mcp-developmentlisted

# MCP Development Skill > **Domain**: AI Infrastructure > **Inheritance**: inheritable > **Version**: 1.2.0 > **Last Updated**: 2026-03-10 > ⚠️ **Staleness Watch** (`EXTERNAL-API-REGISTRY.md`): MCP spec and SDK are actively versioned. **SDK moved from 1.0.0 → 1.27.1** with 3 security fixes: cross-client data leak in shared instances (GHSA-345p-7cg4-v4c7), ReDoS (v1.25.2), command injection prevention (v1.27.1). New SDK features: task types, elicitation streaming, OAuth discovery/caching, fetch transport, conformance testing, framework-agnostic server refactoring. Streamable HTTP replaced HTTP+SSE for remote servers (spec 2025-03-26). Check [MCP Changelog](https://modelcontextprotocol.io/changelog) and [SDK Releases](https://github.com/modelcontextprotocol/typescript-sdk/releases) when advising on transport or SDK usage. --- ## Overview Complete guide to the Model Context Protocol (MCP)—an open standard for connecting AI assistants to external data sources and tools. Covers architecture, server development, client integration, and production deployment patterns. --- ## What Is MCP? ### The Problem MCP Solves ```text Before MCP: ┌─────────┐ ┌─────────┐ ┌─────────┐ │ Claude │ │ ChatGPT │ │ Copilot │ └────┬────┘ └────┬────┘ └────┬────┘ │ │ │ ▼ ▼ ▼ ┌─────────┐ ┌─────────┐ ┌─────────┐ │Custom │ │Custom │ │Custom │ │Plugin A │ │Plugin A'│ │Plugin A"│ └──