What is an MCP connector? A plain definition, with an example

In short

An MCP connector is the link that lets an AI assistant use a tool through the Model Context Protocol: you paste a URL and sign in. How it differs from a server.

By FezolaPublished November 15, 20262 min read

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An MCP connector is the link that lets an AI assistant such as Claude or ChatGPT use a tool or a data source, through the Model Context Protocol (MCP). As a user, you set it up by pasting a URL in the assistant's settings and signing in. Behind that URL sits an MCP server, the program that does the work. This guide defines the terms with one example.

Connector, server and API

Definitions as of 15 November 2026, following the [official MCP documentation](https://modelcontextprotocol.io/docs/getting-started/intro).
Term	What it is	Who deals with it	Example
MCP	The open standard (Model Context Protocol)	Developers	modelcontextprotocol.io
MCP server	The program exposing a tool's actions	The provider	A mailbox, calendar or notes server
MCP connector	The link from the assistant to a server	You, in settings	A URL plus a sign-in
API	One service's own interface	Developers	A mail provider's API

The words connector and server are often used loosely: in Claude's menus you add a custom connector, and what you paste is the address of a remote MCP server. See what is MCP for the protocol itself.

An example, step by step

Say you want your assistant to search several mailboxes. With a hosted connector such as Fezola, you connect each mailbox once, then add one URL in Claude, ChatGPT or Grok and sign in. The assistant can now search all of them, and each result names its account. Replies are saved as drafts, so you read and send yourself.

What changes with the plan

Adding a custom connector depends on your plan: Claude allows it from Free, with one connector, while ChatGPT lists Business, Enterprise and Edu, with Pro read-only. See which plan you need, then the guides for Claude connectors and ChatGPT connectors. If a connector runs on your own computer instead of a provider's servers, see remote or local MCP server.

Fezola is free for 2 sources; Pro is unlimited for $9 a month or $90 a year, with a 7-day free trial. Create your free Fezola account to try a connector.

Questions and answers

What is an MCP connector?

An MCP connector is the link that lets an AI assistant such as Claude or ChatGPT use a tool or data source through the Model Context Protocol. As a user you set it up by pasting a URL and signing in; behind it sits an MCP server.

What is the difference between an MCP connector and an MCP server?

The MCP server is the program that exposes a tool's capabilities. The connector is how the assistant is pointed at it, usually a URL you add in the assistant's settings. In everyday use the two words are often mixed.

What is the difference between an MCP connector and an API?

An API is how one program talks to one service, in that service's own way. MCP is a common way for assistants to talk to many services, so an assistant can use a new tool without a custom integration for each.

Do I need to code to use one?

No. For a hosted connector you add a URL in Claude or ChatGPT and sign in. Plans differ in what they allow: see our guide to which plan you need.

Is an MCP connector safe?

It depends on the server and the permissions you give it. Check what it can read, whether it can write or send, who runs it and how you remove access, and treat what it reads, such as an email, as untrusted input.