Tool
A function the harness lets the model invoke to observe or act on the environment.
Illustrative conversation
- Did the model itself query the database?
- It selected a database tool; the harness validated and executed the call, then returned the result.
Definition
A tool is a callable capability exposed to a model, usually with a name, description, and input schema. Tools let an agent retrieve information, perform computations, or take actions that the model cannot carry out by generating text alone. The caller owns the next decision; a tool owns an operation. Tools can themselves use models or delegate to agents, so “tool” does not imply deterministic behavior. Execution and access control still belong to the surrounding application.
Reviewed