Source Intelligence

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.

All of v2.1.200 Home All releases olderv2.1.199 v2.1.201newer

ObserverReport Tool

What

New tool available exclusively to observer agents for sending one-way advisory reports to the agent they are observing.

Details
  • Takes a single report string parameter
  • Target is resolved from the observer's pairing — no recipient to name
  • Delivers to the observed agent's task queue as a meta message
  • Returns an error if called outside an observer context, if the pairing is not armed, or if the observed agent is not running
  • Expected usage pattern is silence: only report when something genuinely warrants it
Evidence

Tool implementation (search for "ObserverReport is only available to an observer agent", "Your observer pairing is not armed")

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

See this entry in the whole of v2.1.200 →