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 v2.1.222 Home All releases olderv2.1.221 v2.1.223newer

Agent-to-agent messaging gets a classifier review path

You'll notice
Useful3 Signal0
Permissions

Messaging another agent may now require classifier review instead of being automatically allowed.

What

The tool for messaging another agent no longer auto-allows in every permission mode; in some modes it defers to classifier review.

Details
  • The permission check can now return a passthrough behavior with a message stating that classifier review is required.
  • Recipient names must match a single-line pattern.
  • Over-long summaries are truncated rather than rejected outright.
  • The classifier input string now carries the summary, shutdown reason, request id and plan feedback.
Evidence

Message to another agent requires classifier review.

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

See this entry in the whole of v2.1.222 →