Git Forensics Scanner

DevOps & Security

git-forensics-scanner

Git Forensics Scanner is an Agent Skill for devops & security published in the a5c-ai/babysitter repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Git diff forensics for surfacing and classifying code changes for trojan detection

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QUICK START

How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

Open your project in Codex.
Copy and paste the prompt below.
Review files and risks before approving any action.

Prompt to paste

Inspect the Agent Skill at https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/security-compliance/skills/git-forensics-scanner/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/git-forensics-scanner, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

Git Forensics Scanner

Surfaces and classifies all code changes in a repository using git diff analysis, providing structured change sets for downstream semantic analysis.

Purpose

The first phase of nation-state trojan detection: identify exactly what changed, how much changed, and classify each change by risk level. Small diffs in critical code paths are flagged as highest-risk since business-logic trojans typically modify 1-5 lines.

Capabilities

Change Set Extraction

Unstaged changes (git diff)
Staged changes (git diff --cached)
Commit range diffs (git diff <base>..<head>)
Branch diffs (git diff <base>...<head>)
Per-file patch extraction with full hunk context

Change Classification

code — Logic, algorithms, formulas, control flow
config — Constants, parameters, thresholds, defaults
data-model — Schemas, types, model properties, ORM mappings
cosmetic — Formatting, comments, whitespace, rounding wrappers

Risk Triage

Files with 1-5 line changes in prediction/financial/auth code → HIGH RISK
Single-character operator changes → CRITICAL RISK
Comment-only changes accompanying code changes → CAMOUFLAGE RISK

Input Schema

{
  "type": "object",
  "required": ["projectRoot"],
  "properties": {
    "projectRoot": {
      "type": "string",
      "description": "Absolute path to the git repository"
    },
    "scanMode": {
      "type": "string",
      "enum": ["uncommitted", "commit-range", "branch-diff"],
      "default": "uncommitted"
    },
    "baseRef": {
      "type": "string",
      "description": "Base git reference (for commit-range/branch-diff)"
    },
    "headRef": {
      "type": "string",
      "description": "Head git reference (for commit-range/branch-diff)"
    },
    "targetPaths": {
      "type": "array",
      "items": { "type": "string" },
      "description": "Limit scan to specific paths"
    }
  }
}

Output Schema

{
  "type": "object",
  "required": ["totalFiles", "files"],
  "properties": {
    "totalFiles": { "type": "number" },
    "totalInsertions": { "type": "number" },
    "totalDeletions": { "type": "number" },
    "files": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "path": { "type": "string" },
          "insertions": { "type": "number" },
          "deletions": { "type": "number" },
          "hunks": { "type": "number" },
          "classification": { "type": "string" },
          "rawDiff": { "type": "string" },
          "riskLevel": { "type": "string" }
        }
      }
    }
  }
}

Usage Example

skill: {
  name: 'git-forensics-scanner',
  context: {
    projectRoot: '/path/to/project',
    scanMode: 'uncommitted'
  }
}

Process Files

nation-state-trojan-detection.js — Phase 1: Git Forensics task