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by simonw 392 days ago
Yeah I had a bit of an experiment with MCP this morning, to see if I could get a quick plugin demo out for it. It's a bit tricky! The official mcp Python library really wants you to run asyncio and connect to the server and introspect the available tools.
1 comments
mihau 391 days ago
Hi Simon!

I'm a heavy user of the llm tool, so as soon as I saw your post, I started tinkering with MCP.

I’ve just published an alpha version that works with stdio-based MCP servers (tested with @modelcontextprotocol/server-filesystem) - https://github.com/Virtuslab/llm-tools-mcp. Very early stage, so please make sure to use with --ta option (Manually approve every tool execution).

The code is still messy and there are a couple of TODOs in the README.md, but I plan to work on it full-time until the end of the week.

Some questions:

Where do you think mcp.json should be stored? Also, it might be a bit inconvenient to specify tools one by one with -T. Do you think adding a --all-tools flag or supporting glob patterns like -T name-prefix* in llm would be a good idea?

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simonw 391 days ago
OK this looks like a very promising start!

You're using function-based tools at the moment, hence why you have to register each one individually.

The alternative to doing that is to use what I call a "toolbox", described here: https://llm.datasette.io/en/stable/python-api.html#python-ap...

Those get you two things you need:

1. A single class can have multiple tool methods in it, you just have to specify it once 2. Toolboxes can take configuration

With a Toolbox, your plugin could work like this:

  llm -T 'MCP("path/to/mcp.json")' ...
You might even be able to design it such that you don't need a mcp.json at all, and everything gets passed to that constructor.

There's one catch: currently you would have to dynamically create the class with methods for each tool, which is possible in Python but a bit messy. I have an open issue to make that better here: https://github.com/simonw/llm/issues/1111

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mihau 391 days ago
Thanks for feedback!

Ah, I saw "llm.Toolbox" but I thought it's just for plugin developer convenience.

I'll take a look at the issue you posted (#1111). Maybe I can contribute somehow :).

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