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evaluate-necessity-sufficiency
Test whether a proposed cause/mechanism is necessary and/or sufficient under controlled counterfactual or intervention comparisons.
skills/evaluate-necessity-sufficiency/SKILL.md
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# evaluate-necessity-sufficiency
## Purpose
Test whether a proposed cause or mechanism is necessary and/or sufficient under controlled counterfactual or intervention comparisons.
## Input contract
```yaml
required: [cause_or_mechanism, outcome, comparison_conditions]
optional: [counterfactual_worlds, intervention_data]
constraints: [necessary and sufficient tests must be reported separately]
```
## Procedure
1. Define removal/absence and presence/intervention contrasts.
2. Compare outcomes under held-fixed conditions.
3. Report necessity, sufficiency, confounds, and uncertainty.
## Output contract