Environment variables changedenv-vars
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243243| `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 |
244244| `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 |
245245| `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 |
246| `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 |
246247| `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 |
247248| `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 |
248249| `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 5 since it cannot 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 |
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339340| `CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS` | Set to `1` to treat a failed [fast mode](/docs/en/fast-mode#use-fast-mode-behind-proxies-and-llm-gateways) availability check as available, for networks that block the check's direct request to `api.anthropic.com`. Claude Code still honors a "disabled by your organization" response |
340341| `CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK` | Set to `1` to skip the client-side [fast mode](/docs/en/fast-mode#use-fast-mode-behind-proxies-and-llm-gateways) availability check, for proxies that intercept the check's request rather than refuse it. The API still rejects fast mode requests when your organization has fast mode disabled |
341342| `CLAUDE_CODE_SKIP_FOUNDRY_AUTH` | Skip Azure authentication for Microsoft Foundry, for a proxy or gateway that injects its own `Authorization` header. Claude Code sends requests without an Azure credential and preserves the `Authorization` header you supply, for example through `ANTHROPIC_CUSTOM_HEADERS`. Ignored when `ANTHROPIC_FOUNDRY_API_KEY` or `ANTHROPIC_FOUNDRY_AUTH_TOKEN` is set. Before v2.1.203, this variable left the Microsoft Foundry client unable to send requests unless an API key was also set |
342| `CLAUDE_CODE_SKIP_MANTLE_AUTH` | Skip AWS authentication for Amazon Bedrock Mantle (for example, when using an LLM gateway) |
343| `CLAUDE_CODE_SKIP_PROMPT_HISTORY` | Set to `1` to skip writing prompt history and session transcripts to disk. Sessions started with this variable set do not appear in `--resume`, `--continue`, or up-arrow history. Useful for ephemeral scripted sessions
343| `CLAUDE_CODE_SKIP_MANTLE_AUTH` | Skip AWS authentication for Amazon Bedrock Mantle (for example, when using an LLM gateway)
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