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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 13 Aug 2026

Built-in agent selection is now a single three-way decision

Use it now

Useful2 Signal3

Subagents not in their notes

One resolver now picks no agents, coordinator or default, and the disable env var works as before.

CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS

What

Two separate checks were folded into one resolver returning "none" when CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS is set in a non-interactive session, "coordinator" in coordinator mode, and "default" otherwise. The env var behaves as before.

Evidence

CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS

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

See this entry in the whole of v2.1.232 →