Dependency Check

Scans Python (requirements.txt) and npm (package.json) manifests for known-vulnerable versions and supply-chain risks. Offline by default — it ships a bundled advisory database so it runs in air-gapped CI — with an optional live OSV.dev lookup. Pure standard library.

When to use this skill

• "Are any of my dependencies vulnerable?"
• "Audit requirements.txt / package.json."
• "Check for vulnerable / outdated packages before release."

What it reports

• Known vulnerabilities — version matches against the bundled advisory DB (or OSV.dev with --online), with CVE/ID, severity and summary.
• Unpinned dependencies — ranges (^, ~, >=) or missing pins that make builds non-reproducible and widen supply-chain exposure.

How to run it

# Offline scan (bundled advisory DB)
python skills/dependency-check/checker.py requirements.txt
python skills/dependency-check/checker.py package.json

# Scan a directory (auto-discovers both manifest types)
python skills/dependency-check/checker.py .

# Live advisory lookup via OSV.dev
python skills/dependency-check/checker.py requirements.txt --online

# JSON output
python skills/dependency-check/checker.py . --json

# Only report MEDIUM or higher findings (unpinned warnings are LOW)
python skills/dependency-check/checker.py . --min-severity medium

Exit codes: 0 clean · 1 findings reported · 2 no manifest / usage error. Unpinned dependencies are reported, so they fail the build too; suppress them with --no-unpinned, or raise --min-severity to filter advisory findings out of both the report and the exit code.

Recommended workflow for Claude

1. Run offline first for a fast baseline, then --online for full coverage if the user has network access.
2. For each vulnerable package, recommend the minimum fixed version and note breaking-change risk.
3. Encourage exact pins (== / lockfiles) for reproducible, auditable builds.

Note

The bundled DB is intentionally small (well-known historical CVEs) so the tool is self-contained and testable. For comprehensive coverage use --online (OSV.dev) or integrate a dedicated scanner; treat the offline DB as a fast first pass.