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Definition
JSON-RPC 2.0 is a stateless remote-procedure-call convention. A request names a method, passes params, and carries an id; the response returns a result or a structured error (with codes like -32602 for invalid params).
In plain terms
A simple, standard way to call a function on a server by sending it JSON.
Why it matters here
It is how you talk to the MCP server at /public/v1/mcp. See calling the MCP server.
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