chore: release

[acp-release-bot]

🤖 New release

• agent-client-protocol-derive: 2.0.0 -> 2.1.0
• agent-client-protocol: 2.0.0 -> 2.1.0 (✓ API compatible changes)
• agent-client-protocol-polyfill: 2.0.0 -> 2.1.0 (✓ API compatible changes)
• agent-client-protocol-trace-viewer: 2.0.0 -> 2.1.0
• agent-client-protocol-conductor: 2.0.0 -> 2.1.0 (✓ API compatible changes)
• agent-client-protocol-http: 2.0.0 -> 2.1.0 (✓ API compatible changes)
• agent-client-protocol-cookbook: 2.0.0 -> 2.1.0
• agent-client-protocol-rmcp: 3.0.0 -> 3.0.1

Changelog

agent-client-protocol-derive

2.0.0 - 2026-07-23

Breaking changes

• Generated implementations now target agent-client-protocol 2.x and must not be mixed with
  core SDK 1.x types.

Added

• Support generic request, notification, and response types in the JSON-RPC derive macros, and
  accept any Rust type expression—including generic types such as Option<Response>—in a
  request's response attribute. (#267)

Changed

• Harden macro expansion with collision-resistant identifiers and fully qualified SDK paths.
  (#267)

agent-client-protocol

2.1.0 - 2026-07-28

Added

• (acp) Add v2 session MCP attachment (#303)
• (conductor) add v2 proxy initialization (#302)
• (acp) expose unstable LLM provider methods (#298)
• (unstable-v2) Better v2 session builders (#295)
• (acp) expose unstable plan operations (#297)
• (acp) expose unstable tool-call names (#296)

Fixed

• (acp) preserve same-version initialize fields (#299)
• (acp) Support WASI builds (#294)

Added

• (unstable) Expose programmatic tool-call names through the
  unstable_tool_call_name feature.
• (unstable) Expose v1 and draft-v2 plan operations through the
  unstable_plan_operations feature.
• (unstable-v2) Add high-level protocol v2 session builders and handles with
  independent prompt-acceptance requests, create and resume setup responses,
  cloneable command handles, configuration, close, and session-wide
  cancellation. Client.v2() and Agent.v2() callbacks receive a
  V2ConnectionTo whose unversioned build_session* and resume_session*
  methods expose only the v2 lifecycle. Session updates and interactive
  requests remain on typed connection handlers. With
  unstable_mcp_over_acp, V2SessionBuilder::with_mcp_server adds native
  per-session MCP attachment while preserving independent response
  consumption. MCP routes are installed and runners begin executing before
  session/new is published; successful attachments remain active for the
  connection lifetime. Global proxy attachment and proxy-session helpers
  remain v1-only.
• (unstable-v2) Expose protocol-neutral dynamic handler registration on
  V2ConnectionTo.
• (unstable-v2) Add ConnectionTo::spawn_connection_with_context for raw
  parents that need the context selected by a child builder.
  V2ConnectionTo::spawn_connection also returns that natural typed context.
  The existing ConnectionTo::spawn_connection::<Role> API remains
  source-compatible and returns a raw ConnectionTo, including when the v2
  child builder's callbacks receive V2ConnectionTo.
• (unstable-v2) Add a version-correct
  schema::v2::InitializeProxyRequest for _proxy/initialize. Proxy
  forwarding now preserves same-version raw initialize fields and raw session
  creation fields instead of interpreting v2 messages as permissive v1
  payloads. Add the low-level
  Builder::without_acp_version_guard escape hatch for routing infrastructure
  that performs its own raw version selection, plus
  Builder::with_v2_protocol_guard for raw-context links after v2 is selected.
• (unstable) Add typed v1 and draft-v2 JSON-RPC routing for configurable LLM
  provider methods behind unstable_llm_providers.

Fixed

• (unstable-v2) Preserve unknown initialize fields when the protocol router
  hands a same-version connection to its selected implementation.
• (unstable-v2) Do not retain unhandled v2 session messages for a dynamic v1
  session route that will never be installed.
• Register framework-owned ordered response handling before outbound requests
  become visible to the peer, preventing fast responses from overtaking session
  routing or proxy forwarding.
• Allow the portable protocol engine and transport abstractions to build for
  the wasm32-wasip1 and wasm32-wasip2 targets. The native process-backed
  AcpAgent, thread-backed Stdio, and associated LineDirection type are not
  exposed on these targets. This crate does not provide a WASI runtime adapter;
  embedders can supply transport through Channel, Lines, or
  futures::io-compatible ByteStreams.
  (#262)

agent-client-protocol-polyfill

2.1.0 - 2026-07-28

Added

• (polyfill) Support v2 MCP-over-ACP bridge (#305)

Added

• Add an unstable_protocol_v2 feature for using McpOverAcpPolyfill in a
  draft-v2 conductor chain. The polyfill selects the schema during proxy
  initialization, advertises the v2 ACP MCP capability when adapting an
  HTTP-capable agent, and handles v2 session setup and mcp/* messages without
  interpreting them as v1.

Fixed

• Forward MCP request cancellation hop by hop instead of tunneling the
  loopback connection's $/cancel_request ID inside mcp/message.

agent-client-protocol-trace-viewer

2.0.0 - 2026-07-23

Changed

• Align the version with the coordinated SDK 2.0 release. The trace viewer has no core SDK
  dependency, and its public API and request/response/notification trace JSON format are
  unchanged.

agent-client-protocol-conductor

2.1.0 - 2026-07-28

Added

• (polyfill) Support v2 MCP-over-ACP bridge (#305)
• (conductor) add v2 proxy initialization (#302)

Added

• Add opt-in protocol-v2 initialization for agent and nested proxy chains
  through unstable_protocol_v2, including version-aware custom instantiator
  methods, raw v2 session creation routing, and the conductor binary.

agent-client-protocol-http

2.1.0 - 2026-07-28

Fixed

• (http) Preserve outbound messages for slow streams (#292)

agent-client-protocol-cookbook

2.0.0 - 2026-07-23

Changed

• Update the cookbook for agent-client-protocol 2.x, including notification handling, ordered
  response callbacks, permission and streaming flows, feature-gated native MCP-over-ACP, and
  current conductor APIs. See the
  2.0 migration guide.

agent-client-protocol-rmcp

3.0.1 - 2026-07-28

Other

• updated the following local packages: agent-client-protocol

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This PR was generated with release-plz.