Adding a custom MCP server to Claude and ChatGPT

· Simon Willison TIL · July 29, 2026, 12:44 a.m.
Web Development integration chatgpt claude
Summary
This blog post provides a step-by-step guide on how to add a custom MCP server to both Claude and ChatGPT, detailing the process for integration and potential limitations, particularly in ChatGPT's advanced voice mode.
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