# L1 Adaptive Abuse Detection — Coverage Audit

Coverage key: `L1_adaptive_abuse_detection.md`
Designs: X = `d10.md`, Y = `d21.md`
HARD components: #4, #6, #7, #10

## Design X (d10)

| # | Component | Verdict | Note |
|---|-----------|---------|------|
| 1 | Hidden-attribute hypothesis | COVERED | Names fake reviews, payment fraud, coordinated rings. |
| 2 | Signal / evidence channel | COVERED | Stable public + rotating private signal layers. |
| 3 | Threshold and routing rule | COVERED | Staged: rate-limits/holds/verification vs immediate restrict by confidence. |
| 4 [HARD] | Error-cost profile (FP vs FN), explicit | COVERED | Twin gauges pull opposite ways; FP/FN named co-equal, warns against optimizing one metric. |
| 5 | Base-rate / validation check | COVERED | Private holdout of fresh fraud cases tracks live-signal decay. |
| 6 [HARD] | Adaptation & recalibration loop | COVERED | Core: moving-target signals, rotation, trigger-forced refresh. |
| 7 [HARD] | Anti-gaming / signal-secrecy | COVERED | Explicit public/private-rotating split; boundary vs reasons designed deliberately. |
| 8 | Notice and reason-giving | COVERED | Prompt notice + category/contestable-facts reason, weights withheld. |
| 9 | Review / appeal path with remedy | COVERED | Genuine hearing, reviewer not identical to model, reinstatement. |
| 10 [HARD] | Impartiality / independent review | COVERED | Review before/quickly after action, independent of flagging path, anti-theater. |
| 11 | Consistency standard | MISSING | Like-cases-alike not addressed. |
| 12 | Proportional / reversible consequence | COVERED | Confidence-scaled, reversible soft responses for ambiguous flags. |
| 13 | Monitoring of both error directions | COVERED | Holdout-evasion (FN) + appeal-overturn (FP) gauges. |
| 14 | Privacy / data-minimization boundary | MISSING | Data-collection bound / surveillance limit not addressed. |

Total: 12/14 COVERED. HARD: 4/4 COVERED.

## Design Y (d21)

| # | Component | Verdict | Note |
|---|-----------|---------|------|
| 1 | Hidden-attribute hypothesis | COVERED | Distinct abuse classes mapped to signal families. |
| 2 | Signal / evidence channel | COVERED | Detailed portfolio: payment, history, content, network, behavioral. |
| 3 | Threshold and routing rule | COVERED | Modular per-signal thresholds; flag>60 -> review vs restrict. |
| 4 [HARD] | Error-cost profile (FP vs FN), explicit | MISSING | Names twin failure modes but states no accountable posture / co-equal calibration; FP handled only as downstream feedback. |
| 5 | Base-rate / validation check | COVERED | Out-of-sample held-out validation; FP trends across seller categories. |
| 6 [HARD] | Adaptation & recalibration loop | COVERED | Rolling re-validation, rotation, shadow-mode candidates, retrain. |
| 7 [HARD] | Anti-gaming / signal-secrecy | COVERED | Record withholds thresholds/weights to deny evasion recipe; signal diversity. |
| 8 | Notice and reason-giving | COVERED | Transparency record states which signals fired and why. |
| 9 | Review / appeal path with remedy | COVERED | Human appeal, signal-correctness check, reversal + reinstatement. |
| 10 [HARD] | Impartiality / independent review | COVERED | Human review on appeal, distinct from automated score, before permanence. |
| 11 | Consistency standard | MISSING | Like-cases-alike not addressed. |
| 12 | Proportional / reversible consequence | MISSING | Mostly flag -> restrict-pending-review; no confidence-scaled reversible tiers. |
| 13 | Monitoring of both error directions | COVERED | Hit-rate-on-recent (FN) + appeal-success rate/FP trends (FP). |
| 14 | Privacy / data-minimization boundary | MISSING | Data-minimization / surveillance limit not addressed. |

Total: 10/14 COVERED. HARD: 3/4 COVERED (MISSING: #4 error-cost profile).
