Source Intelligence
Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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.

Reference / Feature flags

tengu_harbor_kite

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.224, including the newest one read.

What it is

Messages from another session render as an @sender header with indented body instead of raw tags.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.224.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined
2.1.224 – 2.1.243 19 releases in the build bool:false

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Gate readings

ReleaseResolvedThis accountAnonymousCompiled default
v2.1.248 Off by default, switched on for this account on on off
v2.1.238 On for this account, and not off by default on on on
v2.1.236 On for this account, and not off by default on on on
v2.1.232 read on another version On for this account, and not off by default on on on
v2.1.227 read on another version On for this account, and not off by default on on on
v2.1.224 read on another version On for this account, and not off by default on on on

Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.

Changelog entries naming it

  1. v2.1.248Kite network transport now defaults on, including on Windows

    The kite network transport is on by default everywhere, and CLAUDE_CODE_HARBOR_KITE=0 now really turns it off.

    gate cited by this entry

  2. v2.1.248Cross-session peer messaging is on by default

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

    gate cited by this entry

  3. v2.1.238Cross-session peer identity is now keyed to the account, still off by default

    Session-to-session messaging identity now follows your account, but the whole feature is off by default.

    gate cited by this entry

  4. v2.1.236Asking another local session to ping you when it goes idle, built end to end but not offered to the model

    Your session already honours idle-ping requests from other sessions; only asking for one is gated off.

    gate cited by this entry

  5. v2.1.236The message tool's notify_when_idle parameter and its supporting layer

    Claude can ask another session to ping it when idle, but the parameter is hidden unless the gate is on.

    gate cited by this entry

  6. v2.1.236Every session now advertises that it can send idle notices

    Every session now advertises itself as able to send idle notices, with no flag guarding it.

    gate cited by this entry

  7. v2.1.232Cross-session message results now describe and pin the target

    Cross-session send results now name the recipient and warn about duplicate or reused names.

    gate cited by this entry

  8. v2.1.232@-mention completion for other Claude sessions

    You could @-mention your other Claude sessions from the prompt box, but the flag is off by default.

    gate cited by this entry

  9. v2.1.232@-mentioning another Claude session

    Typing @name could message another live Claude session; the feature is off by default.

    gate cited by this entry

  10. v2.1.232A /config row for messages from your other sessions

    A settings row for handling messages from your other sessions exists but is hidden here.

    gate cited by this entry

  11. v2.1.232@-mentions can resolve other sessions, behind a flag

    @-mentions can point at another session instead of a file, but that stage is off here.

    gate cited by this entry

  12. v2.1.232Hidden cross-session inbox row in the settings dialog

    A cross-session inbox row can appear in settings but stays hidden without a server flag.

    gate cited by this entry

  13. v2.1.227Refusing peer messages when cross-session messaging is off is now a distinct case

    Sending messages between your Claude sessions stays off, and refusals now name the kill switch explicitly.

    gate cited by this entry

  14. v2.1.224Incoming peer messages get their own transcript rendering

    Messages from another session render as an @sender header with indented body instead of raw tags.

    gate cited by this entry

  15. v2.1.224Peer address shown in the session info panel

    The session info panel now shows your peer socket address when cross-session messaging is on.

    gate cited by this entry

  16. v2.1.224Remote bridge peers documented as reply-only

    Remote bridge sessions are described as reply-only and unreachable by name.

    gate cited by this entry

  17. v2.1.224Cross-session messaging explains why it is unavailable

    Messaging another session now tells you why it failed instead of silently doing nothing.

    gate cited by this entry

  18. v2.1.224Remote Control sessions now explain that they are reply-only

    Messaging a Remote Control session now explains it is reply-only until it messages you first.

    gate cited by this entry

  19. v2.1.224Cross-session messaging inbox now actually starts at startup

    Startup can now actually open the local socket that lets other sessions message you.

    gate cited by this entry

  20. v2.1.224New ListAgents tool for finding other sessions you can message

    A tool that lists other Claude sessions you can message exists but stays off by default.

    gate cited by this entry

  21. v2.1.224SendMessage can address other sessions directly and reports delivery timing

    Messages can be addressed to a specific session by socket or id, blocked unless peer messaging is enabled.

    gate cited by this entry

  22. v2.1.224Forked sessions are told once that their twin is still running

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

    gate cited by this entry

  23. v2.1.224Forked sessions can be told their original is still running

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

    gate cited by this entry

Documentation pages

None of Anthropic's documentation pages this site has a copy of carries this name.

Names beside it

Every feature flag in the inventory starting tengu_harbor, up to twelve of them.

tengu_harborNo description from anybody. 2.1.138 tengu_harbor_kite_cloudCLAUDE_CODE_HARBOR_KITE_CLOUD turns on cloud peer access; otherwise a server flag decides and it's off. 2.1.232 tengu_harbor_kite_limitsIncoming peer messages now pass rate, duplicate and loop checks before queuing, with drops shown to you. 2.1.242 tengu_harbor_kite_mode_emitMessages from a session with a mismatched permission mode are held and shown with an approve/deny dialog. 2.1.224 tengu_harbor_kite_pacing_offYou can switch off Harbor request pacing with a new environment variable. 2.1.236 tengu_harbor_kite_winSetting CLAUDE_CODE_HARBOR_KITE forces cross-session messaging on, and Windows can now be allowed through. 2.1.229 tengu_harbor_ledgerNo description from anybody. 2.1.138 tengu_harbor_mothNo description from anybody. 2.1.174 tengu_harbor_permissionsNo description from anybody. 2.1.138 tengu_harbor_prismNo description from anybody. 2.1.138 tengu_harbor_willowIn VS Code sessions, unsafe default permission modes from settings are refused and fall back to normal. 2.1.152

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.