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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 v2.1.238

Messaging an agent that is waking up now queues the message instead of erroring

You'll notice
Useful3 Signal2
Agents

Messaging an agent that is waking up now queues the message instead of failing.

What

Sending a message to an agent that is mid-resume used to fail. Both the tool path and the interactive resume path now catch that case and queue the message for the agent's next tool round.

Details
  • The queued message is delivered as a meta user message on the agent's next tool round.
  • The sender is told the message may not be delivered if the agent turns out to have been stopped.
  • Only a task record that is genuinely gone still produces a failure notice.
Evidence

is already waking; message queued for its next tool round (not delivered if the agent turns out to have been stopped).

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 v2.1.238 →