Experiment design skill. Hypothesis-driven A/B test planning with sample size calculation, MDE definition, guardrail metrics, and runtime estimation. Use when DESIGNING A/B tests, calculating sample sizes, defining hypotheses, setting guardrail metrics, or planning experiment rollout.
Hypothesis-driven A/B test design with statistical rigor.
report.mdresults/experiment-plan.md: full plan using template.results/sample-size-calc.md: calculation with all inputs.If any gate fails: identify the issue, fix, and re-validate.