tengu_slate_siskin
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.138 and was gone by v2.1.162.
Config for the memory-write survey, default {enabled: false, timeoutMs: 8000, throttleMs: 30000, summaryLineThreshold: 5}; valid fields override the defaults, and a value that fails the schema is logged and ignored entirely. With enabled on (and product feedback allowed, among other checks), a main-agent write to a file directly inside the memory directory, other than MEMORY.md, is shown in an Approve/Reject dialog, and rejecting undoes the write. throttleMs spaces dialogs apart, the dialog closes with a timeout outcome after timeoutMs, and a write over summaryLineThreshold lines gets a one-sentence model summary.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.161 bundle, and it can be wrong.
In the changelogs
2Releases whose published page names tengu_slate_siskin.
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v2.1.120
Memory Write Confirmation Dialog
gate cited by this entry, found in this entry's text
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v2.1.120
Memory Write Confirmation [Gradual Rollout]
gate cited by this entry, found in this entry's text
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.120 read on another version | Not enough to say | no value returned | no value returned | 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
12| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| anonymous | {"enabled":false,"summaryLineThreshold":5,"throttleMs":30000,"timeoutMs":8000} | 2026-10-17T05:30:04Z | 2026-10-22T06:25:04Z | v2.1.302 to v2.1.308 |
| this account | {"enabled":false,"summaryLineThreshold":5,"throttleMs":30000,"timeoutMs":8000} | 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 | {"enabled":false,"summaryLineThreshold":5,"throttleMs":30000,"timeoutMs":8000} | 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 | {"enabled":false,"summaryLineThreshold":5,"throttleMs":30000,"timeoutMs":8000} | 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 | {"enabled":false,"summaryLineThreshold":5,"throttleMs":30000,"timeoutMs":8000} | 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 | {"enabled":false,"summaryLineThreshold":5,"throttleMs":30000,"timeoutMs":8000} | 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 | {"enabled":false,"summaryLineThreshold":5,"throttleMs":30000,"timeoutMs":8000} | 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
1The earliest release whose published evidence quoted tengu_slate_siskin was v2.1.120, 24 Apr 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
149One 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.