fsi-mcp integration, a thought

[dgrimmin]

Good morning Goswin,

This is just an idea I want to run by you.

A week ago in F# weekly, there was a post about an mcp server for F# interactive. The goal by Jo van Eyck was to have an LLM agent support the F# scripting, not only by having access to the F# script, but also to the fsi input/output.

Last week I gave it a try using fsi-mcp-server, and it does improve my REPL experience by opting-in the LLM support when I think it is helpful. For example, I can point the LLM agent to the Autodesk API documentation, and it does seem to grasp how to use it.

The way fsi-mcp seems to work, is to let your IDE call an fsi-mcp-server.exe instead of fsi.exe directly and it seems to happen in here. The fsi.exe stdin/stdout is redirected via this executable, which in turn accepts the stdin from your IDE, or listens to a port for the LLM input output. All in all a pretty lightweight but robust setup.

Now for my question: do you think Fesh.Revit could be opened up in a similar fashion (mcp service style) to the outside world? That would mean a path for an LLM agent to drive a part of the Revit modelling. I am aware you do not use fsi.exe, but the F# compiler service, but that should bring the same capabilities.

Curious to hear your perspective on this.

All the best, Dennis

[goswinr]

That sounds cool. I haven't yet used any of those MCPs yet. Do you want to give me a short call to show me what you did? goswin@rothenthal.com

[dgrimmin]

Just sent you an email, let me know if you did not get is.

[dgrimmin]

Good morning Goswin,

The last couple of days after our discussion a lot of configurations past my mind to get something of a loop going between LMM<->Fesh.Revit<->Revit. It is a very appealing idea to have such a tool available.

The simplest configuration that came to mind was this one. There is already a fsi-mcp server by @jovaneyck. It can compose Fesh.Revit scripts, but it cannot execute them, and therefore it cannot get anything into Revit and get no feedback to the LLM. Now what if Fesh.Revit were to have a trigger that can be triggered by an external call to load an updated version of the script on its screen, and then execute it. That would give the LLM access to manipulate the Revit model via Fesh. For the feedback part it would be enough to let the script write to a F# scriptfile with the relevant feedback, e.g. available objects, coordinates, etc. This feedback can be read into the external fsi that the LLM has access to.

Do you think that you can, and are you willing to, make such a trigger available from Fesh.Revit?

[goswinr]

I would be open to this, the change would probably go directly into Fesh, not sure when though.

[dgrimmin]

Good to hear you are open to the idea. Perfectly understandable it is not at the top of your to do list. Maybe a good reason for me to have a go with Serena on the Fesh codebase and see how far I get.

I wish you a pleasant Christmas and end of year/new year celebration period!