Documentation Index

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Session Close is stabilized

Announcement that the session/close method is now part of the stable ACP protocol.

Published: April 23, 2026

The Session Close RFD has moved to Completed and the session/close method is stabilized.

When advertised via sessionCapabilities.close, Clients can now ask Agents to cancel any ongoing work for a session and free the resources associated with it, without having to terminate the whole ACP process. This lets long-running Clients keep memory, threads, and subprocesses under control as users accumulate sessions over time.

For the protocol documentation, see Closing Active Sessions.

Last updated Oct 08, 2026