MCP-Go SDK

What is MCP-Go SDK?

A Go SDK for building Model Communication Protocol (MCP) tools and servers. It provides the building blocks to implement MCP‑compliant tools that can be integrated with AI applications such as Cursor IDE. The SDK is designed for Go developers who want to create custom tools that communicate with AI clients using the MCP standard.

How to use MCP-Go SDK?

Create a Go module, implement the mcp.Tool interface (methods Name(), Description(), Schema(), Execute()), then instantiate a server with the default stdio transport, register the tool, and call Start(). A complete working example is provided in servers/example. To use the tool with Cursor IDE, create a .cursor/mcp.json file in your project root with the command and arguments.

Key features of MCP-Go SDK

• Implements the Model Communication Protocol (MCP) for Go
• Defines a clear Tool interface with required methods
• Provides a flexible Transport interface with built‑in stdio support
• Enforces a standard MCP response format (content + optional metadata)
• Includes an example server to get started quickly

Use cases of MCP-Go SDK

• Building custom MCP tools that can be called by AI applications like Cursor IDE
• Creating an echo tool that returns input messages with metadata
• Extending the SDK with custom transports beyond stdio
• Developing reusable MCP‑compliant services for integration with AI clients

FAQ from MCP-Go SDK

What is the MCP-Go SDK?

It is a Go SDK for building Model Communication Protocol (MCP) tools and servers. It provides the interfaces and default implementations needed to create MCP‑compliant tools.

What are the runtime requirements to use the SDK?

You need a Go development environment. The SDK itself is imported as a Go module; no external runtime dependencies beyond the Go standard library are mentioned.

How do I register a tool and start the server?

Create a new server with server.NewServer(transport.NewStdioTransport()), register your tool with srv.RegisterTool(&MyTool{}), then start it with srv.Start(). Your tool must implement the mcp.Tool interface.

How can I integrate my MCP tool with Cursor IDE?

Create a .cursor/mcp.json file in your project root with the command and optional arguments. See the Configuration section in the README for the exact JSON structure.

What transport options are available?

The SDK includes a stdio transport (transport.NewStdioTransport()). The Transport interface is extensible, allowing you to implement custom transports (e.g., WebSocket or HTTP) if needed.