ad-test-designer

1# Ad Test Designer
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3Designs paid-ad creative/landing A/B/n and incrementality tests and reads them out: hypothesis, variant matrix, sample-size/duration/power plan, effect size, uncertainty, practical-effect status, and guardrail state. This skill owns **experiment design + statistical interpretation**. It may apply an owner-approved, precommitted action rule, but it never treats a p-value or helper output as an automatic business decision. It does not produce variants (`ad-creative-builder`), read back one already-shipped change (`paid-measurement-loop`), or do cross-channel reporting (`performance-analyzer`).
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5## Quick Start
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7```text
8Design an A/B test for two landing-page hero variants. Baseline CVR is 3%, I want to detect a 15% lift. Goal is DR.
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10```text
11I have 4 RSA creative variants to test on a prospecting set. Build the variant matrix, sample size, and run duration.
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13```text
14Here's my finished test results CSV (variant, sessions, conversions). Is the winner significant — promote or kill?
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17## Skill Contract
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19- **Expected output**: a test design (hypothesis, variant matrix, immutable test/variant/measurement binding, primary/secondary/guardrail metrics, sample-size + duration + power plan) **and/or** a read-out bound to that exact design (effect estimate, interval, statistical flag, practical-effect flag, guardrails, and either an owner-governed recommendation or `decision: UNDECIDED`).
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