tengu_wise_comet
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.260 and was gone by v2.1.318.
Manual compaction now decides whether to strip thinking blocks, gated for adaptive thinking only.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.260.
In the changelogs
3Releases whose published page names tengu_wise_comet.
-
v2.1.260
New thinking-block-stripping decision during manual compaction, behind an unlaunched flag
Manual compaction now decides whether to strip thinking blocks, gated for adaptive thinking only.
gate cited by this entry
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v2.1.260
Compaction now decides whether to strip thinking blocks via a 'wise comet' policy
Compaction now uses a named policy to decide whether to strip trailing thinking blocks.
gate cited by this entry
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v2.1.260
New "thinking strip" gate for adaptive reasoning: tengu_wise_comet
A gated experiment controls whether adaptive thinking content gets stripped from output.
found in this entry's text, named in this entry, gate cited by this entry
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.260 read on another version | Off in both readings | off | off | 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 as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| anonymous | off | 2026-10-17T05:30:04Z | 2026-11-12T05:45:09Z | v2.1.302 to v2.1.322 |
| this account | off | 2026-09-16T01:35:04Z | 2026-11-12T05:45:09Z | v2.1.273 to v2.1.322 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | off | 2026-09-16T01:30:05Z | 2026-10-17T05:10:04Z | v2.1.273 to v2.1.302 |
| this account | on | 2026-09-10T21:47:12Z | 2026-09-16T01:30:05Z | v2.1.268 to v2.1.273 |
| anonymous | on | 2026-09-08T20:34:58Z | 2026-09-16T01:00:06Z | v2.1.265 to v2.1.273 |
| this account | no longer carried | 2026-09-10T21:46:45Z | 2026-09-10T21:46:45Z | v2.1.268 |
| this account | on | 2026-09-08T20:55:05Z | 2026-09-10T17:40:05Z | v2.1.265 to v2.1.267 |
| this account | off | 2026-09-08T20:36:15Z | 2026-09-08T20:45:05Z | v2.1.263 to v2.1.265 |
| this account | no longer carried | 2026-09-08T20:34:58Z | 2026-09-08T20:34:58Z | v2.1.265 |
| this account | off | 2026-09-06T02:40:05Z | 2026-09-08T18:45:05Z | v2.1.261 to v2.1.263 |
| anonymous | off | 2026-09-03T01:50:04Z | 2026-09-08T18:45:05Z | v2.1.259 to v2.1.263 |
| this account | no longer carried | 2026-09-06T02:36:19Z | 2026-09-06T02:36:19Z | v2.1.263 |
| this account | off | 2026-09-03T02:05:04Z | 2026-09-06T01:55:04Z | v2.1.259 to v2.1.261 |
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
1The earliest release whose published evidence quoted tengu_wise_comet was v2.1.260, 3 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
4Build by build
56One 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.
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.