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promptfoo-evaluation

Configures and runs LLM evaluation using Promptfoo framework. Use when setting up prompt testing, creating evaluation configs (promptfooconfig.yaml), writing Python custom assertions, implementing llm-rubric for LLM-as-judge, or managing few-shot examples in prompts. Triggers on keywords like "promptfoo", "eval", "LLM evaluation", "prompt testing", or "model comparison".

promptfoo-evaluation/SKILL.md

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Nov 6, 2026
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# Promptfoo Evaluation

## Overview

This skill provides guidance for configuring and running LLM evaluations using [Promptfoo](https://www.promptfoo.dev/), an open-source CLI tool for testing and comparing LLM outputs.

## Quick Start

```bash
# Initialize a new evaluation project
npx promptfoo@latest init

# Run evaluation
npx promptfoo@latest eval