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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 v2.1.224

Forked sessions are told once that their twin is still running

Not switched on
Useful2 Signal4
Cross-Session Messaging not in their notes

A forked session can be told once that its twin is still live and how to reach it.

The fork note requires the harbor-kite gate or CLAUDE_CODE_HARBOR_KITE and is skipped on Windows.

Feature flag
tengu_harbor_kite On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.224: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.224. It isn't a statement about your account. What a flag value here can and cannot tell you

CLAUDE_CODE_HARBOR_KITE
What

When a session is detected as a copy of another that is still live, a one-time note is queued for the model explaining that history up to the fork point is shared, that the two have since diverged, and how to find and message the sibling. Requires the tengu_harbor_kite gate (fallback false) or CLAUDE_CODE_HARBOR_KITE, and is skipped on Windows.

Details
  • Suppresses itself if the note is already in the conversation or already queued.
  • Reported as fork_source_note, with a parent_gone reason when the original session cannot be resolved.
Evidence

This session began as a fork (copy) of another session that is still running

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 v2.1.224 →