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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

tengu_ccr_idle_heartbeat

flag in the build JSON

A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.227, including the newest one read.

Remote sessions can detect a dead connection through probes and force a reconnect, off by default.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.227.

First seen v2.1.227 10 Aug 2026
Last seen v2.1.308 22 Oct 2026
Builds70 / 149on this box, as of v2.1.308
Written about v2.1.227 first named in a changelog, 10 Aug 2026
v2.1.227in the build not in the build never minedv2.1.308

In the changelogs

4

Releases whose published page names tengu_ccr_idle_heartbeat.

  1. v2.1.228
    Remote control gains reconnect and reactivation heartbeats, all off by default

    Remote control adds reconnect, reactivation and idle heartbeats, each behind a gate that defaults off.

    gate cited by this entry, found in this entry's text

  2. v2.1.228
    Idle tracking and a reactivation heartbeat for remote sessions

    Remote sessions can measure idle time and send an extra beat when you come back, if the server allows.

    gate cited by this entry, found in this entry's text

  3. v2.1.227
    Liveness probing for remote sessions

    Remote sessions can detect a dead connection through probes and force a reconnect, off by default.

    gate cited by this entry, found in this entry's text

  4. v2.1.227
    Remote bridge idle liveness probes, off unless the flag is on

    The remote bridge can support idle liveness probes and resync on reconnect, off by default.

    gate cited by this entry, found in this entry's text

Gate readings

2
ReleaseResolvedThis accountAnonymousCompiled default
v2.1.228 read on another version Off by default, switched on for this account on on off
v2.1.227 read on another version Off by default, switched on for this account on on off

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.

Flag server, over time

12
Read asReadingFromUntilVersion installed
anonymous on 2026-10-17T05:30:04Z 2026-10-22T06:25:04Z v2.1.302 to v2.1.308
this account on 2026-09-10T21:47:12Z 2026-10-22T06:25:04Z v2.1.268 to v2.1.308
anonymous no longer carried 2026-10-17T05:25:57Z 2026-10-17T05:25:57Z v2.1.302
anonymous on 2026-08-19T04:25:04Z 2026-10-17T05:10:04Z v2.1.233 to v2.1.302
this account no longer carried 2026-09-10T21:46:45Z 2026-09-10T21:46:45Z v2.1.268
this account on 2026-09-08T20:36:15Z 2026-09-10T17:40:05Z v2.1.263 to v2.1.267
this account no longer carried 2026-09-08T20:34:58Z 2026-09-08T20:34:58Z v2.1.265
this account on 2026-09-06T02:40:05Z 2026-09-08T18:45:05Z v2.1.261 to v2.1.263
this account no longer carried 2026-09-06T02:36:19Z 2026-09-06T02:36:19Z v2.1.263
this account on 2026-08-14T22:10:05Z 2026-09-06T01:55:04Z v2.1.232 to v2.1.261
anonymous no longer carried 2026-08-19T04:20:14Z 2026-08-19T04:20:14Z v2.1.233
anonymous on 2026-08-14T22:10:05Z 2026-08-19T03:45:04Z v2.1.232 to v2.1.233

One row per unbroken stretch of one reading, newest first, from snapshots taken every twenty-five minutes or so. No longer carried is not off: it means the flag server stopped returning the gate at all, which is what a retired experiment looks like. The version column is what was installed when the reading was taken, not what caused it.

First cited

0

No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.

Presence across releases

1
BuildsHow manyDatesReading
v2.1.227 – v2.1.30870 builds10 Aug 2026 → 22 Oct 2026 ◆in the build

Build by build

70

One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.

BuildDateStateThe record behind it
v2.1.22710 Aug 2026·addedverdict: added · default bool:false
v2.1.22811 Aug 2026·presentverdict: present · default bool:false
v2.1.22912 Aug 2026·presentverdict: present · default bool:false
v2.1.23113 Aug 2026·presentverdict: present · default bool:false
v2.1.23213 Aug 2026·presentverdict: present · default bool:false
v2.1.23314 Aug 2026·presentverdict: present · default bool:false
v2.1.23417 Aug 2026·presentverdict: present · default bool:false
v2.1.23518 Aug 2026·presentverdict: present · default bool:false
v2.1.23619 Aug 2026·presentverdict: present · default bool:false
v2.1.23719 Aug 2026·presentverdict: present · default bool:false
v2.1.23820 Aug 2026·presentverdict: present · default bool:false
v2.1.23921 Aug 2026·presentverdict: present · default bool:false
v2.1.24022 Aug 2026·presentverdict: present · default bool:false
v2.1.24122 Aug 2026·presentverdict: present · default bool:false
v2.1.24224 Aug 2026·presentverdict: present · default bool:false
v2.1.24324 Aug 2026·presentverdict: present · default bool:false
v2.1.24525 Aug 2026·presentverdict: present · default bool:false
v2.1.24625 Aug 2026·presentverdict: present · default bool:false
v2.1.24726 Aug 2026·presentverdict: present · default bool:false
v2.1.24827 Aug 2026·presentverdict: present · default bool:false
v2.1.25027 Aug 2026·presentverdict: present · default bool:false
v2.1.25128 Aug 2026·presentverdict: present · default bool:false
v2.1.25231 Aug 2026·presentverdict: present · default bool:false
v2.1.2571 Sep 2026·presentverdict: present · default bool:false
v2.1.2581 Sep 2026·presentverdict: present · default bool:false
v2.1.2592 Sep 2026·presentverdict: present · default bool:false
v2.1.2603 Sep 2026·presentverdict: present · default bool:false
v2.1.2614 Sep 2026·presentverdict: present · default bool:false
v2.1.2636 Sep 2026·presentverdict: present · default bool:false
v2.1.2658 Sep 2026·presentverdict: present · default bool:false
v2.1.2668 Sep 2026·presentverdict: present · default bool:false
v2.1.2679 Sep 2026·presentverdict: present · default bool:false
v2.1.26810 Sep 2026·presentverdict: present · default bool:false
v2.1.26911 Sep 2026·presentverdict: present · default bool:false
v2.1.27012 Sep 2026·presentverdict: present · default bool:false
v2.1.27114 Sep 2026·presentverdict: present · default bool:false
v2.1.27214 Sep 2026·presentverdict: present · default bool:false
v2.1.27315 Sep 2026·presentverdict: present · default bool:false
v2.1.27416 Sep 2026·presentverdict: present · default bool:false
v2.1.27517 Sep 2026·presentverdict: present · default bool:false
v2.1.27618 Sep 2026·presentverdict: present · default bool:false
v2.1.27718 Sep 2026·presentverdict: present · default bool:false
v2.1.27819 Sep 2026·presentverdict: present · default bool:false
v2.1.28022 Sep 2026·presentverdict: present · default bool:false
v2.1.28123 Sep 2026·presentverdict: present · default bool:false
v2.1.28224 Sep 2026·presentverdict: present · default bool:false
v2.1.28325 Sep 2026·presentverdict: present · default bool:false
v2.1.28428 Sep 2026·presentverdict: present · default bool:false
v2.1.28529 Sep 2026·presentverdict: present · default bool:false
v2.1.28630 Sep 2026·presentverdict: present · default bool:false
v2.1.2871 Oct 2026·presentverdict: present · default bool:false
v2.1.2882 Oct 2026·presentverdict: present · default bool:false
v2.1.2893 Oct 2026·presentverdict: present · default bool:false
v2.1.2905 Oct 2026·presentverdict: present · default bool:false
v2.1.2916 Oct 2026·presentverdict: present · default bool:false
v2.1.2926 Oct 2026·presentverdict: present · default bool:false
v2.1.2937 Oct 2026·presentverdict: present · default bool:false
v2.1.2948 Oct 2026·presentverdict: present · default bool:false
v2.1.2958 Oct 2026·presentverdict: present · default bool:false
v2.1.2969 Oct 2026·presentverdict: present · default bool:false
v2.1.29914 Oct 2026·presentverdict: present · default bool:false
v2.1.30014 Oct 2026·presentverdict: present · default bool:false
v2.1.30115 Oct 2026·presentverdict: present · default bool:false
v2.1.30216 Oct 2026·presentverdict: present · default bool:false
v2.1.30318 Oct 2026·presentverdict: present · default bool:false
v2.1.30419 Oct 2026·presentverdict: present · default bool:false
v2.1.30520 Oct 2026·presentverdict: present · default bool:false
v2.1.30621 Oct 2026·presentverdict: present · default bool:false
v2.1.30721 Oct 2026·presentverdict: present · default bool:false
v2.1.30822 Oct 2026·presentverdict: present · default bool:false

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.

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