chore: release

[acp-release-bot]

🤖 New release

• agent-client-protocol-derive: 2.2.0 -> 3.0.0
• agent-client-protocol: 2.2.0 -> 3.0.0 (✓ API compatible changes)
• agent-client-protocol-polyfill: 2.2.0 -> 3.0.0
• agent-client-protocol-rmcp: 3.1.1 -> 4.0.0 (✓ API compatible changes)
• agent-client-protocol-trace-viewer: 2.2.0 -> 3.0.0
• agent-client-protocol-conductor: 2.2.0 -> 3.0.0 (✓ API compatible changes)
• agent-client-protocol-http: 2.2.0 -> 3.0.0
• agent-client-protocol-cookbook: 2.2.0 -> 3.0.0 (✓ API compatible changes)

Changelog

agent-client-protocol-derive

2.2.0 - 2026-09-18

Other

• (deps) bump actions-rust-lang/setup-rust-toolchain from 1.17.0 to 2.0.0 (#356)

agent-client-protocol

3.0.0 - 2026-09-24

Added

• (acp) make schemars optional (#373)

Added

• Add a default-enabled schemars feature that forwards JSON Schema support to
  the schema crate and gates the typed MCP tool helpers. Set
  default-features = false to use the core SDK without schemars; custom MCP
  servers and independently enabled unstable protocol features remain available.
  Existing users of default-features = false who need the previous JSON Schema
  or typed MCP tool APIs should add features = ["schemars"].

agent-client-protocol-polyfill

2.2.0 - 2026-09-18

Other

• (deps) bump actions-rust-lang/setup-rust-toolchain from 1.17.0 to 2.0.0 (#356)

agent-client-protocol-rmcp

4.0.0 - 2026-09-24

Added

• (rmcp) [breaking] upgrade integration to rmcp 3.4
• (acp) make schemars optional (#373)

Breaking changes

• Upgrade the public rmcp dependency from 2.x to 3.4. This requires the next
  major release of agent-client-protocol-rmcp (4.x), while the core ACP SDK
  remains on 2.x. Services supplied to McpServer::from_rmcp must use rmcp 3.x.
• Adapt tool handlers to rmcp's CallToolResponse, use ServerConfig in place
  of the deprecated ServerInfo alias, and remove legacy tool-execution
  metadata. See the migration guide.

Added

• Integration coverage for MCP 2026-07-28 requests without initialization,
  discovery, per-request metadata/version validation, and MRTR results from
  caller-supplied rmcp services. This dependency upgrade does not replace the
  current unstable MCP-over-ACP wire lifecycle.

agent-client-protocol-trace-viewer

2.2.0 - 2026-09-18

Other

• (deps) bump actions-rust-lang/setup-rust-toolchain from 1.17.0 to 2.0.0 (#356)

agent-client-protocol-conductor

3.0.0 - 2026-09-24

Added

• (rmcp) [breaking] upgrade integration to rmcp 3.4

agent-client-protocol-http

2.2.0 - 2026-09-18

Other

• (deps) bump actions-rust-lang/setup-rust-toolchain from 1.17.0 to 2.0.0 (#356)

agent-client-protocol-cookbook

3.0.0 - 2026-09-24

Added

• (rmcp) [breaking] upgrade integration to rmcp 3.4

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