How to Implement Tool Calling in an AI Agent With Python

A step-by-step guide walks through building a Python AI agent that uses OpenAI's Responses API for tool calling. It covers setting up the OpenAI SDK and Pydantic, defining Python functions and their schemas, connecting them to the model with pydantic_function_tool, detecting and executing function calls, building a turn-limited execution loop, adding error handling, and supporting multiple tools. A worked example builds a flight-status and weather-lookup agent, demonstrating multi-tool calls and error recovery within one conversation turn.

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