MCP (Model Context Protocol)

An open protocol for plugging tools and data into AI apps: write a server once, use it from any client.

An MCP server exposes tools, resources and prompts over a standard protocol. Clients such as Claude, ChatGPT, IDEs and coding agents connect to it and offer those tools to the model. For a product, an MCP server is the way to become usable by agents without each vendor building its own integration.

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Related terms

Tool use (function calling): The model returns a structured request to run a function you defined; your code runs it.
AI agent: A model that decides its next step itself, calls tools and repeats until the task is done.
Prompt injection: Instructions hidden in data (a web page, an email, a file) that the model follows as if they came from you.

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Przemysław Zalewski · 15+ years shipping software

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MCP (Model Context Protocol)

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