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CHANGELOG.md

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Changelog

0.10.5 - 2025-12-17

Added

  • (unstable) Make constructing SessionConfigSelects on the Rust side nicer (#343)

0.10.4 - 2025-12-16

Added

  • (unstable) Draft implementation of session config options (#339)

0.10.3 - 2025-12-15

Added

  • (unstable) add SessionInfoUpdate to SessionUpdate enum (#334)
  • (rust-only) Introduce MaybeUndefined type to allow for distinguishing between null and undefined (#337)

0.10.2 - 2025-12-11

Added

  • (unstable) add cwd and mcp_servers to session/fork (#333)
  • (unstable) Draft implementation of session/resume (#324)

0.10.1 - 2025-12-09

Added

  • (unstable) Draft implementation of $/cancel_request notification (#303)

Fixed

  • (schema) Add title field back (#321)

0.10.0 - 2025-12-06

This release mostly contains several nice quality-of-life improvements for the Rust version of the schema, as well as an unstable draft implementation of session/fork for people to start trying out.

Added

  • (rust-only) More convenient builder method params (#313)
  • (unstable) Draft implementation of session/fork (#311)
  • (rust-only): Provide nicer interface to ErrorCode and add them to the docs (#301)

Fixed

  • (rust) Make new methods consistent for all id params (#306)

Other

  • Bump the minor group with 2 updates (#310)
  • (rust) Move to a more typical rust lib setup (#299)

0.9.1 - 2025-12-01

Fixed

  • Remove incorrect discriminator on McpServer type (#292)

0.9.0 - 2025-12-01

This release defines the _meta properties in the schema as intended and currently used, which is always an object of key/value pairs, with string keys and arbitrary values.

While this is how everyone is using them, it became clear in code generation that the types weren't quite matching up to the expected usage. This should alleviate some extra checks on the implementer side.

Added

  • [breaking] Provide clearer schema for _meta properties (#290)

0.8.0 - 2025-11-28

Some follow-up changes from 0.7.0. Most of the changes were in the Rust schema to make things a bit easier to work with.

However, there were some further cleanups to the JSON schema to remove some $ref indirection where possible to have the schema be a bit flatter.

There are also some fixes that were causing issues with code generators related to Extension methods, these now have concrete types in the schema as well.

Rust: There are some breaking changes to the OutgoingMessage types and other low-level RPC types to make them generate clearer JSON schema representations. Likely these are only used by SDKs, but they moved to tuple enum variants.

Also, rather than having free-floating V0 and V1 constants, these are now associated constants on the ProtocolVersion type itself.

Fixed

  • Broken doctest and test in CI (#267)

Other

  • Remove some nesting of the JSON schema (#278)
  • Easier ids in constructors (#275)
  • Exhaustive RPC types (#272)
  • Easier new methods for ExtRequest + ExtNotification (#271)
  • Protocol Version constants (#270)
  • Cleanup Rust example from schema docs (#269)
  • Introduce helper methods to get the corresponding method name of a (#268)

0.7.0 (2025-11-25)

This is a big release as we move towards a v1.0 release of the JSON Schema.

This should be the final form, we just want to go through the motions of upgrading all of the SDKs to verify no further changes are needed.

NOTE: The Protocol version is already, and remains, 1. This is just for the JSON Schema itself. There are no breaking changes to the protocol, we just reworked the schema representation to be more compliant with code generation tooling for the various SDKs.

We also now have two variants of the schema attached to the release:

Stable

  • schema.json
  • meta.json

Unstable

  • schema.unstable.json
  • meta.unstable.json

As we have more RFD implementations in progress, this will allow us to iterate on the schema without requiring SDKs to churn through the changes.

For SDK authors, it is important if you use the unstable version, to make sure the unstable features are behind a flag of some kind with clear direction to your users about the state of these features. But this will also allow teams to start testing the unstable features and provide feedback to the RFD authors.

Rust

The Rust crate, agent-client-protocol-schema has major breaking changes. All exported type are now marked as #[non_exhaustive]. Since the schema itself is JSON, and we can introduce new fields and variants in a non-breaking way, we wanted to allow for the same behavior in the Rust library.

All enum variants are also tuple variants now, with their own structs. This made it nicer to represent in the JSON Schema, and also made sure we have _meta fields on all variants.

This upgrade will likely come with a lot of compilation errors, but ideally upgrading will be more painless in the future.

0.6.3 (2025-10-30)

Protocol

  • Add discriminator fields to the schema.json for tagged enums to aid with code generation in language tooling.

0.6.2 (2025-10-24)

Protocol

Fix incorrectly named _meta field on SetSessionModeResponse

0.6.1 (2025-10-24)

Protocol

  • No changes

Rust

  • Make Implementation fields public

0.6.0 (2025-10-24)

Protocol

0.5.0 (2025-10-23)

Protocol

  • JSON Schema: More consistent inlining for enum representations to fix issues with code generation in language tooling.
  • Provide more schema-level information about JSON-RPC format.
  • Provide missing _meta fields on certain enum variants.

Rust

  • More consistent enum usage. Enums are always either newtype or struct variants within a single enum, not mixed.

0.4.11 (2025-10-20)

Protocol

  • No changes

Rust

  • Make id types easier to create and add PartialEq and Eq impls for as many types as possible.

0.4.10 (2025-10-16)

Protocol

  • No changes

Rust

  • Export Result type with a default of acp::Error

0.4.9 (2025-10-13)

  • Fix schema publishing

0.4.8 (2025-10-13)

  • Fix publishing

0.4.7 (2025-10-13)

Protocol

  • Schema uploaded to GitHub releases

Rust

0.4.6 (2025-10-10)

Protocol

  • No changes

Rust

  • Fix: support all valid JSON-RPC ids (int, string, null)

0.4.5 (2025-10-02)

Protocol

  • No changes

Typescript

  • Unstable initial support for model selection.

0.4.4 (2025-09-30)

Protocol

  • No changes

Rust

  • Provide default trait implementations for optional capability-based Agent and Client methods.

Typescript

  • Correctly mark capability-based Agent and Client methods as optional.

0.4.3 (2025-09-25)

Protocol

  • Defined Resource not found error type as code -32002 (same as MCP)

Rust

  • impl Agent and Client for Rc<T> and Arc<T> where T implements either trait.

0.4.2 (2025-09-22)

Rust

Unstable fix missing method for model selection in Rust library.

0.4.1 (2025-09-22)

Protocol

Unstable initial support for model selection.

0.4.0 (2025-09-17)

Protocol

No changes.

Rust Library

  • Make Agent and Client dyn compatible (you'll need to annotate them with #[async_trait]) #97
  • ext_method and ext_notification methods are now more consistent with the other trait methods #95
    • There are also distinct types for ExtRequest, ExtResponse, and ExtNotification
  • Rexport serde_json::RawValue for easier use #95

Typescript Library

  • Use Stream abstraction instead of raw byte streams #93
    • Makes it easier to use with websockets instead of stdio
  • Improve type safety for method map helpers #94