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HomeDocsClaude Code CLI 22 Sep 2026
One change · claude-code

Create custom subagents changedsub-agents

Nearest release: v2.1.280, published an hour 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 22 Sep 2026 16:49 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 22 Sep 2026 17:07 UTC.

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From line 420 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits102to this page, all time

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420420* `WaitForMcpServers`
421421* `Workflow`
422422 
423The second filter applies to subagents running in the background. Apart from `Agent` and `ExitPlanMode`, which follow the first filter's conditions wherever the subagent runs, a background subagent keeps every MCP tool but only these built-in tools: `Read`, `Grep`, `Glob`, `Bash`, `PowerShell`, `Edit`, `Write`, `NotebookEdit`, `WebFetch`, `WebSearch`, `TodoWrite`, `Skill`, `ToolSearch`, `EnterWorktree`, `ExitWorktree`, `Monitor`, `TaskStop`, `SendMessage`, and `Artifact`, plus [`SubagentHandback`](/docs/en/tools-reference) for a subagent that reports through it. Claude Code removes every other built-in tool from a background subagent, whether inherited or listed in the `tools` field, so the same definition can resolve to different tools in the foreground and the background. The removal reports no error unless it leaves the `tools` list [resolving to nothing](/docs/en/errors#agent-would-be-spawned-with-zero-tools).
423The second filter applies to subagents running in the background. Apart from `Agent` and `ExitPlanMode`, which follow the first filter's conditions wherever the subagent runs, a background subagent keeps every MCP tool but only these built-in tools: `Read`, `Grep`, `Glob`, `LSP`, `Bash`, `PowerShell`, `Edit`, `Write`, `NotebookEdit`, `WebFetch`, `WebSearch`, `TodoWrite`, `Skill`, `ToolSearch`, `EnterWorktree`, `ExitWorktree`, `Monitor`, `TaskStop`, `SendMessage`, and `Artifact`, plus [`SubagentHandback`](/docs/en/tools-reference) for a subagent that reports through it. Claude Code removes every other built-in tool from a background subagent, whether inherited or listed in the `tools` field, so the same definition can resolve to different tools in the foreground and the background. The removal reports no error unless it leaves the `tools` list [resolving to nothing](/docs/en/errors#agent-would-be-spawned-with-zero-tools).
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425Before v2.1.280, background subagents couldn't use `LSP`.
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425427[`ListAgents`](/docs/en/cross-session-messaging) follows these filters like any built-in tool: a foreground subagent inherits it in sessions where cross-session messaging is enabled, and a background subagent doesn't keep it.
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