tengu_amber_tally
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.282, including the newest one read.
Default {}. Configures a warning shown when an inactive conversation is continued after its prompt cache has likely expired, or with a different model: the cost of re-sending the context is estimated as a percentage of the 5-hour usage limit from creditsPerMillionTokens (per model) and fiveHourCredits (per rate-limit tier), and if it reaches minPercent (default 5) a dialog offers Resume or Start a new conversation. With the default {} those two required maps are missing and no warning is shown. Setting newConversationPointer to false also drops the reminder that points a conversation started this way at the earlier transcript.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.286 bundle, and it can be wrong.
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 v2.1.282 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
15| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| this account | {"creditsPerMillionTokens":{"claude-fable-5":8333,"claude-fable-5-1":8333,"claude-haiku-4-5":833,"claude-opus-4-6":5000,"claude-opus-4-7":3338,"claude-opus-4-8":2750,"claude-opus-5":2292,"claude-opus-5-5":1833,"claude-sonnet-4-6":2500,"claude-sonnet-5":1250,"claude-sonnet-5-5":1250},"fiveHourCredits":{"default_claude_max_20x":200000,"default_claude_max_5x":50000},"minPercent":5} | 2026-11-02T13:05:04Z | 2026-11-12T17:25:05Z | v2.1.316 to v2.1.322 |
| anonymous | [] | 2026-10-17T05:30:04Z | 2026-11-12T17:25:05Z | v2.1.302 to v2.1.322 |
| this account | [] | 2026-11-02T12:55:05Z | 2026-11-02T12:55:05Z | v2.1.316 |
| this account | {"creditsPerMillionTokens":{"claude-fable-5":8333,"claude-fable-5-1":8333,"claude-haiku-4-5":833,"claude-opus-4-6":5000,"claude-opus-4-7":3338,"claude-opus-4-8":2750,"claude-opus-5":2292,"claude-opus-5-5":1833,"claude-sonnet-4-6":2500,"claude-sonnet-5":1250,"claude-sonnet-5-5":1250},"fiveHourCredits":{"default_claude_max_20x":200000,"default_claude_max_5x":50000},"minPercent":5} | 2026-11-01T20:45:05Z | 2026-11-02T12:40:07Z | v2.1.316 |
| this account | [] | 2026-11-01T20:40:05Z | 2026-11-01T20:40:05Z | v2.1.316 |
| this account | {"creditsPerMillionTokens":{"claude-fable-5":8333,"claude-fable-5-1":8333,"claude-haiku-4-5":833,"claude-opus-4-6":5000,"claude-opus-4-7":3338,"claude-opus-4-8":2750,"claude-opus-5":2292,"claude-opus-5-5":1833,"claude-sonnet-4-6":2500,"claude-sonnet-5":1250,"claude-sonnet-5-5":1250},"fiveHourCredits":{"default_claude_max_20x":200000,"default_claude_max_5x":50000},"minPercent":5} | 2026-11-01T20:25:04Z | 2026-11-01T20:30:06Z | v2.1.316 |
| this account | [] | 2026-11-01T20:20:05Z | 2026-11-01T20:20:05Z | v2.1.316 |
| this account | {"creditsPerMillionTokens":{"claude-fable-5":8333,"claude-fable-5-1":8333,"claude-haiku-4-5":833,"claude-opus-4-6":5000,"claude-opus-4-7":3338,"claude-opus-4-8":2750,"claude-opus-5":2292,"claude-opus-5-5":1833,"claude-sonnet-4-6":2500,"claude-sonnet-5":1250,"claude-sonnet-5-5":1250},"fiveHourCredits":{"default_claude_max_20x":200000,"default_claude_max_5x":50000},"minPercent":5} | 2026-10-18T22:20:05Z | 2026-11-01T19:30:06Z | v2.1.302 to v2.1.316 |
| this account | [] | 2026-10-18T21:35:25Z | 2026-10-18T21:35:25Z | v2.1.302 |
| this account | {"creditsPerMillionTokens":{"claude-fable-5":8333,"claude-fable-5-1":8333,"claude-haiku-4-5":833,"claude-opus-4-6":5000,"claude-opus-4-7":3338,"claude-opus-4-8":2750,"claude-opus-5":2292,"claude-opus-5-5":1833,"claude-sonnet-4-6":2500,"claude-sonnet-5":1250,"claude-sonnet-5-5":1250},"fiveHourCredits":{"default_claude_max_20x":200000,"default_claude_max_5x":50000},"minPercent":5} | 2026-10-18T21:33:49Z | 2026-10-18T21:33:49Z | v2.1.303 |
| this account | [] | 2026-09-28T18:02:35Z | 2026-10-18T21:20:04Z | v2.1.284 to v2.1.302 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | [] | 2026-09-28T18:02:35Z | 2026-10-17T05:10:04Z | v2.1.284 to v2.1.302 |
| anonymous | no longer carried | 2026-09-28T16:35:05Z | 2026-09-28T16:35:05Z | v2.1.283 |
| anonymous | [] | 2026-09-28T15:40:06Z | 2026-09-28T15:40:06Z | v2.1.283 |
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
2The earliest release whose published evidence quoted tengu_amber_tally was v2.1.282, 24 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
1Build by build
37One 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.