954078d90c
New features and changes have landed, making it a good time to cut a release. Further feature proposals can be incorporated in future releases. In particular, releasing "Make `StreamableHTTPTransport` a Rack application" soon would help keep it consistent with the README.md for Rails integration.
264 lines
7.5 KiB
Markdown
264 lines
7.5 KiB
Markdown
# Changelog
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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## [0.13.0] - 2026-04-16
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### Added
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- Make `StreamableHTTPTransport` a Rack application (#263)
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- Support `elicitation/create` per MCP specification (#312)
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- Add `around_request` hook for request instrumentation (#309)
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- Add `_meta` field to resource, content, and result classes (#310)
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### Removed
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- Remove `Server#create_sampling_message` direct call (#311)
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## [0.12.0] - 2026-04-11
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### Added
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- Support customizing the Faraday client in `MCP::Client::HTTP` (#306)
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### Changed
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- Auto-set `server.transport` in `Transport#initialize` (#305)
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### Fixed
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- Validate Content-Type on POST requests (#304)
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## [0.11.0] - 2026-04-06
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### Added
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- Support `sampling/createMessage` per MCP specification (#282)
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- Support `completion/complete` per MCP specification (#289)
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### Fixed
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- Support POST response SSE streams for server-to-client messages (#294)
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- Return protocol errors for invalid arguments and server errors (#285)
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- Fix client methods silently swallowing JSON-RPC error responses (#281)
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- Close streams outside mutex in session cleanup (#291)
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## [0.10.0] - 2026-03-30
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### Added
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- Session expiry controls for `StreamableHTTPTransport` via `session_idle_timeout:` option (#268)
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### Changed
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- `ServerSession` for per-connection state (#275)
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### Removed
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- Remove `Server#notify_progress` broadcast API (#276)
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- Remove undocumented handler override methods (#270)
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### Fixed
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- Reject POST requests without session ID in stateful mode (#274)
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## [0.9.2] - 2026-03-27
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### Fixed
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- Use accessor method in `server_context_with_meta` instead of ivar (#273)
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- Reject duplicate SSE connections with 409 to prevent stream hijacking
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## [0.9.1] - 2026-03-23
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### Added
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- Allow `Client#call_tool` to accept a tool name (#266)
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### Fixed
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- Return 404 for invalid session ID in `handle_delete` (#261)
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## [0.9.0] - 2026-03-20
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### Added
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- `MCP::Client::Stdio` transport (#262)
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- Progress notifications per MCP specification (#254)
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- Automatic `_meta` parameter extraction support (#172)
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- CORS and Accept wildcard support for browser-based MCP clients (#253)
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### Changed
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- Use `autoload` to defer loading of unused subsystems (#255)
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- Reduce release package size (#239)
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### Fixed
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- Return 404 for invalid session ID in `handle_regular_request` (#257)
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- Use mutex-protected `session_exists?` in `handle_regular_request` (#258)
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## [0.8.0] - 2026-03-03
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### Added
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- `Content::EmbeddedResource` class for embedded resource content type (#244)
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- `Content::Audio` class for audio content type (#243)
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- `$ref` support in `Tool::Schema` for protocol version 2025-11-25 (#242)
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- MCP conformance test suite (#248)
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### Fixed
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- Handle `Errno::ECONNRESET` in SSE stream operations (#249)
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- Fix default handler return values to comply with MCP spec (#247)
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- Fix `Prompt#validate_arguments!` crash when arguments are `nil` (#246)
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- Return 202 Accepted for SSE responses per MCP spec (#245)
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- Fix `Content::Image#to_h` to return `mimeType` (camelCase) per MCP spec (#241)
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## [0.7.1] - 2026-02-21
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### Fixed
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- Fix `Resource::Contents#to_h` to use correct property names per MCP spec (#235)
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- Return JSON-RPC protocol errors for unknown tool calls (#231)
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- Fix `logging/setLevel` to return empty hash per MCP specification (#230)
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## [0.7.0] - 2026-02-14
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### Added
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- `logging` support (#103)
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- Protocol version negotiation to server initialization (#223)
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- Tool arguments to instrumentation data (#218)
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- Client info to instrumentation callback (#221)
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- `resource_templates` to `MCP::Client` (#225)
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### Changed
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- Extract `MCP::Annotations` into a dedicated file (#224)
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### Fixed
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- `Resource::Embedded` not setting `@resource` in `initialize` (#220)
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## [0.6.0] - 2026-01-16
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### Changed
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- Update licensing to Apache 2.0 for new contributions (#213)
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### Fixed
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- Omit `icons` from responses when empty or nil to reduce context window usage (#212)
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## [0.5.0] - 2026-01-11
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### Added
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- Protocol specification version "2025-11-25" support (#184)
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- `icons` parameter support (#205)
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- `websiteUrl` parameter in `serverInfo` (#188)
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- `description` parameter in `serverInfo` (#201)
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- `additionalProperties` support for schema validation (#198)
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- "Draft" protocol version to supported versions (#179)
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- `stateless` mode for high availability (#101)
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- Exception messages for tool call errors (#194)
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- Elicitation skeleton (#178)
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- `prompts/list` and `prompts/get` support to client (#163)
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- Accept header validation for HTTP client transport (#207)
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- Ruby 2.7 - Ruby 3.1 support (#206)
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### Changed
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- Make tool names stricter (#204)
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### Fixed
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- Symlink path comparison in schema validation (#193)
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- Duplicate tool names across namespaces now raise an error (#199)
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- Tool error handling to follow MCP spec (#165)
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- XSS vulnerability in json_rpc_handler (#175)
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## [0.4.0] - 2025-10-15
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### Added
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- Client resources support with `resources/list` and `resources/read` methods (#160)
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- `_meta` field support for Tool schema (#124)
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- `_meta` field support for Prompt
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- `title` field support for prompt arguments
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- `call_tool_raw` method to client for accessing full tool responses (#149)
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- Structured content support in tool responses (#147)
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- AGENTS.md development guidance documentation (#134)
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- Dependabot configuration for automated dependency updates (#138)
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### Changed
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- Set default `content` to empty array instead of `nil` (#150)
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- Improved prompt spec compliance (#153)
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- Allow output schema to be array of objects (#144)
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- Return 202 response code for accepted JSON-RPC notifications (#114)
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- Added validation to `MCP::Configuration` setters (#145)
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- Updated metaschema URI format for cross-OS compatibility
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### Fixed
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- Client tools functionality and test coverage (#166)
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- Client resources test for empty responses (#162)
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- Documentation typos and incorrect examples (#157, #146)
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- Removed redundant transport requires (#154)
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- Cleaned up unused block parameters and magic comments
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## [0.3.0] - 2025-09-14
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### Added
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- Tool output schema support with comprehensive validation (#122)
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- HTTP client transport layer for MCP clients (#28)
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- Tool annotations validation for protocol compatibility (#122)
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- Server instructions support (#87)
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- Title support in server info (#119)
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- Default values for tool annotation hints (#118)
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- Notifications/initialized method implementation (#84)
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### Changed
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- Make default protocol version the latest specification version (#83)
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- Protocol version validation to ensure valid values (#80)
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- Improved tool handling for tools with no arguments (#85, #86)
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- Better error handling and response API (#109)
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### Fixed
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- JSON-RPC notification format in Streamable HTTP transport (#91)
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- Errors when title is not specified (#126)
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- Tools with missing arguments handling (#86)
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- Namespacing issues in README examples (#89)
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## [0.2.0] - 2025-07-15
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### Added
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- Custom methods support via `define_custom_method` (#75)
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- Streamable HTTP transport implementation (#33)
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- Tool argument validation against schemas (#43)
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### Changed
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- Server context is now optional for Tools and Prompts (#54)
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- Improved capability handling and removed automatic capability determination (#61, #63)
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- Refactored architecture in preparation for client support (#27)
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### Fixed
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- Input schema validation for schemas without required fields (#73)
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- Error handling when sending notifications (#70)
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## [0.1.0] - 2025-05-30
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Initial release in collaboration with Shopify
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