MCP server
A program that exposes tools, data, or actions to AI agents over the Model Context Protocol.
An MCP server is the thing on the other end of the Model Context Protocol — it advertises a set of tools (functions the agent can call), resources (data the agent can read), and prompts, and responds to an agent's requests over JSON-RPC. A GitHub MCP server lets an agent open issues and read repos; a Postgres MCP server lets it query a database; Stork's MCP server lets it search a catalog of AI tools.
For a maker, shipping an MCP server (or getting listed in a catalog of them) is increasingly how your product reaches agent-driven workflows. The agent doesn't browse a website — it calls a tool. If you're not callable, you're not in the consideration set.