl+Backspace. Either value replaces the platform default. By default, Claude Code reads it as Ctrl+Backspace on Windows, except when `TERM_PROGRAM` is `mintty` or `TERM` is `cygwin`, and as plain Backspace on macOS and Linux. Set `0` in a Windows terminal where [Backspace deletes a whole word](/docs/en/terminal-config#fix-backspace-deleting-a-whole-word-on-windows) |
215| `CLAUDE_CODE_CERT_STORE` | Comma-separated list of CA certificate sources for TLS connections. `bundled` is the Mozilla CA set shipped with Claude Code. `system` is the operating system trust store, read only on runtimes with `tls.getCACertificates`: the native binary, or Node 22.15 or later for npm installs. See [CA certificate store](/docs/en/network-config#ca-certificate-store). Default is `bundled,system` |
216| `CLAUDE_CODE_CHILD_SESSION` | Set to `1` in subprocesses Claude Code spawns via the Bash, PowerShell, and Monitor tools, [hook](/docs/en/hooks) commands, and [status line](/docs/en/statusline) commands. Not set for stdio [MCP server](/docs/en/mcp) subprocesses, which are long-lived and outlive the session that spawned them. Unlike `CLAUDECODE`, this is only set by Claude Code itself when it launches a subprocess and not by IDE extensions, so it reliably distinguishes a nested session from a top-level `claude` launched in an IDE-integrated terminal. A nested interactive `claude` TUI started this way is automatically excluded from `--resume`, `--continue`, up-arrow history, and the `claude agents` list. Non-interactive `claude -p` sessions still persist. Set `CLAUDE_CODE_FORCE_SESSION_PERSISTENCE=1` to override this exclusion. Requires Claude Code v2.1.172 or later |
217| `CLAUDE_CODE_CLIENT_CERT` | Path to client certificate file for mTLS authentication |
218| `CLAUDE_CODE_CLIENT_KEY` | Path to client private key file for mTLS authentication |
219| `CLAUDE_CODE_CLIENT_KEY_PASSPHRASE` | Passphrase for encrypted CLAUDE\_CODE\_CLIENT\_KEY (optional) |
220| `CLAUDE_CODE_CONNECT_TIMEOUT_MS` | Removed in v2.1.186 and now a no-op. Previously set a separate timeout for the connect, TLS, and response-header phase of a streaming API request. Use `API_TIMEOUT_MS` for the per-request timeout. For the response-header phase of a streaming request, see `CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS` |
221| `CLAUDE_CODE_DEBUG_LOGS_DIR` | Override the debug log file path. Despite the name, this is a file path, not a directory. Requires debug mode to be enabled separately via `--debug`, `/debug`, or the `DEBUG` environment variable: setting this variable alone does not enable logging. The [`--debug-file`](/docs/en/cli-reference#cli-flags) flag does both at once. Defaults to `~/.claude/debug/<session-id>.txt` |
222| `CLAUDE_CODE_DEBUG_LOG_LEVEL` | Minimum log level written to the debug log file. Values: `verbose`, `debug` (default), `info`, `warn`, `error`. Set to `verbose` to include high-volume diagnostics like full status line command output, or raise to `error` to reduce noise |
223| `CLAUDE_CODE_DISABLE_1M_CONTEXT` | Set to `1` to disable [1M context window](/docs/en/model-config#extended-context) support. When set, 1M model variants are unavailable in the model picker, and Claude Code holds sessions on models with a native 1M window, such as [Sonnet 5](/docs/en/model-config#sonnet-5-context-window) and the Fable models, to a 200K window; see [Extended context](/docs/en/model-config#extended-context) for how the hold is enforced. Useful for enterprise environments with compliance requirements. For its role in correcting the window for an unrecognized `[1m]` model ID, see [Correct the window for a gateway or custom model ID](/docs/en/model-config#correct-the-window-for-a-gateway-or-custom-model-id) |
224| `CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING` | Set to `1` to disable [adaptive reasoning](/docs/en/model-config#adjust-effort-level) on Opus 4.6 and Sonnet 4.6 and fall back to the fixed thinking budget controlled by `MAX_THINKING_TOKENS`. Has no effect on [Fable models](/docs/en/model-config#extended-thinking), Sonnet 5, or Opus 4.7 and later, which always use adaptive reasoning |
225| `CLAUDE_CODE_DISABLE_ADMIN_ENV_UNION` | Set to `1` to stop Claude Code from merging [managed settings](/docs/en/managed-settings#precedence-within-the-managed-tier) `env` blocks per key across admin sources, so only the highest-priority source's whole `env` block applies, as before v2.1.223. Set it in the environment that launches Claude Code, since Claude Code ignores a copy delivered through a settings `env` block. Requires Claude Code v2.1.223 or later |
226| `CLAUDE_CODE_DISABLE_ADVISOR_TOOL` | Set to `1` to disable the [advisor tool](/docs/en/advisor). The `/advisor` command becomes unavailable, any configured `advisorModel` is ignored, and the `--advisor` flag is accepted but has no effect, so existing scripts that pass it continue to work without errors |
227| `CLAUDE_CODE_DISABLE_AGENT_VIEW` | Set to `1` to turn off [background agents and agent view](/docs/en/agent-view): `claude agents`, `--bg`, `/background`, and the on-demand supervisor. Equivalent to the [`disableAgentView`](/docs/en/settings-reference#disableagentview) setting |
228| `CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN` | Set to `1` to disable [fullscreen rendering](/docs/en/fullscreen) and use the classic main-screen renderer. The conversation stays in your terminal's native scrollback so `Cmd+f` and tmux copy mode work as usual. Takes precedence over `CLAUDE_CODE_NO_FLICKER` and the [`tui`](/docs/en/settings-reference#tui) setting. You can also switch with `/tui default`. Does not apply to background sessions opened from [agent view](/docs/en/agent-view), which always use fullscreen rendering |
229| `CLAUDE_CODE_DISABLE_ARTIFACT` | Set to `1` to turn off the [Artifact](/docs/en/artifacts) tool, which publishes session output as a private web page on claude.ai. Once you set it, no settings file turns the tool back on. To turn the tool off from a settings file instead, set [`enableArtifact`](/docs/en/settings-reference#enableartifact) to `false`; the deprecated [`disableArtifact`](/docs/en/settings-reference#disableartifact) key also turns it off |
230| `CLAUDE_CODE_DISABLE_ATTACHMENTS` | Set to `1` to disable attachment processing. File mentions with `@` syntax are sent as plain text instead of being expanded into file content |
231| `CLAUDE_CODE_DISABLE_AUTO_MEMORY` | Set to `1` to disable [auto memory](/docs/en/memory#auto-memory). Set to `0` to force auto memory on even when `--bare` mode or [`autoMemoryEnabled: false`](/docs/en/settings-reference#automemoryenabled) would otherwise disable it. When disabled, Claude does not create or load auto memory files |
232| `CLAUDE_CODE_DISABLE_BACKGROUND_TASKS` | Set to `1` to disable all background task functionality, including the `run_in_background` parameter on Bash and subagent tools, auto-backgrounding, and the Ctrl+B shortcut |
233| `CLAUDE_CODE_DISABLE_BEDROCK_CONTENT_TYPE_DEFAULT` | Set to `1` to stop Claude Code from treating an [Amazon Bedrock](/docs/en/amazon-bedrock) streaming response with a missing or empty `Content-Type` header as Amazon Bedrock's binary event stream. By default, Claude Code assumes a gateway dropped the header from an otherwise unmodified response, so it decodes the body and streaming keeps working. Set this only for a gateway that also re-emits the stream as server-sent events; Claude Code then reads the header-less body as server-sent events instead. Requires Claude Code v2.1.239 or later |
234| `CLAUDE_CODE_DISABLE_BEDROCK_CONTENT_TYPE_GUARD` | Set to `1` to skip the check that an [Amazon Bedrock](/docs/en/amazon-bedrock) streaming response carries the `application/vnd.amazon.eventstream` content-type. Without this variable, when a response carries a different content-type, Claude Code fails the request with an error naming that type, which means a [gateway or proxy is transforming the response](/docs/en/amazon-bedrock#streaming-errors-behind-a-gateway-or-proxy). Configure the gateway to forward the `Content-Type` header and body unmodified rather than setting this variable. Requires Claude Code v2.1.208 or later |
235| `CLAUDE_CODE_DISABLE_BG_EXIT_HANDOFF` | Set to `1` to stop a [background session's](/docs/en/agent-view) running background shell commands, dynamic workflows, and, as of v2.1.198, background subagents when the [supervisor](/docs/en/agent-view#the-supervisor-process) stops, restarts, or updates that session's process, instead of handing them to the session's next process. Affects only that handoff: backgrounding a session with `←` or [`/background`](/docs/en/agent-view#from-inside-a-session) still carries in-flight work over, and `CLAUDE_DISABLE_ADOPT` turns off both. Requires Claude Code v2.1.196 or later |
236| `CLAUDE_CODE_DISABLE_BG_SHELL_PRESSURE_REAP` | Set to `1` to stop Claude Code from terminating [background shell commands](/docs/en/interactive-mode#background-bash-commands) when the operating system reports memory pressure. By default, on macOS and Linux, Claude Code terminates a background shell started in the main session on a memory-pressure signal once the session has been idle for 30 minutes and no turn or subagent is running. Windows has no memory-pressure signal, so this variable has no effect there. Requires Claude Code v2.1.193 or later |
237| `CLAUDE_CODE_DISABLE_BUNDLED_SKILLS` | Set to `1` to disable the [skills](/docs/en/skills) and workflows included with Claude Code: bundled skills and workflows are removed entirely, while built-in commands like `/init` stay typable but are hidden from the model. `/doctor` stays typable like the built-in commands; hide it with `DISABLE_DOCTOR_COMMAND` instead. Skills from plugins, `.claude/skills/`, and `.claude/commands/` are unaffected. Equivalent to the [`disableBundledSkills`](/docs/en/settings-reference#disablebundledskills) setting |
238| `CLAUDE_CODE_DISABLE_CFC_PROMPT` | Set to `1` to keep the [Claude in Chrome](/docs/en/chrome) browser tools available while omitting the Chrome section of the system prompt and the `/claude-in-chrome` [bundled skill](/docs/en/skills#bundled-skills). For hosts that embed Claude Code and supply their own browser guidance. Requires Claude Code v2.1.257 or later |
239| `CLAUDE_CODE_DISABLE_CLAUDE_MDS` | Set to `1` to prevent loading any CLAUDE.md memory files into context, including user, project, and auto memory files |
240| `CLAUDE_CODE_DISABLE_CRON` | Set to `1` to disable [scheduled tasks](/docs/en/scheduled-tasks). The `/loop` skill and cron tools become unavailable and any already-scheduled tasks stop firing, including tasks that are already running mid-session |
241| `CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS` | Set to `1` to strip Anthropic-specific `anthropic-beta` request headers and beta tool-schema fields (such as `defer_loading` and `eager_input_streaming`) from API requests. Use this when a proxy gateway rejects requests with errors like "Unexpected value(s) for the `anthropic-beta` header" or "Extra inputs are not permitted". Standard fields (`name`, `description`, `input_schema`, `cache_control`) are preserved. [MCP tool search](/docs/en/mcp#scale-with-mcp-tool-search) is disabled and all MCP tools load upfront, even when you set `ENABLE_TOOL_SEARCH`. On Claude Code v2.1.227 or later, [managed settings](/docs/en/managed-settings) can keep tool search on. [Disable pre-release capabilities](/docs/en/llm-gateway-protocol#disable-pre-release-capabilities) covers where the override applies |
242| `CLAUDE_CODE_DISABLE_EXPLORE_PLAN_AGENTS` | Set to `1` to disable the built-in [Explore and Plan subagents](/docs/en/sub-agents#built-in-subagents). Claude explores with its search tools or the general-purpose subagent instead, and [plan mode](/docs/en/permission-modes#analyze-before-you-edit-with-plan-mode) reads files directly rather than launching Explore and Plan agents. Custom subagents named `Explore` or `Plan` are unaffected. To remove every built-in subagent type in the Agent SDK or non-interactive mode, use `CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS` instead. Requires Claude Code v2.1.198 or later |
243| `CLAUDE_CODE_DISABLE_FAST_MODE` | Set to `1` to disable [fast mode](/docs/en/fast-mode) |
244| `CLAUDE_CODE_DISABLE_FEEDBACK_SURVEY` | Set to `1` to disable the "How is Claude doing?" session quality surveys. Surveys are also disabled when `DISABLE_TELEMETRY`, `DO_NOT_TRACK`, or `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC` is set, unless `CLAUDE_CODE_ENABLE_FEEDBACK_SURVEY_FOR_OTEL` opts back in. To set a sample rate instead of disabling outright, use the [`feedbackSurveyRate`](/docs/en/settings-reference#feedbacksurveyrate) setting. See [Session quality surveys](/docs/en/data-usage#session-quality-surveys) |
245| `CLAUDE_CODE_DISABLE_FILE_CHECKPOINTING` | Set to `1` to disable file [checkpointing](/docs/en/checkpointing). The `/rewind` command will not be able to restore code changes. Overrides the [`fileCheckpointingEnabled`](/docs/en/settings-reference#filecheckpointingenabled) setting |
246| `CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS` | Set to `1` to remove built-in commit and PR workflow instructions and the git status snapshot from Claude's system prompt. Useful when using your own git workflow skills. Takes precedence over the [`includeGitInstructions`](/docs/en/settings-reference#includegitinstructions) setting when set |
247| `CLAUDE_CODE_DISABLE_LEGACY_MODEL_REMAP` | Set to `1` to prevent automatic remapping of Opus 4.0 and 4.1 to the current Opus version on the Anthropic API. Use when you intentionally want to pin an older model. The remap does not run on Amazon Bedrock, Google Cloud's Agent Platform, or Microsoft Foundry |
248| `CLAUDE_CODE_DISABLE_MOUSE` | Set to `1` to disable mouse tracking in [fullscreen rendering](/docs/en/fullscreen). Keyboard scrolling with `PgUp` and `PgDn` still works. Use this to keep your terminal's native copy-on-select behavior |
249| `CLAUDE_CODE_DISABLE_MOUSE_CLICKS` | Set to `1` to disable click, drag, and hover handling in [fullscreen rendering](/docs/en/fullscreen) while keeping mouse-wheel scrolling. Use this when you want wheel scroll to work inside Claude Code but don't want clicks to position the cursor, expand tool output, or open links. `CLAUDE_CODE_DISABLE_MOUSE` takes precedence when both are set. Requires Claude Code v2.1.195 or later |
250| `CLAUDE_CODE_DISABLE_MTLS_RELOAD_ON_STALE_CONNECTION` | Set to `1` to stop Claude Code from re-reading the [mTLS client certificate and key](/docs/en/network-config#mtls-authentication) when an API request fails with a connection-level error, such as a connection reset or a TLS handshake error. With the reload disabled, Claude Code loads rotated files only when it next applies settings or at the next startup. Requires Claude Code v2.1.232 or later |
251| `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC` | Set to any non-empty value, such as `1`, to disable nonessential network traffic: auto-updates, telemetry, error reporting, the `/feedback` command, [Claude-drafted feedback](/docs/en/tools-reference#sendfeedback-tool-behavior), release notes, the [PR and MR status badge](/docs/en/interactive-mode#pr-review-status) checks, [gateway model discovery](/docs/en/llm-gateway-connect#add-gateway-models-to-the-model-picker) refreshes, and availability checks such as the [fast mode](/docs/en/fast-mode#use-fast-mode-behind-proxies-and-llm-gateways) check. It also stops the [background runs of plugin `command` sources](/docs/en/plugin-marketplaces#when-claude-code-re-runs-the-command), which are local commands rather than network traffic, because they can trigger dependency installs. **Setting it to `0` or `false` still disables this traffic**, unlike most on/off variables; unset the variable to allow it again. Also disables feature-flag fetching, which makes [Remote Control](/docs/en/remote-control#requirements) and the other [features that need feature-flag fetching](#features-that-need-feature-flag-fetching) unavailable. Official plugin marketplace auto-install isn't covered; disable it with `CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL` |
252| `CLAUDE_CODE_DISABLE_NONSTREAMING_FALLBACK` | Set to `1` to disable the non-streaming fallback when a streaming request fails mid-stream. Streaming errors propagate to the retry layer instead. Useful when a proxy or gateway causes the fallback to produce duplicate tool execution |
253| `CLAUDE_CODE_DISABLE_NOTIFICATION_PRESENCE_CHECK` | Set to `1` to send the `PushNotification` tool's desktop notification even while you are typing in or focused on the terminal. By default the tool skips both the desktop notification and the [mobile push](/docs/en/remote-control#mobile-push-notifications) when it detects recent keyboard activity or terminal focus. This variable disables only that local check, so the server can still suppress the mobile push when it detects that you are active. Requires Claude Code v2.1.193 or later |
254| `CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL` | Set to `1` to disable automatic registration of the official plugin marketplace. Claude Code reads the variable when it is about to register the marketplace, usually during a machine's first interactive launch. If the variable is set at that point, Claude Code skips the registration permanently. Unsetting the variable later doesn't undo the skip. Run `claude plugin marketplace add anthropics/claude-plugins-official` to register the marketplace at any time |
255| `CLAUDE_CODE_DISABLE_PERMISSION_PROMPT_NOTIFY_HOOKS` | Set to `1` to stop Claude Code from running your [`Notification` hooks for unanswered permission requests](/docs/en/hooks#notification) in sessions where Claude Code sends them to the Agent SDK's `canUseTool` callback, which is how Claude Desktop and the VS Code extension host Claude Code. Has no effect in terminal sessions. Requires Claude Code v2.1.233 or later |
256| `CLAUDE_CODE_DISABLE_POLICY_SKILLS` | Set to `1` to skip loading skills from the system-wide managed skills directory. Useful for container or CI sessions that should not load operator-provisioned skills |
257| `CLAUDE_CODE_DISABLE_TERMINAL_TITLE` | Set to `1` to disable automatic terminal title updates based on conversation context. In Agent SDK and `claude -p` sessions, this also skips the background small/fast-model request that generates the session title |
258| `CLAUDE_CODE_DISABLE_THINKING` | Set to `1` to omit the `thinking` parameter from API requests entirely. This is a compatibility option for proxies and gateways that reject the parameter. The variable's behavior is unchanged from earlier versions; on models that think by default, omitting the parameter means the model may still think. To explicitly disable [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) on the Anthropic API, use `MAX_THINKING_TOKENS=0` instead, which is also ineffective on [Fable models](/docs/en/model-config#extended-thinking) since they can't have thinking turned off. On [third-party providers](/docs/en/third-party-integrations), `0` likewise omits the parameter, so the two variables behave the same there |
259| `CLAUDE_CODE_DISABLE_UNKNOWN_MODEL_WINDOW_ENFORCEMENT` | Set to `1` to skip proactive [auto-compaction](/docs/en/costs#reduce-token-usage) when Claude Code doesn't recognize the model ID, such as an [LLM gateway](/docs/en/llm-gateway) alias. Without this variable, Claude Code compacts at the context window it assumes for the ID. `CLAUDE_CODE_MAX_CONTEXT_TOKENS` can correct the assumed window instead; see [Correct the window for a gateway or custom model ID](/docs/en/model-config#correct-the-window-for-a-gateway-or-custom-model-id) for when each variable applies. Requires Claude Code v2.1.223 or later |
260| `CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL` | Set to `1` to disable virtual scrolling in [fullscreen rendering](/docs/en/fullscreen) and render every message in the transcript. Use this if scrolling in fullscreen mode shows blank regions where messages should appear |
261| `CLAUDE_CODE_DISABLE_WORKFLOWS` | Set to `1` to disable [workflows](/docs/en/workflows#turn-workflows-off). Equivalent to the [`disableWorkflows`](/docs/en/settings-reference#disableworkflows) setting |
262| `CLAUDE_CODE_EFFORT_LEVEL` | Set the effort level for supported models. Values: `low`, `medium`, `high`, `xhigh`, `max`, or `auto` to use the model default. Available levels depend on the model. Takes precedence over `--effort`, `/effort`, and the `modelSettings` and `effortLevel` settings. See [Adjust effort level](/docs/en/model-config#adjust-effort-level) |
263| `CLAUDE_CODE_ENABLE_APPEND_SUBAGENT_PROMPT` | Set to `1` to enable appending extra text to the end of the system prompt of every [subagent](/docs/en/sub-agents) other than a [forked subagent](/docs/en/sub-agents#fork-the-current-conversation). The [`--append-subagent-system-prompt`](/docs/en/cli-reference#cli-flags) flag supplies the appended text and sets this variable automatically, so you don't need to set it yourself. Requires Claude Code v2.1.205 or later |
264| `CLAUDE_CODE_ENABLE_AUTO_MODE` | Accepted for compatibility with older releases and has no effect. Auto mode is available by default on every provider, including Amazon Bedrock, Google Cloud's Agent Platform, Microsoft Foundry, and signed-in [Claude apps gateway](/docs/en/claude-apps-gateway) sessions. In v2.1.158 through v2.1.206, setting this to `1` was required to make [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode) available on those providers |
265| `CLAUDE_CODE_ENABLE_AWAY_SUMMARY` | Override [session recap](/docs/en/interactive-mode#session-recap) availability. Set to `0` to force recaps off regardless of the `/config` toggle. Set to `1` to force recaps on when [`awaySummaryEnabled`](/docs/en/settings-reference#awaysummaryenabled) is `false`. Takes precedence over the setting and `/config` toggle |
266| `CLAUDE_CODE_ENABLE_BACKGROUND_PLUGIN_REFRESH` | Set to `1` to refresh plugin state at turn boundaries in [non-interactive mode](/docs/en/headless) after a background install completes. Off by default because the refresh changes the system prompt mid-session, which invalidates [prompt caching](/docs/en/prompt-caching) for that turn |
267| `CLAUDE_CODE_ENABLE_FEEDBACK_SURVEY_FOR_OTEL` | Set to `1` to route the "How is Claude doing?" session quality survey to your own [OpenTelemetry collector](/docs/en/monitoring-usage) when Anthropic-bound nonessential traffic is blocked. Survey ratings are emitted only as OTEL events to your configured collector. No survey data is sent to Anthropic in this mode. Applies when `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC`, `DISABLE_TELEMETRY`, or `DO_NOT_TRACK` is set, and has no effect otherwise. `CLAUDE_CODE_DISABLE_FEEDBACK_SURVEY` and the organization product feedback policy take precedence |
268| `CLAUDE_CODE_ENABLE_FINE_GRAINED_TOOL_STREAMING` | Controls whether tool call inputs stream from the API as Claude generates them. With this off, a large tool input such as a long file write arrives only after Claude finishes generating it, which can look like it's hanging. Enabled by default on the Anthropic API. On Amazon Bedrock and Google Cloud's Agent Platform, enabled per model where the deployed container supports it. Set to `0` to opt out. Set to `1` to force on when routing through a proxy via `ANTHROPIC_BASE_URL`, `ANTHROPIC_VERTEX_BASE_URL`, or `ANTHROPIC_BEDROCK_BASE_URL`. Off by default on Microsoft Foundry and [gateway](/docs/en/llm-gateway) connections |
269| `CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY` | Set to `1` to populate the `/model` picker from your gateway's `/v1/models` endpoint when `ANTHROPIC_BASE_URL` points at an Anthropic-compatible gateway such as LiteLLM, Kong, or an internal proxy. Off by default because gateways backed by a shared API key would otherwise show every user every model the key can access. Discovered models are still filtered by an [`availableModels`](/docs/en/settings-reference#availablemodels) allowlist the session receives; deliver the list through [MDM or a managed settings file](/docs/en/managed-settings#delivery-mechanisms), since [server-managed delivery is not available on gateway configurations](/docs/en/server-managed-settings#platform-availability) |
270| `CLAUDE_CODE_ENABLE_OPUS_4_7_FAST_MODE` | Removed in v2.1.142, when the [fast mode](/docs/en/fast-mode) default moved from Opus 4.6 to Opus 4.7 |
271| `CLAUDE_CODE_ENABLE_PROMPT_SUGGESTION` | Set to `false` to turn off prompt suggestions, the grayed-out predictions that appear in your prompt input. Takes precedence over the [`promptSuggestionEnabled`](/docs/en/settings-reference#promptsuggestionenabled) setting, which is what the **Prompt suggestions** toggle in `/config` writes. Claude Code also [pauses suggestions while your account is close to or at its usage limit](/docs/en/interactive-mode#when-claude-code-skips-suggestions). Set to `true` to keep them on until you reach the limit. Requires Claude Code v2.1.238 or later. See [Prompt suggestions](/docs/en/interactive-mode#prompt-suggestions) |
272| `CLAUDE_CODE_ENABLE_TASKS` | Selects which task-tracking tools Claude Code provides in [sessions that have them](/docs/en/tools-reference#task-tool-availability). By default, Claude Code provides the Task tools `TaskCreate`, `TaskUpdate`, `TaskGet`, and `TaskList`. Set to `0` to get the legacy `TodoWrite` tool instead. See [Task list](/docs/en/interactive-mode#task-list) |
273| `CLAUDE_CODE_ENABLE_TELEMETRY` | Set to `1` to enable OpenTelemetry data collection for metrics and logging. Required before configuring OTel exporters. See [Monitoring](/docs/en/monitoring-usage) |
274| `CLAUDE_CODE_ENABLE_TODO_TOOLS` | Set to `1` to get the task-tracking tools on the models listed under [Task tool availability](/docs/en/tools-reference#task-tool-availability), where Claude Code otherwise leaves them out. `CLAUDE_CODE_ENABLE_TASKS` still selects the Task tools or `TodoWrite`. Requires Claude Code v2.1.233 or later |
275| `CLAUDE_CODE_EXIT_AFTER_STOP_DELAY` | Time in milliseconds to wait after the query loop becomes idle before automatically exiting. Useful for automated workflows and scripts using SDK mode |
276| `CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS` | Set to `1` to enable [agent teams](/docs/en/agent-teams). Agent teams are experimental and disabled by default |
277| `CLAUDE_CODE_EXTRA_BODY` | JSON object to merge into the top level of every API request body. Useful for passing provider-specific parameters that Claude Code doesn't expose directly. A value exported in your shell also applies to the [background sessions](/docs/en/agent-view) you dispatch with `claude agents` or `--bg`. Before v2.1.206, background sessions ignored a shell-exported value and used whatever copy the background supervisor process inherited |
278| `CLAUDE_CODE_FILE_READ_MAX_OUTPUT_TOKENS` | Override the default token limit for file reads. Useful when you need to read larger files in full |
279| `CLAUDE_CODE_FORCE_SESSION_PERSISTENCE` | Set to `1` to force transcript persistence, prompt history, and `claude agents` registration even when this `claude` was launched from inside another Claude Code session. Use when an inherited `CLAUDE_CODE_CHILD_SESSION` value, for example from a `screen` session or a background launcher first started by Claude Code's Bash tool, causes a genuine top-level session to be misclassified as nested. As of v2.1.178, Claude Code detects the tmux case automatically and ignores the inherited marker, so tmux no longer needs this variable. Also honored on v2.1.169 and earlier; has no effect on v2.1.170 and v2.1.171, where the nested-session detection it overrides was removed |
280| `CLAUDE_CODE_FORCE_STRIKETHROUGH` | Set to `1` to force strikethrough rendering for `~~text~~` in Claude's responses when your terminal supports it but is not auto-detected, such as over SSH without `TERM_PROGRAM` forwarded. Without this, undetected terminals show the literal `~~` markers instead of rendering the text as strikethrough. Requires Claude Code v2.1.186 or later |
281| `CLAUDE_CODE_FORCE_SYNC_OUTPUT` | Set to `1` to force-enable DEC private mode 2026 [synchronized output](https://gist.github.com/christianparpart/d8a62cc1ab659194337d73e399004036) when your terminal supports it but is not auto-detected. Useful for emulators such as Emacs `eat` that implement BSU/ESU but do not reply to the capability probe. Has no effect under tmux. Unlike `CLAUDE_CODE_NO_FLICKER`, which switches to [fullscreen rendering](/docs/en/fullscreen), this doesn't change the renderer |
282| `CLAUDE_CODE_FORK_SUBAGENT` | Controls [fork mode](/docs/en/sub-agents#turn-fork-mode-on-or-off), which lets Claude spawn [forked subagents](/docs/en/sub-agents#fork-the-current-conversation) itself and is on by default in interactive sessions only. Set to `1` to turn it on in `claude -p` and the Agent SDK as well, or `0` to turn it off in every kind of session. You can run `/subtask` whether or not fork mode is on. The interactive default requires Claude Code v2.1.232 or later; on earlier versions, set the variable to `1` to turn fork mode on |
283| `CLAUDE_CODE_FORWARD_SUBAGENT_TEXT` | Set to `1` to emit [subagent](/docs/en/sub-agents) text and thinking blocks in `claude -p --output-format stream-json` output, the same behavior as the [`--forward-subagent-text`](/docs/en/cli-reference#cli-flags) flag. Use the variable when a harness invokes `claude` and can't pass the flag itself. Unlike the flag, which exits with an error outside non-interactive mode with stream-json output, the variable is ignored there so that nested invocations keep working when it's set process-wide. Requires Claude Code v2.1.211 or later |
284| `CLAUDE_CODE_GIT_BASH_PATH` | Windows only: path to the Git Bash executable (`bash.exe`). Use when Git Bash is installed but not in your PATH. If the path doesn't exist or the file isn't named `bash.exe`, `sh.exe`, `bash`, or `sh`, Claude Code ignores the variable and auto-detects Git Bash as if it were unset, logging a warning visible with `--debug`. Before v2.1.219, Claude Code exited at startup when the path didn't exist, and used any existing file as the shell without checking that it was bash or sh. See [Windows setup](/docs/en/setup#set-up-on-windows) |
285| `CLAUDE_CODE_GLOB_HIDDEN` | Set to `false` to exclude dotfiles from results when Claude invokes the [Glob tool](/docs/en/tools-reference#glob-tool-behavior). Included by default. Does not affect `@` file autocomplete, `ls`, Grep, or Read |
286| `CLAUDE_CODE_GLOB_NO_IGNORE` | Set to `false` to make the [Glob tool](/docs/en/tools-reference#glob-tool-behavior) respect `.gitignore` patterns. By default, Glob returns all matching files including gitignored ones. Does not affect `@` file autocomplete, which has its own [`respectGitignore` setting](/docs/en/settings-reference#respectgitignore) |
287| `CLAUDE_CODE_GLOB_TIMEOUT_SECONDS` | Timeout in seconds for Glob tool file discovery. Defaults to 20 seconds on most platforms and 60 seconds on WSL |
288| `CLAUDE_CODE_GOAL_CHECKIN_MINUTES` | How many minutes background work can keep an active goal waiting before Claude Code [asks Claude to check on it](/docs/en/goal#background-work-defers-evaluation). Default `30`. Set `0` to turn check-ins off. Give whole minutes in plain digits, at most `10080`, which is one week. Claude Code treats any other value as unset and uses the default. Requires Claude Code v2.1.234 or later |
289| `CLAUDE_CODE_HIDE_CWD` | Set to `1` to hide the working directory in the startup logo. Useful for screenshares or recordings where the path exposes your OS username |
290| `CLAUDE_CODE_IDE_HOST_OVERRIDE` | Override the host address used to connect to the IDE extension. By default Claude Code auto-detects the correct address, including WSL-to-Windows routing |
291| `CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL` | Set to `1` to skip auto-installation of IDE extensions. Equivalent to setting [`autoInstallIdeExtension`](/docs/en/settings-reference#autoinstallideextension) to `false` |
292| `CLAUDE_CODE_IDE_SKIP_VALID_CHECK` | Set to `1` to skip validation of IDE lockfile entries during connection. Use when auto-connect fails to find your IDE despite it running |
293| `CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS` | How many [subagents](/docs/en/sub-agents#concurrent-subagent-limit) can be running in one session before the Agent tool refuses to spawn another (default: 20). Accepts a positive whole number in plain digits; anything else is ignored, so the variable can adjust the cap but can't disable it. Requires Claude Code v2.1.217 or later |
294| `CLAUDE_CODE_MAX_CONTEXT_TOKENS` | Override the context window size Claude Code assumes for the active model. As of v2.1.193, how it applies depends on how Claude Code resolves the model ID; see [Correct the window for a gateway or custom model ID](/docs/en/model-config#correct-the-window-for-a-gateway-or-custom-model-id). Use this when routing to a model through `ANTHROPIC_BASE_URL` whose context window does not match the built-in size for its name |
295| `CLAUDE_CODE_MAX_OUTPUT_TOKENS` | Set the maximum number of output tokens for most requests. Defaults and caps vary by model; see [max output tokens](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison). Claude Code defaults to 32000 for model IDs it doesn't recognize, such as gateway-specific names, and lowers values above a model's cap to the cap. Increasing this value reduces the effective context window available before [auto-compaction](/docs/en/costs#reduce-token-usage) triggers |
296| `CLAUDE_CODE_MAX_RETRIES` | Override the number of times to retry failed API requests (default: 10). Capped at 15 as of v2.1.186; as of v2.1.199, `CLAUDE_CODE_RETRY_WATCHDOG` raises the default and removes the cap. For unattended sessions that need to wait through longer outages, set `CLAUDE_CODE_RETRY_WATCHDOG` instead |
297| `CLAUDE_CODE_MAX_SUBAGENTS_PER_SESSION` | Removed in v2.1.224 and now a no-op. Previously capped the total number of [subagents](/docs/en/sub-agents) Claude could spawn with the Agent tool in one session (default: 200); spawning past the cap failed with `Subagent spawn limit reached`. The [concurrent subagent limit](/docs/en/sub-agents#concurrent-subagent-limit) and the [depth limit](/docs/en/sub-agents#let-subagents-spawn-their-own-subagents) still apply |
298| `CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH` | Number of [subagent layers](/docs/en/sub-agents#let-subagents-spawn-their-own-subagents) allowed below the main conversation (default: 3). At the default, subagents can spawn their own subagents, and a subagent at the third layer can't spawn further; set `1` to turn nesting off. In v2.1.217 through v2.1.218, the default was 1, so a subagent couldn't spawn its own unless you raised the limit; v2.1.219 raised the default to 3. Accepts a positive whole number in plain digits; anything else is ignored, so the limit can be adjusted but not removed. Requires Claude Code v2.1.217 or later |
299| `CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY` | Maximum number of read-only tools and subagents that can execute in parallel (default: 10). Higher values increase parallelism but consume more resources |
300| `CLAUDE_CODE_MAX_TURNS` | Cap the number of agentic turns when no explicit limit is passed. Equivalent to passing [`--max-turns`](/docs/en/cli-reference#cli-flags), which takes precedence when both are set. A value that is not a positive integer is rejected at startup with an error rather than treated as no cap |
301| `CLAUDE_CODE_MAX_WEB_SEARCHES_PER_SESSION` | Cap on the total number of [WebSearch](/docs/en/tools-reference#websearch-tool-behavior) calls one session can make (default: 200). When Claude reaches the cap, further WebSearch calls return a notice telling it to continue with the information it already gathered. Accepts a positive whole number with no upper bound. Anything else is ignored and the default applies, so the cap can be raised but not turned off. Requires Claude Code v2.1.212 or later |
302| `CLAUDE_CODE_MCP_ALLOWLIST_ENV` | Set to `1` to spawn stdio MCP servers with only a safe baseline environment plus the server's configured `env`, instead of inheriting your shell environment |
303| `CLAUDE_CODE_MCP_AUTO_BACKGROUND_MS` | Elapsed time in milliseconds before a still-running MCP tool call [moves to a background task](/docs/en/mcp#automatic-backgrounding-of-long-tool-calls) (default: 120000, or 2 minutes). Set to `0` to turn automatic backgrounding off. Requires Claude Code v2.1.212 or later |
304| `CLAUDE_CODE_MCP_TOOL_IDLE_TIMEOUT` | Idle timeout in milliseconds for MCP tool calls. When a stdio, HTTP, SSE, WebSocket, or [claude.ai connector](/docs/en/mcp#use-mcp-servers-from-claude-ai) MCP server sends no response and no progress notification for this long, the tool call aborts with an error instead of waiting for the overall `MCP_TOOL_TIMEOUT`. Overrides the per-transport defaults of 300000 (5 minutes) for network servers and 1800000 (30 minutes) for stdio servers. Set to `0` to disable the idle check. Values below 1000 are raised to one second, and the value is capped at the effective `MCP_TOOL_TIMEOUT`. A per-server `timeout` in `.mcp.json` of at least 1000 raises that server's idle window to at least the `timeout` value. Doesn't apply to IDE servers or SDK in-process servers. Requires Claude Code v2.1.187 or later. Before v2.1.203, stdio servers were exempt from the idle timeout |
305| `CLAUDE_CODE_MESSAGING_SOCKET` | Set by Claude Code, not by you: in sessions that bind an [inbox socket](/docs/en/cross-session-messaging#the-sessions-inbox-socket), Claude Code exports that socket's path to hooks and Bash commands when it binds the socket. In a session that starts with messaging on, Claude Code binds the socket before any hook runs. Other sessions on the machine deliver messages to this path. Each session exports its own socket rather than one inherited from a parent, and messages arriving on it go through the session's [inbound controls](/docs/en/cross-session-messaging#control-inbound-messages). Settings `env` blocks can't set it. Requires Claude Code v2.1.224 or later |
306| `CLAUDE_CODE_MESSAGING_TOKEN` | Set by Claude Code, not by you: in sessions that bind an [inbox socket](/docs/en/cross-session-messaging#the-sessions-inbox-socket), Claude Code exports this per-session token to hooks and Bash commands alongside `CLAUDE_CODE_MESSAGING_SOCKET`. A script posting to the socket can send `{"type":"auth","token":"<token>"}` as its first line to prove it belongs to the session. On native Windows, Claude Code requires this line and closes any connection that doesn't open with a valid one. The [own-child rules](/docs/en/cross-session-messaging#the-sessions-inbox-socket) say when Claude Code consults the token. Each session exports its own token, never one inherited from a parent session. Settings `env` blocks can't set it. Requires Claude Code v2.1.228 or later |
307| `CLAUDE_CODE_NATIVE_CURSOR` | Set to `1` to show the terminal's own cursor at the input caret instead of a drawn block. The cursor respects the terminal's blink, shape, and focus settings |
308| `CLAUDE_CODE_NEW_INIT` | Set to `1` to make `/init` run an interactive setup flow. The flow asks which files to generate, including CLAUDE.md, skills, and hooks, before exploring the codebase and writing them. Without this variable, `/init` generates a CLAUDE.md automatically without prompting |
309| `CLAUDE_CODE_NO_FLICKER` | Set to `1` to enable [fullscreen rendering](/docs/en/fullscreen), a research preview that reduces flicker and keeps memory flat in long conversations. Overrides the [`tui`](/docs/en/settings-reference#tui) setting; you can also switch with `/tui fullscreen` |
310| `CLAUDE_CODE_OAUTH_REFRESH_TOKEN` | OAuth refresh token for Claude.ai authentication. When set, `claude auth login` exchanges this token directly instead of opening a browser. Requires `CLAUDE_CODE_OAUTH_SCOPES`. Useful for provisioning authentication in automated environments |
311| `CLAUDE_CODE_OAUTH_SCOPES` | Space-separated OAuth scopes the refresh token was issued with, such as `"user:profile user:inference user:sessions:claude_code"`. Required when `CLAUDE_CODE_OAUTH_REFRESH_TOKEN` is set |
312| `CLAUDE_CODE_OAUTH_TOKEN` | OAuth access token for claude.ai authentication. Alternative to `/login` for SDK and automated environments. Takes precedence over keychain-stored credentials. Generate one with [`claude setup-token`](/docs/en/authentication#generate-a-long-lived-token). Unless you run [`/login`](/docs/en/authentication#authentication-precedence), Claude Code uses the token you set for the whole session. To replace an expired token, generate a new one and restart |
313| `CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE` | Removed in v2.1.160 and now a no-op. Previously pinned [fast mode](/docs/en/fast-mode) to Claude Opus 4.6 instead of the current default. Opus 4.6 no longer supports fast mode |
314| `CLAUDE_CODE_OTEL_CONTENT_MAX_LENGTH` | Maximum length of content-bearing OpenTelemetry attributes (model responses, tool content, system prompts, raw API bodies), truncation marker included, in UTF-16 code units (default: 61440, i.e. 60 KB). Raise it only if your telemetry backend accepts attribute values larger than 64 KB, or lower it to cut telemetry volume. Requires Claude Code v2.1.214 or later. See [Monitoring](/docs/en/monitoring-usage) |
315| `CLAUDE_CODE_OTEL_DIAG_STDERR` | Set to `1` to write OpenTelemetry exporter diagnostic errors to stderr. By default these errors only appear with `--debug`, so a misconfigured exporter such as a Prometheus port collision otherwise fails silently. Requires Claude Code v2.1.179 or later. See [Monitoring](/docs/en/monitoring-usage) |
316| `CLAUDE_CODE_OTEL_FLUSH_TIMEOUT_MS` | Timeout in milliseconds for flushing pending OpenTelemetry spans (default: 5000). See [Monitoring](/docs/en/monitoring-usage) |
317| `CLAUDE_CODE_OTEL_HEADERS_HELPER_DEBOUNCE_MS` | Interval for refreshing dynamic OpenTelemetry headers in milliseconds (default: 1740000 / 29 minutes). See [Dynamic headers](/docs/en/monitoring-usage#dynamic-headers) |
318| `CLAUDE_CODE_OTEL_SHUTDOWN_TIMEOUT_MS` | Timeout in milliseconds for the OpenTelemetry exporter to finish on shutdown (default: 2000). Increase if metrics are dropped at exit. See [Monitoring](/docs/en/monitoring-usage) |
319| `CLAUDE_CODE_PACKAGE_MANAGER_AUTO_UPDATE` | Set to `1` to let Claude Code run your package manager's upgrade command in the background when a new version is available. Applies to Homebrew and WinGet installations. Other package managers continue to show the upgrade command without running it. See [Auto updates](/docs/en/setup#auto-updates) |
320| `CLAUDE_CODE_PERFORCE_MODE` | Set to `1` to enable Perforce-aware write protection. When set, Edit, Write, and NotebookEdit fail with a `p4 edit <file>` hint if the target file lacks the owner-write bit, which Perforce clears on synced files until `p4 edit` opens them. This prevents Claude Code from bypassing Perforce change tracking |
321| `CLAUDE_CODE_PLUGIN_CACHE_DIR` | Override the plugins root directory. Despite the name, this sets the parent directory, not the cache itself: marketplaces and the plugin cache live in subdirectories under this path. Defaults to `~/.claude/plugins` |
322| `CLAUDE_CODE_PLUGIN_GIT_TIMEOUT_MS` | Timeout in milliseconds for git operations when installing or updating plugins (default: 120
130| Variable | Purpose |
131| :------------------------------------------------------ | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
132| `ANTHROPIC_API_KEY` | API key sent as `X-Api-Key` header. When set, this key is used instead of your Claude Pro, Max, Team, or Enterprise subscription even if you are logged in. In non-interactive mode (`-p`), the key is always used when present. In interactive mode, you are prompted to approve the key once before it overrides your subscription. To use your subscription instead, run `unset ANTHROPIC_API_KEY` |
133| `ANTHROPIC_AUTH_TOKEN` | Custom value for the `Authorization` header (the value you set here will be prefixed with `Bearer `) |
134| `ANTHROPIC_AWS_API_KEY` | Workspace API key for [Claude Platform on AWS](/docs/en/claude-platform-on-aws), generated in the AWS Console. Sent as `x-api-key` and takes precedence over AWS SigV4 |
135| `ANTHROPIC_AWS_BASE_URL` | Override the [Claude Platform on AWS](/docs/en/claude-platform-on-aws) endpoint URL. Use for custom regions or when routing through an [LLM gateway](/docs/en/llm-gateway). Defaults to `https://aws-external-anthropic.{region}.api.aws`. Claude Code resolves the region with the [same precedence as on Amazon Bedrock](/docs/en/amazon-bedrock#3-configure-claude-code) |
136| `ANTHROPIC_AWS_WORKSPACE_ID` | Required for [Claude Platform on AWS](/docs/en/claude-platform-on-aws). Sent on every request as the `anthropic-workspace-id` header |
137| `ANTHROPIC_BASE_URL` | Override the API endpoint to route requests through a proxy or gateway. When set to a non-first-party host, [MCP tool search](/docs/en/mcp#scale-with-mcp-tool-search) is disabled by default. Set `ENABLE_TOOL_SEARCH=true` if your proxy forwards `tool_reference` blocks. As of v2.1.196, [Remote Control](/docs/en/remote-control#requirements) is disabled when this points at a host other than `api.anthropic.com`, matching its behavior on Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry |
138| `ANTHROPIC_BEDROCK_BASE_URL` | Override the Amazon Bedrock endpoint URL. Use for custom Amazon Bedrock endpoints or when routing through an [LLM gateway](/docs/en/llm-gateway). See [Amazon Bedrock](/docs/en/amazon-bedrock) |
139| `ANTHROPIC_BEDROCK_MANTLE_BASE_URL` | Override the Amazon Bedrock Mantle endpoint URL. See [Mantle endpoint](/docs/en/amazon-bedrock#use-the-mantle-endpoint) |
140| `ANTHROPIC_BEDROCK_REGION_PREFIX` | Cross-region inference profile prefix (`us`, `eu`, `apac`, `jp`, `au`, or `global`) Claude Code tries first instead of the one derived from the AWS region. Ignored in AWS GovCloud regions. Requires Claude Code v2.1.224 or later. See [Amazon Bedrock](/docs/en/amazon-bedrock#cross-region-inference-profile-prefixes) |
141| `ANTHROPIC_BEDROCK_SERVICE_TIER` | Amazon Bedrock [service tier](https://docs.aws.amazon.com/bedrock/latest/userguide/service-tiers-inference.html) (`default`, `flex`, or `priority`). Sent as the `X-Amzn-Bedrock-Service-Tier` header. See [Amazon Bedrock](/docs/en/amazon-bedrock#service-tiers) |
142| `ANTHROPIC_BETAS` | Comma-separated list of additional `anthropic-beta` header values to include in API requests. Claude Code already sends the beta headers it needs; use this to opt into an [Anthropic API beta](https://platform.claude.com/docs/en/api/beta-headers) before Claude Code adds native support. Unlike the [`--betas` flag](/docs/en/cli-reference#cli-flags), which requires API key authentication, this variable works with all auth methods including Claude.ai subscription |
143| `ANTHROPIC_CUSTOM_HEADERS` | Custom headers to add to requests (`Name: Value` format, newline-separated for multiple headers). If a name or value contains a character an HTTP header can't carry, such as a curly quote or a zero-width space, the request fails with an error that identifies the pair by position. Requires Claude Code v2.1.227 or later. [Invalid request header value](/docs/en/errors#invalid-request-header-value) lists the exact character set and where the check runs. A value that sets a credential, org or tenant, routing, or API-behavior header, such as `Authorization` or `Host`, counts as a [setting that needs approval](/docs/en/server-managed-settings#environment-variables-and-the-approval-dialog) when server-managed settings deliver it. From project or local settings, such a value follows the [rules for when `env` values apply](/docs/en/settings-reference#when-claude-code-applies-env-values) |
144| `ANTHROPIC_CUSTOM_MODEL_OPTION` | Model ID to add as a custom entry in the `/model` picker. Use this to make a non-standard or gateway-specific model selectable without replacing built-in aliases. See [Model configuration](/docs/en/model-config#add-a-custom-model-option) |
145| `ANTHROPIC_CUSTOM_MODEL_OPTION_DESCRIPTION` | Display description for the custom model entry in the `/model` picker. Defaults to `Custom model (<model-id>)` when not set |
146| `ANTHROPIC_CUSTOM_MODEL_OPTION_NAME` | Display name for the custom model entry in the `/model` picker. Defaults to the model ID when not set |
147| `ANTHROPIC_CUSTOM_MODEL_OPTION_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the custom model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
148| `ANTHROPIC_DEFAULT_FABLE_MODEL` | Model ID that the `fable` alias resolves to, and the ID Claude Code recognizes as a Fable model for [automatic model fallback](/docs/en/model-config#automatic-model-fallback) on third-party providers. See [Model configuration](/docs/en/model-config#environment-variables) |
149| `ANTHROPIC_DEFAULT_FABLE_MODEL_DESCRIPTION` | Display description for the pinned Fable model in the `/model` picker. Defaults to `Custom Fable model` when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
150| `ANTHROPIC_DEFAULT_FABLE_MODEL_NAME` | Display name for the pinned Fable model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
151| `ANTHROPIC_DEFAULT_FABLE_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Fable model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
152| `ANTHROPIC_DEFAULT_HAIKU_MODEL` | Model ID that the `haiku` alias resolves to, also used for [background functionality](/docs/en/costs#background-token-usage). See [Model configuration](/docs/en/model-config#environment-variables) |
153| `ANTHROPIC_DEFAULT_HAIKU_MODEL_DESCRIPTION` | Display description for the pinned Haiku model in the `/model` picker. Defaults to `Custom Haiku model` when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
154| `ANTHROPIC_DEFAULT_HAIKU_MODEL_NAME` | Display name for the pinned Haiku model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
155| `ANTHROPIC_DEFAULT_HAIKU_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Haiku model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
156| `ANTHROPIC_DEFAULT_MODEL` | Model that new sessions start on by default. Requires Claude Code v2.1.236 or later. See [Set a default model for new sessions](/docs/en/model-config#set-a-default-model-for-new-sessions) |
157| `ANTHROPIC_DEFAULT_OPUS_MODEL` | Model ID that the `opus` alias resolves to, and that `opusplan` uses while Plan Mode is active. See [Model configuration](/docs/en/model-config#environment-variables) |
158| `ANTHROPIC_DEFAULT_OPUS_MODEL_DESCRIPTION` | Display description for the pinned Opus model in the `/model` picker. When not set, defaults to `Custom Opus model`, or `Custom Opus model (1M context)` if the pinned model ID has the `[1m]` suffix and `CLAUDE_CODE_DISABLE_1M_CONTEXT` isn't turned on. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
159| `ANTHROPIC_DEFAULT_OPUS_MODEL_NAME` | Display name for the pinned Opus model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
160| `ANTHROPIC_DEFAULT_OPUS_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Opus model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
161| `ANTHROPIC_DEFAULT_SONNET_MODEL` | Model ID that the `sonnet` alias resolves to, and that `opusplan` uses when Plan Mode is not active. See [Model configuration](/docs/en/model-config#environment-variables) |
162| `ANTHROPIC_DEFAULT_SONNET_MODEL_DESCRIPTION` | Display description for the pinned Sonnet model in the `/model` picker. When not set, defaults to `Custom Sonnet model`, or `Custom Sonnet model (1M context)` if the pinned model ID has the `[1m]` suffix and `CLAUDE_CODE_DISABLE_1M_CONTEXT` isn't turned on. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
163| `ANTHROPIC_DEFAULT_SONNET_MODEL_NAME` | Display name for the pinned Sonnet model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
164| `ANTHROPIC_DEFAULT_SONNET_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Sonnet model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
165| `ANTHROPIC_FEDERATION_RULE_ID` | Federation rule ID for [Workload Identity Federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). When you set it together with `ANTHROPIC_ORGANIZATION_ID`, Claude Code selects federation credentials, which rank above your `/login` credential. See [authentication precedence](/docs/en/authentication#authentication-precedence) |
166| `ANTHROPIC_FOUNDRY_API_KEY` | API key for Microsoft Foundry authentication (see [Microsoft Foundry](/docs/en/microsoft-foundry)) |
167| `ANTHROPIC_FOUNDRY_AUTH_TOKEN` | Bearer token for Microsoft Foundry authentication, such as a Microsoft Entra access token. Claude Code sends it as the `Authorization: Bearer` header. Takes precedence over `ANTHROPIC_FOUNDRY_API_KEY` and over the Azure default credential chain. See [Microsoft Foundry](/docs/en/microsoft-foundry). Requires Claude Code v2.1.203 or later |
168| `ANTHROPIC_FOUNDRY_BASE_URL` | Full base URL for the Microsoft Foundry resource (for example, `https://my-resource.services.ai.azure.com/anthropic`). Alternative to `ANTHROPIC_FOUNDRY_RESOURCE` (see [Microsoft Foundry](/docs/en/microsoft-foundry)) |
169| `ANTHROPIC_FOUNDRY_RESOURCE` | Microsoft Foundry resource name (for example, `my-resource`). Required if `ANTHROPIC_FOUNDRY_BASE_URL` is not set (see [Microsoft Foundry](/docs/en/microsoft-foundry)) |
170| `ANTHROPIC_MODEL` | Name of the model setting to use (see [Model Configuration](/docs/en/model-config#environment-variables)) |
171| `ANTHROPIC_ORGANIZATION_ID` | Organization ID for [Workload Identity Federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). Set it together with `ANTHROPIC_FEDERATION_RULE_ID`. See [authentication precedence](/docs/en/authentication#authentication-precedence) |
172| `ANTHROPIC_PROFILE` | Name of the Anthropic profile to authenticate with, such as one created by [`ant auth login`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/authentication) or by [signing in to a Console account without an API key](/docs/en/authentication#sign-in-without-an-api-key). See [authentication precedence](/docs/en/authentication#authentication-precedence) |
173| `ANTHROPIC_SMALL_FAST_MODEL` | \[DEPRECATED] Name of [Haiku-class model for background tasks](/docs/en/costs) |
174| `ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION` | Override AWS region for the Haiku-class model when using Amazon Bedrock or Amazon Bedrock Mantle. On Amazon Bedrock, this only takes effect when `ANTHROPIC_DEFAULT_HAIKU_MODEL` or the deprecated `ANTHROPIC_SMALL_FAST_MODEL` is also set, since Amazon Bedrock otherwise runs background tasks on the [default Sonnet model or the primary model](/docs/en/amazon-bedrock#4-pin-model-versions) in the session region |
175| `ANTHROPIC_VERTEX_BASE_URL` | Override Google Cloud's Agent Platform endpoint URL. Use for custom Google Cloud's Agent Platform endpoints or when routing through an [LLM gateway](/docs/en/llm-gateway). See [Google Cloud's Agent Platform](/docs/en/google-vertex-ai) |
176| `ANTHROPIC_VERTEX_PROJECT_ID` | GCP project ID for Google Cloud's Agent Platform requests. Overridden by `GCLOUD_PROJECT`, `GOOGLE_CLOUD_PROJECT`, or the project in your `GOOGLE_APPLICATION_CREDENTIALS` credential file. See [Google Cloud's Agent Platform](/docs/en/google-vertex-ai) |
177| `ANTHROPIC_WORKSPACE_ID` | Workspace ID for [workload identity federation](https://platform.claude.com/docs/en/manage-claude/workload-identity-federation). Set this when your federation rule is scoped to more than one workspace so the token exchange knows which workspace to target |
178| `API_FORCE_IDLE_TIMEOUT` | Override the 5-minute body idle timeout that aborts a streaming model response when no bytes arrive. Set to `0` to turn the timeout off, for example when a slow [gateway](/docs/en/llm-gateway) or local model pauses longer than 5 minutes between chunks, or `1` to keep it on for every provider. When unset, the timeout is active on providers other than the direct Anthropic API and [Claude Platform on AWS](/docs/en/claude-platform-on-aws). The [stream watchdogs](/docs/en/network-config#streaming-idle-watchdogs) run independently of it and abort a long silent pause even when you set `0` here. Requires Claude Code v2.1.169 or later |
179| `API_TIMEOUT_MS` | Timeout for API requests in milliseconds (default: 600000, or 10 minutes; maximum: 2147483647). Increase this when requests time out on slow networks or when routing through a proxy. Values above the maximum overflow the underlying timer and cause requests to fail immediately |
180| `AWS_BEARER_TOKEN_BEDROCK` | Amazon Bedrock API key for authentication (see [Amazon Bedrock API keys](https://aws.amazon.com/blogs/machine-learning/accelerate-ai-development-with-amazon-bedrock-api-keys/)) |
181| `BASH_DEFAULT_TIMEOUT_MS` | Default timeout for long-running bash commands (default: 120000, or 2 minutes) |
182| `BASH_MAX_OUTPUT_LENGTH` | Maximum number of characters of bash output that Claude Code reads back into a command's result (default: 30000; maximum: 150000). If you set the [`bashOutputMaxChars`](/docs/en/settings-reference#bashoutputmaxchars) setting, Claude Code ignores this variable. See [Output limits](/docs/en/tools-reference#output-limits) |
183| `BASH_MAX_TIMEOUT_MS` | Maximum timeout the model can set for long-running bash commands (default: 600000, or 10 minutes). The effective ceiling is the larger of this and `BASH_DEFAULT_TIMEOUT_MS` |
184| `BETA_TRACING_ENDPOINT` | OTLP endpoint for [detailed beta tracing](/docs/en/monitoring-usage#traces-beta): with `ENABLE_BETA_TRACING_DETAILED=1`, logs and traces go there instead of to the configured exporters. Set it in your shell, user settings, or managed settings. Ignored in [project and local settings](/docs/en/settings-reference#variables-claude-code-ignores-in-env) |
185| `CCR_FORCE_BUNDLE` | Set to `1` to force [`claude --cloud`](/docs/en/claude-code-on-the-web#send-local-repositories-without-github) to bundle and upload your local repository even when GitHub access is available |
186| `CLAUDECODE` | Set to `1` in subprocesses Claude Code spawns (Bash and PowerShell tools, tmux sessions, [hook](/docs/en/hooks) commands, [status line](/docs/en/statusline) commands, stdio [MCP server](/docs/en/mcp) subprocesses). IDE extensions also set this in their integrated terminals. Use to detect when a script is running inside a subprocess spawned by Claude Code. To check whether the current process was spawned directly by a tool call or hook, rather than inside a stdio MCP server that Claude Code started, use `CLAUDE_CODE_CHILD_SESSION` instead |
187| `CLAUDE_AFK_COUNTDOWN_MS` | How many milliseconds before auto-continue the on-screen countdown appears on an unanswered [`AskUserQuestion`](/docs/en/tools-reference) dialog. Default `20000` (20 seconds), capped at the auto-continue timeout. Has no effect unless auto-continue is on; see the [`askUserQuestionTimeout`](/docs/en/settings-reference#askuserquestiontimeout) setting and `CLAUDE_AFK_TIMEOUT_MS`. Requires Claude Code v2.1.198 or later |
188| `CLAUDE_AFK_TIMEOUT_MS` | How many milliseconds of idle time before an unanswered [`AskUserQuestion`](/docs/en/tools-reference) dialog auto-continues without you. Auto-continue is off by default; opt in with the [`askUserQuestionTimeout`](/docs/en/settings-reference#askuserquestiontimeout) setting. This variable is an override for demos and automated tests: when set, it takes precedence over that setting and turns auto-continue on even when the setting is unset or `never`. Setting `0` doesn't turn the timeout off; it closes the dialog immediately. In v2.1.198 and v2.1.199, auto-continue was on by default with a `60000` (60 seconds) timeout. Requires Claude Code v2.1.198 or later |
189| `CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS` | Set to `1` to disable all built-in [subagent](/docs/en/sub-agents) types such as Explore and Plan. Only applies in non-interactive mode (the `-p` flag). Useful for SDK users who want a blank slate. This also removes `general-purpose`, the subagent Claude Code runs when an Agent tool call omits `subagent_type`. Such a call then fails with [`subagent_type is required`](/docs/en/errors#subagent-type-is-required) |
190| `CLAUDE_AGENT_SDK_MCP_NO_PREFIX` | Set to `1` to skip the `mcp__<server>__` prefix on tool names from SDK-created MCP servers. Tools use their original names. SDK usage only |
191| `CLAUDE_ASYNC_AGENT_STALL_TIMEOUT_MS` | Stall timeout in milliseconds for subagents. Default `600000` (10 minutes); if you raise `CLAUDE_STREAM_IDLE_TIMEOUT_MS` while the stream watchdog is on, the default rises with it, as [Handle slow or stalled API responses](/docs/en/agent-sdk/typescript#handle-slow-or-stalled-api-responses) describes. The timer resets on each streaming progress event; if no progress arrives within the window, Claude Code aborts the subagent and reports the stall to the parent |
192| `CLAUDE_AUTOCOMPACT_PCT_OVERRIDE` | Set the percentage (1-100) of the auto-compact window at which auto-compaction triggers. Use lower values like `50` to compact earlier; the variable can't raise the threshold, so values above the default percentage are ignored. It applies only in sessions that [compact before the model's context limit](/docs/en/model-config#context-window-and-auto-compaction). Applies to both main conversations and subagents |
193| `CLAUDE_AUTO_BACKGROUND_TASKS` | Set to `1` to force-enable automatic backgrounding of long-running agent tasks. When enabled, subagents are moved to the background after running for approximately two minutes. Also enables [automatic backgrounding of long MCP tool calls](/docs/en/mcp#automatic-backgrounding-of-long-tool-calls) in non-interactive mode on Claude Code v2.1.212 or later |
194| `CLAUDE_AX_PREPARK_MS` | In [screen reader mode](/docs/en/accessibility#what-your-screen-reader-hears), how many milliseconds Claude Code waits, with the cursor at the start of the line, before it writes a new or changed line. Default `50`. Set `0` to write immediately. Claude Code caps the wait at `5000`. Requires Claude Code v2.1.233 or later |
195| `CLAUDE_AX_SCREEN_READER` | Set to `1` to render screen-reader friendly output: flat text without decorative borders or animations. Set to `0` to force screen-reader mode off even when [`axScreenReader`](/docs/en/settings-reference#axscreenreader) is `true`. The [`--ax-screen-reader`](/docs/en/cli-reference#cli-flags) flag takes precedence. Requires Claude Code v2.1.181 or later |
196| `CLAUDE_AX_STARTUP_QUIET_MS` | In [screen reader mode](/docs/en/accessibility), how many milliseconds Claude Code holds the first interface render after the startup confirmation line, so your screen reader can speak the line in full before new output interrupts it. Default `3000`. Set `0` to render immediately. Claude Code caps the hold at `600000` (10 minutes). Your first keystroke ends the hold early. Requires Claude Code v2.1.217 or later |
197| `CLAUDE_BASH_MAINTAIN_PROJECT_WORKING_DIR` | Return to the original working directory after each Bash or PowerShell command in the main session |
198| `CLAUDE_BYTE_STREAM_IDLE_TIMEOUT_MS` | Timeout in milliseconds for the byte-level streaming idle watchdog; when set, it takes precedence over `CLAUDE_STREAM_IDLE_TIMEOUT_MS` for that watchdog and leaves the event-level watchdog unchanged. Claude Code clamps this variable to between 10 seconds and 30 minutes. Requires Claude Code v2.1.210 or later |
199| `CLAUDE_CLIENT_PRESENCE_FILE` | Path to a file that an external tool, such as a screen-lock listener, creates when you unlock your screen and deletes when you lock it. While the file exists, Claude Code skips [Remote Control mobile push notifications](/docs/en/remote-control#mobile-push-notifications), so you stop getting pushes while you are actively using the computer. When the file is absent or unreadable, notifications are sent as normal. Claude Code checks the file once per push-triggering event rather than polling it. Requires Claude Code v2.1.181 or later |
200| `CLAUDE_CODE_ACCESSIBILITY` | Set to `1` to keep the native terminal cursor visible and disable the inverted-text cursor indicator. Allows screen magnifiers like macOS Zoom to track cursor position |
201| `CLAUDE_CODE_ADDITIONAL_DIRECTORIES_CLAUDE_MD` | Set to `1` to load memory files from directories specified with `--add-dir`. Loads `CLAUDE.md`, `.claude/CLAUDE.md`, `.claude/rules/*.md`, and `CLAUDE.local.md`. By default, additional directories do not load memory files |
202| `CLAUDE_CODE_ALT_SCREEN_FULL_REPAINT` | Set to `1` to repaint the entire screen on every frame in [fullscreen rendering](/docs/en/fullscreen) instead of sending incremental updates. Use this if fullscreen mode shows stale or misplaced text fragments. Claude Code enables this automatically for background sessions and [agent view](/docs/en/agent-view) on Windows |
203| `CLAUDE_CODE_ALWAYS_ENABLE_EFFORT` | Set to `1` to send the [effort](/docs/en/model-config#adjust-effort-level) parameter with every request, even when Claude Code does not recognize the model ID as effort-capable. Use this when routing through an [LLM gateway](/docs/en/llm-gateway) or third-party provider that serves models under custom identifiers. Models that reject the effort parameter at the API, including Claude 3 models, Sonnet 4.0 and 4.5, Opus 4.0 and 4.1, and Haiku 4.5, are still excluded so requests do not fail |
204| `CLAUDE_CODE_API_KEY_HELPER_TTL_MS` | Interval in milliseconds at which credentials should be refreshed (when using [`apiKeyHelper`](/docs/en/settings-reference#apikeyhelper)) |
205| `CLAUDE_CODE_ARTIFACT_AUTO_OPEN` | Set to `0` to stop Claude Code from opening the browser automatically when a new [artifact](/docs/en/artifacts) is published. Republishing an existing artifact does not open the browser regardless of this setting |
206| `CLAUDE_CODE_ARTIFACT_COMMENTS` | Set to `0` to stop Claude reading and replying to [comments on an artifact](/docs/en/artifacts#collect-comments-on-an-artifact). Has no effect when `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC` has [turned artifacts off](/docs/en/artifacts#availability). Requires Claude Code v2.1.221 or later |
207| `CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT` | Set to `0` to stop Claude [replying on its own to comments sent to it](/docs/en/artifacts#let-claude-reply-to-comments-on-its-own). Requires Claude Code v2.1.228 or later |
208| `CLAUDE_CODE_ATTRIBUTION_HEADER` | Set to `0` to omit the [attribution block](/docs/en/llm-gateway-protocol#system-prompt-attribution-block), which carries the client version and a prompt fingerprint, from the start of the system prompt. Caching on a direct connection to the Anthropic API is unaffected either way. In some direct-connection setups, Claude Code keeps the block on [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode) classifier requests even when you set `0`. In [System prompt attribution block](/docs/en/llm-gateway-protocol#system-prompt-attribution-block), check which connections and credentials this covers. Before v2.1.181 the block included a per-request token on custom base URLs and Microsoft Foundry connections, so on those versions set it to `0` when your LLM gateway caches on the request body or forwards requests to a third-party provider, or when you connect to Microsoft Foundry directly |
209| `CLAUDE_CODE_AUTO_BACKGROUND_WORKER_CHECKIN_SECONDS` | When `CLAUDE_AUTO_BACKGROUND_TASKS` is enabled, seconds between reminders to Claude to check on [background subagents](/docs/en/sub-agents#run-subagents-in-foreground-or-background) that are still running. Accepts a plain integer from `1` to `86400` only; any other value or spelling reads as unset. When unset, there are no check-in reminders. Requires Claude Code v2.1.248 or later |
210| `CLAUDE_CODE_AUTO_COMPACT_WINDOW` | Set the [auto-compact window](/docs/en/model-config#set-the-auto-compact-window) in tokens, from `100000` to `1000000`. Accepts a plain integer such as `500000` only: a value like `500k` reads as `500` and clamps to the 100K minimum. The effective window is also capped at the model's context window. Takes precedence over the `/autocompact` command, the `--autocompact` flag, and the `autoCompactWindow` setting. The status line's `used_percentage` always measures against the model's full context window, so once this variable is set, that percentage no longer indicates when compaction will run |
211| `CLAUDE_CODE_AUTO_CONNECT_IDE` | Override automatic [IDE connection](/docs/en/vs-code). By default, Claude Code connects automatically when launched inside a supported IDE's integrated terminal. Set to `false` to prevent this. Set to `true` to force a connection attempt when auto-detection fails, such as when tmux obscures the parent terminal. Takes precedence over the [`autoConnectIde`](/docs/en/settings-reference#autoconnectide) global config setting |
212| `CLAUDE_CODE_AWS_CHAIN_RESOLVE_TIMEOUT_MS` | Time in milliseconds Claude Code waits for the AWS default credential provider chain to produce credentials before the request fails with [`AWS default-chain credential resolve timed out`](/docs/en/errors#aws-default-chain-credential-resolve-timed-out) (default: `60000`). Raise it when a step in your chain legitimately needs longer, such as a browser-based SSO sign-in with MFA through a wrapper like `aws-vault`. Applies wherever Claude Code signs with the default chain: [Amazon Bedrock](/docs/en/amazon-bedrock#credential-caching-and-resolution-timeout), [Claude Platform on AWS](/docs/en/claude-platform-on-aws), and the [Mantle endpoint](/docs/en/amazon-bedrock#use-the-mantle-endpoint). Requires Claude Code v2.1.207 or later |
213| `CLAUDE_CODE_BRIDGE_SESSION_ID` | Set automatically in Bash tool and [hook command](/docs/en/hooks) subprocesses while the session has an active [Remote Control](/docs/en/remote-control) connection, and removed when the connection ends. The value is the session's ID in `session_` form, the same identifier that appears in the session's `claude.ai/code` URL, so a script can link back to the session that ran it. Requires Claude Code v2.1.199 or later. In [cloud sessions](/docs/en/claude-code-on-the-web), read `CLAUDE_CODE_REMOTE_SESSION_ID` instead |
214| `CLAUDE_CODE_BS_AS_CTRL_BACKSPACE` | Set to `0` to make Claude Code read the `0x08` byte, also written `^H`, as plain Backspace, or `1` to read it as Ctrl+Backspace. Either value replaces the platform default. By default, Claude Code reads it as Ctrl+Backspace on Windows, except when `TERM_PROGRAM` is `mintty` or `TERM` is `cygwin`, and as plain Backspace on macOS and Linux. Set `0` in a Windows terminal where [Backspace deletes a whole word](/docs/en/terminal-config#fix-backspace-deleting-a-whole-word-on-windows) |
215| `CLAUDE_CODE_CERT_STORE` | Comma-separated list of CA certificate sources for TLS connections. `bundled` is the Mozilla CA set shipped with Claude Code. `system` is the operating system trust store, read only on runtimes with `tls.getCACertificates`: the native binary, or Node 22.15 or later for npm installs. See [CA certificate store](/docs/en/network-config#ca-certificate-store). Default is `bundled,system` |
216| `CLAUDE_CODE_CHILD_SESSION` | Set to `1` in subprocesses Claude Code spawns via the Bash, PowerShell, and Monitor tools, [hook](/docs/en/hooks) commands, and [status line](/docs/en/statusline) commands. Not set for stdio [MCP server](/docs/en/mcp) subprocesses, which are long-lived and outlive the session that spawned them. Unlike `CLAUDECODE`, this is only set by Claude Code itself when it launches a subprocess and not by IDE extensions, so it reliably distinguishes a nested session from a top-level `claude` launched in an IDE-integrated terminal. A nested interactive `claude` TUI started this way is automatically excluded from `--resume`, `--continue`, up-arrow history, and the `claude agents` list. Non-interactive `claude -p` sessions still persist. Set `CLAUDE_CODE_FORCE_SESSION_PERSISTENCE=1` to override this exclusion. Requires Claude Code v2.1.172 or later |
217| `CLAUDE_CODE_CLIENT_CERT` | Path to client certificate file for mTLS authentication |
218| `CLAUDE_CODE_CLIENT_KEY` | Path to client private key file for mTLS authentication |
219| `CLAUDE_CODE_CLIENT_KEY_PASSPHRASE` | Passphrase for encrypted CLAUDE\_CODE\_CLIENT\_KEY (optional) |
220| `CLAUDE_CODE_CONNECT_TIMEOUT_MS` | Removed in v2.1.186 and now a no-op. Previously set a separate timeout for the connect, TLS, and response-header phase of a streaming API request. Use `API_TIMEOUT_MS` for the per-request timeout. For the response-header phase of a streaming request, see `CLAUDE_STREAM_FIRST_BYTE_TIMEOUT_MS` |
221| `CLAUDE_CODE_DEBUG_LOGS_DIR` | Override the debug log file path. Despite the name, this is a file path, not a directory. Requires debug mode to be enabled separately via `--debug`, `/debug`, or the `DEBUG` environment variable: setting this variable alone does not enable logging. The [`--debug-file`](/docs/en/cli-reference#cli-flags) flag does both at once. Defaults to `~/.claude/debug/<session-id>.txt` |
222| `CLAUDE_CODE_DEBUG_LOG_LEVEL` | Minimum log level written to the debug log file. Values: `verbose`, `debug` (default), `info`, `warn`, `error`. Set to `verbose` to include high-volume diagnostics like full status line command output, or raise to `error` to reduce noise |
223| `CLAUDE_CODE_DISABLE_1M_CONTEXT` | Set to `1` to disable [1M context window](/docs/en/model-config#extended-context) support. When set, 1M model variants are unavailable in the model picker, and Claude Code holds sessions on models with a native 1M window, such as [Sonnet 5](/docs/en/model-config#sonnet-5-context-window) and the Fable models, to a 200K window; see [Extended context](/docs/en/model-config#extended-context) for how the hold is enforced. Useful for enterprise environments with compliance requirements. For its role in correcting the window for an unrecognized `[1m]` model ID, see [Correct the window for a gateway or custom model ID](/docs/en/model-config#correct-the-window-for-a-gateway-or-custom-model-id) |
224| `CLAUDE_CODE_DISABLE_ADAPTIVE_THINKING` | Set to `1` to disable [adaptive reasoning](/docs/en/model-config#adjust-effort-level) on Opus 4.6 and Sonnet 4.6 and fall back to the fixed thinking budget controlled by `MAX_THINKING_TOKENS`. Has no effect on [Fable models](/docs/en/model-config#extended-thinking), Sonnet 5, or Opus 4.7 and later, which always use adaptive reasoning |
225| `CLAUDE_CODE_DISABLE_ADMIN_ENV_UNION` | Set to `1` to stop Claude Code from merging [managed settings](/docs/en/managed-settings#precedence-within-the-managed-tier) `env` blocks per key across admin sources, so only the highest-priority source's whole `env` block applies, as before v2.1.223. Set it in the environment that launches Claude Code, since Claude Code ignores a copy delivered through a settings `env` block. Requires Claude Code v2.1.223 or later |
226| `CLAUDE_CODE_DISABLE_ADVISOR_TOOL` | Set to `1` to disable the [advisor tool](/docs/en/advisor). The `/advisor` command becomes unavailable, any configured `advisorModel` is ignored, and the `--advisor` flag is accepted but has no effect, so existing scripts that pass it continue to work without errors |
227| `CLAUDE_CODE_DISABLE_AGENT_VIEW` | Set to `1` to turn off [background agents and agent view](/docs/en/agent-view): `claude agents`, `--bg`, `/background`, and the on-demand supervisor. Equivalent to the [`disableAgentView`](/docs/en/settings-reference#disableagentview) setting |
228| `CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN` | Set to `1` to disable [fullscreen rendering](/docs/en/fullscreen) and use the classic main-screen renderer. The conversation stays in your terminal's native scrollback so `Cmd+f` and tmux copy mode work as usual. Takes precedence over `CLAUDE_CODE_NO_FLICKER` and the [`tui`](/docs/en/settings-reference#tui) setting. You can also switch with `/tui default`. Does not apply to background sessions opened from [agent view](/docs/en/agent-view), which always use fullscreen rendering |
229| `CLAUDE_CODE_DISABLE_ARTIFACT` | Set to `1` to turn off the [Artifact](/docs/en/artifacts) tool, which publishes session output as a private web page on claude.ai. Once you set it, no settings file turns the tool back on. To turn the tool off from a settings file instead, set [`enableArtifact`](/docs/en/settings-reference#enableartifact) to `false`; the deprecated [`disableArtifact`](/docs/en/settings-reference#disableartifact) key also turns it off |
230| `CLAUDE_CODE_DISABLE_ATTACHMENTS` | Set to `1` to disable attachment processing. File mentions with `@` syntax are sent as plain text instead of being expanded into file content |
231| `CLAUDE_CODE_DISABLE_AUTO_MEMORY` | Set to `1` to disable [auto memory](/docs/en/memory#auto-memory). Set to `0` to force auto memory on even when `--bare` mode or [`autoMemoryEnabled: false`](/docs/en/settings-reference#automemoryenabled) would otherwise disable it. When disabled, Claude does not create or load auto memory files |
232| `CLAUDE_CODE_DISABLE_BACKGROUND_TASKS` | Set to `1` to disable all background task functionality, including the `run_in_background` parameter on Bash and subagent tools, auto-backgrounding, and the Ctrl+B shortcut |
233| `CLAUDE_CODE_DISABLE_BEDROCK_CONTENT_TYPE_DEFAULT` | Set to `1` to stop Claude Code from treating an [Amazon Bedrock](/docs/en/amazon-bedrock) streaming response with a missing or empty `Content-Type` header as Amazon Bedrock's binary event stream. By default, Claude Code assumes a gateway dropped the header from an otherwise unmodified response, so it decodes the body and streaming keeps working. Set this only for a gateway that also re-emits the stream as server-sent events; Claude Code then reads the header-less body as server-sent events instead. Requires Claude Code v2.1.239 or later |
234| `CLAUDE_CODE_DISABLE_BEDROCK_CONTENT_TYPE_GUARD` | Set to `1` to skip the check that an [Amazon Bedrock](/docs/en/amazon-bedrock) streaming response carries the `application/vnd.amazon.eventstream` content-type. Without this variable, when a response carries a different content-type, Claude Code fails the request with an error naming that type, which means a [gateway or proxy is transforming the response](/docs/en/amazon-bedrock#streaming-errors-behind-a-gateway-or-proxy). Configure the gateway to forward the `Content-Type` header and body unmodified rather than setting this variable. Requires Claude Code v2.1.208 or later |
235| `CLAUDE_CODE_DISABLE_BG_EXIT_HANDOFF` | Set to `1` to stop a [background session's](/docs/en/agent-view) running background shell commands, dynamic workflows, and, as of v2.1.198, background subagents when the [supervisor](/docs/en/agent-view#the-supervisor-process) stops, restarts, or updates that session's process, instead of handing them to the session's next process. Affects only that handoff: backgrounding a session with `←` or [`/background`](/docs/en/agent-view#from-inside-a-session) still carries in-flight work over, and `CLAUDE_DISABLE_ADOPT` turns off both. Requires Claude Code v2.1.196 or later |
236| `CLAUDE_CODE_DISABLE_BG_SHELL_PRESSURE_REAP` | Set to `1` to stop Claude Code from terminating [background shell commands](/docs/en/interactive-mode#background-bash-commands) when the operating system reports memory pressure. By default, on macOS and Linux, Claude Code terminates a background shell started in the main session on a memory-pressure signal once the session has been idle for 30 minutes and no turn or subagent is running. Windows has no memory-pressure signal, so this variable has no effect there. Requires Claude Code v2.1.193 or later |
237| `CLAUDE_CODE_DISABLE_BUNDLED_SKILLS` | Set to `1` to disable the [skills](/docs/en/skills) and workflows included with Claude Code: bundled skills and workflows are removed entirely, while built-in commands like `/init` stay typable but are hidden from the model. `/doctor` stays typable like the built-in commands; hide it with `DISABLE_DOCTOR_COMMAND` instead. Skills from plugins, `.claude/skills/`, and `.claude/commands/` are unaffected. Equivalent to the [`disableBundledSkills`](/docs/en/settings-reference#disablebundledskills) setting |
238| `CLAUDE_CODE_DISABLE_CFC_PROMPT` | Set to `1` to keep the [Claude in Chrome](/docs/en/chrome) browser tools available while omitting the Chrome section of the system prompt and the `/claude-in-chrome` [bundled skill](/docs/en/skills#bundled-skills). For hosts that embed Claude Code and supply their own browser guidance. Requires Claude Code v2.1.257 or later |
239| `CLAUDE_CODE_DISABLE_CLAUDE_MDS` | Set to `1` to prevent loading any CLAUDE.md memory files into context, including user, project, and auto memory files |
240| `CLAUDE_CODE_DISABLE_CRON` | Set to `1` to disable [scheduled tasks](/docs/en/scheduled-tasks). The `/loop` skill and cron tools become unavailable and any already-scheduled tasks stop firing, including tasks that are already running mid-session |
241| `CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS` | Set to `1` to strip Anthropic-specific `anthropic-beta` request headers and beta tool-schema fields (such as `defer_loading` and `eager_input_streaming`) from API requests. Use this when a proxy gateway rejects requests with errors like "Unexpected value(s) for the `anthropic-beta` header" or "Extra inputs are not permitted". Standard fields (`name`, `description`, `input_schema`, `cache_control`) are preserved. [MCP tool search](/docs/en/mcp#scale-with-mcp-tool-search) is disabled and all MCP tools load upfront, even when you set `ENABLE_TOOL_SEARCH`. On Claude Code v2.1.227 or later, [managed settings](/docs/en/managed-settings) can keep tool search on. [Disable pre-release capabilities](/docs/en/llm-gateway-protocol#disable-pre-release-capabilities) covers where the override applies |
242| `CLAUDE_CODE_DISABLE_EXPLORE_PLAN_AGENTS` | Set to `1` to disable the built-in [Explore and Plan subagents](/docs/en/sub-agents#built-in-subagents). Claude explores with its search tools or the general-purpose subagent instead, and [plan mode](/docs/en/permission-modes#analyze-before-you-edit-with-plan-mode) reads files directly rather than launching Explore and Plan agents. Custom subagents named `Explore` or `Plan` are unaffected. To remove every built-in subagent type in the Agent SDK or non-interactive mode, use `CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS` instead. Requires Claude Code v2.1.198 or later |
243| `CLAUDE_CODE_DISABLE_FAST_MODE` | Set to `1` to disable [fast mode](/docs/en/fast-mode) |
244| `CLAUDE_CODE_DISABLE_FEEDBACK_SURVEY` | Set to `1` to disable the "How is Claude doing?" session quality surveys. Surveys are also disabled when `DISABLE_TELEMETRY`, `DO_NOT_TRACK`, or `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC` is set, unless `CLAUDE_CODE_ENABLE_FEEDBACK_SURVEY_FOR_OTEL` opts back in. To set a sample rate instead of disabling outright, use the [`feedbackSurveyRate`](/docs/en/settings-reference#feedbacksurveyrate) setting. See [Session quality surveys](/docs/en/data-usage#session-quality-surveys) |
245| `CLAUDE_CODE_DISABLE_FILE_CHECKPOINTING` | Set to `1` to disable file [checkpointing](/docs/en/checkpointing). The `/rewind` command will not be able to restore code changes. Overrides the [`fileCheckpointingEnabled`](/docs/en/settings-reference#filecheckpointingenabled) setting |
246| `CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS` | Set to `1` to remove built-in commit and PR workflow instructions and the git status snapshot from Claude's system prompt. Useful when using your own git workflow skills. Takes precedence over the [`includeGitInstructions`](/docs/en/settings-reference#includegitinstructions) setting when set |
247| `CLAUDE_CODE_DISABLE_LEGACY_MODEL_REMAP` | Set to `1` to prevent automatic remapping of Opus 4.0 and 4.1 to the current Opus version on the Anthropic API. Use when you intentionally want to pin an older model. The remap does not run on Amazon Bedrock, Google Cloud's Agent Platform, or Microsoft Foundry |
248| `CLAUDE_CODE_DISABLE_MOUSE` | Set to `1` to disable mouse tracking in [fullscreen rendering](/docs/en/fullscreen). Keyboard scrolling with `PgUp` and `PgDn` still works. Use this to keep your terminal's native copy-on-select behavior |
249| `CLAUDE_CODE_DISABLE_MOUSE_CLICKS` | Set to `1` to disable click, drag, and hover handling in [fullscreen rendering](/docs/en/fullscreen) while keeping mouse-wheel scrolling. Use this when you want wheel scroll to work inside Claude Code but don't want clicks to position the cursor, expand tool output, or open links. `CLAUDE_CODE_DISABLE_MOUSE` takes precedence when both are set. Requires Claude Code v2.1.195 or later |
250| `CLAUDE_CODE_DISABLE_MTLS_RELOAD_ON_STALE_CONNECTION` | Set to `1` to stop Claude Code from re-reading the [mTLS client certificate and key](/docs/en/network-config#mtls-authentication) when an API request fails with a connection-level error, such as a connection reset or a TLS handshake error. With the reload disabled, Claude Code loads rotated files only when it next applies settings or at the next startup. Requires Claude Code v2.1.232 or later |
251| `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC` | Set to any non-empty value, such as `1`, to disable nonessential network traffic: auto-updates, telemetry, error reporting, the `/feedback` command, [Claude-drafted feedback](/docs/en/tools-reference#sendfeedback-tool-behavior), release notes, the [PR and MR status badge](/docs/en/interactive-mode#pr-review-status) checks, and availability checks such as the [fast mode](/docs/en/fast-mode#use-fast-mode-behind-proxies-and-llm-gateways) check. It also stops the [background runs of plugin `command` sources](/docs/en/plugin-marketplaces#when-claude-code-re-runs-the-command), which are local commands rather than network traffic, because they can trigger dependency installs. **Setting it to `0` or `false` still disables this traffic**, unlike most on/off variables; unset the variable to allow it again. Also disables feature-flag fetching, which makes [Remote Control](/docs/en/remote-control#requirements) and the other [features that need feature-flag fetching](#features-that-need-feature-flag-fetching) unavailable. Official plugin marketplace auto-install isn't covered; disable it with `CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL`. Doesn't affect [gateway model discovery](/docs/en/llm-gateway-connect#add-gateway-models-to-the-model-picker), which has its own opt-in |
252| `CLAUDE_CODE_DISABLE_NONSTREAMING_FALLBACK` | Set to `1` to disable the non-streaming fallback when a streaming request fails mid-stream. Streaming errors propagate to the retry layer instead. Useful when a proxy or gateway causes the fallback to produce duplicate tool execution |
253| `CLAUDE_CODE_DISABLE_NOTIFICATION_PRESENCE_CHECK` | Set to `1` to send the `PushNotification` tool's desktop notification even while you are typing in or focused on the terminal. By default the tool skips both the desktop notification and the [mobile push](/docs/en/remote-control#mobile-push-notifications) when it detects recent keyboard activity or terminal focus. This variable disables only that local check, so the server can still suppress the mobile push when it detects that you are active. Requires Claude Code v2.1.193 or later |
254| `CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL` | Set to `1` to disable automatic registration of the official plugin marketplace. Claude Code reads the variable when it is about to register the marketplace, usually during a machine's first interactive launch. If the variable is set at that point, Claude Code skips the registration permanently. Unsetting the variable later doesn't undo the skip. Run `claude plugin marketplace add anthropics/claude-plugins-official` to register the marketplace at any time |
255| `CLAUDE_CODE_DISABLE_PERMISSION_PROMPT_NOTIFY_HOOKS` | Set to `1` to stop Claude Code from running your [`Notification` hooks for unanswered permission requests](/docs/en/hooks#notification) in sessions where Claude Code sends them to the Agent SDK's `canUseTool` callback, which is how Claude Desktop and the VS Code extension host Claude Code. Has no effect in terminal sessions. Requires Claude Code v2.1.233 or later |
256| `CLAUDE_CODE_DISABLE_POLICY_SKILLS` | Set to `1` to skip loading skills from the system-wide managed skills directory. Useful for container or CI sessions that should not load operator-provisioned skills |
257| `CLAUDE_CODE_DISABLE_TERMINAL_TITLE` | Set to `1` to disable automatic terminal title updates based on conversation context. In Agent SDK and `claude -p` sessions, this also skips the background small/fast-model request that generates the session title |
258| `CLAUDE_CODE_DISABLE_THINKING` | Set to `1` to omit the `thinking` parameter from API requests entirely. This is a compatibility option for proxies and gateways that reject the parameter. The variable's behavior is unchanged from earlier versions; on models that think by default, omitting the parameter means the model may still think. To explicitly disable [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) on the Anthropic API, use `MAX_THINKING_TOKENS=0` instead, which is also ineffective on [Fable models](/docs/en/model-config#extended-thinking) since they can't have thinking turned off. On [third-party providers](/docs/en/third-party-integrations), `0` likewise omits the parameter, so the two variables behave the same there |
259| `CLAUDE_CODE_DISABLE_UNKNOWN_MODEL_WINDOW_ENFORCEMENT` | Set to `1` to skip proactive [auto-compaction](/docs/en/costs#reduce-token-usage) when Claude Code doesn't recognize the model ID, such as an [LLM gateway](/docs/en/llm-gateway) alias. Without this variable, Claude Code compacts at the context window it assumes for the ID. `CLAUDE_CODE_MAX_CONTEXT_TOKENS` can correct the assumed window instead; see [Correct the window for a gateway or custom model ID](/docs/en/model-config#correct-the-window-for-a-gateway-or-custom-model-id) for when each variable applies. Requires Claude Code v2.1.223 or later |
260| `CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL` | Set to `1` to disable virtual scrolling in [fullscreen rendering](/docs/en/fullscreen) and render every message in the transcript. Use this if scrolling in fullscreen mode shows blank regions where messages should appear |
261| `CLAUDE_CODE_DISABLE_WORKFLOWS` | Set to `1` to disable [workflows](/docs/en/workflows#turn-workflows-off). Equivalent to the [`disableWorkflows`](/docs/en/settings-reference#disableworkflows) setting |
262| `CLAUDE_CODE_EFFORT_LEVEL` | Set the effort level for supported models. Values: `low`, `medium`, `high`, `xhigh`, `max`, or `auto` to use the model default. Available levels depend on the model. Takes precedence over `--effort`, `/effort`, and the `modelSettings` and `effortLevel` settings. See [Adjust effort level](/docs/en/model-config#adjust-effort-level) |
263| `CLAUDE_CODE_ENABLE_APPEND_SUBAGENT_PROMPT` | Set to `1` to enable appending extra text to the end of the system prompt of every [subagent](/docs/en/sub-agents) other than a [forked subagent](/docs/en/sub-agents#fork-the-current-conversation). The [`--append-subagent-system-prompt`](/docs/en/cli-reference#cli-flags) flag supplies the appended text and sets this variable automatically, so you don't need to set it yourself. Requires Claude Code v2.1.205 or later |
264| `CLAUDE_CODE_ENABLE_AUTO_MODE` | Accepted for compatibility with older releases and has no effect. Auto mode is available by default on every provider, including Amazon Bedrock, Google Cloud's Agent Platform, Microsoft Foundry, and signed-in [Claude apps gateway](/docs/en/claude-apps-gateway) sessions. In v2.1.158 through v2.1.206, setting this to `1` was required to make [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode) available on those providers |
265| `CLAUDE_CODE_ENABLE_AWAY_SUMMARY` | Override [session recap](/docs/en/interactive-mode#session-recap) availability. Set to `0` to force recaps off regardless of the `/config` toggle. Set to `1` to force recaps on when [`awaySummaryEnabled`](/docs/en/settings-reference#awaysummaryenabled) is `false`. Takes precedence over the setting and `/config` toggle |
266| `CLAUDE_CODE_ENABLE_BACKGROUND_PLUGIN_REFRESH` | Set to `1` to refresh plugin state at turn boundaries in [non-interactive mode](/docs/en/headless) after a background install completes. Off by default because the refresh changes the system prompt mid-session, which invalidates [prompt caching](/docs/en/prompt-caching) for that turn |
267| `CLAUDE_CODE_ENABLE_FEEDBACK_SURVEY_FOR_OTEL` | Set to `1` to route the "How is Claude doing?" session quality survey to your own [OpenTelemetry collector](/docs/en/monitoring-usage) when Anthropic-bound nonessential traffic is blocked. Survey ratings are emitted only as OTEL events to your configured collector. No survey data is sent to Anthropic in this mode. Applies when `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC`, `DISABLE_TELEMETRY`, or `DO_NOT_TRACK` is set, and has no effect otherwise. `CLAUDE_CODE_DISABLE_FEEDBACK_SURVEY` and the organization product feedback policy take precedence |
268| `CLAUDE_CODE_ENABLE_FINE_GRAINED_TOOL_STREAMING` | Controls whether tool call inputs stream from the API as Claude generates them. With this off, a large tool input such as a long file write arrives only after Claude finishes generating it, which can look like it's hanging. Enabled by default on the Anthropic API. On Amazon Bedrock and Google Cloud's Agent Platform, enabled per model where the deployed container supports it. Set to `0` to opt out. Set to `1` to force on when routing through a proxy via `ANTHROPIC_BASE_URL`, `ANTHROPIC_VERTEX_BASE_URL`, or `ANTHROPIC_BEDROCK_BASE_URL`. Off by default on Microsoft Foundry and [gateway](/docs/en/llm-gateway) connections |
269| `CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY` | Set to `1` to populate the `/model` picker from your gateway's `/v1/models` endpoint when `ANTHROPIC_BASE_URL` points at an Anthropic-compatible gateway such as LiteLLM, Kong, or an internal proxy. Off by default because gateways backed by a shared API key would otherwise show every user every model the key can access. Discovered models are still filtered by an [`availableModels`](/docs/en/settings-reference#availablemodels) allowlist the session receives; deliver the list through [MDM or a managed settings file](/docs/en/managed-settings#delivery-mechanisms), since [server-managed delivery is not available on gateway configurations](/docs/en/server-managed-settings#platform-availability) |
270| `CLAUDE_CODE_ENABLE_OPUS_4_7_FAST_MODE` | Removed in v2.1.142, when the [fast mode](/docs/en/fast-mode) default moved from Opus 4.6 to Opus 4.7 |
271| `CLAUDE_CODE_ENABLE_PROMPT_SUGGESTION` | Set to `false` to turn off prompt suggestions, the grayed-out predictions that appear in your prompt input. Takes precedence over the [`promptSuggestionEnabled`](/docs/en/settings-reference#promptsuggestionenabled) setting, which is what the **Prompt suggestions** toggle in `/config` writes. Claude Code also [pauses suggestions while your account is close to or at its usage limit](/docs/en/interactive-mode#when-claude-code-skips-suggestions). Set to `true` to keep them on until you reach the limit. Requires Claude Code v2.1.238 or later. See [Prompt suggestions](/docs/en/interactive-mode#prompt-suggestions) |
272| `CLAUDE_CODE_ENABLE_TASKS` | Selects which task-tracking tools Claude Code provides in [sessions that have them](/docs/en/tools-reference#task-tool-availability). By default, Claude Code provides the Task tools `TaskCreate`, `TaskUpdate`, `TaskGet`, and `TaskList`. Set to `0` to get the legacy `TodoWrite` tool instead. See [Task list](/docs/en/interactive-mode#task-list) |
273| `CLAUDE_CODE_ENABLE_TELEMETRY` | Set to `1` to enable OpenTelemetry data collection for metrics and logging. Required before configuring OTel exporters. See [Monitoring](/docs/en/monitoring-usage) |
274| `CLAUDE_CODE_ENABLE_TODO_TOOLS` | Set to `1` to get the task-tracking tools on the models listed under [Task tool availability](/docs/en/tools-reference#task-tool-availability), where Claude Code otherwise leaves them out. `CLAUDE_CODE_ENABLE_TASKS` still selects the Task tools or `TodoWrite`. Requires Claude Code v2.1.233 or later |
275| `CLAUDE_CODE_EXIT_AFTER_STOP_DELAY` | Time in milliseconds to wait after the query loop becomes idle before automatically exiting. Useful for automated workflows and scripts using SDK mode |
276| `CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS` | Set to `1` to enable [agent teams](/docs/en/agent-teams). Agent teams are experimental and disabled by default |
277| `CLAUDE_CODE_EXTRA_BODY` | JSON object to merge into the top level of every API request body. Useful for passing provider-specific parameters that Claude Code doesn't expose directly. A value exported in your shell also applies to the [background sessions](/docs/en/agent-view) you dispatch with `claude agents` or `--bg`. Before v2.1.206, background sessions ignored a shell-exported value and used whatever copy the background supervisor process inherited |
278| `CLAUDE_CODE_FILE_READ_MAX_OUTPUT_TOKENS` | Override the default token limit for file reads. Useful when you need to read larger files in full |
279| `CLAUDE_CODE_FORCE_SESSION_PERSISTENCE` | Set to `1` to force transcript persistence, prompt history, and `claude agents` registration even when this `claude` was launched from inside another Claude Code session. Use when an inherited `CLAUDE_CODE_CHILD_SESSION` value, for example from a `screen` session or a background launcher first started by Claude Code's Bash tool, causes a genuine top-level session to be misclassified as nested. As of v2.1.178, Claude Code detects the tmux case automatically and ignores the inherited marker, so tmux no longer needs this variable. Also honored on v2.1.169 and earlier; has no effect on v2.1.170 and v2.1.171, where the nested-session detection it overrides was removed |
280| `CLAUDE_CODE_FORCE_STRIKETHROUGH` | Set to `1` to force strikethrough rendering for `~~text~~` in Claude's responses when your terminal supports it but is not auto-detected, such as over SSH without `TERM_PROGRAM` forwarded. Without this, undetected terminals show the literal `~~` markers instead of rendering the text as strikethrough. Requires Claude Code v2.1.186 or later |
281| `CLAUDE_CODE_FORCE_SYNC_OUTPUT` | Set to `1` to force-enable DEC private mode 2026 [synchronized output](https://gist.github.com/christianparpart/d8a62cc1ab659194337d73e399004036) when your terminal supports it but is not auto-detected. Useful for emulators such as Emacs `eat` that implement BSU/ESU but do not reply to the capability probe. Has no effect under tmux. Unlike `CLAUDE_CODE_NO_FLICKER`, which switches to [fullscreen rendering](/docs/en/fullscreen), this doesn't change the renderer |
282| `CLAUDE_CODE_FORK_SUBAGENT` | Controls [fork mode](/docs/en/sub-agents#turn-fork-mode-on-or-off), which lets Claude spawn [forked subagents](/docs/en/sub-agents#fork-the-current-conversation) itself and is on by default in interactive sessions only. Set to `1` to turn it on in `claude -p` and the Agent SDK as well, or `0` to turn it off in every kind of session. You can run `/subtask` whether or not fork mode is on. The interactive default requires Claude Code v2.1.232 or later; on earlier versions, set the variable to `1` to turn fork mode on |
283| `CLAUDE_CODE_FORWARD_SUBAGENT_TEXT` | Set to `1` to emit [subagent](/docs/en/sub-agents) text and thinking blocks in `claude -p --output-format stream-json` output, the same behavior as the [`--forward-subagent-text`](/docs/en/cli-reference#cli-flags) flag. Use the variable when a harness invokes `claude` and can't pass the flag itself. Unlike the flag, which exits with an error outside non-interactive mode with stream-json output, the variable is ignored there so that nested invocations keep working when it's set process-wide. Requires Claude Code v2.1.211 or later |
284| `CLAUDE_CODE_GIT_BASH_PATH` | Windows only: path to the Git Bash executable (`bash.exe`). Use when Git Bash is installed but not in your PATH. If the path doesn't exist or the file isn't named `bash.exe`, `sh.exe`, `bash`, or `sh`, Claude Code ignores the variable and auto-detects Git Bash as if it were unset, logging a warning visible with `--debug`. Before v2.1.219, Claude Code exited at startup when the path didn't exist, and used any existing file as the shell without checking that it was bash or sh. See [Windows setup](/docs/en/setup#set-up-on-windows) |
285| `CLAUDE_CODE_GLOB_HIDDEN` | Set to `false` to exclude dotfiles from results when Claude invokes the [Glob tool](/docs/en/tools-reference#glob-tool-behavior). Included by default. Does not affect `@` file autocomplete, `ls`, Grep, or Read |
286| `CLAUDE_CODE_GLOB_NO_IGNORE` | Set to `false` to make the [Glob tool](/docs/en/tools-reference#glob-tool-behavior) respect `.gitignore` patterns. By default, Glob returns all matching files including gitignored ones. Does not affect `@` file autocomplete, which has its own [`respectGitignore` setting](/docs/en/settings-reference#respectgitignore) |
287| `CLAUDE_CODE_GLOB_TIMEOUT_SECONDS` | Timeout in seconds for Glob tool file discovery. Defaults to 20 seconds on most platforms and 60 seconds on WSL |
288| `CLAUDE_CODE_GOAL_CHECKIN_MINUTES` | How many minutes background work can keep an active goal waiting before Claude Code [asks Claude to check on it](/docs/en/goal#background-work-defers-evaluation). Default `30`. Set `0` to turn check-ins off. Give whole minutes in plain digits, at most `10080`, which is one week. Claude Code treats any other value as unset and uses the default. Requires Claude Code v2.1.234 or later |
289| `CLAUDE_CODE_HIDE_CWD` | Set to `1` to hide the working directory in the startup logo. Useful for screenshares or recordings where the path exposes your OS username |
290| `CLAUDE_CODE_IDE_HOST_OVERRIDE` | Override the host address used to connect to the IDE extension. By default Claude Code auto-detects the correct address, including WSL-to-Windows routing |
291| `CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL` | Set to `1` to skip auto-installation of IDE extensions. Equivalent to setting [`autoInstallIdeExtension`](/docs/en/settings-reference#autoinstallideextension) to `false` |
292| `CLAUDE_CODE_IDE_SKIP_VALID_CHECK` | Set to `1` to skip validation of IDE lockfile entries during connection. Use when auto-connect fails to find your IDE despite it running |
293| `CLAUDE_CODE_MAX_CONCURRENT_SUBAGENTS` | How many [subagents](/docs/en/sub-agents#concurrent-subagent-limit) can be running in one session before the Agent tool refuses to spawn another (default: 20). Accepts a positive whole number in plain digits; anything else is ignored, so the variable can adjust the cap but can't disable it. Requires Claude Code v2.1.217 or later |
294| `CLAUDE_CODE_MAX_CONTEXT_TOKENS` | Override the context window size Claude Code assumes for the active model. As of v2.1.193, how it applies depends on how Claude Code resolves the model ID; see [Correct the window for a gateway or custom model ID](/docs/en/model-config#correct-the-window-for-a-gateway-or-custom-model-id). Use this when routing to a model through `ANTHROPIC_BASE_URL` whose context window does not match the built-in size for its name |
295| `CLAUDE_CODE_MAX_OUTPUT_TOKENS` | Set the maximum number of output tokens for most requests. Defaults and caps vary by model; see [max output tokens](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison). Claude Code defaults to 32000 for model IDs it doesn't recognize, such as gateway-specific names, and lowers values above a model's cap to the cap. Increasing this value reduces the effective context window available before [auto-compaction](/docs/en/costs#reduce-token-usage) triggers |
296| `CLAUDE_CODE_MAX_RETRIES` | Override the number of times to retry failed API requests (default: 10). Capped at 15 as of v2.1.186; as of v2.1.199, `CLAUDE_CODE_RETRY_WATCHDOG` raises the default and removes the cap. For unattended sessions that need to wait through longer outages, set `CLAUDE_CODE_RETRY_WATCHDOG` instead |
297| `CLAUDE_CODE_MAX_SUBAGENTS_PER_SESSION` | Removed in v2.1.224 and now a no-op. Previously capped the total number of [subagents](/docs/en/sub-agents) Claude could spawn with the Agent tool in one session (default: 200); spawning past the cap failed with `Subagent spawn limit reached`. The [concurrent subagent limit](/docs/en/sub-agents#concurrent-subagent-limit) and the [depth limit](/docs/en/sub-agents#let-subagents-spawn-their-own-subagents) still apply |
298| `CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH` | Number of [subagent layers](/docs/en/sub-agents#let-subagents-spawn-their-own-subagents) allowed below the main conversation (default: 3). At the default, subagents can spawn their own subagents, and a subagent at the third layer can't spawn further; set `1` to turn nesting off. In v2.1.217 through v2.1.218, the default was 1, so a subagent couldn't spawn its own unless you raised the limit; v2.1.219 raised the default to 3. Accepts a positive whole number in plain digits; anything else is ignored, so the limit can be adjusted but not removed. Requires Claude Code v2.1.217 or later |
299| `CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY` | Maximum number of read-only tools and subagents that can execute in parallel (default: 10). Higher values increase parallelism but consume more resources |
300| `CLAUDE_CODE_MAX_TURNS` | Cap the number of agentic turns when no explicit limit is passed. Equivalent to passing [`--max-turns`](/docs/en/cli-reference#cli-flags), which takes precedence when both are set. A value that is not a positive integer is rejected at startup with an error rather than treated as no cap |
301| `CLAUDE_CODE_MAX_WEB_SEARCHES_PER_SESSION` | Cap on the total number of [WebSearch](/docs/en/tools-reference#websearch-tool-behavior) calls one session can make (default: 200). When Claude reaches the cap, further WebSearch calls return a notice telling it to continue with the information it already gathered. Accepts a positive whole number with no upper bound. Anything else is ignored and the default applies, so the cap can be raised but not turned off. Requires Claude Code v2.1.212 or later |
302| `CLAUDE_CODE_MCP_ALLOWLIST_ENV` | Set to `1` to spawn stdio MCP servers with only a safe baseline environment plus the server's configured `env`, instead of inheriting your shell environment |
303| `CLAUDE_CODE_MCP_AUTO_BACKGROUND_MS` | Elapsed time in milliseconds before a still-running MCP tool call [moves to a background task](/docs/en/mcp#automatic-backgrounding-of-long-tool-calls) (default: 120000, or 2 minutes). Set to `0` to turn automatic backgrounding off. Requires Claude Code v2.1.212 or later |
304| `CLAUDE_CODE_MCP_TOOL_IDLE_TIMEOUT` | Idle timeout in milliseconds for MCP tool calls. When a stdio, HTTP, SSE, WebSocket, or [claude.ai connector](/docs/en/mcp#use-mcp-servers-from-claude-ai) MCP server sends no response and no progress notification for this long, the tool call aborts with an error instead of waiting for the overall `MCP_TOOL_TIMEOUT`. Overrides the per-transport defaults of 300000 (5 minutes) for network servers and 1800000 (30 minutes) for stdio servers. Set to `0` to disable the idle check. Values below 1000 are raised to one second, and the value is capped at the effective `MCP_TOOL_TIMEOUT`. A per-server `timeout` in `.mcp.json` of at least 1000 raises that server's idle window to at least the `timeout` value. Doesn't apply to IDE servers or SDK in-process servers. Requires Claude Code v2.1.187 or later. Before v2.1.203, stdio servers were exempt from the idle timeout |
305| `CLAUDE_CODE_MESSAGING_SOCKET` | Set by Claude Code, not by you: in sessions that bind an [inbox socket](/docs/en/cross-session-messaging#the-sessions-inbox-socket), Claude Code exports that socket's path to hooks and Bash commands when it binds the socket. In a session that starts with messaging on, Claude Code binds the socket before any hook runs. Other sessions on the machine deliver messages to this path. Each session exports its own socket rather than one inherited from a parent, and messages arriving on it go through the session's [inbound controls](/docs/en/cross-session-messaging#control-inbound-messages). Settings `env` blocks can't set it. Requires Claude Code v2.1.224 or later |
306| `CLAUDE_CODE_MESSAGING_TOKEN` | Set by Claude Code, not by you: in sessions that bind an [inbox socket](/docs/en/cross-session-messaging#the-sessions-inbox-socket), Claude Code exports this per-session token to hooks and Bash commands alongside `CLAUDE_CODE_MESSAGING_SOCKET`. A script posting to the socket can send `{"type":"auth","token":"<token>"}` as its first line to prove it belongs to the session. On native Windows, Claude Code requires this line and closes any connection that doesn't open with a valid one. The [own-child rules](/docs/en/cross-session-messaging#the-sessions-inbox-socket) say when Claude Code consults the token. Each session exports its own token, never one inherited from a parent session. Settings `env` blocks can't set it. Requires Claude Code v2.1.228 or later |
307| `CLAUDE_CODE_NATIVE_CURSOR` | Set to `1` to show the terminal's own cursor at the input caret instead of a drawn block. The cursor respects the terminal's blink, shape, and focus settings |
308| `CLAUDE_CODE_NEW_INIT` | Set to `1` to make `/init` run an interactive setup flow. The flow asks which files to generate, including CLAUDE.md, skills, and hooks, before exploring the codebase and writing them. Without this variable, `/init` generates a CLAUDE.md automatically without prompting |
309| `CLAUDE_CODE_NO_FLICKER` | Set to `1` to enable [fullscreen rendering](/docs/en/fullscreen), a research preview that reduces flicker and keeps memory flat in long conversations. Overrides the [`tui`](/docs/en/settings-reference#tui) setting; you can also switch with `/tui fullscreen` |
310| `CLAUDE_CODE_OAUTH_REFRESH_TOKEN` | OAuth refresh token for Claude.ai authentication. When set, `claude auth login` exchanges this token directly instead of opening a browser. Requires `CLAUDE_CODE_OAUTH_SCOPES`. Useful for provisioning authentication in automated environments |
311| `CLAUDE_CODE_OAUTH_SCOPES` | Space-separated OAuth scopes the refresh token was issued with, such as `"user:profile user:inference user:sessions:claude_code"`. Required when `CLAUDE_CODE_OAUTH_REFRESH_TOKEN` is set |
312| `CLAUDE_CODE_OAUTH_TOKEN` | OAuth access token for claude.ai authentication. Alternative to `/login` for SDK and automated environments. Takes precedence over keychain-stored credentials. Generate one with [`claude setup-token`](/docs/en/authentication#generate-a-long-lived-token). Unless you run [`/login`](/docs/en/authentication#authentication-precedence), Claude Code uses the token you set for the whole session. To replace an expired token, generate a new one and restart |
313| `CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE` | Removed in v2.1.160 and now a no-op. Previously pinned [fast mode](/docs/en/fast-mode) to Claude Opus 4.6 instead of the current default. Opus 4.6 no longer supports fast mode |
314| `CLAUDE_CODE_OTEL_CONTENT_MAX_LENGTH` | Maximum length of content-bearing OpenTelemetry attributes (model responses, tool content, system prompts, raw API bodies), truncation marker included, in UTF-16 code units (default: 61440, i.e. 60 KB). Raise it only if your telemetry backend accepts attribute values larger than 64 KB, or lower it to cut telemetry volume. Requires Claude Code v2.1.214 or later. See [Monitoring](/docs/en/monitoring-usage) |
315| `CLAUDE_CODE_OTEL_DIAG_STDERR` | Set to `1` to write OpenTelemetry exporter diagnostic errors to stderr. By default these errors only appear with `--debug`, so a misconfigured exporter such as a Prometheus port collision otherwise fails silently. Requires Claude Code v2.1.179 or later. See [Monitoring](/docs/en/monitoring-usage) |
316| `CLAUDE_CODE_OTEL_FLUSH_TIMEOUT_MS` | Timeout in milliseconds for flushing pending OpenTelemetry spans (default: 5000). See [Monitoring](/docs/en/monitoring-usage) |
317| `CLAUDE_CODE_OTEL_HEADERS_HELPER_DEBOUNCE_MS` | Interval for refreshing dynamic OpenTelemetry headers in milliseconds (default: 1740000 / 29 minutes). See [Dynamic headers](/docs/en/monitoring-usage#dynamic-headers) |
318| `CLAUDE_CODE_OTEL_SHUTDOWN_TIMEOUT_MS` | Timeout in milliseconds for the OpenTelemetry exporter to finish on shutdown (default: 2000). Increase if metrics are dropped at exit. See [Monitoring](/docs/en/monitoring-usage) |
319| `CLAUDE_CODE_PACKAGE_MANAGER_AUTO_UPDATE` | Set to `1` to let Claude Code run your package manager's upgrade command in the background when a new version is available. Applies to Homebrew and WinGet installations. Other package managers continue to show the upgrade command without running it. See [Auto updates](/docs/en/setup#auto-updates) |
320| `CLAUDE_CODE_PERFORCE_MODE` | Set to `1` to enable Perforce-aware write protection. When set, Edit, Write, and NotebookEdit fail with a `p4 edit <file>` hint if the target file lacks the owner-write bit, which Perforce clears on synced files until `p4 edit` opens them. This prevents Claude Code from bypassing Perforce change tracking |
321| `CLAUDE_CODE_PLUGIN_CACHE_DIR` | Override the plugins root directory. Despite the name, this sets the parent directory, not the cache itself: marketplaces and the plugin cache live in subdirectories under this path. Defaults to `~/.claude/plugins`
errors Changed · +77 / -0 lines
### Working directory is a network path
This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.
from line 217
217217| `Claude Code exited after an unrecoverable interface error (...)` | [Configuration warnings](#exited-after-an-unrecoverable-interface-error) |
218218| `Agent descriptions are over the 15.0k-token limit` | [Configuration warnings](#agent-descriptions-are-over-the-15000-token-limit) |
219219| `Ignoring N permissions.allow entries from ... this workspace has not been trusted` | [Configuration warnings](#workspace-has-not-been-trusted) |
220| `is a network path, which cannot be added as a working directory` | [Configuration warnings](#working-directory-is-a-network-path) |
220221| `Remote managed settings failed to load (<cause>)` | [Configuration warnings](#remote-managed-settings-failed-to-load) |
222| `MCP server <name> is blocked by enterprise managed policy` | [Configuration warnings](#mcp-server-is-blocked-by-enterprise-managed-policy) |
221223| `Managed settings document could not be parsed as a JSON object; none of its settings are in effect. Fix or remove it.` | [Configuration warnings](#managed-settings-document-could-not-be-parsed) |
222224| `Managed settings drop-in directory could not be read` | [Configuration warnings](#managed-settings-document-could-not-be-parsed) |
223225| `"crossSessionInbound" must be one of "accept", "hold", "refuse"` | [Configuration warnings](#crosssessioninbound-must-be-one-of-accept-hold-refuse) |
224226| `headersHelper not run — this workspace has no persisted trust` | [Configuration warnings](#headershelper-not-run) |
227| `Invalid permission rule "..." was skipped: Malformed Tool(content) rule` | [Configuration warnings](#malformed-tool-content-rule) |
225228| `... is not matched by file permission checks` | [Configuration warnings](#is-not-matched-by-file-permission-checks) |
226229| `... has a wildcard before the rest of the command` | [Configuration warnings](#has-a-wildcard-before-the-rest-of-the-command) |
227230| `CLAUDE_CODE_DISABLE_1M_CONTEXT is set, but the 200K limit isn't enforced` | [Configuration warnings](#the-200k-limit-isnt-enforced) |
from line 2349
23462349Each reason the message can show in parentheses:
23472350
23482351* `launch flags: a custom system prompt, a tool allowlist, or restricted settings`: you started the session with a flag Claude Code doesn't pass back to the restarted process. These flags include [`--system-prompt`](/docs/en/cli-reference#cli-flags), `--system-prompt-file`, `--append-system-prompt-file`, a [`--tools`](/docs/en/cli-reference#cli-flags) allowlist, [`--setting-sources`](/docs/en/cli-reference#cli-flags), and [`--permission-prompt-tool`](/docs/en/cli-reference#cli-flags)
2349* `permission rules set for this session only`: a [permission update](/docs/en/hooks#permission-update-entries) from a hook or SDK caller added deny or ask rules with the `session` destination. Session-scoped allow rules don't trigger the refusal. A restart drops them, and Claude Code prompts again instead
2350* `ask-before-running rules with no command-line form`: a permission update from a hook or SDK caller added ask rules alongside the rules Claude Code passes back as `--allowed-tools` and `--disallowed-tools`. No flag exists for ask rules
2351* `permission rules a command line cannot carry intact` and `added directories a command line cannot carry intact`: a permission update added a rule or directory path mid-session. The restarted process's command line can't carry its text as the same value
2352
2353**What to do:**
2354
2355* In a session started without those restrictions, run `/tui fullscreen`, or `/tui default` to switch back. Claude Code saves the [`tui` setting](/docs/en/settings-reference#tui) there
2356
2357<h3 id="terminal-setup-left-your-zed-keymap-unchanged">
2358 /terminal-setup left your Zed keymap unchanged
2359</h3>
2360
2361You ran [`/terminal-setup`](/docs/en/terminal-config#enter-multiline-prompts) in Zed, and Claude Code couldn't complete the update to you
2352* `permission rules set for this session only`: a [permission update](/docs/en/hooks#permission-update-entries) from a hook or SDK caller added deny or ask rules with the `session` destination. Session-scoped allow rules don't trigger the refusal. A restart drops t
interactive-mode Changed · +23 / -30 lines
from line 38
3838
3939### Text editing
4040
41| Shortcut | Description | Context |
42| :------------------------- | :----------------------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
43| `Ctrl+A` | Move cursor to start of current line | In multiline input, moves to the start of the current logical line |
44| `Ctrl+E` | Move cursor to end of current line | In multiline input, moves to the end of the current logical line |
45| `Ctrl+K` | Delete to end of line | Stores deleted text for pasting |
46| `Ctrl+U` | Delete from cursor to line start | Stores deleted text for pasting. Repeat to clear across lines in multiline input. On macOS, terminal emulators including iTerm2 and Terminal.app map `Cmd+Backspace` to this shortcut |
47| `Ctrl+W` | Delete previous word | Stores deleted text for pasting. On macOS, `Option+Delete` deletes the previous word, and on Windows, `Ctrl+Backspace` does. To make `Ctrl+W` delete back to the previous whitespace instead, [set `keybindingFlavor` to `"readline"`](#make-ctrl-w-delete-back-to-whitespace) |
48| `Ctrl+Y` | Paste deleted text | Paste text deleted with `Ctrl+K`, `Ctrl+U`, `Ctrl+W`, or, under [`keybindingFlavor: "readline"`](#make-ctrl-w-delete-back-to-whitespace), `Alt+D` |
49| `Alt+Y` (after `Ctrl+Y`) | Cycle paste history | After pasting, cycle through previously deleted text. Requires [Option as Meta](#keyboard-shortcuts) on macOS |
50| `Alt+B` | Move cursor back one word | Word navigation. Requires [Option as Meta](#keyboard-shortcuts) on macOS |
51| `Alt+F` | Move cursor forward one word | Moves to the start of the next word, or to the end of the current word when [`keybindingFlavor` is `"readline"`](#make-ctrl-w-delete-back-to-whitespace). Requires [Option as Meta](#keyboard-shortcuts) on macOS |
52| `Alt+D` | Delete next word | Deletes through the space after the word, or to the end of the word when [`keybindingFlavor` is `"readline"`](#make-ctrl-w-delete-back-to-whitespace). Requires [Option as Meta](#keyboard-shortcuts) on macOS |
53| `Ctrl+_` or `Ctrl+Shift+-` | Undo last input edit | Restores the previous input text and cursor position |
41| Shortcut | Description | Context |
42| :------------------------- | :----------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
43| `Ctrl+A` | Move cursor to start of current line | In multiline input, moves to the start of the current logical line |
44| `Ctrl+E` | Move cursor to end of current line | In multiline input, moves to the end of the current logical line |
45| `Ctrl+K` | Delete to end of line | Stores deleted text for pasting |
46| `Ctrl+U` | Delete from cursor to line start | Stores deleted text for pasting. Repeat to clear across lines in multiline input. On macOS, terminal emulators including iTerm2 and Terminal.app map `Cmd+Backspace` to this shortcut |
47| `Ctrl+W` | Delete back to previous whitespace | Stores deleted text for pasting. One press removes a whole path or `--flag=value`. To delete only the previous word, press `Option+Delete` on macOS or `Ctrl+Backspace` on Windows |
48| `Ctrl+Y` | Paste deleted text | Pastes the text you last deleted with one of the word or line deletion shortcuts, such as `Ctrl+K`, `Ctrl+U`, or `Ctrl+W` |
49| `Alt+Y` (after `Ctrl+Y`) | Cycle paste history | After pasting, cycle through previously deleted text. Requires [Option as Meta](#keyboard-shortcuts) on macOS |
50| `Alt+B` | Move cursor back one word | Word navigation. Requires [Option as Meta](#keyboard-shortcuts) on macOS |
51| `Alt+F` | Move cursor forward one word | Moves to the end of the current word, or to the end of the next word when the cursor is between words. Requires [Option as Meta](#keyboard-shortcuts) on macOS |
52| `Alt+D` | Delete to end of word | Deletes to the end of the current word, or to the end of the next word when the cursor is between words. Stores deleted text for pasting. Requires [Option as Meta](#keyboard-shortcuts) on macOS |
53| `Ctrl+_` or `Ctrl+Shift+-` | Undo last input edit | Restores the previous input text and cursor position |
5454
5555<h3 id="make-ctrl-w-delete-back-to-whitespace">
56 Make editing keys follow readline conventions
56 Word boundaries in editing shortcuts
5757</h3>
5858
59Set [`keybindingFlavor`](/docs/en/settings-reference#keybindingflavor) to `"readline"` to make the prompt's editing keys follow GNU readline conventions, as in Bash. The default value is `"classic"`. Requires Claude Code v2.1.238 or later. Under `"readline"`:
59The word shortcuts `Alt+B`, `Alt+F`, `Alt+D`, `Option+Delete`, and `Ctrl+Backspace` treat a word as a run of letters and digits, so punctuation such as `_`, `.`, and `/` separates words. With `src/utils/foo.ts` in the prompt, repeated presses of `Alt+B` stop at the start of `ts`, `foo`, `utils`, and `src`.
6060
61* `Ctrl+W` deletes back to the previous whitespace.
62* A word is a run of letters and digits, so punctuation such as `_`, `.`, and `/` separates words. `Alt+F` and `Alt+D` stop at the end of the current word, and `Ctrl+Y` can paste back text that `Alt+D` deleted. Before v2.1.239, Claude Code applied `"readline"` only to `Ctrl+W`.
61`Ctrl+W` is different: it ignores punctuation and deletes back to the previous whitespace, so one press removes all of `src/utils/foo.ts`.
6362
64Add the setting to `~/.claude/settings.json`:
63In text written without spaces, such as Chinese or Japanese, the word shortcuts still move or delete one word at a time.
6564
66```json theme={null}
67{
68 "keybindingFlavor": "readline"
69}
70```
65These readline conventions apply in Claude Code v2.1.261 and later. The [`keybindingFlavor`](/docs/en/settings-reference#keybindingflavor) setting that turned them on in earlier versions is deprecated and has no effect.
7166
72To confirm, type `fix the bug in src/utils/foo.ts` in the prompt and press `Ctrl+W`. Claude Code removes `src/utils/foo.ts`. Under `"classic"` it removes only `foo.ts`.
73
74This setting is separate from the [keybindings configuration file](/docs/en/keybindings): the word-editing commands aren't actions there, so you can't remap them in `keybindings.json`.
67You can't remap these shortcuts in the [keybindings configuration file](/docs/en/keybindings), which has no actions for them.
7568
7669### Theme and display
7770
llm-gateway-connect Changed · +4 / -2 lines
from line 305
305305
306306To enable it, set `CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY=1` in your shell or in the `env` block of `~/.claude/settings.json`.
307307
308Discovered models appear as additional `/model` entries labeled `From gateway`. To confirm discovery ran, start `claude --debug` and look for the `[gatewayDiscovery]` lines in the debug log at `~/.claude/debug/<session-id>.txt`: Claude Code logs how many models it cached the first time discovery succeeds and again only when the gateway's list changes, and a `404`, timeout, or redirect is recorded there too. For when discovery runs, what it filters, and the response format gateways serve, see the [model discovery reference](/docs/en/llm-gateway-protocol#model-discovery).
308Discovered models appear as additional `/model` entries. Each entry shows the description your gateway supplies for the model, or `From gateway` when it doesn't supply one.
309309
310To confirm discovery ran, start `claude --debug` and look for the `[gatewayDiscovery]` lines in the debug log at `~/.claude/debug/<session-id>.txt`. The first time discovery succeeds, Claude Code logs how many models it cached, and it logs again only when the gateway's list changes. A `404`, timeout, or redirect appears there too. For when discovery runs, what it filters, and the response format gateways serve, see the [model discovery reference](/docs/en/llm-gateway-protocol#model-discovery).
311
310312### Rotate credentials with apiKeyHelper
311313
312314An `apiKeyHelper` is a command Claude Code runs to fetch your gateway credential, instead of reading it from a static environment variable.
from line 384
382384
383385* It disables auto-updates, so plan for another update path, such as your package manager or managed distribution.
384386* It suppresses the [fast mode](/docs/en/fast-mode) availability check. Unless a previous check already enabled fast mode on the machine, `/fast` reports that fast mode is unavailable.
385* It turns off [gateway model discovery](#add-gateway-models-to-the-model-picker), even though discovery queries the gateway itself. Previously discovered models stay available from the local cache, but the list isn't refreshed.
387* It doesn't affect [gateway model discovery](#add-gateway-models-to-the-model-picker), which queries only your gateway. Before v2.1.257, the variable also stopped discovery from refreshing, so the picker kept the previously cached list.
386388* The WebFetch tool's [domain safety check](/docs/en/data-usage#webfetch-domain-safety-check) isn't affected and still calls `api.anthropic.com`. Turn it off separately with `skipWebFetchPreflight: true` in [settings](/docs/en/settings) if your network blocks that host.
387389* For each telemetry stream and the variable that controls it, see [telemetry services](/docs/en/data-usage#telemetry-services).
388390
llm-gateway-protocol Changed · +20 / -10 lines
from line 163
163163
164164* Any `CLAUDE_CODE_USE_*` provider variable is set, even if `ANTHROPIC_BASE_URL` is also set
165165* `ANTHROPIC_BASE_URL` is unset or points at `api.anthropic.com`
166* Nonessential traffic is disabled, through [`CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC`](/docs/en/env-vars) or organization policy
167166
167Discovery still runs when [nonessential traffic is turned off](/docs/en/llm-gateway-connect#turn-off-traffic-outside-the-gateway-path), because the request goes only to your gateway. Before v2.1.257, discovery didn't run while nonessential traffic was turned off.
168
168169### Request and response
169170
170171The request is `GET /v1/models?limit=1000` with a 3-second timeout, and any redirect is treated as failure so the credential can't leak to a redirect target. A gateway that responds slowly or redirects `/v1/models`, even `http` to `https`, fails discovery silently; serve the endpoint directly at the configured base URL.
from line 175
174175* `Authorization`: `ANTHROPIC_AUTH_TOKEN` as a bearer token, otherwise the [`apiKeyHelper`](/docs/en/llm-gateway-connect#rotate-credentials-with-apikeyhelper) value as a bearer token. In that case Claude Code waits for the helper to return before sending the request.
175176* `x-api-key`: the API key Claude Code resolved, such as `ANTHROPIC_API_KEY`. When a helper value is the only credential, this header carries it too, so the value arrives in both headers.
176177
177Claude Code also sends any headers from `ANTHROPIC_CUSTOM_HEADERS`.
178Claude Code also sends any headers from `ANTHROPIC_CUSTOM_HEADERS`. When a custom header has a non-empty value, Claude Code sends it in place of a built-in header of the same name, matching names case-insensitively.
178179
179When neither credential header's value resolves, Claude Code skips discovery and writes a `[gatewayDiscovery] skipped` line to the debug log of a `claude --debug` session.
180When neither credential header's value resolves, Claude Code skips discovery and writes a `[gatewayDiscovery] skipped` line to the debug log of a `claude --debug` session. If you supply a credential only through `ANTHROPIC_CUSTOM_HEADERS`, Claude Code still skips discovery.
180181
181Claude Code reads `id` and the optional `display_name` from each entry in the response's `data` array:
182Claude Code reads `id`, the optional `display_name`, and the optional `description` from each entry in the response's `data` array:
182183
183184```json theme={null}
184185{
185186 "data": [
186 { "id": "claude-sonnet-4-6", "display_name": "Claude Sonnet 4.6" },
187 {
188 "id": "claude-sonnet-4-6",
189 "display_name": "Claude Sonnet 4.6",
190 "description": "Default model for everyday coding tasks"
191 },
187192 { "id": "claude-opus-4-8" }
188193 ]
189194}
from line 198
193198
194199### Picker entries and caching
195200
196The picker is the interactive model list that opens when a developer runs `/model` in Claude Code. Each discovered entry is labeled "From gateway" and uses `display_name` when provided. The [`availableModels` managed setting](/docs/en/settings-reference#availablemodels) bounds what discovery can add.
201The picker is the interactive model list that opens when a developer runs `/model` in Claude Code. Each discovered entry uses `display_name` as its name when the gateway sends one, and the model's `id` otherwise. Discovery adds only models that the [`availableModels` managed setting](/docs/en/settings-reference#availablemodels) allows.
197202
198A discovered ID is skipped when it exactly matches a row already in the picker, or when the discovered and existing IDs are spellings of the same [Fable](/docs/en/model-config#work-with-fable) version. A discovered explicit ID is also folded into a built-in entry when both resolve to the same model. Built-in rows are keyed on aliases such as `sonnet`, so a discovered explicit ID of the model the alias currently resolves to, such as `claude-sonnet-5`, collapses into the `sonnet` row, while an ID the alias doesn't resolve to, such as `claude-sonnet-4-6`, still adds its own "From gateway" row alongside the built-in entry. Before v2.1.197, Claude Code didn't fold explicit IDs into built-in entries, so a discovered ID such as `claude-sonnet-5` added its own "From gateway" row alongside the `sonnet` row.
203Each entry also shows the model's `description`, collapsed to one line. An entry without a `description` reads "From gateway" instead. Before v2.1.257, every discovered entry read "From gateway".
204
205A discovered ID doesn't get its own row when it matches a row already in the picker:
206
207* Same ID: the discovered ID exactly matches an existing row's ID, or the two IDs are spellings of the same [Fable](/docs/en/model-config#work-with-fable) version.
208* Same model as a built-in alias: when a discovered explicit ID names the model that a built-in alias currently resolves to, the picker shows only the alias row. For example, while `sonnet` resolves to `claude-sonnet-5`, a discovered `claude-sonnet-5` collapses into the `sonnet` row, and a discovered `claude-sonnet-4-6` still gets its own row. Before v2.1.197, Claude Code didn't fold these IDs into built-in rows, so `claude-sonnet-5` also got its own "From gateway" row.
199209
200210Results are cached to `~/.claude/cache/gateway-models.json`, or `%USERPROFILE%\.claude\cache\gateway-models.json` on Windows, and refreshed on each startup. If you set [`CLAUDE_CONFIG_DIR`](/docs/en/env-vars), the cache lives under that directory instead. If the request fails or the gateway doesn't implement `/v1/models`, the picker falls back to the cached list from the previous startup or to the built-in model list. If your gateway serves Claude models under aliases that don't match the discovery filter, developers can add those aliases manually with the [model configuration](/docs/en/model-config) variables.
201211
managed-mcp Changed · +10 / -9 lines
from line 166
166166
167167### How a server is evaluated
168168
169Before loading a server, including one from `managed-mcp.json`, Claude Code runs the three checks below in order. In-process `type: "sdk"` servers, which the [app that started the session registers](/docs/en/mcp#how-connectors-reach-claude-code), skip all three.
169Before loading a server, including one from `managed-mcp.json`, Claude Code runs the three checks below in order. It runs them again when a user reconnects a server or turns a disabled one back on in `/mcp`. In-process `type: "sdk"` servers, which the [app that started the session registers](/docs/en/mcp#how-connectors-reach-claude-code), skip all three.
170170
1711711. **Merge the lists.** Allowlist and denylist entries from every settings scope combine into one allowlist and one denylist, with the managed scope's lists coming from the [managed source or sources Claude Code applies](/docs/en/managed-settings#how-claude-code-combines-managed-sources). When `allowManagedMcpServersOnly` is `true`, only the managed allowlist is kept; the denylist always merges from every scope.
1721722. **Check the denylist.** A server that matches any denylist entry, by URL, command, or name, is blocked. Nothing overrides a denylist match.
from line 342
342342
343343For what users see at startup when `managed-mcp.json` is deployed and the session also has `--mcp-config` servers, see [Exclusive control with managed-mcp.json](#exclusive-control-with-managed-mcp-json). Use this table to recognize the other reports and to tell users what to expect before you roll out a change:
344344
345| Restriction | What the user sees |
346| :------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------- |
347| `managed-mcp.json` is present and the user runs `claude mcp add` | `Cannot add MCP server: enterprise MCP configuration is active and has exclusive control over MCP servers` |
348| The server is on a denylist and the user runs `claude mcp add` | `Cannot add MCP server "<name>": server is explicitly blocked by enterprise policy` |
349| The server isn't on the allowlist and the user runs `claude mcp add` | `Cannot add MCP server "<name>": not allowed by enterprise policy` |
350| A previously configured server is now blocked by policy | The server silently disappears from `/mcp` and `claude mcp list` with no warning |
345| Restriction | What the user sees |
346| :-------------------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------- |
347| `managed-mcp.json` is present and the user runs `claude mcp add` | `Cannot add MCP server: enterprise MCP configuration is active and has exclusive control over MCP servers` |
348| The server is on a denylist and the user runs `claude mcp add` | `Cannot add MCP server "<name>": server is explicitly blocked by enterprise policy` |
349| The server isn't on the allowlist and the user runs `claude mcp add` | `Cannot add MCP server "<name>": not allowed by enterprise policy` |
350| A previously configured server is now blocked by policy | The server silently disappears from `/mcp` and `claude mcp list` with no warning |
351| A server becomes blocked while a session is running, and the user selects **Reconnect** or turns it back on in `/mcp` | [`MCP server <name> is blocked by enterprise managed policy`](/docs/en/errors#mcp-server-is-blocked-by-enterprise-managed-policy) |
351352
352In the last case, the user gets no signal that policy is the reason their server disappeared, so tell affected users which servers are blocked when you roll out a new restriction.
353When a server silently disappears, the user gets no signal that policy is the reason, so tell affected users which servers are blocked when you roll out a new restriction.
353354
354355## Monitor MCP usage
355356
permissions Changed · +20 / -5 lines
from line 86
8686
8787## Permission rule syntax
8888
89Permission rules follow the format `Tool` or `Tool(specifier)`.
89Permission rules follow the format `Tool` or `Tool(specifier)`. Parentheses inside the specifier are literal, so a command or path that contains them needs no escaping.
9090
9191### Match all uses of a tool
9292
from line 214
214214 Claude Code is aware of shell operators, so a rule like `Bash(safe-cmd *)` won't give it permission to run the command `safe-cmd && other-cmd`. The recognized command separators are `&&`, `||`, `;`, `|`, `|&`, `&`, and newlines. A rule must match each subcommand independently.
215215</Tip>
216216
217Deny and ask rules apply when any subcommand matches them, including a command nested inside a subshell, a command substitution, or a control-flow body such as a `for` loop. An ask rule like `Bash(git clean *)` still prompts you for `cd /tmp && git clean -f` or `echo "$(git clean -f)"`, even in [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode).
218
217219When `&&` or `||` has nothing after it, such as in `npm test &&`, Claude Code treats the command as unparseable and doesn't split it into subcommands for allow-rule matching, so a rule such as `Bash(npm *)` doesn't approve it.
218220
219221When you approve a compound command with "Yes, and don't ask again", Claude Code saves a separate rule for each subcommand that requires approval, rather than a single rule for the full compound string. For example, approving `git status && npm test` saves a rule for `npm test`, so future `npm test` invocations are recognized regardless of what precedes the `&&`. Subcommands like `cd` into a subdirectory generate their own Read rule for that path. Up to 5 rules may be saved for a single compound command.
from line 250
248250* **Network paths on Windows**: a command whose arguments include a network (UNC) path, such as `\\server\share\file`, prompts because accessing a network path can send your Windows credentials to the host it names. The same check applies to [PowerShell tool](/docs/en/tools-reference#powershell-tool) commands.
249251* **Commands the analysis can't parse**: when Claude Code can't fully parse a command, it asks for approval instead of treating the command as read-only. Commands longer than 10,000 characters always prompt because they exceed what the analysis parses.
250252
251A `cd` into a path inside your working directory or an [additional directory](#working-directories) is also read-only, and a compound command like `cd packages/api && ls` runs without a prompt when each part qualifies on its own. Two combinations prompt even when each part is read-only:
253A `cd` into a path inside your working directory or an [additional directory](#working-directories) is also read-only, and a compound command like `cd packages/api && ls` runs without a prompt when each part qualifies on its own. These combinations prompt even when each part is read-only:
252254
253255* **`cd` with `git`**: prompts when the `cd` changes into a different directory, since running `git` in a new directory can execute that directory's hooks. A `cd` whose target resolves to the current working directory is a no-op and doesn't trigger the prompt.
254* **`cd` with an output redirect**: prompts when Claude Code can't determine which directory the redirect target resolves against after the `cd` runs. A command whose only redirect target is `/dev/null`, such as `cd app; grep -r pattern . 2>/dev/null`, doesn't prompt, because `/dev/null` doesn't depend on the working directory.
256* **`cd` with a redirect**: prompts when Claude Code can't determine which directory the redirect target resolves against after the `cd` runs. A command whose only redirect target is `/dev/null`, such as `cd app; grep -r pattern . 2>/dev/null`, doesn't prompt, because `/dev/null` doesn't depend on the working directory.
255257
256258<Warning>
257259 Bash permission patterns that try to constrain command arguments are fragile. For example, `Bash(curl http://github.com/ *)` intends to restrict curl to GitHub URLs, but won't match variations like:
from line 275
273275
274276#### Redirections
275277
276Claude Code checks the target of an output redirection, such as `>`, `>>`, or `2>`, as a file write. The check covers your `Edit` allow and deny rules, [protected paths](/docs/en/permission-modes#protected-paths), and the [working directories](#working-directories). A rule such as `Bash(git commit *)` allows the command, not the target. A `/dev/null` target isn't checked. A target that starts with `~` or contains a glob character needs approval.
278When a command redirects output or input, Claude Code checks the redirect target against your file rules as if Claude wrote or read that file directly:
277279
280* **Output redirects**: for `> file`, `>> file`, or `2> file`, the check covers your `Edit` allow and deny rules, [protected paths](/docs/en/permission-modes#protected-paths), and the [working directories](#working-directories). A rule such as `Bash(git commit *)` allows the command, not the target. A target that starts with `~` or contains a glob character needs your approval.
281* **Input redirects**: for `< file`, the check covers your `Read` allow and deny rules and the working directories. A target outside the working directories needs your approval unless an allow rule covers it. A target that contains a glob pattern, or a relative path that follows a `cd` in the same command, needs your approval even when an allow rule covers it. Claude Code checks input targets in v2.1.257 and later.
282
283Targets with no file behind them aren't checked: `/dev/null`, file-descriptor forms such as `2>&1` and `<&3`, and here-docs and here-strings.
284
278285### PowerShell
279286
280287PowerShell permission rules use the same shape as Bash rules. Wildcards with `*` match at any position, the `:*` suffix is equivalent to a trailing ` *`, and a bare `PowerShell` or `PowerShell(*)` matches every command. This configuration allows `Get-ChildItem` and `git commit` commands while blocking `Remove-Item`:
from line 315
308315Claude Code checks file permissions against `Edit(path)` and `Read(path)` rules only. If you write a path rule for `Write`, `NotebookEdit`, `Glob`, or the legacy `MultiEdit` tool instead, Claude Code accepts the rule but never consults it, and [warns at startup](/docs/en/errors#is-not-matched-by-file-permission-checks), except for a `Glob` rule passed in `--allowedTools`. Use `Edit(docs/**)` in place of `Write(docs/**)`, `NotebookEdit(docs/**)`, or `MultiEdit(docs/**)`, and `Read(docs/**)` in place of `Glob(docs/**)`. Claude Code doesn't warn about a tool-name rule with no path, such as a deny rule for `Write`; it matches that rule at the tool level everywhere. Requires Claude Code v2.1.210 or later.
309316
310317<Warning>
311 Read and Edit deny rules apply to Claude's built-in file tools and to file commands Claude Code recognizes in Bash, such as `cat`, `head`, `tail`, and `sed`. They don't apply to arbitrary subprocesses that read or write files indirectly, like a Python or Node script that opens files itself. For OS-level enforcement that blocks all processes from accessing a path, [enable the sandbox](/docs/en/sandboxing).
318 Read and Edit deny rules apply to Claude's built-in file tools, to file commands Claude Code recognizes in Bash, such as `cat`, `head`, `tail`, and `sed`, and to the targets of Bash [redirections](#redirections) such as `> file` and `< file`. They don't apply to arbitrary subprocesses that read or write files indirectly, like a Python or Node script that opens files itself. For OS-level enforcement that blocks all processes from accessing a path, [enable the sandbox](/docs/en/sandboxing).
312319</Warning>
313320
314321Read and Edit rules both use [gitignore](https://git-scm.com/docs/gitignore) pattern syntax with four distinct pattern types; for single-segment directory patterns, the matching depth also depends on the rule type, described later in this section:
from line 395
388395
389396When you approve a file path with "Yes, and don't ask again", Claude Code escapes gitignore pattern characters in that path, such as `[`, `]`, and `*`, so the generated rule matches only the literal path you approved. Rules you write yourself aren't escaped. Before v2.1.202, Claude Code saved the path unescaped, so a generated rule for a directory named `[2024-06] Reports` could fail to match its own path or match unintended sibling directories.
390397
398You don't need to escape parentheses in a path, so `Edit(./Finance (2024)/**)` matches the `Finance (2024)` folder as spelled.
399
400A deny or ask rule whose path isn't usable as a gitignore pattern still guards that exact path. An allow rule with an unusable pattern doesn't approve anything.
401
391402When Claude accesses a symlink, permission rules check two paths: the symlink itself and the file it resolves to. Allow and deny rules treat that pair differently: allow rules fall back to prompting you, while deny rules block outright.
392403
393404* **Allow rules**: apply only when both the symlink path and its target match. A symlink inside an allowed directory that points outside it still prompts you.
from line 511
500511
501512Files in additional directories follow the same permission rules as the original working directory: they become readable without prompts, and file editing permissions follow the current permission mode.
502513
514You can't add most [network paths](/docs/en/errors#working-directory-is-a-network-path), such as the UNC share `\\server\share`, as working directories, because looking one up can contact the host it names. On Windows, map the share to a drive letter instead and pass the drive with `--add-dir` at launch.
515
503516Set [`permissions.blockReadsOutsideWorkingDirectories`](/docs/en/settings-reference#permissions-blockreadsoutsideworkingdirectories) to make the file tools refuse the paths it fences in every permission mode. In auto mode, Claude Code offers to turn it on the first time Claude [reads outside the working directories](/docs/en/permission-modes#first-read-outside-the-working-directories).
504517
505518In background sessions on macOS, the session host requests access to protected folders such as `~/Desktop`, `~/Documents`, and `~/Downloads` separately from your terminal when Claude needs to read or write files there; if reads there fail with `Operation not permitted`, see [how to grant folder access to background sessions](/docs/en/agent-view#background-sessions-can’t-read-desktop-documents-or-downloads-on-macos).
from line 551
538551| [Subagents](/docs/en/sub-agents) in `.claude/agents/` | Yes, without live reload |
539552| [Settings](/docs/en/settings) in `.claude/settings.json` and `.claude/settings.local.json` | `enabledPlugins` and [`extraKnownMarketplaces`](/docs/en/settings-reference#extraknownmarketplaces) keys only |
540553| [CLAUDE.md](/docs/en/memory) files, `.claude/rules/`, and `CLAUDE.local.md` | Only when `CLAUDE_CODE_ADDITIONAL_DIRECTORIES_CLAUDE_MD=1` is set. `CLAUDE.local.md` additionally requires the `local` setting source, which is enabled by default |
554
555To load the skills, commands, and subagents from a subdirectory of your [primary working directory](#working-directories) mid-session, run `/add-dir` with that subdirectory's path. Claude Code loads them for the rest of the session without prompting you or adding a working directory, because the subdirectory is already readable. This requires Claude Code v2.1.257 or later.
541556
542557Claude Code discovers output styles from the current working directory and its parents, your user directory at `~/.claude/`, and managed settings. Hooks and other `.claude/settings.json` keys load from the current working directory's `.claude/` folder with no parent-directory fallback, alongside your user `~/.claude/settings.json` and managed settings. `.claude/settings.local.json` loads from the git repository root instead, even when you start Claude Code in a subdirectory, except in the cases where Claude Code [doesn't use the repository root](/docs/en/settings#where-claude-code-looks-for-each-file), such as on Windows; before v2.1.211, it too loaded only from the current working directory. [Agent SDK](/docs/en/agent-sdk/claude-code-features#control-filesystem-settings-with-settingsources) sessions load it from the working directory in all versions.
543558
remote-control Changed · +3 / -2 lines
from line 372
372372
373373### "Remote Control is disabled by your organization's policy"
374374
375A policy blocks Remote Control. Check these causes in order:
375A policy blocks Remote Control, or Claude Code couldn't load your organization's policy on this machine and keeps Remote Control off in the meantime. Check these causes in order:
376376
377377* **The error mentions `disableRemoteControl`**: your IT administrator has disabled Remote Control on this device through [managed settings](/docs/en/managed-settings), independent of the organization-wide toggle and of how you're signed in.
378378* **Your claude.ai plan is Pro or Max**: Claude Code is still signed in under a Team or Enterprise organization from an earlier login, so it checks that organization's Remote Control policy. Run `/status` to see which plan and organization your sign-in uses. Run `claude auth logout` then `claude auth login` to sign in again under your current plan.
379* **Otherwise, an Owner hasn't enabled it for your organization**: this form appears when you're signed in with an eligible claude.ai account but Remote Control is off, the default on Team and Enterprise plans. An Owner can enable it at [claude.ai/admin-settings/claude-code](https://claude.ai/admin-settings/claude-code) by turning on the **Remote Control** toggle. This toggle is a server-side organization setting.
379* **The organization policy didn't load on this machine**: run `claude doctor` and read the `Organization policy` line. If the line shows the policy isn't loaded, that is what's keeping Remote Control off. Before v2.1.261, `claude doctor` didn't print this line.
380* **Otherwise, an Owner hasn't enabled it for your organization**: Remote Control is off by default on Team and Enterprise plans. An Owner can enable it at [claude.ai/admin-settings/claude-code](https://claude.ai/admin-settings/claude-code) by turning on the **Remote Control** toggle. This toggle is a server-side organization setting.
380381
381382### "Remote Control isn't available for your organization due to its compliance policy"
382383
settings-reference Changed · +11 / -17 lines
This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.
from line 677
677677| [`includeGitInstructions`](#includegitinstructions) | Remove the built-in commit and PR instructions from the [system prompt](/docs/en/sub-agents#what-loads-at-startup) | Git and attribution | Any file |
678678| [`inputNeededNotifEnabled`](#inputneedednotifenabled) | Get a [push notification](/docs/en/remote-control#mobile-push-notifications) when Claude is waiting on you | Remote, desktop, and notifications | Any file |
679679| [`isolatePeerMachines`](#isolatepeermachines) | Ask you before Claude [messages one of your sessions on another machine](/docs/en/cross-session-messaging#require-approval-for-cross-machine-messages) | Agents, sessions, and worktrees | Any file |
680| [`keybindingFlavor`](#keybindingflavor) | Make `Ctrl+W` [delete back to the previous whitespace](/docs/en/interactive-mode#make-ctrl-w-delete-back-to-whitespace), as Bash does | Interface and terminal | Any file |
680| [`keybindingFlavor`](#keybindingflavor) | Deprecated and has no effect; the word-editing shortcuts always [follow readline conventions](/docs/en/interactive-mode#make-ctrl-w-delete-back-to-whitespace) | Interface and terminal | Any file |
681681| [`language`](#language) | Have Claude respond in a language other than English | Model and responses | Any file |
682682| [`managedSourcesBehavior`](#managedsourcesbehavior) | Compose every [managed source](/docs/en/managed-settings#how-claude-code-combines-managed-sources) you deploy instead of using the highest-priority one alone | Enterprise and managed settings | Managed |
683683| [`minimumVersion`](#minimumversion) | Keep [auto-updates](/docs/en/setup#pin-a-minimum-version) from installing anything below a version | Updates and versioning | Any file |
from line 1438
14381438
14391439### `permissions.deny`
14401440
1441List the tool uses Claude Code blocks. Use it for files that hold API keys, secrets, or environment values: Claude Code excludes matching files from file discovery and search results, denies reads of them, and blocks the [Edit and Write tools](/docs/en/permissions#read-and-edit) on the matching paths. Read and Edit deny rules apply to Claude's built-in file tools and to file commands Claude Code recognizes in Bash, such as `cat`, `head`, `tail`, and `sed`; they don't apply to arbitrary subprocesses, so for OS-level enforcement [enable the sandbox](/docs/en/sandboxing).
1441List the tool uses Claude Code blocks. Use it for files that hold API keys, secrets, or environment values: Claude Code excludes matching files from file discovery and search results, denies reads of them, and blocks the [Edit and Write tools](/docs/en/permissions#read-and-edit) on the matching paths. Read and Edit deny rules apply to Claude's built-in file tools, to file commands Claude Code recognizes in Bash, such as `cat`, `head`, `tail`, and `sed`, and to the targets of Bash [redirections](/docs/en/permissions#redirections) such as `> file` and `< file`; they don't apply to arbitrary subprocesses, so for OS-level enforcement [enable the sandbox](/docs/en/sandboxing).
14421442
14431443* **Scope**: [`Any file`](#scopes)
14441444* **Type**: array of permission rule strings
from line 3071
30713071
30723072### `keybindingFlavor`
30733073
3074Choose which convention `Ctrl+W` follows in the prompt input. Set it to `"readline"` to make `Ctrl+W` delete back to the previous whitespace, as Bash does, so a path or a `--flag=value` goes in one press. Requires Claude Code v2.1.238 or later.
3074<Warning>
3075 Deprecated since v2.1.261 and has no effect. The prompt's word-editing keys always [follow readline conventions](/docs/en/interactive-mode#make-ctrl-w-delete-back-to-whitespace), as in Bash. Claude Code still accepts `keybindingFlavor`, so a settings file that sets it stays valid.
3076</Warning>
30753077
3078In v2.1.238 through v2.1.260, setting it to `"readline"` made `Ctrl+W` delete back to the previous whitespace instead of only the previous word.
3079
30763080* **Scope**: [`Any file`](#scopes)
3077* **Type**: string, one of:
3078 * `"classic"`: `Ctrl+W` deletes the previous word
3079 * `"readline"`: `Ctrl+W` deletes back to the previous whitespace
3080* **Default**: `"classic"`
3081* **Type**: string, `"classic"` or `"readline"`
3082* **Default**: unset
30813083
3082```json settings.json theme={null}
3083{
3084 "keybindingFlavor": "readline"
3085}
3086```
3087
3088See [Make editing keys follow readline conventions](/docs/en/interactive-mode#make-ctrl-w-delete-back-to-whitespace) for the per-key behavior.
3089
30903084### `prefersReducedMotion`
30913085
30923086Reduce or turn off interface animations such as the spinner, shimmer, and flash effects. Appears in `/config` as **Reduce motion**.
from line 3299
33053299
33063300### `statusLine`
33073301
3308Run your own command to render a [status line](/docs/en/statusline) below the prompt with context such as the model, cost, or git branch. Optional fields adjust spacing, add perio
3302Run your own command to render a [status line](/docs/en/statusline) below the prompt with context such as the model, cost, or git branch. Optional fields adjust spacing, add periodic re-runs, an
accessibility Changed · +1 / -1 lines
from line 78
7878
7979When you delete a word or a line with one of the [text editing shortcuts](/docs/en/interactive-mode#text-editing), Claude Code announces the deleted text:
8080
81* Deleting a word with `Ctrl+W`, `Option+Delete` on macOS, or `Ctrl+Backspace` on Windows
81* Deleting words with `Ctrl+W` or `Alt+D`, or with `Option+Delete` on macOS or `Ctrl+Backspace` on Windows
8282* Deleting to the start of the line with `Ctrl+U` or `Cmd+Backspace`
8383* Deleting to the end of the line with `Ctrl+K`
8484
cli-reference Changed · +1 / -1 lines
from line 53
5353
5454| Flag | Description | Example |
5555| :---------------------------------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------------------------- |
56| `--add-dir` | Add additional working directories for Claude to read and edit files. Grants file access; most `.claude/` configuration is [not discovered](/docs/en/permissions#additional-directories-grant-file-access-not-configuration) from these directories. Validates each path exists as a directory. To persist these directories across sessions, set [`permissions.additionalDirectories`](/docs/en/settings-reference#permissions-additionaldirectories) in settings | `claude --add-dir ../apps ../lib` |
56| `--add-dir` | Add additional working directories for Claude to read and edit files. Grants file access; Claude Code [doesn't discover](/docs/en/permissions#additional-directories-grant-file-access-not-configuration) most `.claude/` configuration from these directories. Validates that each path exists as a directory. You can't add most [network paths](/docs/en/errors#working-directory-is-a-network-path), such as `\\server\share`. To persist these directories across sessions, set [`permissions.additionalDirectories`](/docs/en/settings-reference#permissions-additionaldirectories) in settings | `claude --add-dir ../apps ../lib` |
5757| `--advisor <model>` | Enable the server-side [advisor tool](/docs/en/advisor) for this session with a model alias, `fable`, `opus`, or `sonnet`, or a full model ID. Takes precedence over the `advisorModel` setting for the session. `fable` requires [Fable access](/docs/en/advisor#choose-an-advisor-model) | `claude --advisor opus` |
5858| `--agent` | Specify an agent for the current session (overrides the `agent` setting) | `claude --agent my-custom-agent` |
5959| `--agents` | Define custom subagents dynamically via JSON. Accepts the [fields listed for CLI-defined subagents](/docs/en/sub-agents#choose-the-subagent-scope). Claude Code validates the JSON at startup and exits on an invalid value; see [`Invalid --agents configuration`](/docs/en/errors#invalid-agents-configuration) for the message and for the flags and environment variable that skip the validation. Validation requires Claude Code v2.1.242 or later | `claude --agents '{"reviewer":{"description":"Reviews code","prompt":"You are a code reviewer"}}'` |
commands Changed · +1 / -1 lines
from line 45
4545
4646| Command | Purpose |
4747| :-------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
48| `/add-dir <path>` | Add a working directory for file access during the current session. Type a partial path to see matching directory suggestions; press `Tab` to accept one. Most `.claude/` configuration is [not discovered](/docs/en/permissions#additional-directories-grant-file-access-not-configuration) from the added directory. A successful add runs your [`DirectoryAdded` hooks](/docs/en/hooks#directoryadded). When you run it while Claude is responding, Claude Code asks you to confirm the directory right away, and once you confirm, Claude's next tool call in the same turn can access it. Before v2.1.234, Claude Code queued the command until the turn finished |
48| `/add-dir <path>` | Add a working directory for file access during the current session. Type a partial path to see matching directory suggestions; press `Tab` to accept one. Most `.claude/` configuration [isn't discovered](/docs/en/permissions#additional-directories-grant-file-access-not-configuration) from the added directory. You can't add most [network paths](/docs/en/errors#working-directory-is-a-network-path), such as `\\server\share`. After a successful add, your [`DirectoryAdded` hooks](/docs/en/hooks#directoryadded) run. When you run it while Claude is responding, Claude Code asks you to confirm the directory right away, and once you confirm, Claude's next tool call in the same turn can access it. Before v2.1.234, Claude Code queued the command until the turn finished |
4949| `/advisor [model\|off]` | Enable or disable the [advisor tool](/docs/en/advisor), which consults a second model for guidance at key moments during a task. Accepts `fable`, `opus`, `sonnet`, or a full model ID. `fable` requires [Fable access](/docs/en/advisor#choose-an-advisor-model). Without an argument, opens a picker |
5050| `/agents` | As of v2.1.198, running `/agents` prints a reminder to ask Claude to create or manage [subagents](/docs/en/sub-agents), or to edit `.claude/agents/` or `~/.claude/agents/` directly. On v2.1.197 and earlier, opens an interactive interface for creating and managing subagent configurations |
5151| `/artifacts` | List the [artifacts](/docs/en/artifacts#find-an-artifact-again) you own or that are shared with you, then attach one to the session, open it in your browser, or copy its link. Available where [artifacts](/docs/en/artifacts#availability) are. Requires Claude Code v2.1.208 or later; attaching with `Enter` requires v2.1.216 |
deep-links Changed · +1 / -1 lines
from line 49
4949| Parameter | Description |
5050| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
5151| `q` | Text to pre-fill in the prompt box. [URL-encode](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent) the value. Use `%0A` for line breaks in multi-line prompts. Maximum 5,000 characters. |
52| `cwd` | Absolute path to use as the working directory. Network and UNC paths are rejected, and so are paths that contain invisible or bidirectional control characters. |
52| `cwd` | Absolute path to use as the working directory. Network and UNC paths are rejected, and so are paths that contain `..` segments or invisible or bidirectional control characters. |
5353| `repo` | A GitHub `owner/name` slug. Claude Code resolves it to a local clone it has seen before and starts there. If you have no matching clone, the session opens in your home directory instead. |
5454
5555`cwd` and `repo` are [two ways to set the working directory](#choose-between-cwd-and-repo). If you pass both, `cwd` takes precedence and `repo` is ignored, even if the `cwd` path does not exist.
hooks Changed · +1 / -1 lines
This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.
from line 2746
27462746
27472747* You pass a directory with the `--add-dir` startup flag; [SessionStart](#sessionstart) covers those directories
27482748* You add a directory on the `/permissions` Workspace tab
2749* You add a directory that is already a working directory; the add fails with an error
2749* You add a directory that is already a working directory or inside one
27502750
27512751Claude Code fires DirectoryAdded after refreshing sandbox and permission state, so sandboxed tools already see the new directory when your hook runs. Hook commands themselves run unsandboxed.
27522752
from line 2813
28132813}
28142814```
28152815
2816The hook reads the changed file's absolute path from the `file_path` field of the [JSON input](#filechanged-input) on stdin. Its `grep` guard tests for the same thing `perl` remo
2816The hook reads the changed file's absolute path from the `file_path` field of the [JSON input](#filechanged-input) on stdin. Its `grep` guard tests for the same thing `perl` removes, a CR at th
large-codebases Changed · +1 / -1 lines
from line 172
172172}
173173```
174174
175Deny rules cover Claude's built-in file tools and recognized Bash file commands, including `cat`, `head`, `grep`, and `find`, when a denied path is passed as an argument. Claude Code also makes a best-effort attempt to leave denied paths out of the results of the built-in Grep and Glob tools. Claude still sees denied paths in the output of a Bash search such as `grep -r` or `find`.
175Deny rules cover Claude's built-in file tools. In Bash, they cover the file commands Claude Code recognizes, such as `cat`, `head`, `grep`, and `find`, when a denied path appears as an argument, and the target of a [redirection](/docs/en/permissions#redirections) such as `< file`. Claude Code also makes a best-effort attempt to leave denied paths out of the results of the built-in Grep and Glob tools. A Bash search such as `grep -r` or `find` over a directory that contains denied files still includes them in its output.
176176
177177Deny rules don't cover subprocesses that open files themselves. For the full pattern syntax, see [Read and Edit permission rules](/docs/en/permissions#read-and-edit).
178178
managed-settings Changed · +2 / -0 lines
from line 359
359359
360360<Note>
361361 On Team and Enterprise plans, an Owner enables or disables [Remote Control](/docs/en/remote-control) and [web sessions](/docs/en/claude-code-on-the-web) organization-wide in [Claude Code admin settings](https://claude.ai/admin-settings/claude-code). Remote Control can additionally be disabled per device with the [`disableRemoteControl`](/docs/en/settings-reference#disableremotecontrol) setting. Web sessions have no per-device managed settings key.
362
363 To check whether these organization settings reached a given machine, run `claude doctor` there and read the `Organization policy` line, which says where Claude Code loaded the policy from or why it didn't load. Requires Claude Code v2.1.261 or later. In a running session, `/status` shows the same line when the policy didn't load.
362364</Note>
363365
364366## Turn telemetry off for your organization
mcp Changed · +2 / -0 lines
from line 227
227227/mcp
228228```
229229
230When you remove a remote server, Claude Code also deletes the OAuth tokens and client registration it stored for that server.
231
230232#### Server status
231233
232234`claude mcp add` confirms a successful add by printing an `Added ...` line, which means the configuration was written. `claude mcp list` then shows a health status next to each server it lists, such as `✔ Connected`, `! Needs authentication`, or `✘ Failed to connect`. A failure status means Claude Code couldn't connect to that server, not that the list command failed.
plugins-reference Changed · +3 / -1 lines
from line 822
822822
823823### Path traversal limitations
824824
825Claude Code doesn't let a plugin reference files outside its own directory. It rejects a component path that resolves outside the plugin root, such as `../shared-utils`, whether the path is declared in `plugin.json` or in a [marketplace entry](/docs/en/plugin-marketplaces#plugin-entries). Claude Code reports a [`path escapes plugin directory`](/docs/en/errors#path-escapes-plugin-directory) error and loads the plugin without that component.
825Claude Code doesn't let a plugin reference files outside its own directory. It rejects a component path that resolves outside the plugin root, whether the path is declared in `plugin.json` or in a [marketplace entry](/docs/en/plugin-marketplaces#plugin-entries). That covers a path that points outside the plugin as written, such as `../shared-utils`, and a symlink that leads outside the plugin, other than [links within one marketplace](#share-files-within-a-marketplace-with-symlinks).
826
827When Claude Code rejects a path, it reports a [`path escapes plugin directory`](/docs/en/errors#path-escapes-plugin-directory) error and loads the plugin without that component.
826828
827829Claude Code also doesn't copy files outside the plugin directory into the cache when it installs the plugin, so when a script inside a copied plugin reads a path above the plugin root, it doesn't find those files either.
828830
skills Changed · +3 / -1 lines
from line 160
160160
161161Project skills load from `.claude/skills/` in the directory where you start Claude Code and in every parent directory up to the repository root. Starting Claude in a subdirectory still picks up skills defined at the root. To load skills from a directory outside that path at startup, pass it with [`--add-dir`](/docs/en/cli-reference). Claude Code reads `.claude/skills/` inside each added directory alongside the project skills. When you [move the session with `/cd`](/docs/en/permissions#move-the-session-to-another-directory) on v2.1.246 or later, Claude Code adds the new directory's project skills.
162162
163Skills in nested `.claude/skills/` directories below your starting directory aren't loaded at startup. They load the first time Claude reads or edits a file inside that subdirectory, and stay available for the rest of the session. For example, after Claude edits a file under `packages/frontend/`, skills in `packages/frontend/.claude/skills/` become available. Until then, those skills don't appear in autocomplete and can't be invoked by name.
163Skills in nested `.claude/skills/` directories below your starting directory don't load at startup. They load the first time Claude reads or edits a file in the subdirectory that contains them, and stay available for the rest of the session. For example, after Claude edits a file under `packages/frontend/`, skills in `packages/frontend/.claude/skills/` become available. Until then, those skills don't appear in autocomplete, and you can't invoke them by name.
164
165To load a subdirectory's skills before Claude reads or edits a file there, run `/add-dir` with that subdirectory's path. This requires Claude Code v2.1.257 or later.
164166
165167<Note>
166168 Files in `.claude/commands/` support the same [frontmatter](#frontmatter-reference), except `name` and `paths`, which Claude Code ignores in a command file. You invoke a command file by its file name. Skills are recommended since they support additional features like [supporting files](#add-supporting-files).
sub-agents Changed · +1 / -1 lines
from line 271
271271For Bash commands, Claude Code also checks the command itself in two ways:
272272
273273* It blocks a command that redirects git into the main checkout.
274* It refuses a command whose shape it can't verify stays inside the worktree. This refusal applies even to a command that runs no git.
274* It refuses a command when it can't verify from the command text that any git the command runs stays inside the worktree, for example when the command name is computed at runtime.
275275
276276The redirect vectors and the shape rules are listed under [How Claude Code enforces isolation](/docs/en/worktrees#how-claude-code-enforces-isolation). PowerShell commands get only the working-directory check.
277277
terminal-config Changed · +1 / -1 lines
from line 306
306306
307307When you paste more than 800 characters or more than three lines into the prompt, Claude Code collapses the input to a placeholder such as `[Pasted text #1 +120 lines]` so the input box stays usable. In a terminal window shorter than 12 rows the line limit drops, so Claude Code collapses a three-line paste at 11 rows and any multi-line paste at 10 rows or fewer. Claude Code still sends the full content when you submit.
308308
309When you delete with a word or line shortcut such as `Ctrl+W` or `Ctrl+K`, or with a vim delete through an `f`/`t` motion such as `df]`, and the deleted range reaches inside a placeholder, Claude Code removes the placeholder whole. You can paste the deletion back to restore it, with [`Ctrl+Y`](/docs/en/interactive-mode#text-editing) after `Ctrl+W`, `Ctrl+U`, or `Ctrl+K`, or with [`p` in NORMAL mode](/docs/en/interactive-mode#editing-normal-mode) after a vim delete.
309When you delete with a word or line shortcut such as `Ctrl+W` or `Ctrl+K`, or with a vim delete through an `f`/`t` motion such as `df]`, and the deleted range reaches inside a placeholder, Claude Code removes the placeholder whole. You can paste the deletion back to restore it, with [`Ctrl+Y`](/docs/en/interactive-mode#text-editing) after a word or line shortcut, or with [`p` in NORMAL mode](/docs/en/interactive-mode#editing-normal-mode) after a vim delete.
310310
311311Claude Code keeps the collapsed content under `~/.claude/paste-cache/`, so when you recall a prompt from [command history](/docs/en/interactive-mode#command-history) and resubmit it, Claude Code sends the full pasted content again, including in a later session, until the retention sweep removes the cache file.
312312
tools-reference Changed · +1 / -1 lines
from line 227
227227
228228Viewing a file with Bash also satisfies the read-before-edit requirement when the command is `cat`, `nl`, `bat`, `batcat`, `head`, `tail`, `sed -n 'X,Yp'`, `grep`, `egrep`, `fgrep`, or `rg` on a single file with no pipes or redirects. Piped output and other Bash commands don't count toward the read-before-edit check.
229229
230This affects edit eligibility only, not permissions. [Read and Edit deny rules](/docs/en/permissions#tool-specific-permission-rules) also apply to file commands Claude Code recognizes in Bash, such as `cat`, `head`, `tail`, `sed`, and `grep`, but not to arbitrary subprocesses that read or write files indirectly, like a Python or Node script that opens files itself. The set of commands recognized for deny rules is not the same as the read-before-edit list above: for example, `egrep` and `fgrep` count for read-before-edit but are not checked against Read deny rules. For OS-level enforcement that covers every process, [enable the sandbox](/docs/en/sandboxing).
230Viewing a file with Bash affects edit eligibility only, not permissions. See [Read and Edit permission rules](/docs/en/permissions#read-and-edit) for which Bash commands your `Read` and `Edit` deny rules cover.
231231
232232## EndConversation tool behavior
233233
worktrees Changed · +1 / -1 lines
from line 85
8585* **File edits**: Claude Code blocks an `Edit`, `Write`, or `NotebookEdit` that targets a path in the main checkout.
8686* **Command working directory**: Claude Code blocks a Bash, PowerShell, or Monitor command whose working directory resolves to the main checkout, or whose working directory it can't verify stays outside it.
8787* **Git redirects**: Claude Code blocks a Bash or Monitor command that redirects git into the main checkout. The redirect can come through `git -C`, `--git-dir`, a `GIT_DIR` or `GIT_WORK_TREE` variable, or a `cd` into the main checkout before running git.
88* **Command shape**: Claude Code blocks a Bash or Monitor command it can't verify stays inside the worktree, even when the command runs no git at all. Claude Code refuses shell constructs it can't trace without running them, such as brace expansion and heredocs with unquoted delimiters. Claude Code tells Claude how to rewrite the refused command, such as splitting it into plain, separate commands. You can't turn this check off.
88* **Command shape**: Claude Code blocks a Bash or Monitor command when it can't verify from the command text that any git the command runs stays inside the worktree, for example when the command name is computed at runtime or the syntax can't be parsed. Claude Code tells Claude how to rewrite the refused command, such as splitting it into plain, separate commands. You can't turn this check off.
8989
9090The checks apply to the repository you launched Claude Code from. They also cover the main checkout a linked worktree is linked from. For PowerShell commands, Claude Code applies only the working-directory check.
9191