# Changelog
All notable changes to this project are documented in this file.
## [0.4.0](https://github.com/cloudwalk/hermes-mcp) - 2025-05-06
### Added
- Implemented WebSocket transport (#70)
- Emit `telemetry` events (#54)
- Implement client feature `completion` request (#72)
- Implement client feature roots, server requests (#73)
## [0.3.12](https://github.com/cloudwalk/hermes-mcp) - 2025-04-24
### Fixed
- Correctly handles "nested" timeouts (genserver vs MCP) (#71)
## [0.3.11](https://github.com/cloudwalk/hermes-mcp) - 2025-04-17
### Added
- Improved core library logging and added verbosity level on interactive/CLI (#68)
## [0.3.10](https://github.com/cloudwalk/hermes-mcp) - 2025-04-17
### Fixed
- Handle SSE ping and reconnect events from server (#65)
## [0.3.9](https://github.com/cloudwalk/hermes-mcp) - 2025-04-15
### Fixed
- Improved and simplified SSE endpoint event URI merging (#64)
### Added
- Added internal client/transport state inspection on CLI/mix tasks (#61)
## [0.3.8](https://github.com/cloudwalk/hermes-mcp) - 2025-04-10
### Added
- Created `Operation` struct to standardize client API calls (#56)
- Fixed ERTS version to avoid release errors
### Fixed
- Resolved client timeout confusion by standardizing timeout handling (#42)
## [0.3.7](https://github.com/cloudwalk/hermes-mcp) - 2025-04-01
### Fixed
- Client reinitialization from interactive CLI (#55)
## [0.3.6](https://github.com/cloudwalk/hermes-mcp) - 2025-03-28
### Added
- New roadmap and protocol update proposal (#53)
- Added documentation for the 2025-03-26 protocol update
## [0.3.5](https://github.com/cloudwalk/hermes-mcp) - 2025-03-25
### Documentation
- Added Roadmap to README (#47)
## [0.3.4](https://github.com/cloudwalk/hermes-mcp) - 2025-03-20
### Added
- `help` command and flag on the interactive CLI (#37)
- improve SSE connection status on interactive task/cli (#37)
## [0.3.3](https://github.com/cloudwalk/hermes-mcp) - 2025-03-20
### Added
- Client request cancellation support (#35)
- Improved URI path handling for SSE transport (#36)
- Enhanced interactive mix tasks for testing MCP servers (#34)
## [0.3.2](https://github.com/cloudwalk/hermes-mcp) - 2025-03-19
### Added
- Ship static binaries to use hermes-mcp as standalone application
## [0.3.1](https://github.com/cloudwalk/hermes-mcp) - 2025-03-19
### Added
- Ship interactive mix tasks `stdio.interactive` and `sse.interactive` to test MCP servers
## [0.3.0](https://github.com/cloudwalk/hermes-mcp) - 2025-03-18
### Added
- Structured server-client logging support (#27)
- Progress notification tracking (#26)
- MCP domain model implementation (#28)
- Comprehensive SSE unit tests (#20)
- Centralized state management (#31)
- Standardized error response handling (#32)
### Fixed
- Improved domain error handling (#33)
## [0.2.3](https://github.com/cloudwalk/hermes-mcp) - 2025-03-12
### Added
- Enhanced SSE transport with graceful shutdown capabilities (#25)
- Improved SSE streaming with automatic reconnection handling (#25)
## [0.2.2](https://github.com/cloudwalk/hermes-mcp) - 2025-03-05
### Added
- Support for multiple concurrent client <> transport pairs (#24)
- Improved client resource management
## [0.2.1](https://github.com/cloudwalk/hermes-mcp) - 2025-02-28
### Added
- Support for custom base and SSE paths in HTTP/SSE client (#19)
- Enhanced configuration options for SSE endpoints
## [0.2.0](https://github.com/cloudwalk/hermes-mcp) - 2025-02-27
### Added
- Implemented HTTP/SSE transport (#7)
- Support for server-sent events communication
- HTTP client integration for MCP protocol
- Streaming response handling
### Documentation
- Extensive guides and documentation improvements
## [0.1.0](https://github.com/cloudwalk/hermes-mcp) - 2025-02-26
### Added
- Implemented STDIO transport (#1) for MCP communication
- Support for bidirectional communication via standard I/O
- Automatic process monitoring and recovery
- Environment variable handling for cross-platform support
- Integration test utilities in Mix tasks
- Created stateful client interface (#6)
- Robust GenServer implementation for MCP client
- Automatic initialization and protocol handshake
- Synchronous-feeling API over asynchronous transport
- Support for all MCP operations (ping, resources, prompts, tools)
- Proper error handling and logging
- Capability negotiation and management
- Developed JSON-RPC message parsing (#5)
- Schema-based validation of MCP messages
- Support for requests, responses, notifications, and errors
- Comprehensive test suite for message handling
- Encoding/decoding functions with proper validation
- Established core architecture and client API
- MCP protocol implementation following specification
- Client struct for maintaining connection state
- Request/response correlation with unique IDs
- Initial transport abstraction layer
### Documentation
- Added detailed RFC document describing the library architecture
- Enhanced README with project overview and installation instructions
