15:04
29d ago
→Anthropic engineer Margot Van Laar: prompt engineering is mostly debugging production prompts, evals are the only rigorous way
Anthropic applied AI engineer Margot Van Laar shared two real-world prompt engineering cases at Code with Claude. For maintaining a customer service bot, she used XML tags to clean up structure and removed legacy 'forbidden list' instructions that cause overfitting in newer models; tool calls should be precise, and human handoff must weigh cost against benefit. When building a retail scheduling agent from scratch, she split the task into three simpler prompts—generate, evaluate, fix—and chose the stronger reasoning model Opus. She stressed repeatedly: without evals, you're just guessing.
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