fastmcp-go

[](https://go.dev) [](LICENSE) []() []()

> Go reimplementation of fastmcp — the de facto MCP server framework. > Single binary, zero dependencies, native concurrency.

fastmcp (Python, 24K stars) is the most popular MCP server framework, powering ~70% of MCP servers. But it has structural limitations:

• 20+ dependencies with 50+ transitive deps — version conflicts break installs
• Python runtime required — needs pip, venv, interpreter
• 1-3 second startup — import time alone costs hundreds of milliseconds
• GIL-limited concurrency — asyncio is single-threaded
• Known bugs in schema generation, timeouts, concurrent tools, STDIO termination

fastmcp-go is a ground-up Go reimplementation that fixes these issues:

| Dimension | fastmcp (Python) | fastmcp-go | |-----------|-----------------|------------| | Startup | 1-3 seconds | <50ms | | Binary | Python + pip + venv | Single static binary | | Memory | ~50MB base | ~5MB base | | Dependencies | 20+ direct, 50+ transitive | Zero | | Concurrency | asyncio (single-threaded) | goroutines (true parallelism) | | Type Safety | Runtime (Pydantic) | Compile-time (structs) | | Deployment | pip install + config | Copy one binary |

go install github.com/JSLEEKR/fastmcp-go/cmd/fastmcp-go@latest

Or build from source:

git clone https://github.com/JSLEEKR/fastmcp-go.git
cd fastmcp-go
go build -o fastmcp-go ./cmd/fastmcp-go

package main

import (