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Tool Use Fundamentals

The tool ecosystem built on function calling — search, calculator, code-interpreter.

4 hours1 resources2 prereqs

Golden rules for tool design:

  1. Single responsibility — one tool, one job
  2. Clear description — the model decides when to call based on it
  3. JSON-schema parameters — types, descriptions, enums
  4. Educative error messages — so the model can self-correct on retry

Prerequisites

ReAct (Reasoning + Acting)
Thought → Action → Observation loop. Foundation of tool use and agents.
→
Function / Tool Calling
Give the model function signatures; it picks which to call with what args.
→

Resources(1)

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