Evals: proving it works
The idea: Build an eval set: inputs paired with expected answers or rubric criteria. Score every change against it — unit tests for prompts — so you ship improvements, not regressions.
What you'll be able to do: You can explain eval-driven development: test sets, scoring, and catching regressions.
The problem it solves: You tweak the prompt and it 'feels' better. Is it — or did you just break three other cases?
Builds on: Observability: seeing inside
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