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February 24, 2026
RFD

Next Edit Suggestions RFD moves to Draft stage

The RFD for allowing agents to provide next edit suggestions has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
March 9, 2026
RFD

ACP Registry RFD moves to Completed

The RFD for the initial version of the ACP Registry has been completed. Please review the documentation for more information.
March 9, 2026
RFD

session_info_update Notification RFD moves to Completed

The RFD for the session_info_update notification has been stabilized and is now a part of the protocol. Please review the documentation for more information.
March 9, 2026
RFD

session/list RFD moves to Completed

The RFD for the session/list method has been stabilized and is now a part of the protocol. Please review the documentation for more information.
February 24, 2026
RFD

session/close RFD moves to Draft stage

The RFD for allowing agents to close a given session has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
February 24, 2026
RFD

Elicitation RFD moves to Draft stage

The RFD for allowing agents to elicit user input has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
February 24, 2026
RFD

Boolean Config Option RFD moves to Draft stage

The RFD for adding boolean config options to the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
February 20, 2026
RFD

Delete in Diff RFD moves to Draft stage

The RFD for indicating whether a diff resulted in a file deletion has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
February 18, 2026
Governance

Sergey Ignatov is now a Lead Maintainer

It is with great pleasure that I announce that Sergey Ignatov, from JetBrains, will be joining me as a Lead Maintainer role for ACP. Agus Zubiaga will remain a key part of the leadership group as a Core Maintainer.This is in recognition for Sergey’s many contributions to the protocol, we would not be where we are today without his efforts. In the past few months, Zed and JetBrains have been able to collaborate closely on the protocol, and it is time to reflect that fact more formally in our governance structure.I have enjoyed the chance to work with Sergey and the entire JetBrains team. There is still much work to be done, but with all of the agent and client teams working together, I am confident we can continue to make the ACP vision a reality. Allowing you to collaborate with the agent(s) you love wherever you are already working.Ben Brandt / Zed Industries / ACP Lead Maintainer
February 18, 2026
RFD

Message ID RFD moves to Draft stage

The RFD for adding message ids to the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
February 18, 2026
RFD

session/list RFD moves to Preview stage

The RFD for the session/list method has been moved to Preview stage. Please review the RFD for more information on the current proposal and provide feedback before the feature is stabilized.
February 18, 2026
RFD

session_info_update RFD moves to Preview stage

The RFD for the session_info_update notification has been moved to Preview stage. Please review the RFD for more information on the current proposal and provide feedback before the feature is stabilized.
February 10, 2026
RFD

ACP Registry RFD moves to Preview stage

The RFD for the ACP Registry has been moved to Preview stage. Please review the RFD for more information on the current proposal and provide feedback before the feature is stabilized.
February 4, 2026
RFD

Session Config Options RFD moves to Completed

The RFD for adding more generic Session Config Options to the protocol has been stabilized and is now a part of the protocol. Please review the documentation for more information.
February 4, 2026
RFD

session/delete moves to Draft stage

The RFD for allowing clients to delete a given session has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
February 4, 2026
RFD

Logout method moves to Draft stage

The RFD for allowing clients to logout from an agent connection has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
January 15, 2026
RFD

Rust SDK based on SACP RFD moves to Draft stage

The RFD for basing the Rust SDK on SACP has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
January 15, 2026
RFD

Session Config Options RFD moves to Preview stage

The RFD for adding more generic Session Config Options to the protocol has been moved to Preview stage. Please review the RFD for more information on the current proposal and provide feedback before the feature is stabilized.
January 14, 2026
RFD

Authentication Methods RFD moves to Draft stage

The RFD for creating additional types of authentication methods has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
January 1, 2026
RFD

Agent Registry RFD moves to Draft stage

The RFD for creating an Agent Registry has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
January 1, 2026
RFD

Session Usage RFD moves to Draft stage

The RFD for adding a new usage_update variant on the session/update notification and usage field on prompt responses in the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
December 31, 2025
RFD

Proxy Chains RFD moves to Draft stage

The RFD for adding proxy chain functionality in the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
December 11, 2025
RFD

Agent Telemetry Export RFD moves to Draft stage

The RFD for providing more guidance on how agents should export telemetry has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
December 3, 2025
RFD

session_info_update notification RFD moves to Draft stage

The RFD for adding a new session_info_update variant on the session/update notification in the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
December 3, 2025
RFD

_meta Propagation RFD moves to Draft stage

The RFD for providing more guidance on how the _meta parameter should be used within the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
November 26, 2025
RFD

session/resume RFD moves to Draft stage

The RFD for adding a “session/resume” method to the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
November 20, 2025
RFD

$/cancelRequest RFD moves to Draft stage

The RFD for adding a ”$/cancelRequest” method to the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
November 20, 2025
RFD

session/fork RFD moves to Draft stage

The RFD for adding a “session/fork” method to the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
November 3, 2025
RFD

Session Config Options RFD moves to Draft stage

The RFD for adding more generic Session Config Options to the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
October 31, 2025
RFD

session/list RFD moves to Draft stage

The RFD for adding a “session/list” method to the protocol has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on the implementation begins.
October 24, 2025
Protocol

Implementation Information for Agents and Clients

Agents and Clients are now able to provide information about themselves to the other party. The InitializeRequest message now includes an optional clientInfo field and the InitializeResponse message includes an optional agentInfo field.This information can be used by Clients to show users which Agent is running and what version, by both sides to track usage metrics of which agents and clients are most popular among their users, and also to help track down if any issues are encountered with particular implementation version. This follows the existing pattern laid out in the Model Context Protocol.This is being introduced as an optional field for now for backwards compatibility. It is possible it will be made into a required field in a future version of the protocol, like MCP, so that both sides can count on this information being available.