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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Subagent echoes no longer treated as user turns

You'll notice
Useful3 Signal3
Subagents

Replayed subagent messages no longer kick off a new top-level turn.

What

Messages arriving on the REPL bridge that belong to a subagent are now dropped on arrival instead of being processed as if you had typed them, which prevents replayed subagent activity from starting a new top-level turn.

Evidence

Ignoring parented user frame at ingress (echo/replay of a subagent frame)

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 v2.1.251 →