What Are Tools?

A Tool is an action an AI client can perform through an MCP server — calling an API endpoint, running a database query, or executing a chain of steps. Tools are what turn a passive API into something an AI agent can actually act on, not just read.

Each tool declares a JSON Schema for its input and output, so the AI client knows exactly what to send and what it will get back. A tool's name and description are what the AI reads to decide when and how to call it.

Learn more: Dynamic Tools.