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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
One name

tengu_print_engine_loop

A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.247 and was gone by v2.1.257.

Familyfeature flagFeature flags
Builds5of the 123 on this box
First seen v2.1.247 26 Aug 2026
Last seen v2.1.252 31 Aug 2026
Statusgoneas of v2.1.280

What it is

The env var controlling print and engine loop behavior was renamed to CLAUDE_CODE_HUMBLE_HAMMOCK and still defaults to off.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.257.

Presence across releases

2
BuildsHow manyDatesReading
v2.1.247 – v2.1.2525 builds26 Aug 2026 → 31 Aug 2026 in the build
v2.1.257 – v2.1.28021 builds1 Sep 2026 → 22 Sep 2026 not in the build

Build by build

26

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
v2.1.24726 Aug 2026·addedverdict: added · 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·removedverdict: removed
v2.1.2581 Sep 2026·absent
v2.1.2592 Sep 2026·absent
v2.1.2603 Sep 2026·absent
v2.1.2614 Sep 2026·absent
v2.1.2636 Sep 2026·absent
v2.1.2658 Sep 2026·absent
v2.1.2668 Sep 2026·absent
v2.1.2679 Sep 2026·absent
v2.1.26810 Sep 2026·absent
v2.1.26911 Sep 2026·absent
v2.1.27012 Sep 2026·absent
v2.1.27114 Sep 2026·absent
v2.1.27214 Sep 2026·absent
v2.1.27315 Sep 2026·absent
v2.1.27416 Sep 2026·absent
v2.1.27517 Sep 2026·absent
v2.1.27618 Sep 2026·absent
v2.1.27718 Sep 2026·absent
v2.1.27819 Sep 2026·absent
v2.1.28022 Sep 2026·absent

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.

Gate readings

1
ReleaseResolvedThis accountAnonymousCompiled default
v2.1.257 read on another version On for this account, and not off by default on on no gate table built for this version

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

14
Read asReadingFromUntilVersion installed
this account on 2026-09-10T21:47:12Z 2026-09-23T08:55:05Z v2.1.268 to v2.1.280
anonymous on 2026-08-28T16:45:05Z 2026-09-23T08:55:05Z v2.1.246 to v2.1.280
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 2026-08-28T18:40:05Z 2026-09-06T01:55:04Z v2.1.246 to v2.1.261
this account off 2026-08-28T16:20:16Z 2026-08-28T17:45:05Z v2.1.246
anonymous off 2026-08-25T18:10:05Z 2026-08-28T16:25:09Z v2.1.233 to v2.1.246
this account on 2026-08-28T16:15:43Z 2026-08-28T16:15:43Z v2.1.251
this account off 2026-08-28T00:06:06Z 2026-08-28T15:25:06Z v2.1.250 to v2.1.246
this account on 2026-08-27T23:46:12Z 2026-08-27T23:46:12Z v2.1.248
this account off 2026-08-25T19:25:04Z 2026-08-27T22:35:37Z v2.1.233 to v2.1.246

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.

Names beside it

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

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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