What Is an MCP Server? Anthropic's Open Standard Explained for AI Builders
Model Context Protocol (MCP) is an open standard introduced by Anthropic in late 2024 that allows AI models to connect with external tools and data sources in a standardized way. An MCP server is a lightweight program that exposes capabilities — such as querying databases or calling APIs — to any AI client that supports the protocol. Before MCP, developers had to write separate custom integrations for each AI client, meaning one capability could require six different implementations across six tools. MCP replaces this fragmented approach with a single protocol, so one server can serve all compatible clients including Claude, Cursor, VS Code, and custom agents. The standard supports tool discovery, tool invocation, resource exposure, and model sampling, making it particularly useful for teams building shared AI tooling at scale.
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