Model Context Protocol (MCP) Message Format Explained
This story is from 2026-09-24. It is preserved in the archive; the latest stories are on the live feed.
Short answer: The Model Context Protocol message format is JSON-RPC 2.0 — one request object with jsonrpc , method , params , and an id , one result or error object back, and notifications that carry no id at all. Over HTTP the whole conversation is POSTed to a single endpoint: initialize , then to…
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- 2026-09-24 11:01 · DEV Community — AI
Model Context Protocol (MCP) Message Format Explained