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1 points by gk1 36s ago 0 comments

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Show HN: I rawdog a MCP server from scratch in Zig. No SDK

9 ww520 1 6/25/2025, 6:14:22 PM github.com ↗

Some time ago I wanted to write a MCP server in Zig but found out there's no real JSON-RPC support in Zig, which MCP needs for communication. I ended up developing a JSON-RPC 2.0 library in Zig and more [1], which had its challenges.

So I finally was able to put together a MCP server in Zig. It's built from scratch implementing the protocol messages from the MCP JSON schema. It's actually quite magical to have the LLM calling my MCP server [2].

The work is not too bad. Most of the hard work has already been done in the JSON-RPC library.

[1] https://github.com/williamw520/zigjr

[2] https://github.com/williamw520/zigjr?tab=readme-ov-file#run-...

Comments (1)

brian_herman · 1h ago

Nice