Model Context Protocol (MCP) Implementation in Go

What is Model Context Protocol (MCP) Implementation in Go?

This Go implementation of the Model Context Protocol enables communication between LLM hosts (e.g., clients) and servers that provide contextual information, tools, prompts, or resources. It includes type-safe Go struct definitions and a client library for JSON‑RPC based interaction.

How to use Model Context Protocol (MCP) Implementation in Go?

Set the MCP_SERVER_URL environment variable (defaults to http://localhost:3000/jsonrpc) and run go run examples/mcp_client_example.go. Use the mcp.NewClient(url) function to create a client, then call methods like Initialize, ListResources, ReadResource, CallTool, and GetPrompt.

Key features of Model Context Protocol (MCP) Implementation in Go

• Go struct definitions translated from the TypeScript schema
• Client implementation with initialize, list, read, and call methods
• Helper functions for handling polymorphic types via json.RawMessage
• Supports Resources, Tools, Prompts, and Roots of the MCP specification
• Example code demonstrating basic client usage

Use cases of Model Context Protocol (MCP) Implementation in Go

• Building LLM-powered applications that need to read external resources
• Calling server-side tools on behalf of a language model
• Using pre‑defined prompt templates from a remote server
• Operating on filesystem or data roots provided by the server

FAQ from Model Context Protocol (MCP) Implementation in Go

What is the Model Context Protocol?

It is a JSON‑RPC based protocol for communication between model hosts and servers, enabling access to resources, tools, prompts, and data roots.

What are the prerequisites to use this implementation?

You need Go 1.18 or later. No other runtime dependencies are required.

How do I run the example client?

Set the MCP_SERVER_URL environment variable (optional) and execute go run examples/mcp_client_example.go.

What client methods are available?

The client provides Initialize, ListResources, ReadResource, CallTool, GetPrompt, and methods for converting Go structs to JSON‑RPC messages.

Can I contribute to this project?

Yes. Contributions include implementing a server, adding WebSocket support, improving error handling, adding tests, and documenting additional use cases.