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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 v2.1.248 Home All releases ←olderv2.1.247 v2.1.250newer→
Claude Code v2.1.248

Cross-session peer messaging is on by default

You'll notice
Useful4 Signal4
Cross-Session Messaging Notable not in their notes

Sessions can message each other by default now, including on Windows; the cloud variant stays off.

Feature flag
tengu_harbor_kite Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

This account: on · anonymous baseline: on · compiled default in v2.1.248: off

tengu_harbor_kite_win Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

This account: on · anonymous baseline: on · compiled default in v2.1.248: off

tengu_harbor_kite_mode_emit Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

This account: on · anonymous baseline: on · compiled default in v2.1.248: off

tengu_harbor_kite_cloud Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.248: on

Read once, for one account on one subscription tier, against v2.1.248. It isn't a statement about your account. What a flag value here can and cannot tell you

CLAUDE_CODE_HARBOR_KITE_CLOUD
What

Harbor "kite", the feature that lets separate Claude Code sessions message each other, now defaults to on when the server sends no value, including on Windows. The gates tengu_harbor_kite, tengu_harbor_kite_win and tengu_harbor_kite_mode_emit all fall back to true in this build. The cloud variant stays off: tengu_harbor_kite_cloud falls back to false unless CLAUDE_CODE_HARBOR_KITE_CLOUD is set.

Details
  • Previously these fell back to off, so the feature was dark without an explicit server value.
  • Mode emission (reporting which messaging mode a session is in) is covered by the same default flip.
Evidence

tengu_harbor_kite_mode_emit

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 →