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260260| `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 |
261261| `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 |
262262| `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 |
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) and [`--append-subagent-system-prompt-file`](/docs/en/cli-reference#cli-flags) flags supply the appended text and set this variable automatically, so you don't need to set it yourself. Requires Claude Code v2.1.205 or later |
264264| `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 |
265265| `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 |
266266| `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 |
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318318| `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) |
319319| `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) |
320320| `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`
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`