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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 v2.1.239

Nested agent activity is tracked per chain with eviction

Under the hood
Useful2 Signal3
Subagents

Nested agent chains now track their activity separately instead of sharing one global state.

What

Activity tracking for nested agents moved from a single module-level map into a class that keys state by chain, evicts old keys under a cap and cleans up that key's heartbeat and idle timers. Nothing changes on screen, but concurrent agent chains are now accounted for separately instead of sharing one global state.

Details
  • Listeners were split into one for the main loop and one for dropped nested chains.
Evidence

nestedChainDropListener

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 v2.1.239 →