Prompt evaluation

Overview

• Prompt engineering: techniques for writing/editing prompts to help Claude understand requests and respond as desired
• Prompt evaluation: automated testing of prompts to get objective metrics on effectiveness

Focus

• This section emphasizes prompt evaluation first, then prompt engineering techniques

Three Paths After Writing a Prompt

• Option 1 (trap): Test once or twice, decide it's good enough for production
• Option 2 (trap): Test with custom inputs, tweak for a few edge cases
• Option 3 (recommended): Run prompt through evaluation pipeline for objective performance score

Key Takeaway

• Options 1 and 2 are common pitfalls that engineers fall into
• Insufficient testing leads to prompts that don't work as expected
• Best practice: use evaluation pipeline to measure performance, then iterate to optimize the prompt

Takeaways

• Prompt engineering involves writing/editing prompts to help Claude understand requests; prompt evaluation uses automated testing for objective effectiveness metrics
• Testing a prompt once or twice, or tweaking for a few edge cases, are common pitfalls that lead to poor production performance
• Best practice is to run prompts through an evaluation pipeline to measure performance objectively, then iterate to optimize