Membership lesson · Build Your Jarvis · Module 9 — The plug socket (MCP)

The plug socket — other people's tools, your rules

The read-first opener for Module 9 — the module that makes Jarvis endlessly expandable. Before any code, the mental model: what MCP actually is (one standard plug socket for assistant tools, foundation-governed, roughly ten thousand public plugs and counting), why this project built the hand-rolled loop first and the socket second — because a stranger's tool about to land in your registry only makes sense if you understand tool calling, and because it means foreign tools arrive already governed by the gates you built in Module 6 — and the honest danger model for other people's code: poisoned labels with instructions hiding in tool descriptions, rug pulls where a tool changes after you trusted it, servers that over-reach, and a crowd where anyone can publish and popularity is not an audit. The door policy distilled to five questions, and the member writes the socket brief — what they'd actually plug in, and the policy in their own words.

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