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/what-data-can-claude-access-through-connectors/https://yesmcp.com/writing/what-data-can-claude-access-through-connectors/Does Claude see my customer list? What does the chat send to my server? Can one customer see another's booking? Seven questions owners ask, short answers, each checked against a live business connector.Fri, 11 Sep 2026 00:00:00 GMThttps://yesmcp.com/writing/who-the-connectors-serve/https://yesmcp.com/writing/who-the-connectors-serve/Three categories of the claude.ai directory walked card by card and labelled by who they serve. Of 170 cards, 18 face a customer at all, and 6 belong to a business answering its own clients. The dataset and the labelling rule are published.Fri, 04 Sep 2026 00:00:00 GMThttps://yesmcp.com/writing/claude-connectors-for-business/https://yesmcp.com/writing/claude-connectors-for-business/The claude.ai directory holds 2,383 connectors as of our count of 2026-09-04, 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