Environment variables changedenv-vars
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202202| `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 |
203203| `CLAUDE_CODE_API_KEY_HELPER_TTL_MS` | Interval in milliseconds at which credentials should be refreshed (when using [`apiKeyHelper`](/docs/en/settings#available-settings)) |
204204| `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 |
205| `CLAUDE_CODE_ARTIFACT_COMMENTS` | Set to `1` to let Claude read and reply to [comments on an artifact](/docs/en/artifacts#collect-comments-on-an-artifact) when [feature-flag fetching](#features-that-need-feature-flag-fetching) is off. Set to `0` to turn comment reading and replying off even when fetching is on. 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 |
206| `CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT` | Set to `1` to let Claude [reply on its own to comments sent to it](/docs/en/artifacts#let-claude-reply-to-comments-on-its-own) when [feature-flag fetching](#features-that-need-feature-flag-fetching) is off, or `0` to turn that off even when fetching is on. Needs comment reading on as well. Requires Claude Code v2.1.228 or later |
205207| `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 |
206208| `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. 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 |
207209| `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#global-config-settings) global config setting |
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338340| `CLAUDE_CODE_SHELL_PREFIX` | Command prefix that wraps shell commands Claude Code spawns: Bash tool calls, [hook](/docs/en/hooks) commands, [status line](/docs/en/statusline) commands, and stdio [MCP server](/docs/en/mcp) startup commands. PowerShell hooks and exec-form hooks run without the prefix. Useful for logging or auditing. Setting a bare executable path such as `/path/to/logger.sh` runs each command as `/path/to/logger.sh '<command>'`. The wrapper receives the command line as a single shell-quoted argument in `$1`, so the wrapper must re-evaluate `$1` with a shell, for example `exec bash -c "$1"`. Treating `$1` as a bare executable path breaks stdio MCP servers that pass arguments such as `npx -y <package>`. For Bash tool calls, `$1` contains the full shell invocation Claude Code assembles, including environment setup, not only the command Claude ran |
339341| `CLAUDE_CODE_SIMPLE` | Set to `1` to run with a minimal system prompt and only the Bash, file read, and file edit tools. MCP tools from `--mcp-config` are still available. Disables auto-discovery of hooks, skills, plugins, MCP servers, auto memory, and CLAUDE.md. OAuth tokens and keychain credentials are not read, so Anthropic authentication must come from `ANTHROPIC_API_KEY` or an `apiKeyHelper` in `--settings`. Equivalent to passing [`--bare`](/docs/en/headless#start-faster-with-bare-mode) |
340342| `CLAUDE_CODE_SIMPLE_SYSTEM_PROMPT` | Set to `1` to use a shorter system prompt and abbreviated tool descriptions on any model. Set to `0`, `false`, `no`, or `off` to opt out even on models where the experiment or server configuration would otherwise enable it. The full tool set, hooks, MCP servers, and CLAUDE.md discovery remain enabled |
341| `CLAUDE_CODE_SKIP_ANTHROPIC_AWS_AUTH` | Skip client-side authentication for [Claude Platform on AWS](/docs/en/claude-platform-on-aws), for gateways that sign requests themselves |
342| `CLAUDE_CODE_SKIP_AWS_CRED_CACHE` | Set to `1` to turn off the in-process cache of credentials resolved from the AWS default credential provider chain, so Claude Code resolves the chain on every API request. With the cache off, an SSO-backed profile requests credentials from IAM Identity Center on every request. See [credential caching and resolution timeout](/docs/en/amazon-bedrock#credential-caching-and-resolution-timeout). Requires Claude Code v2.1.207 or later |
343| `CLAUDE_CODE_SKIP_BEDROCK_AUTH` | Skip AWS authentication for Amazon Bedrock (for example, when using an LLM gateway)
343| `CLAUDE_CODE_SKIP_ANTHROPIC_AWS_AUTH` | Skip client-side authentication for [Claude Platform on AWS](/docs/en/claude-platform-on-aws), for gateways that sign requests themselves
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