Field notes and data from a Model Context Protocol server that runs in production, plus the weekly census of the AI-chat connector directories.https://yesmcp.com/enhttps://yesmcp.com/writing/claude-connectors-for-business/https://yesmcp.com/writing/claude-connectors-for-business/The claude.ai directory holds 2,105 connectors as of our count of 2026-08-24, and almost none of them are ordinary service businesses. What a connector is, how clients install one, and how a custom build works, from a company that runs its own in production.Tue, 25 Aug 2026 00:00:00 GMThttps://yesmcp.com/writing/spec-shipped-after-its-sdk/https://yesmcp.com/writing/spec-shipped-after-its-sdk/The stateless rewrite landed on 28 July with a twelve-month migration window. The TypeScript SDK that would implement it was published on 27 July, and it tops out at the November 2025 protocol. Nobody is migrating yet. Worth knowing before you plan a sprint.Mon, 10 Aug 2026 00:00:00 GMThttps://yesmcp.com/writing/tool-results-read-as-injection/https://yesmcp.com/writing/tool-results-read-as-injection/I put behaviour rules in the text my tools returned, because the proper channel never reached the model. Then a user watched the host warn them that this connector had tried to inject malicious instructions. About the shape of it, the detector was right.Mon, 10 Aug 2026 00:00:00 GMThttps://yesmcp.com/writing/what-the-host-does-not-deliver/https://yesmcp.com/writing/what-the-host-does-not-deliver/A field guide to the channels between your server and the model: which ones arrive, which quietly do not, and what each one costs. Four findings, none of them from reading the specification.Mon, 10 Aug 2026 00:00:00 GMT