MCP

MCP (Model Context Protocol) is an open protocol from Anthropic for connecting LLM applications to external tools and data. An MCP client (Cursor, Claude Desktop, any agent framework) talks to one or more MCP servers over stdio or SSE; each server exposes tools, resources, and prompts the model can invoke. The point of standardising this: instead of every agent re-implementing "browser access", "filesystem access", "database access" from scratch, you write one MCP server per capability and every MCP-aware client gets it for free. Hence the growing library of servers — Playwright MCP for browsers, GitHub MCP for repos, Postgres MCP for queries, filesystem MCP, Slack MCP, and so on. Conceptually it's a "USB-C for LLM tools": one plug shape, many capabilities.