A hands-on guide to building custom tools for AI agents using CrewAI. The tutorial walks through creating a real-time currency conversion tool by implementing a Pydantic input schema class and a BaseTool subclass with a _run method that fetches live exchange rates via an external API. The guide also briefly introduces Opik, an open-source agent observability platform, and references a broader multi-part AI agents crash course covering topics like memory, ReAct, planning, and multi-agent patterns.
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