Looks like it will work. Have you tested it with an actual copy of Zed, to make sure the Zed Agent can use the PlanetScale mcp?
The implementations for Claude Desktop, Cursor, and Zed are redundant and all a bit different here. If you're into it, it could use a refactor so there's a single function that handles things like creating the containing directory, saving a backup file, and adding our config to the overall JSONC blob. (You can parse all three files as JSONC, even though we expect Claude and Cursor not to have any comments.) It could take the directory, the basename of the JSON config file, and a function parameter that modifies the deserialized JSON object to add the right config to it.

@piki :) yes it works, tried it on my local installation - yes i would be down to clean it up further, should i do it on the same PR?