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HomeDocsClaude Code CLI 14 Oct 2026
One change · claude-code

Run Claude Code programmatically changedheadless

Nearest release: v2.1.300, published 7 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 14 Oct 2026 21:42 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 14 Oct 2026 22:07 UTC.

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3030 
3131### Start faster with bare mode
3232 
33Add `--bare` to reduce startup time by skipping auto-discovery of hooks, skills, custom commands, [subagents](/docs/en/sub-agents), installed plugins, MCP servers, auto memory, and CLAUDE.md. Without it, `claude -p` loads the same [context](/docs/en/how-claude-code-works#the-context-window) an interactive session would, including anything configured in the working directory or `~/.claude`.
33Add `--bare` to reduce startup time by skipping auto-discovery of hooks, skills, custom commands, [subagents](/docs/en/sub-agents), installed plugins, MCP servers, auto memory, and CLAUDE.md. Without it, `claude -p` discovers and loads them as an interactive session would, including anything configured in the working directory or `~/.claude`.
3434 
3535Bare mode is useful for CI and scripts where you need the same result on every machine. A hook in a teammate's `~/.claude` or an MCP server in the project's `.mcp.json` won't run, because bare mode never reads them. A directory you name with `--add-dir` is a partial exception: bare mode loads skills from its `.claude/skills/` folder, but still skips its `.claude/commands/` and `.claude/agents/` folders. [Skills from additional directories](/docs/en/skills#skills-from-additional-directories) covers what does and doesn't load.
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365365 
366366In the script, `"$1"` stands for the first argument you pass on the command line. Run `bash review.sh 123` and the shell replaces `"$1"` with `123`, so the script fetches the diff for PR 123. Claude Code prints the review as JSON, with the text in the `result` field.
367367 
368See [system prompt flags](/docs/en/cli-reference#system-prompt-flags) for more options including `--system-prompt` to fully replace the default prompt.
368See [system prompt flags](/docs/en/cli-reference#system-prompt-flags) for more options including `--system-prompt` to fully replace the default prompt. If you replace it, the run also starts without the [git status snapshot](/docs/en/settings-reference#includegitinstructions).
369369 
370370### Continue conversations
371371 
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