An MCP client is the AI-side host that discovers servers, lists their tools and routes the model's calls to them.
2 min readupdated 2026-08-01
/ quick answer
The client owns the connection lifecycle: it launches or dials servers, performs capability discovery, injects the tool schemas into the model's context, executes the calls the model requests, and returns results. Claude Desktop, Cursor, ChatGPT connectors and custom agents built with the AI SDK are all MCP clients.
An MCP client is the AI-side host that discovers servers, lists their tools and routes the model's calls to them. The client owns the connection lifecycle: it launches or dials servers, performs capability discovery, injects the tool schemas into the model's context, executes the calls the model requests, and returns results. Claude Desktop, Cursor, ChatGPT connectors and custom agents built with the AI SDK are all MCP clients. In practice: Cursor as an MCP client connects to a Postgres server and a docs server, then lets the coding model query the schema while writing a migration. This dictionary node is part of the Onexial knowledge graph and links to related concepts, workflows and tools below.
Definition
The client owns the connection lifecycle: it launches or dials servers, performs capability discovery, injects the tool schemas into the model's context, executes the calls the model requests, and returns results. Claude Desktop, Cursor, ChatGPT connectors and custom agents built with the AI SDK are all MCP clients.
Example
Cursor as an MCP client connects to a Postgres server and a docs server, then lets the coding model query the schema while writing a migration.
The client owns the connection lifecycle: it launches or dials servers, performs capability discovery, injects the tool schemas into the model's context, executes the calls the model requests, and returns results. Claude Desktop, Cursor, ChatGPT connectors and custom agents built with the AI SDK are all MCP clients.
What is an example of MCP Client?
Cursor as an MCP client connects to a Postgres server and a docs server, then lets the coding model query the schema while writing a migration.
Why does MCP Client matter for AI and automation?
An MCP client is the AI-side host that discovers servers, lists their tools and routes the model's calls to them. It connects to the workflows, prompts and tool stacks linked on this page, so you can move from definition to execution without leaving Onexial.