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This page is for larger ACP announcements and project updates. For lifecycle changes to Requests for Dialog, see RFD Updates.
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March 9, 2026
Protocol

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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.
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March 9, 2026
Protocol

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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.
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March 9, 2026
Protocol

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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.
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February 18, 2026
Governance

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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.
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February 4, 2026
Protocol

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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.
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October 24, 2025
Protocol

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Implementation information for agents and clients

ACP now allows agents and clients to share implementation details during initialization using the optional clientInfo and agentInfo fields.This makes it easier to identify which implementation is running, improve compatibility diagnostics, and understand adoption across the ecosystem.Read the full announcement.