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Model Context Protocol (MCP)
USB-C for the tool ecosystem — open standard letting any client connect any server.
4 hours2 resources1 prereqs
Anthropic's open standard. Each data source (Slack, GitHub, Postgres, filesystem) is wrapped as an MCP server; clients like Claude Desktop / Claude Code / Cursor connect to those servers.
Not a replacement for function calling — a portable + reusable version of it.