Glossary
A request from a model or agent to run an external function - a search, a database query, an API action - and return the result.
A tool call is how a model reaches beyond text generation to do something: invoking a defined function with arguments and receiving a result it can reason over.
Tool calls are the highest-leverage and highest-risk part of an agent, because they can read sensitive data or trigger real actions - so each one is a natural point to authorize, scope, and log.
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