> ## Documentation Index
> Fetch the complete documentation index at: https://agentclientprotocol.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Updates

> Updates and announcements about the Agent Client Protocol

This page is for larger ACP announcements and project updates. For lifecycle changes to Requests for Dialog, see [RFD Updates](/rfds/updates).

<Update label="April 23, 2026" tags={["Protocol"]}>
  ## Session Close is Stabilized

  The Session Close RFD has moved to Completed and the `session/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](/announcements/session-close-stabilized).
</Update>

<Update label="April 22, 2026" tags={["Protocol"]}>
  ## Session Resume is Stabilized

  The Session Resume RFD has moved to Completed and the `session/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](/announcements/session-resume-stabilized).
</Update>

<Update label="April 22, 2026" tags={["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](/announcements/transports-working-group).
</Update>

<Update label="March 9, 2026" tags={["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](/announcements/acp-agent-registry-stabilized).
</Update>

<Update label="March 9, 2026" tags={["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](/announcements/session-info-update-stabilized).
</Update>

<Update label="March 9, 2026" tags={["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](/announcements/session-list-stabilized).
</Update>

<Update label="February 18, 2026" tags={["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](/announcements/sergey-ignatov-lead-maintainer).
</Update>

<Update label="February 4, 2026" tags={["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](/announcements/session-config-options-stabilized).
</Update>

<Update label="October 24, 2025" tags={["Protocol"]}>
  ## 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](/announcements/implementation-information).
</Update>