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 kieutrongthien/skills-fullstack --skill backend-nestjsgit clone --depth 1 https://github.com/kieutrongthien/skills-fullstackWrote 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/kieutrongthien/skills-fullstack/backend-nestjs)<a href="https://agentmods.dev/skills/kieutrongthien/skills-fullstack/backend-nestjs"><img src="https://agentmods.dev/badge/skills/kieutrongthien/skills-fullstack/backend-nestjs/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/kieutrongthien/skills-fullstack/backend-nestjs"><img src="https://agentmods.dev/badge/skills/kieutrongthien/skills-fullstack/backend-nestjs.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 | $0.00024 | $0.00783 |
| Opus 5 | $0.00012 | $0.00392 |
| Sonnet 5 | $0.00005 | $0.00157 |
| Haiku 4.5 | $0.00002 | $0.00078 |
Grade A, and why
backend-nestjs 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 10d 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 — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Backend - NestJS
When to use this skill
- Creating or updating NestJS modules, controllers, services, DTOs, and pipes.
- Adding REST or GraphQL endpoints, validation, authentication, or persistence.
- Improving logging, error handling, testing, or configuration management.
Quick start
- Install deps:
npm ci(or project-standard package manager). - Env: copy
.env.example->.env; set database URL, JWT secrets, external service keys. - Dev server:
npm run start:dev; prod build:npm run buildandnpm run start:prod. - Tests:
npm test(unit) andnpm run test:e2e(e2e); lint:npm run lint.
Core patterns
- Modules group related providers/controllers; keep dependencies minimal.
- DTOs define input/output shapes; use
class-validatorandclass-transformerfor validation and transformation. - Controllers handle transport; services contain business logic; repositories/ORM clients manage data access.
- Use pipes for validation/transformation, filters for cross-cutting error shaping, guards for auth.
Coding principles
- Keep controllers thin; put business logic in services; keep data access in repositories/ORM layers.
- Validate and transform all inputs via DTOs; avoid leaking domain errors—normalize with filters/interceptors.
- Use config module (no direct
process.envreads); validate env with Joi. - Log with correlation IDs; avoid logging secrets; prefer structured logging.
- Enforce lint/format/tests/type-check/build before merge (run
scripts/dev-check.sh).
Patterns and snippets
- DTO, controller/service, config, and error filter templates live in references/snippets.md.
- Prefer guards for authz, strategies for authn; keep transactions in services.
- Map ORM errors to HTTP-friendly responses; keep domain errors typed.
Authentication and authorization
- JWT or session strategies via
@nestjs/passportandPassportStrategy. - Guards for role/permission checks; apply globally or per-route.
- Hash secrets with bcrypt/argon2; never log secrets.
What ships with it
6 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.
- 10d ago First seen · 63 lines · 24 tokens per session scan A 3404494773e5
backend-nestjs is a skill published in the GitHub repository kieutrongthien/skills-fullstack (2 stars, last pushed 7mo ago), licensed MIT. It adds 24 tokens to every session and 783 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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