rateLimitFailFastEnabled
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Auto mode's remote config gains rateLimitFailFastEnabled, which keeps retry waits within a request's deadline
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.281.
In the changelogs
4Releases whose published page names rateLimitFailFastEnabled.
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v2.1.282
A deadline-limited request can cap how long it waits on rate limits
One time-limited API request can now pass its remaining time as a limit on rate-limit waits, when a setting is turned on
named in this entry, found in this entry's text
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v2.1.281
New rateLimitFailFastEnabled field in tengu_auto_mode_config
Auto mode's remote config gains
rateLimitFailFastEnabled, which keeps retry waits within a request's deadlinefound in this entry's text
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v2.1.281
Auto mode: stage-2 classifier rate-limit errors carry the retry-after delay
In auto mode, a rate-limited safety check now tells Claude how long to wait instead of calling the error transient
found in this entry's text
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v2.1.281
Side queries with a deadline fail fast on long Retry-After, behind auto-mode config
Deadline-bound side queries can now give up at once when the API asks for a wait longer than the time left
found in this entry's text
First cited
1The earliest release whose published evidence quoted rateLimitFailFastEnabled was v2.1.281, 23 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
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.
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 settings key does. All settings keys.