Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
Cross-Session MessagingArea: what it touches
In DevelopmentKind: in v2.1.224,
What probably matters to youSection of the release
uds: and bridge: addressing plus delivery timing telemetry are validated off unless CLAUDE_CODE_HARBOR_KITE is set.
What
SendMessage can now target a peer by local socket (uds:) or by session id (bridge:), with failure advice that distinguishes a stale socket from a busy pipe, and it records a send_message_delivery event with the route taken and the time it took. Both address schemes are refused at validation time unless the peer feature is on, which needs tengu_harbor_kite or CLAUDE_CODE_HARBOR_KITE and a non-Windows machine.
Details
A socket that is gone (connection refused or missing) and a pipe that is busy produce different guidance.
The delivery event also carries how long the send waited when it was blocked.
With isolatePeerMachines on, sending to a cloud session now requires an explicit approval prompt.
Evidence
send_message_delivery
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_harbor_kiteOff 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 v2.1.224: off
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.
Flag reading movedThe flag server now returns on for tengu_harbor_kite, read as this account.A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading movedThe flag server now returns off for tengu_harbor_kite, read as this account.A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading movedThe flag server now returns on for tengu_harbor_kite, read as this account.A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading movedThe flag server now returns nothing at all, having stopped carrying it for tengu_harbor_kite, read as this account.A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's release notes agreeAdded cross-session SendMessage: Claude Code sessions can now message each other, on any of your machines, with ListAgents to discover them…
The name it cites is new in this buildNew in this build: CLAUDE_CODE_HARBOR_KITE
