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The Communication Protocol

huggingface.co · 934 words · saved by 1 readers

MCP defines a standardized communication protocol that enables Clients and Servers to exchange messages in a consistent, predictable way. This standardization is critical for interoperability across the community. In this section, we’ll explore the protocol structure and transport mechanisms used in MCP. We’re getting down to the nitty-gritty details of the MCP protocol. You won’t need to know all of this to build with MCP, but it’s good to know that it exists and how it works. At its core, MCP uses JSON-RPC 2.0 as the message format for all communication between Clients and Servers. JSON-RPC is a lightweight remote procedure call protocol encoded in JSON, which makes it: The protocol defines three types of messages: Sent from Client to Server to initiate an operation. A Request message includes: Example Request: Sent from Server to Client in reply to a Request. A Response message includes: Example Success Response: Example Error Response: One-way messages that don’t require a response

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