WHAT TOOLS ARE

CHECK YOUR UNDERSTANDING • Who actually runs a tool, the model or the harness? ◦ Answer: the harness runs it; the model only writes the request. • What does an input schema do? ◦ Answer: it describes the fields, types, and rules a tool needs, so requests can be validated. • Why can swapping a weather provider be invisible to the agent? ◦ Answer: because the output schema stays the same, with an adapter converting each provider's data. • Give one read-only tool and one action tool. ◦ Answer: search_database is read-only, and delete_record is an action tool. • Name two safety measures for action tools. ◦ Answer: any two of human approval, rate limit, audit log, permission check, idempotency check.