What it is
Matching your reply to a suggested prompt is now case-insensitive
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.268.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
First cited
0No 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| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.268 | Not enough to say | no value returned | on | not a boolean we can read |
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
10| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| this account | on | 2026-09-10T21:47:12Z | 2026-09-23T08:55:05Z | v2.1.268 to v2.1.280 |
| anonymous | on | 2026-08-19T04:25:04Z | 2026-09-23T08:55:05Z | v2.1.233 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 | 2026-08-14T22:10:05Z | 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.
Names beside it
Every feature flag in the inventory starting tengu_prompt, up to twelve of them.
tengu_prompt_cache_1h_configWhether a one-hour prompt cache is allowed can now be overridden per agent and can ignore overage. v2.1.138
tengu_prompt_cache_breakCache diagnostics know when the baseline came from disk and skip misleading difference reports. never mined
tengu_prompt_cache_diagnosis_receivedMCP server error lines are escaped before display, plus minor telemetry and version-string cleanups. never mined
tengu_prompt_cache_diagnosticsCache diagnostics know when the baseline came from disk and skip misleading difference reports. v2.1.138
tengu_prompt_invisible_stripFleet's command bar and reply composer now strip invisible characters and block sending if any are found never mined
tengu_prompt_shell_permissionInline shell commands in a skill's instructions can now be handed to the model to run explicitly instead of executing silently never mined
tengu_prompt_suggestion_acceptedNo description from anybody. never mined
tengu_prompt_suggestion_shownNo description from anybody. never mined
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.