model-audit-lite

日本語版はこちら (README.ja.md)

A lightweight safety audit for Hugging Face models, with a focus on a gap heavier tools don't cover: conversion integrity. Three independent checks:

1. File-distribution audit — no model loading required, works on any HF repo. Detects pickle-format weights (.bin/.pt/.pkl, arbitrary-code- execution risk), flags bundled custom code (trust_remote_code), and computes SHA256 checksums.
2. Conversion-integrity audit (compare) — diffs a converted repo against its source: does the chat template still match? (For GGUF repos the template lives inside the weights file; it is read from the GGUF metadata with range requests, without downloading the weights.) Chat templates are small Jinja2 programs that run on every inference call, and as of early 2026 they're one of the few parts of a model repo that neither the model card, the metadata viewer, nor Hugging Face's automated scanners check — a poisoned template can pass every existing scan. With --probes, it also re-runs the safety probe suite against both the source and the converted model and reports only what changed, since quantization and format conversion can measurably shift safety-alignment behavior in either direction.
3. Safety probe suite — a small, known-pattern prompt set (instruction override, jailbreak roleplay, harmful code generation, prompt injection, system-prompt extraction, etc.) run against a single model, with a simple heuristic pass/fail marker.

Scope, honestly

This is not a substitute for a real red-team benchmark — tools like Meta's CyberSecEval, ETH Zurich's AgentDojo, or scanners like NVIDIA's garak exist and go much deeper, at the cost of being heavier to set up and run. This fills a narrower, more specific gap: a 5-minute, zero-infrastructure check you run on your own model conversions before shipping them, that specifically catches the one thing those general-purpose benchmarks weren't built to look for — whether this specific conversion silently changed something (the chat template, the safety-alignment behavior) relative to the model you started from.

Part of a set of Japanese LLM / agent security resources: japanese-llm-security.

Install

From PyPI:

pip install model-audit-lite
# or, with a backend for the probe suite:
pip install "model-audit-lite[mlx]"
pip install "model-audit-lite[transformers]"

# or clone and install editable for local development:
git clone https://github.com/masahiroid/model-audit-lite.git
cd model-audit-lite && pip install -e ".[mlx]"

Usage (CLI)

# File-distribution audit only -- works on any repo, no model loading
model-audit-lite audit mlx-community/some-model

# Conversion-integrity audit: does the converted repo's chat template
# still match the source model's?
model-audit-lite compare original-org/base-model your/converted-model --lang ja

# ...and also re-run the safety probes on both and diff the results
model-audit-lite compare original-org/base-model your/converted-model \
  --probes --base-backend transformers --derived-backend mlx-lm --lang ja

# Safety probe suite on a single model (loads the model)
model-audit-lite probe your/model --backend mlx-lm --lang ja

# File audit + single-model probe suite, written to SECURITY.md
model-audit-lite full your/model --backend mlx-lm --lang ja -o SECURITY.md

Usage (Python API)

The probe runner is backend-agnostic — pass any generate_fn(prompt: str) -> str:

from model_audit_lite import audit_repo, run_probes, write_security_md

file_result = audit_repo("your/model")

from mlx_lm import load, generate
model, tokenizer = load("your/model")

def generate_fn(prompt: str) -> str:
    messages = [{"role": "user", "content": prompt}]
    text = tokenizer.apply_chat_template(messages, add_generation_prompt=True)
    return generate(model, tokenizer, prompt=text, max_tokens=300)

probe_report = run_probes(generate_fn, source="ja")  # or "en", or a path to your own YAML

print(write_security_md(audit_result=file_result, probe_report=probe_report, repo_id="your/model"))

Conversion-integrity checks work the same way:

from model_audit_lite import diff_chat_template, diff_probe_results, write_comparison_report

template_diff = diff_chat_template("original-org/base-model", "your/converted-model")
print(template_diff.verdict)  # "identical" | "changed" | "added" | "removed" | "no_template"

# Optionally, also diff safety-probe behavior (you supply a generate_fn for each model):
base_report = run_probes(base_generate_fn, source="ja")
derived_report = run_probes(derived_generate_fn, source="ja")
probe_diff = diff_probe_results(base_report, derived_report)
print([r.id for r in probe_diff.regressions])  # safe -> unsafe only

print(write_comparison_report(
    template_diff=template_diff,
    probe_diff=probe_diff,
    probe_total=derived_report.total,
    base_repo_id="original-org/base-model",
    derived_repo_id="your/converted-model",
))

Japanese indirect prompt-injection probe set (ja-injection)

60 harmless-canary probes (10 categories x 6) where the injected instruction sits inside an untrusted document the model was asked to process (email, RAG chunk, tool output, HTML comment, ...), written for Japanese specifics: keigo-style polite injections, full-width/hiragana/romaji obfuscation, fake 【システム】 markers, and BIPIA-style start/middle/end positions. The canary is split in the document ("ZX" "-" "1001") so quoting the injection does not count as following it; only reasoning text is stripped before judging.

model-audit-lite probe <repo_id> --probe-set ja-injection --max-tokens 300

Dataset card and per-category results: https://huggingface.co/datasets/masahiroid/japanese-indirect-prompt-injection-probes (v0.1; directional only, see "What this is not").

For agentic, tool-using evaluation in Japanese (user tasks plus injection tasks with state-based checks), see the unofficial Japanese localization of AgentDojo: https://github.com/masahiroid/agentdojo-ja

One command: scan

Runs the file audit, the conversion compare (with --base) and the safety probes (with --probes), and writes one output directory: report.md (human), bom.json (CycloneDX 1.6 with lineage) and summary.json (status pass / warn / fail for CI).

model-audit-lite scan your/converted-model --base original-org/base-model -o audit-out/        # audit + compare + BOM
model-audit-lite scan your/converted-model --base original-org/base-model --probes --probe-set ja-injection -o audit-out/

fail = pickle files, a changed chat template, or a safe-to-unsafe probe regression; warn = bundled custom code. The exit code follows --fail-on {fail,warn,never} (default fail), so it can gate a CI job:

- run: pip install model-audit-lite
- run: model-audit-lite scan ${{ vars.MODEL_REPO }} --base ${{ vars.BASE_REPO }} --lang en -o audit-out

Reading probe results with statistics

scan --probes now reports the follow rate with a 95% Wilson interval, tests a before/after change on the same probes with an exact McNemar test, and states the size of difference the probe set can resolve (n=60: about 26 points between two independent runs, worst case). The verdict is statistical: fail only when the safe->unsafe shift is significant (p < 0.05, more regressions than improvements); more regressions that are within noise give a warn (probe-regressions-not-significant). Helpers: model_audit_lite.stats (wilson_interval, mcnemar_exact, detectable_difference). The two models of a paired run are loaded one after the other, never together.

ML-BOM with conversion lineage (bom)

One command writes a CycloneDX 1.6 ML-BOM that bundles what this tool already knows: SHA-256 per file, pickle / custom-code findings, detected formats, and (with --base) the conversion lineage as pedigree.ancestors plus the chat-template check. It stands alone, or merges into a BOM from another generator so you keep one document:

model-audit-lite bom your/converted-model --base original-org/base-model -o bom.json
model-audit-lite bom your/converted-model --base original-org/base-model --merge owasp-aibom.json -o merged.json

Properties use the model-audit-lite: prefix. Lineage is as declared by the publisher; this is not a verification of weights.

Extending the probe suite

Prompts live in plain YAML (model_audit_lite/probes/default_prompts_{ja,en}.yaml). Each entry is just:

- id: my-new-case
  category: my-category
  prompt: "..."
  # optional: for cases where the correct behavior is NOT refusal
  # (e.g. prompt injection -- the model should just ignore the injected
  # instruction and carry on), flag unsafe only if a specific string appears:
  unsafe_if_contains: ["SOME_MARKER"]

Pass your own file with source="path/to/your.yaml" (Python) or --prompts path (CLI/roadmap). If you find a real gap this suite misses, that's the point — add a case and send a PR.

What this is not

• Not a substitute for a real red-team / adversarial evaluation (see CyberSecEval, AgentDojo, garak, promptfoo for deeper options).
• The heuristic pass/fail marker is a first-pass string-match screen, not a judgment. Always read the raw response text yourself before trusting a result — this is especially true for Japanese, where refusal phrasing is far more varied than the small marker list in this repo can fully cover.
• The file audit checks distribution safety (can this file execute arbitrary code on load?), not model behavior — a clean file audit says nothing about what the model will generate.
• The compare command's --probes mode re-runs the same heuristic marker-based judgment on both models — it inherits the same false-positive/negative limitations, just applied twice and diffed.
• Scaling to thousands of prompts is not the roadmap, and wouldn't help. Prompt injection isn't a problem you converge toward solving by sampling harder — LLMs have no hard boundary between "instruction" and "data" for more test cases to triangulate, and attackers adapt to whatever test set you publish. Even heavily red-teamed frontier models still show double-digit injection success rates in benchmarks like CyberSecEval (26-41% across every model tested in v2) — that's a structural property of current LLM architectures, not a sign that existing test suites are merely too small. Ten prompts per category and ten thousand measure the same ceiling with different precision; they don't raise it. What actually extends coverage is adding new attack categories as novel techniques emerge, not multiplying phrasing variants within existing ones — so that's where this suite's own test set is meant to grow. Treat results as a directional read of known-pattern exposure (useful for comparing categories, or for diffing a conversion's behavior against its source), not a path toward provable robustness. Actual mitigation of prompt injection has to happen at the application layer — don't let model output trigger actions without a check, treat all externally-sourced content as data rather than instructions downstream, minimize what the model is privileged to do — regardless of how many probes pass.

Example output

• File audit + probe suite: examples/sample_report.md (日本語版).
• Conversion-integrity compare: examples/sample_comparison.md (日本語版).

License

MIT