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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 v2.1.219

Sub-agent stream messages keep their own parent tool id

You'll notice
Useful3 Signal0
Sub-Agents

Output from nested tool calls inside sub-agents is now attributed to the right call.

What

Streamed tool events re-enqueued from a sub-agent now carry the parent tool use id from the event itself, so nested tool output is attributed to the right call.

Details
  • the id on the event is preferred, with the enclosing tool use id only as a fallback
  • previously output from nested tool calls could be reattributed to the outer tool
Evidence

parentToolUseID

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 v2.1.219 →