What it is
The setting that switches models on a flagged refusal now records when you change it.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.251.
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
2The earliest release whose published evidence quoted tengu_refusal_fallback_setting_changed was v2.1.251, 28 Aug 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 above.
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.
Names beside it
Every feature flag in the inventory starting tengu_refusal_fallback, up to twelve of them.
tengu_refusal_fallback_preference_promptSwitching to a fallback model after a refusal can now ask you first, and remembers your answer never mined
tengu_refusal_fallback_resume_latchSafeguard and refusal notices now end with a Details line naming the refusal category. never mined
tengu_refusal_fallback_route_declinedA new bypass lets Claude Code re-offer a fallback model for bio-related refusals even after the user already declined that route never mined
tengu_refusal_fallback_suppressedA new bypass lets Claude Code re-offer a fallback model for bio-related refusals even after the user already declined that route never mined
tengu_refusal_fallback_triggeredIf compaction's model is refused, it retries on an allowed fallback instead of failing outright. 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.