disableFastMode
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 can be disabled server-side while /fast is on, but nothing sets that today.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.248.
In the changelogs
2Releases whose published page names disableFastMode.
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v2.1.259
Skill-invoked model overrides now respect auto-mode/fast-mode compatibility
A model override declared by a skill or command is now ignored when the model isn't supported under the current auto or fast mode.
named in this entry, found in this entry's text
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v2.1.248
Auto mode can be switched off server-side when /fast is on
Auto mode can be disabled server-side while /fast is on, but nothing sets that today.
found in this entry's text
First cited
2The earliest release whose published evidence quoted disableFastMode was v2.1.248, 27 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 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.