A set of development guidelines for building services with NestJS, a framework for Node.js applications. It covers organizing code into modules, checking incoming data, controlling access, handling shared request behavior, connecting to databases, and testing.

Use it when creating or reviewing NestJS services, designing modules and providers, adding authentication or request validation, connecting Prisma or TypeORM, and writing unit or end-to-end tests.

It helps keep controllers small, validation at the edge of the application, and business logic organized instead of scattered across request handlers.

nestjs — Skill for Claude Code and Codex by nimadorostkar

Install

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.

Any agent

npx skills add nimadorostkar/Claude-Skills-collection --skill nestjs

Clone the repo

git clone --depth 1 https://github.com/nimadorostkar/Claude-Skills-collection

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/nimadorostkar/claude-skills-collection/nestjs/github.svg)](https://agentmods.dev/skills/nimadorostkar/claude-skills-collection/nestjs)

Your own site

<a href="https://agentmods.dev/skills/nimadorostkar/claude-skills-collection/nestjs"><img src="https://agentmods.dev/badge/skills/nimadorostkar/claude-skills-collection/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/nimadorostkar/claude-skills-collection/nestjs"><img src="https://agentmods.dev/badge/skills/nimadorostkar/claude-skills-collection/nestjs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,075 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Data Exfiltration · line 112
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00035	$0.01075
Opus 5	$0.00017	$0.00537
Sonnet 5	$0.00007	$0.00215
Haiku 4.5	$0.00003	$0.00108

Measured 12d ago against content hash 9ced6d3c42a4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

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 12d 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.

skills/backend/nestjs/SKILL.md · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.

NestJS

Purpose

Build NestJS applications where the module graph reflects the domain, validation happens at the edge, and cross-cutting concerns live in guards and interceptors rather than being copied into every controller.

When to Use

Building or reviewing a NestJS service.
Structuring modules, providers, and their scopes.
Implementing authentication, authorization, and request validation.
Writing unit and end-to-end tests for a Nest application.

Capabilities

Module and provider design, including dynamic modules.
Validation with class-validator and the global ValidationPipe.
Guards (authorization), interceptors (cross-cutting), filters (error mapping).
Data access with Prisma or TypeORM, correctly scoped.
Testing with the Nest testing module and Supertest.

Inputs

The domain boundaries the modules should follow.
The authentication scheme and the authorization model.
The persistence layer.

Outputs

Modules that encapsulate a domain and export only their public services.
A global validation pipe with whitelisting enabled.
Controllers that are thin, and services that contain the logic.

Workflow

Model the modules on the domain — One module per bounded capability, exporting the services other modules may use. A module that exports everything is not a boundary.
Enable strict validation globally — whitelist: true and forbidNonWhitelisted: true. Without these, a client can send extra fields and your DTO will happily carry them into the service.
Push cross-cutting concerns out of controllers — Auth in a guard, logging and timing in an interceptor, error mapping in an exception filter.
Keep providers stateless and singleton — Request-scoped providers cascade: anything that injects one becomes request-scoped too, and performance degrades quietly.
Test at two levels — Unit tests for services with mocked dependencies, and end-to-end tests through the real HTTP stack with a real (containerized) database.

Read the full file on GitHub · 125 lines

Changes

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.

12d ago First seen · 125 lines · 35 tokens per session scan A 9ced6d3c42a4

Subscribe to this mod's changes

nestjs is a skill published in the GitHub repository nimadorostkar/Claude-Skills-collection (26 stars, last pushed 25d ago), licensed MIT. It adds 35 tokens to every session and 1,075 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 2026-08-30.

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