Simon Willison’s Weblog

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Wednesday, 29th July 2026

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TIL Adding a custom MCP server to Claude and ChatGPT — I've started exploring [MCP](https://modelcontextprotocol.io/) 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.
29th Jul 2026, 12:13 am · ai, generative-ai, chatgpt, llms, claude, model-context-protocol
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