Promptfoo: The Missing Testing Layer for Your AI Applications

Promptfoo: The Missing Testing Layer for Your AI Applications Why This Matters If you're building applications with LLMs, you've likely experienced this: you craft what seems like a perfect prompt, test it with a few examples, deploy it... and then users find all the edge cases where it fails spectacularly. Or worse—security researchers discover your AI assistant will happily reveal sensitive information when asked the "right" way. Promptfoo solves this. With 13,200+ GitHub stars and 1,700+ stars gained in just one week, it's become the de facto standard for prompt testing, red teaming, and vulnerability scanning for AI applications. It works across GPT, Claude, Gemini, and Llama, uses simple declarative configurations, and integrates directly into your CI/CD pipeline. This isn't just another developer tool—it's the missing testing layer that production AI applications desperately need. What Promptfoo Actually Does Promptfoo addresses several critical problems: Prompt Regression Testin