Rust Crate v1.6.0

Added

• (unstable) add tool call name (#1752)
• (unstable-v2) add cancelled variant to tool call and plan item (#1750)

Schema v1.20.0

Added

• (unstable) add tool call name (#1752)

Schema v2.0.0-alpha.2

Added

• (unstable) add tool call name (#1752)
• (unstable-v2) add cancelled variant to tool call and plan item (#1750)

Rust Crate v1.5.0

Added

• (unstable-v2) add v2 semantic string types (#1742)
• (unstable-v2) rename diff patch payload to text (#1730)
• (unstable-v2) add v2 terminal output surface (#1679)

Fixed

• (unstable-v2) gate v2 auth methods on authMethods (#1728)
• (unstable-v2) Clean up conversion helpers (#1640)
• (schema) remove enum discriminators from invalid schemas (#1612)

Other

• (unstable-v2) clarify idle session semantics (#1729)

Schema v1.19.1

Fixed

• (schema) remove enum discriminators from invalid schemas (#1612)

Schema v2.0.0-alpha.1

Added

• (unstable-v2) add v2 semantic string types (#1742)
• (unstable-v2) rename diff patch payload to text (#1730)
• (unstable-v2) add v2 terminal output surface (#1679)

Fixed

• (unstable-v2) gate v2 auth methods on authMethods (#1728)
• (schema) remove enum discriminators from invalid schemas (#1612)

Other

• (unstable-v2) clarify idle session semantics (#1729)
• enable schema v2 releases (#1632)

Rust Crate v1.4.0

Added

• (unstable) Add descriptions to elicitation enum options (#1397)

Rust Crate v1.3.0

Added

• (schema) Stabilize boolean session config options (#1604)
• (unstable-v2) tighten v2 field validation (#1587)
• (unstable-v2) New diff format (#1586)
• (unstable-v2) Unify session/load and session/resume (#1584)
• (unstable-v2) require more session methods by default (#1578)
• (unstable-v2) More flexible permission requests (#1577)
• (unstable-v2) Align v2 Content types with the latest MCP spec (#1576)
• (unstable-v2) Unify the ID naming conventions across the schema (#1567)
• (unstable-v2) require typed config values (#1561)

Fixed

• (schema) Reject malformed protocol fields (#1583)
• (unstable) remove URL elicitation error (#1574)
• (unstable-v2) Preserve meta update signals in v2 (#1573)
• (unstable-v2) Continue to make more enums future compatible (#1571)
• (unstable-v2) Make empty MCP arrays optional (#1570)
• (unstable-v2) Make all session lifecycle requests consistent (#1555)

Other

• (schema) Clean up generated documentation and make wording more consistent (#1568)
• (rust) Box v2 protocol enum variants (#1562)

Schema v1.19.0

Added

• (unstable) Add descriptions to elicitation enum options (#1397)

Schema v1.18.0

Added

• (schema) Stabilize boolean session config options (#1604)
• (unstable-v2) Unify the ID naming conventions across the schema (#1567)

Fixed

• (schema) Reject malformed protocol fields (#1583)
• (unstable) remove URL elicitation error (#1574)
• (unstable-v2) Continue to make more enums future compatible (#1571)

Other

• (schema) Clean up generated documentation and make wording more consistent (#1568)