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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 v2.1.236

One-shot idle subscriptions deliver exactly one notice, or an expiry

Under the hood
Useful2 Signal2
Cross-Session Messaging

An idle subscription to another session delivers one notice or an expiry, and older peers are refused.

What

A subscription to another session's idle state results in a single [Cross-session idle notice] message, or a notice that the subscription expired. Peers running an older version are reported as unsupported and nothing is subscribed.

Details
  • The local socket channel gained request and notice frame types, correlated back to the original message id.
  • Self-targets and out-of-reach namespaces are vetted and refused.
  • Analytics under cross_session_notify_idle cover own_inbox_unbound, unvettable_reply_target, self_target_frame, malformed_frame and malformed_notice.
  • Session records advertise their supported peer features so version mismatches are detected before subscribing.
  • The parameter is only present in the cross-session-messaging build of the tool.
Evidence

notify_when_idle: that session runs a version without idle notices \u2014 nothing was subscribed.

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 v2.1.236 →