---title: Integrationsdescription: "An integration is something Executor connects to, defined by an MCP server, an OpenAPI spec, or a GraphQL endpoint."--- An **integration** is something Executor can connect to. Each integration is defined bya spec that describes the available tools: - an **MCP server**- an **OpenAPI** specification- a **GraphQL** endpoint The integration describes the catalog of tools; on its own it isn't a live, authenticatedconnection. To actually call tools, you create a [connection](/concepts/connections). <Card title="Add your first integration →" href="/local/cli" horizontal>  See the CLI page for adding an integration from the web UI or the CLI.</Card>