---
license: other
license_name: all-rights-reserved
license_link: LICENSE
pretty_name: GrantBench
language:
- en
- ja
tags:
- security
- ai-agents
- mcp
- github-actions
- kubernetes
- terraform
- benchmark
configs:
- config_name: default
  data_files:
  - split: dev
    path: data/dev.jsonl
  - split: dev_ext
    path: data/dev_ext.jsonl
---

# GrantBench (development splits)

GrantBench is the benchmark used to evaluate **GrantLock**, a lockfile for *who an AI agent stack runs as*
(API keys, OAuth grants, service accounts, MCP server secrets, CI tokens, cloud roles and their scopes)
with a CI gate on semantic changes to those grants. Each case is a small repository snapshot.

- `planted`: a risk of one class G1–G8 planted into a least-privilege repository (snapshots `repo/`, and
  for `dev-ext` also `base/` = the reviewed state before the change)
- `clean`: a least-privilege, fully declared repository (for false-positive measurement)
- `diff_pair`: `before/` and `after/` snapshots with the expected set of classes

Classes: G1 inline secret value · G2 scope added to an existing identity · G3 wildcard / admin grant ·
G4 identity without an owner · G5 identity shared by several components · G6 long-lived static key where
federation is available · G7 new undeclared identity · G8 dormant grant.

## Splits

| Split | Cases | Surfaces | corpus_sha256 |
|---|---|---|---|
| `dev` | 120 (planted 80, clean 24, diff_pair 16) | MCP configs, GitHub Actions, `.env` | `806d821b43fe1813f21d0c7dded45e2b5871b50426a012fd791dbf5627aeae76` |
| `dev_ext` | 68 (planted 48, clean 12, diff_pair 8) | docker-compose, Kubernetes, Terraform | `0f5582ee1642557f779b93444f6c5653f15cb92359aa6bcfc1d37352c0244a8d` |

Each row holds the case metadata (`case_id`, `kind`, `lang`, `planted`, `expected_labels`, `description`)
and `snapshots`: for every snapshot directory (in `dev`, `repo/` and `after/` include the committed `grantlock.json` generated from the reviewed state), the list of files with path, size, SHA-256 and content.
All secret-like strings are invalid dummies that contain the marker `FAKE`. `dev` dummies imitate only
the prefix of real formats; `dev_ext` dummies follow the real formats (prefix, length, alphabet).

**Sealed holdout corpora are not part of this dataset** (neither holdout v1 nor v2).

## Results (GrantLock and baselines)

| Corpus | GrantLock G1–G8 recall | Clean false positives | Diff accuracy | gitleaks G1 | trufflehog G1 | Baselines G2–G8 |
|---|---|---|---|---|---|---|
| `dev` (frozen) | 10/10 for every class | 0/24 | 16/16 | 6/10 | 7/10 | 0/10 per class |
| `dev_ext` | 6/6 for every class | 0/12 | 8/8 | 5/6 | 6/6 | 0 |

The development splits were generated by the same author who wrote the detector; treat these numbers as
consistency checks, not as evidence of performance on configurations written by someone else.

### Gate history (sealed holdouts by independent authors, not included here)

Pre-registered bar (GATE 2): recall on G2, G3, G7 each ≥ 80% and mean ≥ 90%; clean false positives ≤ 5%.

| Step | Result | Outcome |
|---|---|---|
| Holdout v1 | G2 6/7, G3 5/7, G7 8/8 (mean 85.7%); clean false positives 0/16 | Fail (recall) |
| Fix round 1 | Four blind spots fixed | — |
| Holdout v2 | G2 7/8, G3 7/8, G7 8/8 (mean 91.7%); G1 6/8 (one detector exception); clean false positives 5/16; baselines G1 5/8 each, G2–G8 0 | Fail (false positives) |
| Fix round 2 | The compose rule behind all five false positives narrowed; format-table / schema mismatch fixed | — |
| Re-verification on disclosed v2 (not a gate) | Clean false positives 0/16, G1 7/8, diff 8/8; G2, G3, G7 unchanged | not a pass |

**The pre-registered GATE 2 has not been passed.**

## License

Copyright © 2026 NagaYu. All Rights Reserved. Published for evaluation only; no license to use, copy,
modify or distribute is granted (see `LICENSE`). Licensing or transfer inquiries:
https://nagayu-portfolio.nagayu.workers.dev/en