tengu_ccr_plugins_turn_start_check_enabled
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.299 and was gone by v2.1.307.
Nobody has written a line about this one. It is not in any of Anthropic's reference tables and no changelog entry here carries a description of it. It is in the build, which is the whole of what this page can claim.
In the changelogs
0No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.299 without anybody writing a line about it.
Gate readings
0No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.
Flag server, over time
32| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| this account | on | 2026-10-17T07:00:05Z | 2026-10-22T06:25:04Z | v2.1.302 to v2.1.308 |
| anonymous | on | 2026-10-17T05:30:04Z | 2026-10-22T06:25:04Z | v2.1.302 to v2.1.308 |
| this account | off | 2026-10-17T06:50:04Z | 2026-10-17T06:50:04Z | v2.1.302 |
| this account | on | 2026-10-17T04:40:04Z | 2026-10-17T06:40:04Z | v2.1.302 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | on | 2026-10-15T20:30:05Z | 2026-10-17T05:10:04Z | v2.1.301 to v2.1.302 |
| this account | off | 2026-10-17T04:35:04Z | 2026-10-17T04:35:04Z | v2.1.302 |
| this account | on | 2026-10-17T01:00:06Z | 2026-10-17T04:30:04Z | v2.1.302 |
| this account | off | 2026-10-17T00:50:04Z | 2026-10-17T00:50:04Z | v2.1.302 |
| this account | on | 2026-10-16T22:40:04Z | 2026-10-17T00:45:04Z | v2.1.302 |
| this account | off | 2026-10-16T22:35:04Z | 2026-10-16T22:35:04Z | v2.1.302 |
| this account | on | 2026-10-16T19:00:08Z | 2026-10-16T22:30:05Z | v2.1.301 to v2.1.302 |
| this account | off | 2026-10-16T18:50:05Z | 2026-10-16T18:50:05Z | v2.1.301 |
| this account | on | 2026-10-16T16:40:06Z | 2026-10-16T18:45:04Z | v2.1.301 |
| this account | off | 2026-10-16T16:35:04Z | 2026-10-16T16:35:04Z | v2.1.301 |
| this account | on | 2026-10-16T10:40:04Z | 2026-10-16T16:30:06Z | v2.1.301 |
| this account | off | 2026-10-16T10:35:04Z | 2026-10-16T10:35:04Z | v2.1.301 |
| this account | on | 2026-10-16T08:50:05Z | 2026-10-16T10:30:05Z | v2.1.301 |
| this account | off | 2026-10-16T08:45:05Z | 2026-10-16T08:45:05Z | v2.1.301 |
| this account | on | 2026-10-16T04:40:04Z | 2026-10-16T08:40:04Z | v2.1.301 |
| this account | off | 2026-10-16T04:35:04Z | 2026-10-16T04:35:04Z | v2.1.301 |
| this account | on | 2026-10-16T02:50:04Z | 2026-10-16T04:30:05Z | v2.1.301 |
| this account | off | 2026-10-16T02:45:04Z | 2026-10-16T02:45:04Z | v2.1.301 |
| this account | on | 2026-10-16T01:00:07Z | 2026-10-16T02:40:04Z | v2.1.301 |
| this account | off | 2026-10-16T00:50:04Z | 2026-10-16T00:50:04Z | v2.1.301 |
| this account | on | 2026-10-15T22:40:04Z | 2026-10-16T00:40:04Z | v2.1.301 |
| this account | off | 2026-10-15T22:35:04Z | 2026-10-15T22:35:04Z | v2.1.301 |
| this account | on | 2026-10-15T20:50:05Z | 2026-10-15T22:30:04Z | v2.1.301 |
| this account | off | 2026-10-15T20:45:04Z | 2026-10-15T20:45:04Z | v2.1.301 |
| this account | on | 2026-10-15T20:30:05Z | 2026-10-15T20:40:04Z | v2.1.301 |
| this account | off | 2026-10-15T17:00:06Z | 2026-10-15T20:25:04Z | v2.1.300 to v2.1.301 |
| anonymous | off | 2026-10-15T16:40:04Z | 2026-10-15T20:25:04Z | v2.1.300 to v2.1.301 |
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_ccr_plugins_turn_start_check_enabled was v2.1.299, 14 Oct 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
10One 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.