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Dev.to
7/24/2026
The original title is "MCP Protocol Deep-Dive: How Tool Discovery Actually Works"

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

Original: MCP Protocol Deep-Dive: How Tool Discovery Actually Works

Short summary

A technical deep dive into the Model Context Protocol (MCP), the open standard for connecting AI models to external tools and data sources. The article dissects the JSON-RPC 2.0 handshake that enables dynamic tool discovery, explaining the initialize request and tools/list call that lets clients learn server capabilities. It includes a functional MCP server implementation in about 50 lines of Go using the official SDK.

  • •MCP uses JSON-RPC 2.0 handshake for dynamic tool discovery between AI clients and servers
  • •The tools/list request returns structured JSON Schema describing each tool's inputs and outputs
  • •Includes a working 50-line Go MCP server using the official SDK

Generated with AI, which can make mistakes.

#ai-tools#ai-agents#open-source
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