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HomeDocsClaude Code CLI 23 Oct 2026
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Run Claude Code programmatically changedheadless

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Upstream edited this page at 23 Oct 2026 16:44 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 23 Oct 2026 17:07 UTC.

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#### MCP work when a non-interactive run ends

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5858 
5959* **MCP servers**: only servers supplied on the command line connect, for example with `--mcp-config`. In an interactive session, Claude Code also skips the automatic IDE connection unless you pass `--ide`.
6060* **System reminders**: Claude gets your prompts and the tool results without the [system reminders](/docs/en/glossary.md#system-reminder) Claude Code would add alongside them. For example, Claude isn't told when a file it read earlier changes on disk, and it doesn't get the list of available skills, including skills from an `--add-dir` folder.
61* **Background tasks**: none run. A command that reaches its [timeout](/docs/en/tools-reference.md#timeout-and-output-limits) stops instead of [moving to the background](/docs/en/tools-reference.md#background-commands).
61* **Background tasks**: Claude can't run background commands or background subagents, and the other features that [`CLAUDE_CODE_DISABLE_BACKGROUND_TASKS`](/docs/en/env-vars) turns off are off too. A command that reaches its [timeout](/docs/en/tools-reference.md#timeout-and-output-limits) stops instead of [moving to the background](/docs/en/tools-reference.md#background-commands).
6262 
6363Before v2.1.286, these limits held only partly: an interactive `--bare` session connected the MCP servers that a normal session would, every `--bare` session sent system reminders, and background tasks stayed available.
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8484If the run reaches its [`--max-budget-usd`](/docs/en/cli-reference#cli-flags) cap, Claude Code stops the remaining background work instead of waiting.
8585 
8686When background work starts another turn, the run prints each turn's result with the default `text` output and the last turn's result with `json` output. Before v2.1.295, the run printed only the last turn's result with `text` output too.
87 
88#### MCP work when a non-interactive run ends
89 
90A `claude -p` run doesn't wait for MCP work in the background:
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92* **[MCP tasks](/docs/en/mcp.md#mcp-tasks-that-run-on-the-server)**: on a remote server the job goes on. To follow it again, [resume that session](/docs/en/mcp.md#exit-clear-or-resume-while-an-mcp-task-runs), not as a one-shot `claude -p "<prompt>"` run.
93* **MCP calls that [automatic backgrounding](/docs/en/mcp.md#automatic-backgrounding-of-long-tool-calls) moved**: the call's result is lost.
8794 
8895### Stop a run with SIGTERM
8996 
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