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 ejirocodes/agent-skills --skill nestjs-best-practicesgit clone --depth 1 https://github.com/ejirocodes/agent-skillsWrote 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/ejirocodes/agent-skills/nestjs-best-practices)<a href="https://agentmods.dev/skills/ejirocodes/agent-skills/nestjs-best-practices"><img src="https://agentmods.dev/badge/skills/ejirocodes/agent-skills/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/ejirocodes/agent-skills/nestjs-best-practices"><img src="https://agentmods.dev/badge/skills/ejirocodes/agent-skills/nestjs-best-practices.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 | $0.00185 | $0.01163 |
| Opus 5 | $0.00093 | $0.00581 |
| Sonnet 5 | $0.00037 | $0.00233 |
| Haiku 4.5 | $0.00018 | $0.00116 |
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 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 — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NestJS 11 Best Practices
Quick Reference
| Topic | When to Use | Reference |
|---|---|---|
| Core Architecture | Modules, Providers, DI, forwardRef, custom decorators | core-architecture.md |
| Request Lifecycle | Middleware, Guards, Interceptors, Pipes, Filters | request-lifecycle.md |
| Validation & Pipes | DTOs, class-validator, ValidationPipe, transforms | validation-pipes.md |
| Authentication | JWT, Passport, Guards, Local/OAuth strategies, RBAC | authentication.md |
| Database | TypeORM, Prisma, Drizzle ORM, repository patterns | database-integration.md |
| Testing | Unit tests, E2E tests, mocking providers | testing.md |
| OpenAPI & GraphQL | Swagger decorators, resolvers, subscriptions | openapi-graphql.md |
| Microservices | TCP, Redis, NATS, Kafka patterns | microservices.md |
Essential Patterns
Module with Providers
@Module({
imports: [DatabaseModule],
controllers: [UsersController],
providers: [UsersService],
exports: [UsersService], // Export for other modules
})
export class UsersModule {}
Controller with Validation
@Controller('users')
export class UsersController {
constructor(private readonly usersService: UsersService) {}
@Post()
create(@Body() createUserDto: CreateUserDto) {
return this.usersService.create(createUserDto);
}
@Get(':id')
findOne(@Param('id', ParseIntPipe) id: number) {
return this.usersService.findOne(id);
}
}
DTO with Validation
import { IsEmail, IsString, MinLength, IsOptional } from 'class-validator';
export class CreateUserDto {
@IsEmail()
email: string;
@IsString()
@MinLength(8)
password: string;
@IsOptional()
@IsString()
name?: string;
}
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.
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 · 124 lines · 185 tokens per session scan A efee56db8658
nestjs-best-practices is a skill published in the GitHub repository ejirocodes/agent-skills (6 stars, last pushed 2mo ago), licensed MIT. It adds 185 tokens to every session and 1,163 once invoked, about $0.0009 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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