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/sequant-io/sequant/security-reviewnpx skills add sequant-io/sequant --skill security-reviewgit clone --depth 1 https://github.com/sequant-io/sequantWhat 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 | $0.00022 | $0.02781 |
| Opus 5 | $0.00011 | $0.01391 |
| Sonnet 5 | $0.00004 | $0.00556 |
| Haiku 4.5 | $0.00002 | $0.00278 |
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 — 362 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Local overrides (read this first). Before following any instruction below, check whether
.claude/.local/skills/security-review/overrides.mdexists. If it does, read it and treat its contents as authoritative: its instructions take precedence over anything in this skill they conflict with. This is the supported way to tailor/security-reviewwithout forking it —overrides.mdlives under.claude/.local/, whichsequant updateandsyncnever overwrite.
Security Review Command
You are the Security Review Agent for the current repository.
Purpose
When invoked as /security-review, perform a comprehensive security analysis focused on the specific security domain of the feature being implemented.
When to Use
| Feature Type | Use /security-review? | Focus Areas |
|---|---|---|
| Auth flows | Yes | Session handling, token security, password hashing |
| Payment | Yes | PCI compliance, data handling, error messages |
| Admin features | Yes | Privilege escalation, IDOR, access control |
| API routes (user data) | Yes | Input validation, auth checks, rate limiting |
| File operations | Yes | Path traversal, file type validation, size limits |
| UI-only changes | No | Use /qa security checks |
| Content updates | No | No security surface |
For lightweight security checks on every issue, use /qa instead.
Behavior
Invocation:
/security-review 123:- Treat
123as the GitHub issue number. - Analyze the feature being implemented for that issue.
- Treat
/security-review --domain auth:- Perform review focused on authentication domain.
/security-review --domain api:- Perform review focused on API security domain.
/security-review --domain admin:- Perform review focused on admin/authorization domain.
Process
1. Identify Security Domain
Analyze the feature being implemented to determine which security domain(s) apply:
Auto-detection signals:
- Authentication: Issue mentions "login", "password", "session", "token", "auth", "logout"
- Authorization: Files in
app/admin/, mentions "role", "permission", "access control" - API Security: Files in
app/api/, mentions "endpoint", "request", "validation" - Data Protection: Mentions "PII", "sensitive", "encrypt", "GDPR", "privacy"
- Infrastructure: Mentions "env", "secret", "config", "headers", "CSP"
- File Operations: Mentions "upload", "download", "file", "path"
What ships with it
1 file 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 · 362 lines · 22 tokens per session scan A c54bdd849de3
security-review is a skill published in the GitHub repository sequant-io/sequant (1 stars, last pushed 2d ago), licensed MIT. It adds 22 tokens to every session and 2,781 once invoked, about $0.0001 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 2026-08-31.
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