CLAUDE_CODE_DISABLE_AGENTS_FLEET
A Claude Code environment variable, read out of the shipped bundle. It was in the build from v2.1.138 and was gone by v2.1.139.
A true value (1, true, yes, on) turns off the background-agents fleet, the same as the disableBackgroundAgents setting: the fleet gate that otherwise follows tengu_slate_meadow returns false, so claude daemon subcommands that need the gate stop with 'daemon' is not enabled., the built-in Claude agent is left out of the built-in agent list, and claude daemon run exits with claude daemon: background agents disabled (ZDR/3P/opt-out).
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.138 bundle, and it can be wrong.
In the changelogs
2Releases whose published page names CLAUDE_CODE_DISABLE_AGENTS_FLEET.
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v2.1.139
Agent View Disable Setting Renamed
found in this entry's text
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v2.1.121
Disable Background Agents Fleet Setting
found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_DISABLE_AGENTS_FLEET was v2.1.121, 27 Apr 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
2Build by build
149One 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 environment variable does. All environment variables.