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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 v2.1.224

Cross-session sends take plain text without a summary

You'll notice
Useful3 Signal3
Cross-Session Messaging

Messages to another session accept plain text without a summary; structured objects are rejected.

What

Messages addressed to another session skip the usual validation: plain text is accepted without the normally-required summary, and structured object messages are rejected outright with a note that only plain text can cross sessions.

Details
  • Applies to recipients addressed through the two cross-session transports; ordinary in-session recipients are unaffected.
  • Requires cross-session messaging to be available in the session.
Evidence

structured messages cannot be sent cross-session — only plain text

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 v2.1.224 →