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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

Peer checks now include process start time, not just pid

Under the hood
Useful2 Signal2
Cross-Session Messaging

Cross-session messages verify the peer's process start time, not just its pid.

What

Messages sent between sessions over the local socket, and the receipts for held messages, now carry an expected process start time alongside the expected pid. A reused pid on its own no longer passes verification.

Evidence

expectPeerProcStart

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 →