Model Context Protocol SDK for Go

A Go implementation of the Model Context Protocol (MCP).

Overview

This SDK provides a comprehensive implementation of MCP in Go, allowing developers to:

• Create MCP clients to connect to MCP servers
• Build MCP servers that provide context and capabilities
• Handle all core MCP features: resources, prompts, tools, and more
• Support for both stdio and SSE transport

Examples

The SDK includes several example implementations:

Standard stdio Examples

See the example client that runs the example servers:

• prompts
• tools
• resources

SSE Transport Examples

See the SSE (Server-Sent Events) transport examples:

• SSE server
• SSE client

Running the Examples

Run the stdio-based examples with different servers:

• make run-client-prompts
• make run-client-tools
• make run-client-resources

Run the SSE examples (in separate terminals):

1. Start the SSE server: make run-sse-server
2. Start the SSE client: make run-sse-client

The SSE examples accept command-line flags:

• Server: --addr to specify listen address (default ":8080")
• Client: --server to specify server address (default "localhost:8080")

Development Status

This SDK is currently in development. While core functionality is implemented, some features are still in progress:

• notifications/cancelled for request cancellation
• notifications/progress for long-running operations
• logging/setLevel and notifications/message for logs
• SSE transport
• Advanced examples

License

MIT License