MCP Crash Course : FAFO

graph TD A["JSON-RPC 2.0<br/>Stateless RPC Protocol"] --> B["Request Object"] A --> C["Response Object"] A --> D["Batch Operations"] B --> B1["Required Fields<br/>jsonrpc: '2.0'<br/>method: String"] B --> B2["Optional Fields<br/>params: Structured<br/>id: String/Number/Null"] B1 --> B3["Parameters<br/>by-position Array or<br/>by-name Object"] B2 --> B4{"Has ID?"} B4 -->|No ID| B5["Notification<br/>No Response Expected"] B4 -->|Has ID| B6["Regular Request<br/>Response Expected"] C --> C1["Success Response"] C --> C2["Error Response"] C1 --> C1A["jsonrpc: '2.0'<br/>result: value<br/>id: same as request"] C2 --> C2A["jsonrpc: '2.0'<br/>error: ErrorObject<br/>id: same or null"] C2A --> C2B["Error Object Fields"] C2B --> C2C["code: Integer<br/>message: String<br/>data: Optional"] C2C --> C2D["Predefined Errors"] C2D --> E1["-32700: Parse Error"] C2D --> E2["-32600: Invalid Request"] C2D --> E3["-32601: Method Not Found"] C2D --> E4["-32602: Invalid Params"] C2D --> E5["-32603: Internal Error"] C2D --> E6["-32000 to -32099: Server Error"] D --> D1["Array of Requests"] D1 --> D2["Sequential Processing<br/>or Parallel"] D2 --> D3["Response Array"] D3 --> D4["One Response per<br/>non-Notification Request<br/>in Order"] style A fill:#4A90E2,color:#fff,stroke:#2E5C8A,stroke-width:3px style B fill:#7B68EE,color:#fff style C fill:#50C878,color:#fff style D fill:#FF6B6B,color:#fff style B5 fill:#FFD700,color:#000 style B6 fill:#87CEEB,color:#000 style C1 fill:#98FB98,color:#000 style C2 fill:#FFB6C1,color:#000