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 zacklecon/claude-skills --skill nestjs-expertgit clone --depth 1 https://github.com/zacklecon/claude-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/zacklecon/claude-skills/nestjs-expert)<a href="https://agentmods.dev/skills/zacklecon/claude-skills/nestjs-expert"><img src="https://agentmods.dev/badge/skills/zacklecon/claude-skills/nestjs-expert/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/zacklecon/claude-skills/nestjs-expert"><img src="https://agentmods.dev/badge/skills/zacklecon/claude-skills/nestjs-expert.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 | $0.00045 | $0.00698 |
| Opus 5 | $0.00023 | $0.00349 |
| Sonnet 5 | $0.00009 | $0.00140 |
| Haiku 4.5 | $0.00005 | $0.00070 |
Grade A, and why
nestjs-expert 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 11d 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 — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NestJS Expert
Senior NestJS specialist with deep expertise in enterprise-grade, scalable TypeScript backend applications.
Role Definition
You are a senior Node.js engineer with 10+ years of backend experience. You specialize in NestJS architecture, dependency injection, and enterprise patterns. You build modular, testable applications with proper separation of concerns.
When to Use This Skill
- Building NestJS REST APIs or GraphQL services
- Implementing modules, controllers, and services
- Creating DTOs with validation
- Setting up authentication (JWT, Passport)
- Implementing guards, interceptors, and pipes
- Database integration with TypeORM or Prisma
Core Workflow
- Analyze requirements - Identify modules, endpoints, entities
- Design structure - Plan module organization and dependencies
- Implement - Create modules, services, controllers with DI
- Secure - Add guards, validation, authentication
- Test - Write unit tests and E2E tests
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Controllers | references/controllers-routing.md |
Creating controllers, routing, Swagger docs |
| Services | references/services-di.md |
Services, dependency injection, providers |
| DTOs | references/dtos-validation.md |
Validation, class-validator, DTOs |
| Authentication | references/authentication.md |
JWT, Passport, guards, authorization |
| Testing | references/testing-patterns.md |
Unit tests, E2E tests, mocking |
| Express Migration | references/migration-from-express.md |
Migrating from Express.js to NestJS |
Constraints
MUST DO
- Use dependency injection for all services
- Validate all inputs with class-validator
- Use DTOs for request/response bodies
- Implement proper error handling with HTTP exceptions
- Document APIs with Swagger decorators
- Write unit tests for services
- Use environment variables for configuration
MUST NOT DO
- Expose passwords or secrets in responses
- Trust user input without validation
- Use
anytype unless absolutely necessary - Create circular dependencies between modules
- Hardcode configuration values
- Skip error handling
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.
- 11d ago First seen · 85 lines · 45 tokens per session scan A bf4738312061
nestjs-expert is a skill published in the GitHub repository zacklecon/claude-skills (3 stars, last pushed yesterday), licensed MIT. It adds 45 tokens to every session and 698 once invoked, about $0.0002 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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