What is an MCP server? A plain-English guide

When you chat with ChatGPT or Claude, the AI can only work with what is inside the conversation. It cannot open a file on your laptop or check your server. The Model Context Protocol, or MCP, changes that.

The short version

MCP is an open standard that lets an AI app connect to outside tools in a common way. A tool might read files, query a database, search the web or run a command. The program that offers those tools is called an MCP server. The AI app that uses them is the MCP client.

An everyday comparison

Think of USB. Before it, every device needed its own cable. With one standard plug, any device works with any computer. MCP does the same for AI: a tool built once works in ChatGPT, Claude, Cursor and other apps that support it.

Local and remote MCP servers

• Local servers run on your computer and are used by desktop apps on that same computer.
• Remote servers run on the internet and can be used by web and mobile apps, such as ChatGPT in your browser or on your phone.

Shellway is a remote MCP server with a twist: it relays each request to a small app on your own computer, so web and mobile AI apps can work with your real files and terminal.

Is it safe?

An MCP server can only do what its tools allow, and you decide which servers to connect. With Shellway you also choose the folders the AI may use, risky actions ask first, and every action is logged.

Try it

See the setup guides for ChatGPT, Claude and Cursor, or browse the prompt library for ideas.