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 agentmods add skills/cloudnative-co/claude-code-starter-kit/security-reviewnpx skills add cloudnative-co/claude-code-starter-kit --skill security-reviewgit clone --depth 1 https://github.com/cloudnative-co/claude-code-starter-kitWhat 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 | $0.00036 | $0.00659 |
| Opus 5 | $0.00018 | $0.00329 |
| Sonnet 5 | $0.00007 | $0.00132 |
| Haiku 4.5 | $0.00004 | $0.00066 |
Grade A, and why
security-review scanned grade A with 0 findings 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 2d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security Review Skill
Ensures all code follows security best practices and identifies potential vulnerabilities.
When to Activate
- Implementing authentication or authorization
- Handling user input or file uploads
- Creating new API endpoints
- Working with secrets or credentials
- Implementing payment features
- Storing or transmitting sensitive data
- Integrating third-party APIs
Security Checklist Categories
Review each category. See references/vulnerability-patterns.md for WRONG/CORRECT code examples.
- Secrets Management -- No hardcoded secrets; all in env vars;
.env*gitignored - Input Validation -- Schema validation; file upload size/type/extension checks
- SQL Injection -- Parameterized queries only; no string concatenation
- Auth & Authorization -- httpOnly cookies; RBAC; row-level/object-level authorization where needed
- XSS Prevention -- DOMPurify for user HTML; CSP headers configured
- CSRF Protection -- CSRF tokens on state-changing ops; SameSite=Strict cookies
- Rate Limiting -- All endpoints rate-limited; stricter on expensive operations
- Data Exposure -- No secrets in logs; generic error messages to users
- High-Risk Integrations -- Payments, wallets, third-party APIs, and webhooks validated when present
- Dependencies --
npm auditclean; lock files committed; Dependabot enabled
Full checkbox checklist: assets/security-checklist.md
Pre-Deployment Checklist
Before ANY production deployment, confirm ALL of the following:
- No hardcoded secrets, all in env vars
- All user inputs validated
- All queries parameterized
- User content sanitized (XSS)
- CSRF protection enabled
- Proper token handling (httpOnly cookies)
- Authorization role checks in place
- Rate limiting on all endpoints
- HTTPS enforced
- Security headers configured (CSP, X-Frame-Options)
- No sensitive data in error messages or logs
- Dependencies up to date, no vulnerabilities
- CORS properly configured
- File uploads validated (size, type)
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 68 lines · 36 tokens per session scan A b2f6eb63e670
security-review is a skill published in the GitHub repository cloudnative-co/claude-code-starter-kit (147 stars, last pushed 9d ago), licensed MIT. It adds 36 tokens to every session and 659 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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