Possibly to get an MCP trace

[reflek-chris]

With the newly added MCP server, would it be possible to also get logs piped to an mcp.log.json file similar to how we do the lsp/bsp ones if they exist? For example I heavily use claude code and often I see things like this:

⏺ metals:compile-file (MCP)(fileInFocus: "/Users/chriskipp/Documents/scala-workspace/<path to my file>")
  ⎿  Compilation cancelled or incorrect file path

⏺ Bash(sbt "application/compile")

So it seems that often Metals fails to be able to handle this request without really providing a lot of data. There are ways to try and find this in the claude logs, but first you need to find them, which is a challenge, and second they are just all crammed together so there isn't an easy way to debug them. Having something like this would be great to debug these situations.

[tgodzik]

I managed to get something working in #7584 what do you think?

[reflek-chris]

Hey! I just gave it a try and yes, it seems to work!