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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 v2.1.251 ·

Teammate names cannot be reserved words or agent-id shaped

Teammate names can't be "main", "team-lead", or anything shaped like an agent id.

You'll notice New Features
JSON All of v2.1.251
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
TeammatesArea: what it touches
New FeaturesKind: in v2.1.251,
New FeaturesSection of the release
What

Naming a new teammate now rejects "main" and "team-lead" in any spelling, and rejects any name shaped like an agent id, since such a name already addresses an agent directly. The error asks you to choose another name. Only the plain "main" case was caught before.

Details
  • Validation runs unconditionally when the name is assigned.
Evidence

That teammate name is a reserved recipient ("main" or "team-lead", in any spelling) or has the shape of an agent id, which already addresses an agent directly — choose another teammate name.

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

See this entry in the whole of v2.1.251 →

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