# Verifier card — `ifeval` · grade **C**

> One reward-hack signature — the reward is partly gameable (see findings).

- source: `prime-hub` · verifiers: `0.1.14` · pass_threshold: `0.5` · rows: 3
- seal: `record_sha256:27df91ae46ec0672` — re-running this audit reproduces it byte-for-byte

## What we tested

- **Degenerate-probe** — 24 content-free completions: **3 accepted** (≥ 0.5)
- **IPT invariance** — n/a (no free-text reference completion to perturb)
- **Verifier-completeness** — abstained (no usable scalar ground-truth answer)

## What we found

- **Accepted garbage** (content-free completions ≥ 0.5): `echo_prompt`=1.0, `idk`=1.0

## Reproduce

```
stardata audit ifeval --row-seed 0
```

## Remediation

- Reward credits content-free completions — gate on substantive content (length, distinct tokens, structure) before scoring, or the threshold is too low.