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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 v2.1.227

Empty teammate messages are rejected up front

You'll notice
Useful2 Signal2
Cross-Session Messaging

Sending an empty message to a teammate now fails validation up front.

What

Sending a message to a teammate now fails validation with "message must not be empty" (error code 9) when the text is blank. The old rule requiring a summary alongside a string message was dropped.

Evidence

message must not be empty

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 v2.1.227 →