Source Intelligence
Follow Discord

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 v2.1.20 Home All releases ←olderv2.1.19 v2.1.21newer→
Claude Code v2.1.20

SendMessageTool for Teammate Communication

What

New SendMessageTool replaces previous teammate messaging implementation with clearer protocol separation.

Usage

Internal tool used by agents in swarm mode.

Details
  • Handles message, broadcast, request, and response types
  • Protocol subtypes for shutdown and plan approval workflows
  • Better error messages for missing parameters
  • Improved in-process teammate abort handling
Evidence

Tool definition at line 448126 (SendMessageTool: () => tT2) with logging prefix [SendMessageTool] at lines 448249, 448275, 448284

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 v2.1.20 →