Borrowing it
Nothing to install: this file belongs to CsabaKovacs/rulesmith. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/CsabaKovacs/rulesmith/main/.agents/skills/security-reviewer/SKILL.mdgit clone --depth 1 https://github.com/CsabaKovacs/rulesmithWrote 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/csabakovacs/rulesmith/security-reviewer)<a href="https://agentmods.dev/skills/csabakovacs/rulesmith/security-reviewer"><img src="https://agentmods.dev/badge/skills/csabakovacs/rulesmith/security-reviewer/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/csabakovacs/rulesmith/security-reviewer"><img src="https://agentmods.dev/badge/skills/csabakovacs/rulesmith/security-reviewer.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 | $0.00030 | $0.00555 |
| Opus 5.5 | $0.00012 | $0.00222 |
| Sonnet 5.5 | $0.00006 | $0.00111 |
| Haiku 4.5 | $0.00003 | $0.00056 |
Grade A, and why
security-reviewer 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 1mo 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- Check for injection risks (command injection via child_process, path traversal, template injection). How it starts
The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security Review
Reviews changed files for security vulnerabilities and unsafe patterns.
When to Activate
- When changes touch: request/input handling, authentication or authorization, database queries or persistence, file upload or access, HTML rendering or user-generated content, external API calls or webhooks, or secrets/tokens/sensitive data.
- Skip when changes are purely internal logic with no external surface.
Review Methodology
Follow these steps in order:
- Identify security-relevant changes in the diff.
- Check for injection risks (command injection via child_process, path traversal, template injection).
- Verify file system safety: all paths through
resolveRepoRelative+assertPathInsideRepo. (evidence: packages/core/src/fs/safe.ts) - Check write operations restricted to
WRITE_ALLOWLIST. (evidence: packages/core/src/fs/safe.ts) - Verify MCP tool inputs validated via Zod schemas. (evidence: packages/mcp/src/server.ts)
- Check for unsafe
eval, prototype pollution, or unvalidated user input. - Verify symlink rejection in
readFileSafe. (evidence: packages/core/src/fs/safe.ts) - Classify findings as critical (block merge), important (fix before deploy), or minor (track).
- Report ONLY when issues are found — produce no output if the review passes clean.
Stack-Specific Security Rules
- Path traversal: all file paths must use
resolveRepoRelativeguards. (evidence: packages/core/src/fs/safe.ts) - Prototype pollution and unsafe
eval/innerHTMLin template or AST processing. maxBytesPerFilelimits enforced to prevent memory exhaustion. (evidence: packages/core/src/fs/safe.ts)- Artifact store TTL and max size prevent memory leaks. (evidence: packages/core/src/render/index.ts)
Boundaries
- Do NOT apply fixes — security changes require explicit human approval.
- Do NOT flag theoretical risks that cannot be exploited in the current context.
- Focus on the changed code, not pre-existing vulnerabilities (unless the change worsens them).
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.
- 1mo ago First seen · 59 lines · 30 tokens per session scan A f8ddb6fa2e25
security-reviewer is a skill published in the GitHub repository CsabaKovacs/rulesmith (15 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 30 tokens to every session and 555 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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