Cross-Harness Tool Parity: Write One Custom MCP Tool, Deploy It Everywhere

Short summary

Explains how the Model Context Protocol (MCP) enables a single custom tool definition to work across six AI coding environments—Claude Code, Cursor, Codex, Gemini CLI, Copilot, and Windsurf—without per-editor adapters. Walks through building a TypeScript MCP server with a weather-alert tool and a shared mcp.json configuration file. Eliminates redundant integration scripts and standardizes tool discovery, authentication, and invocation across the AI dev ecosystem.

• •MCP acts as a universal tool contract: define once, use across all major AI coding harnesses
• •Practical walkthrough builds a weather-alert MCP server in TypeScript with Zod schema validation
• •Single mcp.json file replaces six separate editor-specific integration configurations

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