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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 v2.1.248

Stricter checks before connecting to a peer session

You'll notice
Useful2 Signal3
Cross-Session Messaging

Connecting to another session's socket now verifies the process id and owner first.

What

Before connecting to another session's socket, Claude now verifies the peer's process id and that the socket is owned by an expected user id, rather than trusting the path alone.

Details
  • Messaging state gained fields for the accepted owner user ids, an in-flight start marker, and the last start-failure detail.
Evidence

peerDirOwnerUids

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 v2.1.248 →