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grpcmcp MCP Server

@adiom-data

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基本情報

カテゴリ

その他

ライセンス

Apache-2.0

トランスポート

stdio

作者

adiom-data

投稿者

Mark Chua

grpcmcp MCP Server について

MCP Server for gRPC

#golang#mcp#grpc

grpcmcp MCP Server の設定

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grpcmcp MCP Server のツール

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概要

What is grpcmcp?

grpcmcp is an MCP server that proxies to a gRPC backend using a provided protobuf descriptor file or server reflection. It exposes unary gRPC methods as MCP tools for AI agents and clients.

How to use grpcmcp?

Install with go install github.com/adiom-data/grpcmcp, then run with flags like --reflect for reflection or --descriptors for a descriptor file. Use --hostport to serve over HTTP (Streamable HTTP or SSE) or configure via command/args in an MCP client for STDIN transport.

Key features of grpcmcp

  • Proxies to gRPC backends using reflection or descriptor files
  • Exposes unary gRPC methods as MCP tools
  • Supports Streamable HTTP, legacy SSE, and STDIN transports
  • Filters services with the --services flag
  • Attaches Bearer tokens or custom headers to backend calls
  • Can be embedded as a Go library

Use cases of grpcmcp

  • Enable AI agents to call gRPC services via natural language
  • Bridge existing gRPC infrastructure to MCP-compatible clients
  • Expose selected gRPC endpoints through a controlled MCP interface

よくある質問

1

What gRPC methods does grpcmcp support?

Only unary gRPC methods are exposed as MCP tools. Client-streaming, server-streaming, and bidi-streaming methods are skipped.

2

What transports does grpcmcp support for client connections?

grpcmcp supports Streamable HTTP (default when `--hostport` is set), legacy SSE, and STDIN transport.

3

Can grpcmcp be used as a Go library?

Yes, it can be embedded via `grpcmcp.NewServer()` with a `Config` struct, allowing custom descriptor loading, HTTP clients, and dynamic header providers.

4

How does authentication work with grpcmcp?

Outbound backend auth is configured via `--bearer`, `--bearer-env`, or `--header` flags. For dynamic auth, use `ToolHeaderProvider` in library mode. Inbound MCP auth is handled by wrapping the HTTP handler with standard Go middleware.

5

How are 64-bit integers handled in MCP schemas?

With the `--string64` flag, 64-bit protobuf integer fields (`int64`, `uint64`, etc.) are exposed only as strings in MCP JSON schemas to avoid precision loss for JavaScript clients.

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