Evaluating OpenAI Agents

[jannikmaierhoefer]

Summary

This PR adds a guide on evaluating OpenAI agents using Langfuse.

Motivation

This cookbook guides users through the typical evaluation process involved in developing AI agents using the open-source tool Langfuse.

It shows how to perform offline evaluation by looping over a dataset and iterating agent metrics (e.g. model, search tool, etc.) It also explains how to do online evaluation, i.e., assessing metrics like costs and latency in a live production environment.

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