Individual skill

harness-similarity

Weighted similarity (ADR-152) between two harness fingerprints (genome + score JSON): an overall score in [0,1] plus per-component breakdown. Use when comparing two harnesses or detecting drift between them. Pure TypeScript; needs no @metaharness package.

plugins/ruflo-metaharness/skills/harness-similarity/SKILL.md

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Surfaces the production similarity function from [`scripts/_similarity.mjs`](../../scripts/_similarity.mjs) as a callable skill. Use when an agent needs to:

- decide whether to fork an existing harness vs scaffold a new one
- rank candidate templates against a target repo's genome
- diff two harnesses produced by different teams to find duplicate work
- generate the confidence number that ADR-151 §3.2's Recommender wraps

## Algorithm (from ADR-152 §Decision)

```
overall = 0.60·cosine + 0.25·categorical + 0.15·jaccard
```

- **cosine** — over a 9-dim numerical vector of normalized scorecard + genome dims
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