Individual skill
mandela
Audit any eval, metric, experiment, or benchmark for leakage — does external ground-truth enter independently, or are the model, scorer, and designer just confirming a result no outside truth ever produced? Use before trusting any 'how we'll know it worked' — an A/B, a holdout, a score, a validation — and whenever a result feels too clean or self-confirming. Walks an 8-pattern leakage taxonomy and returns only the patterns that fire, each with an independence fix. Read-only.
skills/depth/mandela/SKILL.md
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Audit a validation for leakage: does outside ground-truth actually enter, or is everyone confirming a result no one independently produced?
## Goal
The name is the **Mandela Effect** — a whole population *confidently remembers* something that never independently happened; a leaky validation is the same shape. Walk the 8 patterns below. `mandela` checks one thing: whether a *validation* is independent, or whether the designer, model, and scorer are only confirming each other.
## Workflow
1. Identify the validation (eval / metric / experiment / holdout / "how we'll know"). Name its **components** — what plays model, scorer, designer, dataset.
2. Ask the **core question**: does external ground-truth enter *independently*?
3. Test the validation against all **8 patterns** below (some apply only to certain components — a human subject, a scorer); report only the ones that fire, each by name.
4. Give the independent-ground-truth fix for each hit.
## The 8 leakage patterns