Protoc Gen Go MCP Server

What is Protoc Gen Go Mcp?

Protoc Gen Go Mcp is a Protocol Buffers compiler plugin that generates Model Context Protocol (MCP) servers for gRPC or ConnectRPC APIs. It auto-generates JSON Schema for tool inputs and is MCP-library-agnostic, supporting both the official Go SDK and mark3labs/mcp-go.

How to use Protoc Gen Go Mcp?

Add the plugin to your buf.gen.yaml, then run buf generate to produce *.pb.mcp.go files. In your Go server code, import the adapter for your chosen MCP library (gosdk or mark3labs), create a server, and register handlers using generated Register*Handler functions. Forward tool calls to gRPC or ConnectRPC clients with generated ForwardTo*Client functions.

Key features of Protoc Gen Go Mcp

• Auto-generates MCP handlers from .proto services
• Outputs JSON Schema for method inputs
• Wire up to gRPC or ConnectRPC servers/clients
• Easy integration with buf build tool
• Runtime LLM provider selection (Standard/OpenAI)
• MCP library agnostic (official SDK and mark3labs)

Use cases of Protoc Gen Go Mcp

• Expose existing gRPC APIs as MCP tools for AI assistants
• Forward MCP tool calls to remote gRPC clients with zero boilerplate
• Namespace multiple service instances (e.g., different databases) via tool name prefixing
• Use with buf to generate MCP servers alongside standard .pb.go files