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This page tracks lifecycle changes for ACP Requests for Dialog. For broader ACP announcements, see Updates.
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Draft

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Session Notices RFD moves to Draft stage

The RFD for fire-and-forget, Client-presented session notices in ACP v1 and v2 has moved to Draft stage. Please review the RFD for more information and provide feedback on the event and presentation semantics.
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Draft

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Session Compaction RFD moves to Draft stage

The RFD for reporting ID-addressed context compaction lifecycle and optional retained summaries in ACP v1 and v2 has moved to Draft stage. Please review the RFD for more information and provide feedback while the entity and replay semantics are refined.
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Preview

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Terminal Authentication RFD moves to Preview

The Terminal Authentication RFD has moved to Preview. Clients can run an Agent’s interactive login flow in a terminal and reconnect after it succeeds. The proposal now focuses on terminal authentication. The experimental env_var method has been removed as an explicit SDK and schema variant. Please review the RFD for the version-specific wire shapes and lifecycle semantics.
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Completed

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Elicitation RFD moves to Completed

The RFD for structured user input through elicitation/create has been stabilized and is now part of the protocol. Agents can request form-based structured input or URL-based out-of-band interactions, and Clients advertise each mode they support explicitly. Please review the documentation for more information.
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Draft

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auth/status RFD moves to Draft stage

The RFD for allowing clients to query an agent’s current authentication state has moved to Draft stage. Please review the RFD for more information and provide feedback as work on the implementation begins.
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Draft

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Tool Call Name RFD moves to Draft stage

The RFD for adding an optional programmatic name to tool calls in ACP v1 and v2 has moved to Draft stage. Please review the RFD for more information and provide feedback while the draft implementation is exercised.
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Preview

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Elicitation RFD moves to Preview stage

The RFD for structured user input through elicitation/create 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.
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Completed

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Boolean Config Option RFD moves to Completed

The RFD for boolean session configuration options has been stabilized and is now part of the protocol. Agents can expose simple on/off toggles with type: "boolean" config options, and Clients opt in on v1 by advertising the session.configOptions.boolean capability. Please review the documentation for more information.
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Removed

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Agent Telemetry Export RFD removed

The Agent Telemetry Export RFD has been removed. Its design relied on clients injecting OpenTelemetry environment variables when launching agent subprocesses, which doesn’t translate to the new remote transports where agents aren’t launched by the client. Since the approach required no changes to the protocol itself, clients and agents that want this setup can adopt standard OpenTelemetry SDK environment variable configuration directly.
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Active

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Active RFD stage added

The RFD lifecycle now includes an Active stage between Draft and Preview. Active RFDs are the proposals that core maintainers or a working group are currently spending bandwidth on.
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Preview

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Boolean Config Option RFD moves to Preview stage

The RFD for adding boolean session configuration options 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.
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Completed

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Request Cancellation RFD moves to Completed

The RFD for $/cancel_request protocol-level request cancellation has been stabilized and is now part of the protocol. Either side can send this notification to request cancellation of an outstanding JSON-RPC request by ID. Please review the documentation for more information.
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Completed

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Rust SDK based on SACP RFD moves to Completed

The RFD for basing the Rust SDK on SACP has been completed with the 1.0 SDK releases. The Rust SDK is available as agent-client-protocol v1.0.0, and the TypeScript SDK reached the same milestone with @agentclientprotocol/sdk v1.0.0, showing that the SDK design goals apply beyond Rust.
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Completed

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model_config Category RFD moves to Completed

The RFD for the model_config session configuration option category has been stabilized and is now a part of the protocol. Agents can use model_config for model-related parameters such as context size or speed/quality trade-offs. Please review the documentation for more information.
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Preview

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Request Cancellation RFD moves to Preview stage

The RFD for adding $/cancel_request protocol-level request cancellation 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.
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Preview

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model_config Category RFD moves to Preview stage

The RFD for the model_config session configuration option category 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.
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Completed

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Message ID RFD moves to Completed

The RFD for adding agent-generated messageId fields to streamed message chunks has been stabilized and is now part of the protocol. In v1, message IDs are optional on message chunks for compatibility; in v2, they are required. Please review the documentation for more information.
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Completed

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Session Context Size and Cost RFD moves to Completed

The RFD for usage_update session notifications has been stabilized and is now a part of the protocol. Agents can report session-level context window size and optional cumulative cost through session/update. Please review the documentation for more information.
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Completed

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session/delete RFD moves to Completed

The RFD for allowing clients to delete a given session has been stabilized and is now a part of the protocol. Please review the documentation for more information.
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Completed

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_meta Propagation RFD moves to Completed

The RFD for documenting _meta propagation conventions for correlation metadata has been completed and is now part of the protocol documentation. Please review the documentation for more information.
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Preview

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Message ID RFD moves to Preview stage for v1

The v1 portion of the RFD for adding message IDs to streamed message chunks has been moved to Preview stage. Please review the RFD for more information on the current proposal and provide feedback before the v1 behavior is stabilized.
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Preview

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Session Usage RFD moves to Preview stage

The RFD for adding usage_update session notifications for context window size and cumulative session cost 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.
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Draft

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v2 Plan Variants RFD moves to Draft stage

The RFD for making item-based plan_update the default v2 plan shape has been moved to Draft stage. Please review the RFD for more information on replacing the old v1 plan update in v2 while the broader Plan Operations RFD continues.
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Draft

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End-Turn Token Usage RFD moves to Draft stage

The end-turn token usage portions of the original Session Usage RFD have been split into a separate Draft RFD for further design work. Please review the RFD for more information on the current proposal and provide feedback.
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Preview

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session/delete RFD moves to Preview stage

The RFD for allowing clients to delete a given session 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.
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Removed

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Unstable Session Model API removed

The never-stabilized session/set_model API and related session model response fields have been removed from the protocol artifacts. Agents should continue to expose model selection through Session Config Options.
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Completed

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Additional Directories RFD moves to Completed

The RFD for allowing clients to specify additional workspace roots for session lifecycle requests has been stabilized and is now a part of the protocol. Please review the documentation for more information.
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Draft

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v2 Enum Variant Extension RFD moves to Draft stage

The RFD for reserving _-prefixed enum variants for extensions while preserving non-underscore variants for future ACP versions has been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback as work on v2 continues.
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Draft

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Plan Operations Support RFD moves to Draft stage

The RFD for adding plan_update and plan_removed session update types 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.
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Completed

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Logout Method RFD moves to Completed

The RFD for the logout method has been stabilized and is now a part of the protocol. Please review the documentation for more information.
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Preview

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Additional Directories RFD moves to Preview stage

The RFD for allowing clients to specify additional workspace roots for session lifecycle requests 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.
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Preview

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Logout Method RFD moves to Preview stage

The RFD for adding a logout method 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.
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Preview

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Rust SDK based on SACP RFD moves to Preview stage

The RFD for basing the Rust SDK on SACP has been moved to Preview stage now that the initial crate import has been upstreamed to agentclientprotocol/rust-sdk. Please review the RFD for more information on the current proposal and provide feedback before the SDK is stabilized as 1.0.
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Draft

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model_config Category RFD moves to Draft

The RFD for the model_config category been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback before the feature is stabilized.
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Draft

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v2 Prompting RFD moves to Draft

The RFD for how the prompt lifecycle will work in v2 of the protocol been moved to Draft stage. Please review the RFD for more information on the current proposal and provide feedback before the feature is stabilized.
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Completed

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session/close RFD moves to Completed

The RFD for the session/close method has been stabilized and is now a part of the protocol. Please review the documentation for more information.
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Completed

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session/resume RFD moves to Completed

The RFD for the session/resume method has been stabilized and is now a part of the protocol. Please review the documentation for more information.
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Draft

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Streamable HTTP & WebSocket Transport RFD moves to Draft stage

The RFD for standardizing a remote ACP transport based on MCP Streamable HTTP with a WebSocket upgrade 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.
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Preview

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session/resume RFD moves to Preview stage

The RFD for adding a session/resume method 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.
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Preview

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session/close RFD moves to Preview stage

The RFD for allowing agents to close a given session 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.
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Draft

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Custom LLM Endpoint RFD moves to Draft stage

The RFD for allowing clients to specify custom provider configuration 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.
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Draft

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Additional Directories RFD moves to Draft stage

The RFD for allowing clients to specify additional directories for the agent to access 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.
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Completed

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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.

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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.

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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.
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Draft

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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.

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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.

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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.

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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.
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Draft

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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.
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Draft

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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.
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Preview

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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.

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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.
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Preview

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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.
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Completed

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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.
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Draft

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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.

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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.
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Draft

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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.
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Preview

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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.
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Draft

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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.
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Draft

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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.

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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.
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Draft

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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.
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Draft

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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. (This RFD was later removed — see the July 2, 2026 update.)
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Draft

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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.

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_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.
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Draft

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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.
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Draft

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$/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.

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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.
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Draft

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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.
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Draft

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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.