Developer breaks down MCP protocol underlying messages via interactive web page
11/13/2026 — 11/13, 09:13·1 sources (all)·1 reports (all)
Key takeaways
- A developer broke down the underlying MCP protocol requests and responses—including client initialization, capability confirmation, and tool…
Background & analysis
On November 13, 2026 at 08:42, a developer posting on Juejin shared a breakdown of the low-level communication messages behind the MCP protocol. According to the post, when an AI system says something like "let me read that file for you," the statement is not just a single piece of natural language. Behind it sits a sequence in which the client first asks the server what it supports, then lists the available tools, and only afterward sends a call request.
The author describes this chain as consisting of 3 round trips, 6 request and response messages, plus 1 initialization notification. To make the flow easier to grasp, the developer turned the whole chain into an interactive webpage where readers can click through each step and see how the MCP protocol exchanges messages between the client and the server at the transport level.
As of the available report, the work is presented and explained only through this interactive page, with no further tooling, specifications, or follow-up releases described in the material.
AI-generated from 1 reports · updated 12 hours ago
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Reports on this story headlines open the original
According to a developer post on juejin.cn, the natural language behind the MCP protocol actually involves 3 round-trips, 6 request/response messages, and 1 initialization notification where the client queries supported servers, lists tools, and executes calls, which the author visualized into an interactive webpage.
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