Protocol
Elicitation is Stabilized
The Elicitation RFD has moved to Completed, and structured form and URL-mode user interactions are now stabilized in ACP.Agents can request structured non-sensitive input or direct users to secure out-of-band flows, while Clients explicitly advertise the modes they support.Read the full announcement.Protocol
ACP v2 is Available in Draft
The ACP v2 protocol documentation and schema are now published in Draft form.Read the full announcement.Protocol
Boolean Config Options are Stabilized
The Boolean Config Option Type RFD has moved to Completed and boolean session configuration options are stabilized.Agents can now expose native on/off controls, while v1 clients explicitly opt in through thesession.configOptions.boolean capability.Read the full announcement.Protocol
Request Cancellation is Stabilized
The Request Cancellation RFD has moved to Completed and the$/cancel_request notification is stabilized.Either side can now request cancellation of an outstanding JSON-RPC request by ID without relying on method-specific cancellation.Read the full announcement.SDKs
Rust and TypeScript SDKs Reach 1.0
The Rust SDK based on SACP RFD has moved to Completed after both the Rust and TypeScript ACP SDKs reached version 1.0.0.The releases provide stable foundations for building ACP clients, agents, and protocol adapters in both ecosystems.Read the full announcement.Protocol
Model Config Category is Stabilized
The Model Config Option Category RFD has moved to Completed and themodel_config category is stabilized.Agents can classify model-related parameters such as context size or speed and quality trade-offs so clients can present them alongside the main model selector.Read the full announcement.Protocol
Message IDs are Stabilized
The Message ID RFD has moved to Completed and optional Agent-generatedmessageId fields are stabilized in ACP v1.Message IDs let clients group streamed chunks into individual messages and detect when a new message begins.Read the full announcement.Protocol
Session Usage Updates are Stabilized
The Session Context Size and Cost RFD has moved to Completed andusage_update session notifications are stabilized.Agents can now report current context-window utilization and optional cumulative session cost so clients can keep usage displays up to date.Read the full announcement.Protocol
Session Delete is Stabilized
The Session Delete RFD has moved to Completed and thesession/delete method is stabilized.This gives users a standard way to remove sessions from session history while leaving storage and retention policy to the Agent.Read the full announcement.Protocol
Additional Workspace Roots are Stabilized
The Additional Workspace Roots RFD has moved to Completed andadditionalDirectories is stabilized for session lifecycle requests.Clients can declare absolute additional workspace roots while cwd remains the primary working directory.Read the full announcement.Protocol
Logout Method is Stabilized
The Logout Method RFD has moved to Completed and thelogout method is stabilized.This gives clients a standard way to end an authenticated state and let users authenticate again without restarting the ACP connection.Read the full announcement.Protocol
Session Close is Stabilized
The Session Close RFD has moved to Completed and thesession/close method is stabilized.This gives clients a way to tell agents to cancel in-flight work for a session and free the resources tied to it without tearing down the whole ACP process.Read the full announcement.Protocol
Session Resume is Stabilized
The Session Resume RFD has moved to Completed and thesession/resume method is stabilized.This gives clients a way to reconnect to an existing session without replaying conversation history, and lets proxies and adapters build session/load semantics on top of the simpler primitive.Read the full announcement.Working Groups
Transports Working Group
A new Transports Working Group has been formed to standardize remote agent transports like WebSockets and HTTP.Anna Zhdan (JetBrains / Core Maintainer) and Alex Hancock (Block / Goose) are leading the effort, with a Draft RFD already underway.Read the full announcement.Protocol
ACP Registry is Released
The ACP Registry RFD has moved to Completed and the initial version of the registry is released.The registry gives ACP clients a standard way to discover, install, and configure compatible agents without inventing custom integration metadata.Read the full announcement.Protocol
Session Info Update is Stabilized
The Session Info Update RFD has moved to Completed and the session_info_update notification is stabilized.This lets agents push session metadata updates to clients in real time so titles and related metadata stay current without polling.Read the full announcement.Protocol
Session List is Stabilized
The Session List RFD has moved to Completed and the session/list method is stabilized.This gives clients a standard way to discover existing sessions from an agent for features like history, switching, and cleanup.Read the full announcement.Governance
Sergey Ignatov joins ACP as Lead Maintainer
Sergey Ignatov from JetBrains is now a Lead Maintainer for ACP.This reflects the growing collaboration between Zed and JetBrains around ACP and recognizes Sergey’s significant contributions to the protocol.Read the full announcement.Protocol
Session Config Options are now Stabilized
The Session Config Options RFD has moved to Completed and is stabilized.This gives agents a flexible way to expose session-level configuration such as models, modes, reasoning levels, and other selectors.Read the full announcement.Protocol