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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

Agent telemetry records whether an agent is built in

Under the hood
Useful2 Signal4
Subagents

Subagent records mark built-in agents, such as the web-fetch agent, apart from ones you wrote.

What

Subagent launch records now carry an isBuiltIn flag alongside the existing fork, worktree path and working directory fields, so built-in agents such as the new web-fetch agent can be told apart from ones you defined.

Details
  • The built-in check moved from an inline comparison against a "built-in" source string to a shared predicate.
  • The field is only included when it is set.
Evidence

...(n.isBuiltIn !== void 0 && { isBuiltIn: n.isBuiltIn }),, isBuiltIn

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 →