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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 v2.1.198

control_cancel_request Message Type

A new control_cancel_request message type in the session transcript allows in-flight control requests (such as side questions) to be cancelled mid-flight.

Details
  • Type carries a request_id string matching the outstanding control_request
  • Workers that receive this message should abort the in-flight request
Evidence

Transcript parser addition (search for "control_cancel_request")

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 →