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 giuseppe-trisciuoglio/developer-kit --skill nestjs-best-practicesgit clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kitWrote 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/giuseppe-trisciuoglio/developer-kit/nestjs-best-practices)<a href="https://agentmods.dev/skills/giuseppe-trisciuoglio/developer-kit/nestjs-best-practices"><img src="https://agentmods.dev/badge/skills/giuseppe-trisciuoglio/developer-kit/nestjs-best-practices/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/giuseppe-trisciuoglio/developer-kit/nestjs-best-practices"><img src="https://agentmods.dev/badge/skills/giuseppe-trisciuoglio/developer-kit/nestjs-best-practices.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00064 | $0.01517 |
| Opus 5 | $0.00032 | $0.00758 |
| Sonnet 5 | $0.00013 | $0.00303 |
| Haiku 4.5 | $0.00006 | $0.00152 |
Grade A, and why
nestjs-best-practices 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 today.
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 — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NestJS Best Practices
Overview
Grounded in the Official NestJS Documentation, this skill enforces modular architecture, dependency injection scoping, exception filters, DTO validation with class-validator, and Drizzle ORM integration patterns.
When to Use
- Designing/refactoring NestJS modules or dependency injection
- Creating exception filters, validating DTOs, or integrating Drizzle ORM
- Reviewing code for anti-patterns or onboarding to a NestJS codebase
Instructions
1. Modular Architecture
Follow strict module encapsulation. Each domain feature should be its own @Module():
- Export only what other modules need — keep internal providers private
- Use
forwardRef()only as a last resort for circular dependencies; prefer restructuring - Group related controllers, services, and repositories within the same module
- Use a
SharedModulefor cross-cutting concerns (logging, configuration, caching)
See references/arch-module-boundaries.md for enforcement rules.
2. Dependency Injection
Choose the correct provider scope based on use case:
| Scope | Lifecycle | Use Case |
|---|---|---|
DEFAULT |
Singleton (shared) | Stateless services, repositories |
REQUEST |
Per-request instance | Request-scoped data (tenant, user context) |
TRANSIENT |
New instance per injection | Stateful utilities, per-consumer caches |
- Default to
DEFAULTscope — only useREQUESTorTRANSIENTwhen justified - Use constructor injection exclusively — avoid property injection
- Register custom providers with
useClass,useValue,useFactory, oruseExisting
See references/di-provider-scoping.md for enforcement rules.
3. Request Lifecycle
Understand and respect the NestJS request processing pipeline:
Middleware → Guards → Interceptors (before) → Pipes → Route Handler → Interceptors (after) → Exception Filters
What ships with it
9 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.
- assets/templates/controller-template.ts 1.4 KB runs code
- assets/templates/module-template.ts 629 B runs code
- assets/templates/service-template.ts 1.5 KB runs code
- references/api-validation-dto.md 4.0 KB
- references/arch-module-boundaries.md 2.6 KB
- references/architecture.md 5.4 KB
- references/db-drizzle-patterns.md 4.9 KB
- references/di-provider-scoping.md 3.4 KB
- references/error-exception-filters.md 4.5 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.
- today First seen · 176 lines · 64 tokens per session scan A b005b2213009
nestjs-best-practices is a skill published in the GitHub repository giuseppe-trisciuoglio/developer-kit (343 stars, last pushed yesterday), licensed MIT. It adds 64 tokens to every session and 1,517 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 2026-09-10.
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