I Built a Tool-Calling Agent in Python. Here’s How I Debugged It

Building a tool-calling agent is easy until something breaks — and the final answer alone won't tell you why. This tutorial walks through constructing a fully inspectable Python agent loop using OpenAI's API, real public APIs, JSON Schema validation, and optional Weights & Biases Weave tracing, so you can verify exactly what the model requested, what executed, and what failed.