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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 v2.1.224

Advisor entry added to Managed Agents multiagent rosters

You'll notice
Useful3 Signal4
Claude API Skill

Multiagent rosters can include one advisor entry so the main thread consults a stronger model mid-turn.

advisor
What

Rosters accept a new {"type": "advisor", "model": ...} entry, at most one per roster, letting the main thread consult a more capable model partway through a turn.

Details
  • Consultations run as a platform-spawned thread under a reserved name and do not count against the 25-concurrent-thread limit.
  • Advice arrives as an agent.thread_message_received event, either plaintext or [{"type": "redacted"}] depending on the advisor model.
  • Fable 5 is documented as temporarily unavailable in the advisor role.
Evidence

anthropic.advisor

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 v2.1.224 →