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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 20 Oct 2026
One change · claude-code

Create custom subagents changedsub-agents

Nearest release: v2.1.305, published 2 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 20 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 20 Oct 2026 22:07 UTC.

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From line 964 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
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964964* **Foreground**: if a rate limit, overload, or server error cuts off a subagent that already produced text output, the Agent tool returns that partial output with a note that the subagent was cut off and didn't finish its task. A subagent that produced nothing, or whose only output was tool calls, fails with [`Agent terminated early due to an API error`](/docs/en/errors#agent-terminated-early-due-to-an-api-error), followed by the error detail.
965965* **Background**: the subagent is marked failed, and the message Claude receives when it ends names the API error and includes the subagent's last output, so partial work isn't lost.
966966 
967If a subagent's report opens with the following line, the subagent finished on a fallback model:
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969```text theme={null}
970⚠ This agent switched to <model> because its earlier model could not be used.
971```
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967973When you configure a [fallback model chain](/docs/en/model-config#fallback-model-chains) and a subagent encounters a failure the chain covers, such as its model being unavailable, Claude Code switches the subagent to the first model in the chain that accepts the request. The subagent keeps working instead of ending on the error.
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969975Once the underlying API error clears, ask Claude to retry the task or [resume the subagent](#resume-subagents).
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