Create custom subagents changedsub-agents
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851851* **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. In v2.1.199, a rate limit, overload, or server error that cut off the tool-calls-only shape returned an empty partial result containing only the cut-off note instead.
852852* **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.
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854When 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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854856Once the underlying API error clears, ask Claude to retry the task or [resume the subagent](#resume-subagents).
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856858### Subagent output scanning
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