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 v2.1.198 Home All releases olderv2.1.197 v2.1.199newer

Agent Spawn Results: Internal Metadata Privacy

Agent spawn tool results now include an explicit advisory telling Claude not to quote or paste the internal metadata (agent ID, task ID) into user-facing replies.

Details
  • Async agent spawn: "(This tool result is internal metadata — never quote or paste any part of it, including the agentId below, into a user-facing reply.)"
  • Cloud agent spawn: same advisory for taskId
  • Local spawn: same advisory for agent_id
  • Prevents Claude from accidentally exposing internal session identifiers to users
Evidence

Updated spawn result strings (search for "This tool result is internal metadata — never quote or paste any part of it")

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

See this entry in the whole of v2.1.198 →