Adding a custom MCP server to Claude and ChatGPT

I've started exploring MCP in more detail. The web chat UIs for both Claude and ChatGPT can access MCP servers but it's not obvious how to set them up. Here's what I figured out. I'm using my new unauthenticated MCP for my blog - https://datasette.simonwillison.net/-/mcp - which uses https://github.com/datasette/datasette-mcp to allow the execution of read-only SQL queries against a copy of my…