Feature Request: Add MCP Support

[roychri]

Is your feature request related to a problem? Please describe.

Anthropic just released MCP which will simplify how we can integrate new and diverse tools to LLM apps like this one. It would be useful and it would augment the value of mods if users could indicate if they want mods to talk to their SQLlite, or access files on their filesystem, or query some API, etc...
This would not only be supported by Anthropic models but any models which understand tools/function calling.
Anthropic released Python and Typescript SDK but people have started making GO equivalent.
Here's one: https://github.com/mark3labs/mcp-go (not affiliated)
And I think more will have appeared once you read this :-)

Describe the solution you'd like

Add in support for MCP Client to Mods and
Allow the user to specify in the config the various MCP Server they would like the LLM to access.

Something like:

mcpServers:
    sqlite:
        command: "uvx",
        args: ["mcp-server-sqlite", "--db-path", "/Users/YOUR_USERNAME/test.db"]

And then the user would be able to do:

$ mods how many users do I have in my sqlite?

and it would send the requests/calls using JSONRPC over Stdio or SSE Transports to fetch the data necessary to get a response.
There's already a number of MPC Server available like fetching web pages and sending messages on slack to name a few:
https://github.com/modelcontextprotocol/servers

Describe alternatives you've considered

No alternative since this might be the one common solution that will be the most successful/popular.
I do not know golang and I do not know if that go mcp sdk is mature enough to be used in this way yet.
But I thought I would see if anyone would be interested in using or implementing this.

Additional context

• https://www.anthropic.com/news/model-context-protocol
• https://modelcontextprotocol.io/docs/concepts/architecture
• https://spec.modelcontextprotocol.io/
• https://github.com/modelcontextprotocol/typescript-sdk

[ezynda3]

+1 to this!!!

[ezynda3]

I'm the creator of the the Go SDK mentioned. It already supports clients for both the stdio and SSE transports. The Claude desktop app currently only supports stdio clients and most of the currently available servers as well.

Also this is my first go library so would be happy to have some more experienced Go devs have a look and possibly contribute even if just suggesting improvements.

Cheers!

[caarlos0]

this would be awesome to add indeed! happy to help implementing/reviewing it if anyone is interested in helping :D

[ivishalgandhi]

+1

[roychri]

I've been trying to make progress on this... just a proof of concept really...

I have no experience in Go. I've been using AI to try to make progress on this. I can add the various data structure changes and call the Claude LLM which respond with a stream to call a tool/function, BUT, I cannot have "mods" see this tool call request, so I am not even at the step of calling the function and loop back. I am not familiar with how BubbleTea works. And the AI doesn't seem to know how that works either 😆

I could use some help here. I'll work on getting my current progress on a fork so you can see... and perhaps someone could even contribute? Maybe if I can get passed this hurdle I can continue with AI a bit more...

I'm focusing on getting it to work on Anthropic Claude as a first step, before trying to make it work on ALL models.