Claude is now told the recipient only sees your message's first line, so it writes self-contained openers.
What's wrong with this entry?
When Claude sends a message to another session, the tool now tells it that the summary is only a label on your own transcript row and is never transmitted, and that the recipient's human sees only the first line of the message until they expand it, so the first line must be a self-contained sentence rather than a greeting or a bare @-mention.
- Applies only to the cross-session form of the send-message tool.
- Effect for you: fewer messages that open with "hi" and hide the point below the fold.
A 5-10 word label for your own transcript row (not transmitted
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.
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v2.1.234
Messages injected by a host are classified separately from peer messages
Both mention cross
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v2.1.234
Cross-session control requests check ids more carefully
Both mention cross
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v2.1.234
Notice acks now wait for the record to persist
Both mention cross