# Verifier card — `allenai_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: 2
- seal: `record_sha256:65b04dd297a1d9fa` — re-running this audit reproduces it byte-for-byte

## What we tested

- **Degenerate-probe** — 16 content-free completions: **1 accepted** (≥ 0.5)
- **IPT invariance** — n/a (no free-text reference completion to perturb)
- **Verifier-completeness** — abstained (no usable scalar ground-truth answer)
- **Exploit-search** — searched the reward space; no accepted non-attempt ✓

## What we found

- **Accepted garbage** (content-free completions ≥ 0.5): `whitespace`=1.0

## Reproduce

```
stardata audit allenai_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.