mcp-daemon

Overview

The most advanced and complete implementation of the Model Context Protocol (MCP) specification. This Rust implementation goes beyond the standard specification to provide:

• Full Specification Coverage: Implements every feature from the latest MCP spec
• Production-Grade Error Handling: Comprehensive error system with recovery mechanisms
• Advanced Transport Layer: Robust implementations of all transport types with detailed error tracking
• Type-Safe Architecture: Leveraging Rust’s type system for compile-time correctness
• Real-World Ready: Production-tested with Claude Desktop compatibility

This library sets the standard for MCP implementations with its comprehensive feature set and robust error handling.

Note: While this implementation provides the most complete coverage of the MCP specification, including features like sampling, roots, and completion that are not yet available in other implementations, it is still under active development.

Installation

Add this to your Cargo.toml:

[dependencies]
mcp_daemon = "0.2.1"

Overview

This is an implementation of the Model Context Protocol defined by Anthropic, with extensive modifications and improvements.

Repository

The mcp-daemon repository can be found at: https://github.com/entrepeneur4lyf/mcp-daemon

Features

Supported Transports

HTTP-Based Transports

• Server-Sent Events (SSE): Robust unidirectional server-to-client communication with automatic keep-alive
• WebSocket: Full-duplex communication with comprehensive error handling and connection management

Other Transports

• Standard IO (Stdio): For command-line and process-based communication
• In-Memory Channel: Efficient inter-process communication using Tokio channels

Transport Implementation Details

HTTP Transport Layer

The HTTP transport layer provides a unified interface for both SSE and WebSocket connections:

Server-Side Events (SSE)

• Efficient unidirectional communication from server to client
• Automatic keep-alive with configurable intervals (default: 15 seconds)
• Comprehensive event types support (data, named events, comments)
• JSON serialization for structured messages
• Built on actix-web-lab for robust server implementation

WebSocket Transport

• Full-duplex communication with message broadcasting
• Header customization support for authentication and session management
• Robust error handling with specific error codes and messages
• Connection lifecycle management (open, close, reconnect)
• Built on tokio-tungstenite for async WebSocket support

Common Features