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Reading a new release v2.1.251 Analysing changes · 2/5 Sorting the findings · 1/4 steps 470 findings $18.91 so far

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.121 27 Apr 2026

Disable Background Agents Fleet Setting

What

New disableAgentsFleet setting and CLAUDE_CODE_DISABLE_AGENTS_FLEET environment variable to fully disable the background-agents fleet.

Details

Disables claude agents, --bg, /background, and the on-demand daemon
Typically set in managed settings for enterprise environments
Can be set via environment variable: CLAUDE_CODE_DISABLE_AGENTS_FLEET=1

Evidence

Fleet disable option (search for "Disable the background-agents fleet", "CLAUDE_CODE_DISABLE_AGENTS_FLEET")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.121 →