.mcp rule to control format of git commit messages

I generally like the git commit messages that Cursor can auto-generate.

However, I’d like to be able to tweak a few things about them, and the obvious mechanism would be an MCP file that could be auto-attached to “generate a commit message request.”

As far as I can tell, there’s no mechanism for me to do this? How about another “Rule Type” in the MCP editor called something obvious.