What Is an MCP Server? A Plain-English Guide
Updated November 5, 2026
Short answer: An MCP server is a small program that gives an AI assistant new abilities. It uses the Model Context Protocol (MCP), an open standard, to offer tools the assistant can call and data it can read. Connect one to Claude, ChatGPT, Cursor or VS Code and the assistant can use it during a conversation.
What does MCP stand for?
MCP stands for Model Context Protocol. Anthropic introduced it in November 2024 as an open standard for connecting AI applications to outside systems. The official documentation compares it to a USB-C port: one standard connection instead of a custom one for every pairing.
Without a standard, every AI app would need its own integration with every tool. With MCP, a server built once works in any app that supports the protocol.
How does an MCP server work?
There are two sides. The client is the AI app you use, such as Claude or Cursor. The server is the program that provides the abilities.
- You add the server to your AI app, using a URL or a start command.
- The app connects and asks the server what it can do. The server replies with a list of tools.
- When you ask for something, the assistant picks a suitable tool and calls it.
- The server does the work and returns the result, and the assistant uses it in its answer.
What can an MCP server provide?
- Tools: actions the assistant can take, such as searching the web or running a database query.
- Resources: data the assistant can read, such as files or records.
- Prompts: ready-made instructions for common jobs.
Tools are by far the most common. In our directory, 282 hosted servers currently share their tool list publicly.
What is an example of an MCP server?
A database server lets you ask "which customers signed up last week?" The assistant looks at your schema, writes the query, runs it through the server and answers in plain language. A browser server lets it open a page and click through it. A GitHub server lets it read issues and open pull requests.
How is an MCP server different from an API?
An API is built for developers, who read its documentation and write code against it. An MCP server is built for AI assistants: it describes its own tools so the assistant can work out how to use them without custom code. Many MCP servers are a thin layer on top of an existing API.
How do I start using one?
Pick a server for the job you have, then add it to your app. Our guides cover Claude, ChatGPT, Cursor and VS Code. For something you can try right away, see our free servers with no API key.
Frequently asked questions
Is MCP only for Claude?
No. MCP is an open standard. Claude, ChatGPT, VS Code, Cursor and many other apps support it.
Do I need to code to use an MCP server?
No. Hosted servers usually need only a URL pasted into your app. Local servers need a short config entry, which each server's instructions provide.
Are MCP servers free?
Many are, especially open source ones you run yourself. Hosted servers range from free to pay-per-call to subscription plans.