Causal Evidence Checklist

Bradford Hill's 9 viewpoints (1965) reframed as a checklist for product analytics. Use this skill before recommending a decision based on observational analytics data. Applies the 9 Bradford Hill viewpoints to score whether X actually caused Y, or whether the correlation is coincidental, confounded, or reversed. Use whenever interpreting a metric change the user is about to act on (rollback, ship, abandon, double-down). Refuses to label a verdict "high confidence" when fewer than ~5 of the 9 criteria pass. Pairs with analytics-diagnostic-method (which provides the hypothesis tree) and channel-and-funnel-quality (which provides the segmentation discipline). Triggers when Clamp MCP returns a comparison the user is about to act on, when a deploy correlates with a metric move, or when the user says "X caused Y" / "did X cause Y" / "should we roll back / ship / kill X" based on a chart. Vendor-neutral methodology; via Clamp MCP the per-criterion checks map directly to traffic.compare, traffic.breakdown, errors.timeline, and funnels.list.