Support for MCP

[arunsworld]

Description

Agent is lacking support for integration with MCP servers. Reckon it should be quite straightforward to add support to the agent via an option like WithMCPServer(...). This would introspect the MCP server and add to the list of tools available. Given that AgentTool is already an interface, we would just need an MCP implementation for the Run method.

Happy to submit a PR if desired.

[joeblew999]

This would be awesome

This has it in MCP folder at https://github.com/yarlson/gic/tree/master/internal

[gali-leilei]

like WithMCPServer(...)

I would argue against it. This brings unnecessary dependencies into fantasy.

How about just func adapt(c *mcp.Client) ([]fantasy.AgentTool, error)?

• It works with WithTools().
• User handles lifecycle of mcp.Server, mcp.Client and the transport between them.
• This function handles the conversion of tool call arguments between fantasy land and mcp land.

I am not sure where to put it though, here or a separate package like charm.land/fantasy/tool-adapter/mcp.

[arunsworld]

@gali-leilei, I fully agree with you.

I was able to implement MCP successfully without requiring change to the fantasy library. The abstractions work very well.

I thought perhaps we could share it as an example in the repo but I believe that will bring in the dependency anyway and not very satisfying.

I do believe it makes sense for a separate repo to have these extensions/adapters that folks can use if they so need.

The other piece I was able to implement that the community might find valuable is AG-UI support (https://github.com/ag-ui-protocol/ag-ui). A collection of such things would make sense in that repo.

If you guys want to have an official repo for these I'm happy to contribute to it. Alternatively, if you feel it's not part of your core, I'm happy to maintain a repo and share the link, and you guys can link to it if you wish in the documentation.

[joeblew999]

That example would be fab