go-sdk
Official Go SDK for building MCP servers and clients
The Lens
Official Go SDK for building MCP servers and clients. Handles the JSON-RPC transport, tool registration, resource management, and OAuth primitives so you write the business logic.
Standard Go module install. Well-documented with example implementations. Supports the full MCP specification including streaming and sampling.
Maintained by the Model Context Protocol organization. Free, open source. If you're building MCP servers in Go, this is the canonical choice. Equivalent to FastMCP for Python but for the Go ecosystem.
Free vs Self-Hosted vs Paid
fully freeFree Tier
The MCP server itself is completely free and open source. Install it, configure your MCP client, and use it without any cost.
Self-Hosted
Runs locally or on your own infrastructure. No external dependencies beyond the service it connects to.
Paid
No paid tier. The MCP server is free. The underlying service may have its own pricing.
Free and open source.
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About
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- modelcontextprotocol (Organization)
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