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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.232 ·

Agent telemetry records whether an agent is built in

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

Under the hood Internal Changes
JSON All of v2.1.232
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
SubagentsArea: what it touches
Internal ChangesKind: in v2.1.232,
What probably matters to youSection of the release
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.

See this entry in the whole of v2.1.232 →

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