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 dkmqflx/nestjs-best-practices-plugin --skill nestjs-securitygit clone --depth 1 https://github.com/dkmqflx/nestjs-best-practices-pluginWrote 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/dkmqflx/nestjs-best-practices-plugin/nestjs-security)<a href="https://agentmods.dev/skills/dkmqflx/nestjs-best-practices-plugin/nestjs-security"><img src="https://agentmods.dev/badge/skills/dkmqflx/nestjs-best-practices-plugin/nestjs-security/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/dkmqflx/nestjs-best-practices-plugin/nestjs-security"><img src="https://agentmods.dev/badge/skills/dkmqflx/nestjs-best-practices-plugin/nestjs-security.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 | $0.00059 | $0.00527 |
| Opus 5 | $0.00030 | $0.00264 |
| Sonnet 5 | $0.00012 | $0.00105 |
| Haiku 4.5 | $0.00006 | $0.00053 |
Grade A, and why
nestjs-security 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 9d 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.
What it actually says
NestJS Security
Hardening rules for production NestJS apps (v10/v11). These cover the gaps the framework leaves open by default — headers, rate limiting, CORS, secrets, and input validation — for both the Express and Fastify platforms.
When to Apply
- Preparing a NestJS service for production or running a security review.
- Exposing an API to the public internet or to browser clients.
- Adding security headers (helmet), rate limiting (ThrottlerModule), or CORS (enableCors).
- Handling auth: cookie-based sessions, CSRF, or password storage.
- Mitigating DoS via payload-size limits.
Rules
- helmet-security-headers — apply helmet for secure HTTP response headers (Express vs Fastify).
- rate-limiting-throttler — limit abuse with @nestjs/throttler + a global ThrottlerGuard.
- explicit-cors-origins — allowlist explicit origins; never wildcard with credentials.
- validation-as-defense — global ValidationPipe with whitelist to reject unexpected input.
- secrets-from-env — load secrets from env/secret manager; keep them out of git.
- csrf-for-cookie-auth — CSRF protection for cookie-based sessions.
- limit-payload-size — cap request body size to mitigate DoS.
- hash-passwords-and-disable-x-powered-by — bcrypt/argon2 for passwords; drop the x-powered-by header.
How to Use
Read the rule whose topic matches the change you are making, then apply the Correct pattern. When doing a full production review, walk every rule top to bottom as a checklist. Each rule notes Express vs Fastify differences where they matter — confirm which platform adapter the app uses before copying code.
What ships with it
8 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.
- rules/csrf-for-cookie-auth.md 1.4 KB
- rules/explicit-cors-origins.md 1.0 KB
- rules/hash-passwords-and-disable-x-powered-by.md 1.4 KB
- rules/helmet-security-headers.md 1.3 KB
- rules/limit-payload-size.md 1.2 KB
- rules/rate-limiting-throttler.md 1.3 KB
- rules/secrets-from-env.md 1.3 KB
- rules/validation-as-defense.md 1.3 KB
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.
- 9d ago First seen · 36 lines · 59 tokens per session scan A 56558d2e9896
nestjs-security is a skill published in the GitHub repository dkmqflx/nestjs-best-practices-plugin (1 stars, last pushed 2mo ago), licensed MIT. It adds 59 tokens to every session and 527 once invoked, about $0.0003 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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