Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add GoldenWing-360/claude-security-skills --skill dependency-supply-chaingit clone --depth 1 https://github.com/GoldenWing-360/claude-security-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/goldenwing-360/claude-security-skills/dependency-supply-chain)<a href="https://agentmods.dev/skills/goldenwing-360/claude-security-skills/dependency-supply-chain"><img src="https://agentmods.dev/badge/skills/goldenwing-360/claude-security-skills/dependency-supply-chain/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/goldenwing-360/claude-security-skills/dependency-supply-chain"><img src="https://agentmods.dev/badge/skills/goldenwing-360/claude-security-skills/dependency-supply-chain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00081 | $0.02405 |
| Opus 5 | $0.00041 | $0.01203 |
| Sonnet 5 | $0.00016 | $0.00481 |
| Haiku 4.5 | $0.00008 | $0.00241 |
Grade A, and why
dependency-supply-chain scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s "https://api.npmjs.org/downloads/point/last-week/<pkg>" | jq How it starts
The opening of the file, as written. The whole thing — 217 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dependency / Supply-Chain Security
The supply chain is the part of your stack you trust by default and rarely review. npm, PyPI, RubyGems, Maven, Go modules — they have all hosted malicious packages, typosquats, and compromised maintainer accounts at scale.
This skill is the working developer's defense — pragmatic checks that fit in a normal workflow, not a software bill-of-materials regulatory program.
When to invoke
- Adding a new dependency to a project (especially a small / new / single-maintainer one)
- After a publicized supply-chain incident affecting your ecosystem
- Quarterly audit of
package.json/requirements.txt/go.mod - Inheriting a project with a large
node_modulesand no obvious hygiene - CI/CD just leaked a secret — start here to find which dep grabbed it
The threat model
What can a malicious dependency actually do?
- Read environment variables / files during install (postinstall script)
- Read environment variables / files at runtime (any code path)
- Exfiltrate via outbound HTTPS to any host
- Modify other dependencies (link-stage tampering, build-script monkey-patching)
- Hide payloads in transitive deps so your
package.jsonlooks clean
You cannot inspect every line of every dependency. You can raise the cost of attacks and detect them when they happen.
Lockfile hygiene
A lockfile is the only thing standing between "I added one dep" and "my install grabbed 1,200 transitive deps any of which can be swapped tomorrow".
- Commit the lockfile. Always:
package-lock.json,pnpm-lock.yaml,yarn.lock,poetry.lock,Pipfile.lock,go.sum. No exceptions. npm ci(orpnpm install --frozen-lockfile) in CI, notnpm install.installcan mutate the lockfile silently;cierrors if the lockfile andpackage.jsondisagree.- Lockfile drift alerts. A PR that touches
package-lock.jsonbut notpackage.json, or vice versa, deserves a review comment. Add a CI check. - Pin direct dependencies tightly when the dep is small / new / sketchy.
"left-pad": "1.3.0"rather than"left-pad": "^1.3.0". The caret invites unattended updates.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 217 lines · 81 tokens per session scan A b30070a69281
dependency-supply-chain is a skill published in the GitHub repository GoldenWing-360/claude-security-skills (17 stars, last pushed 1mo ago), licensed MIT. It adds 81 tokens to every session and 2,405 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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