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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.

← All of v2.1.224 Home All releases ←olderv2.1.223 v2.1.225newer→
Claude Code v2.1.224

Forked sessions can be told their original is still running

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

A forked session can be told its original is still running and how to message it.

The fork notice is disabled on Windows and otherwise gated off unless CLAUDE_CODE_HARBOR_KITE is set.

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

A new note injected into the conversation tells the model that this session is a copy of another session that is still running, when the copy was made, and how to find and message the original. It is off by default: the path is disabled on Windows and otherwise falls back to tengu_harbor_kite being false, so it only runs if remote config or CLAUDE_CODE_HARBOR_KITE turns it on.

Details
  • The note is wrapped in <fork-source> tags in the prompt.
  • Queued and pending prompts are checked first so the note is not added twice.
  • Logs fork_source_note, with a parent_gone outcome when the original session can no longer be found.
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 →