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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.223

Subagent resume and fork prompt reconstruction failures are caught

You'll notice
Useful3 Signal0
Subagents

Resuming or forking a subagent that fails now gives a clear tool error instead of a raw crash.

What

An exception while rebuilding a resumed subagent's system prompt used to escape raw; it is now caught and surfaced as a tool error.

Details
  • Failures are reported with a dedicated failure code.
  • The error is rethrown as the tool's own error type rather than the original exception.
Evidence

subagent_resume_fork_prompt_reconstruct_failed

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.223 →