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258258| `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 |
259259| `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 |
260260| `CLAUDE_CODE_DISABLE_TERMINAL_TITLE` | Set to `1` to disable automatic terminal title updates based on conversation context. This also skips the background small/fast-model request that [generates a session title](/docs/en/sessions#name-your-sessions) |
261| `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. 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. Neither variable turns thinking off on Fable models, which can't have thinking turned off. On [third-party providers](/docs/en/third-party-integrations), `MAX_THINKING_TOKENS=0` likewise omits the parameter, so the two variables behave the same there |
261| `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. 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. Neither variable turns thinking off on Opus 5.5 or the Fable models, which can't have thinking turned off. On [third-party providers](/docs/en/third-party-integrations), `MAX_THINKING_TOKENS=0` likewise omits the parameter, so the two variables behave the same there |
262262| `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 |
263263| `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 |
264264| `CLAUDE_CODE_DISABLE_WINDOWS_SHELL_LAUNCHER` | Set to `1` to start [PowerShell tool](/docs/en/tools-reference#powershell-tool) commands on Windows directly instead of through the `cmd.exe` launcher. By default, the launcher lets a PowerShell command [running in the background](/docs/en/tools-reference#background-commands) [carry over to the session's next process](/docs/en/agent-view#the-supervisor-process), such as when you [background the session](/docs/en/agent-view#from-inside-a-session). If you set the variable, a backgrounded PowerShell command stops when the session's process exits. Bash commands aren't affected. Requires Claude Code v2.1.269 or later |