The original title is: "MCP Protocol Deep-Dive: How Tool Discovery Actually Works Under the Hood"

Short summary

A technical walkthrough of how MCP tool discovery works, starting with a JSON-RPC 2.0 handshake that negotiates protocol version, transport, and supported extensions between client and server. After handshake, clients issue tools/list calls with cursor-based pagination and dynamic filtering to handle large tool registries efficiently. The article covers capability negotiation, input schema validation, and practical code examples for each stage.

• •JSON-RPC 2.0 handshake negotiates protocol version and tool discovery capabilities
• •tools/list uses cursor-based pagination and dynamic filtering for large registries
• •Input schemas govern LLM tool-call construction and client-side argument validation

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