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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 v2.1.228

Local IPC sends refuse a pipe with no live owner

Under the hood
Useful2 Signal3
Cross-Session Messaging

Messages to another Claude session now fail loudly if no live session owns that pipe.

What

Connecting to a local message pipe is now asynchronous and first resolves who owns it. If no running session has registered an inbox there and the pipe cannot be attributed to a live process, the send throws instead of writing to an unvouched socket, with a dedicated error class.

Details
  • The requirement for a live owner is computed per call, and the build does not show what it falls back to when that computation says the check is not required.
Evidence

No running session has registered an inbox at

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 v2.1.228 →