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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 v2.1.232

Fork-subagent setting is resolved once per session, with the environment checked first

Use it now
Useful4 Signal3
Subagents Notable

Setting CLAUDE_CODE_FORK_SUBAGENT decides fork subagents up front, and the answer is cached per session.

CLAUDE_CODE_FORK_SUBAGENT
What

The check for whether fork subagents are enabled now evaluates the hard disable and CLAUDE_CODE_FORK_SUBAGENT=false before anything else, and caches the result on the session config instead of a module-level variable. Setting the variable to true reports the source as the environment; otherwise a rollout check decides.

Details
  • The telemetry event for how the setting was resolved fires once, and only when the result is not disabled.
Evidence

CLAUDE_CODE_FORK_SUBAGENT

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.232 →