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ruby-sdk/CHANGELOG.md
Koichi ITO 7a21bbd14b Release 0.5.0 
Many new features and fixes have been added, and it seems like a good time to cut a release.
This release enables the following user feedback to be addressed:

* https://github.com/modelcontextprotocol/ruby-sdk/issues/99#issuecomment-3667416303
* https://github.com/modelcontextprotocol/ruby-sdk/pull/206#issuecomment-3717086100

For now, the features completed so far can be included in this release,
and subsequent feature proposals can continue to be incorporated into future releases.
2026-01-11 03:37:34 +09:00

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

[0.5.0] - 2026-01-11

Added

  • Protocol specification version "2025-11-25" support (#184)
  • icons parameter support (#205)
  • websiteUrl parameter in serverInfo (#188)
  • description parameter in serverInfo (#201)
  • additionalProperties support for schema validation (#198)
  • "Draft" protocol version to supported versions (#179)
  • stateless mode for high availability (#101)
  • Exception messages for tool call errors (#194)
  • Elicitation skeleton (#178)
  • prompts/list and prompts/get support to client (#163)
  • Accept header validation for HTTP client transport (#207)
  • Ruby 2.7 - Ruby 3.1 support (#206)

Changed

  • Make tool names stricter (#204)

Fixed

  • Symlink path comparison in schema validation (#193)
  • Duplicate tool names across namespaces now raise an error (#199)
  • Tool error handling to follow MCP spec (#165)
  • XSS vulnerability in json_rpc_handler (#175)

[0.4.0] - 2025-10-15

Added

  • Client resources support with resources/list and resources/read methods (#160)
  • _meta field support for Tool schema (#124)
  • _meta field support for Prompt
  • title field support for prompt arguments
  • call_tool_raw method to client for accessing full tool responses (#149)
  • Structured content support in tool responses (#147)
  • AGENTS.md development guidance documentation (#134)
  • Dependabot configuration for automated dependency updates (#138)

Changed

  • Set default content to empty array instead of nil (#150)
  • Improved prompt spec compliance (#153)
  • Allow output schema to be array of objects (#144)
  • Return 202 response code for accepted JSON-RPC notifications (#114)
  • Added validation to MCP::Configuration setters (#145)
  • Updated metaschema URI format for cross-OS compatibility

Fixed

  • Client tools functionality and test coverage (#166)
  • Client resources test for empty responses (#162)
  • Documentation typos and incorrect examples (#157, #146)
  • Removed redundant transport requires (#154)
  • Cleaned up unused block parameters and magic comments

[0.3.0] - 2025-09-14

Added

  • Tool output schema support with comprehensive validation (#122)
  • HTTP client transport layer for MCP clients (#28)
  • Tool annotations validation for protocol compatibility (#122)
  • Server instructions support (#87)
  • Title support in server info (#119)
  • Default values for tool annotation hints (#118)
  • Notifications/initialized method implementation (#84)

Changed

  • Make default protocol version the latest specification version (#83)
  • Protocol version validation to ensure valid values (#80)
  • Improved tool handling for tools with no arguments (#85, #86)
  • Better error handling and response API (#109)

Fixed

  • JSON-RPC notification format in Streamable HTTP transport (#91)
  • Errors when title is not specified (#126)
  • Tools with missing arguments handling (#86)
  • Namespacing issues in README examples (#89)

[0.2.0] - 2025-07-15

Added

  • Custom methods support via define_custom_method (#75)
  • Streamable HTTP transport implementation (#33)
  • Tool argument validation against schemas (#43)

Changed

  • Server context is now optional for Tools and Prompts (#54)
  • Improved capability handling and removed automatic capability determination (#61, #63)
  • Refactored architecture in preparation for client support (#27)

Fixed

  • Input schema validation for schemas without required fields (#73)
  • Error handling when sending notifications (#70)

[0.1.0] - 2025-05-30

Initial release