AcpSession.send, stream, and postMessage.
Properties
Request-level
_meta, e.g. cognition.ai/clientMessageId for
deduplication or cognition.ai/chain: "side" for a sidechain question.AbortSignal
Cancel the turn (
session/cancel) as soon as this signal aborts, e.g. a
request’s signal when the client disconnects. The turn still ends
normally, with the cancelled stop reason. An already aborted signal
throws its reason instead of sending the prompt.