nestjs-expert

Creates and configures NestJS modules, controllers, services, DTOs, guards, and interceptors for enterprise-grade TypeScript backend applications. Use when building NestJS REST APIs or GraphQL services, implementing dependency injection, scaffolding modular architecture, adding JWT/Passport authentication, integrating TypeORM or Prisma, or working with .module.ts, .controller.ts, and .service.ts files. Invoke for guards, interceptors, pipes, validation, Swagger documentation, and unit/E2E testing in NestJS projects.

Quality

82%

Does it follow best practices?

Impact

—

No eval scenarios have been run

Securityby

Passed

No known issues

Quality

Content

64%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

This is a solid, actionable NestJS skill with excellent executable code examples and clear constraints. Its main weaknesses are the length of inline code examples that could be offloaded to reference files, and the workflow section which lacks explicit validation/feedback loops. The opening description and knowledge reference section add tokens without much value.

Suggestions

Add explicit feedback loops to the Core Workflow (e.g., 'If lint fails, fix issues and re-run before proceeding to tests')

Move the lengthy code examples into a reference file (e.g., references/code-examples.md) and keep only a minimal example inline to improve conciseness and progressive disclosure

Remove the opening tagline ('Senior NestJS specialist...') and the Knowledge Reference keyword list — these add no actionable value for Claude

Dimension	Reasoning	Score
Conciseness	The skill is generally well-structured but includes some unnecessary framing ('Senior NestJS specialist with deep expertise in enterprise-grade, scalable TypeScript backend applications') and the code examples, while useful, are quite lengthy. The Knowledge Reference section at the bottom is a list of terms Claude already knows. However, the constraints and output templates sections are tight and useful.	2 / 3
Actionability	The skill provides fully executable, copy-paste-ready TypeScript code examples covering controllers, services, modules, DTOs, and unit tests. The constraints are specific and concrete (e.g., 'Use @Injectable() and constructor injection'), and the output templates give a clear ordering for deliverables.	3 / 3
Workflow Clarity	The Core Workflow provides a clear 6-step sequence with a verification step (lint, test, nest info), but it lacks explicit validation checkpoints and feedback loops. For example, there's no 'if lint fails, fix and re-run' or 'if DI graph shows issues, resolve circular deps before proceeding.' The workflow is more of a high-level checklist than a guided process with error recovery.	2 / 3
Progressive Disclosure	The reference table is well-structured with clear 'Load When' guidance, pointing to six separate reference files. However, since no bundle files are provided, we cannot verify these references exist. The main SKILL.md itself is quite long with extensive inline code examples that could arguably be moved to reference files, making the overview heavier than ideal.	2 / 3
	Total	9 / 12 Passed

Description

100%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

This is an excellent skill description that thoroughly covers the NestJS domain with specific actions, comprehensive trigger terms, and clear guidance on when to invoke the skill. It uses proper third-person voice throughout and provides enough specificity to distinguish it from general TypeScript or other backend framework skills. The description is detailed without being padded with fluff.

Dimension	Reasoning	Score
Specificity	Lists multiple specific concrete actions: creating modules, controllers, services, DTOs, guards, interceptors, implementing dependency injection, scaffolding modular architecture, adding JWT/Passport authentication, integrating TypeORM or Prisma, and more.	3 / 3
Completeness	Clearly answers both 'what' (creates and configures NestJS modules, controllers, services, etc.) and 'when' with explicit triggers ('Use when building NestJS REST APIs...', 'Invoke for guards, interceptors...'). The 'Use when' and 'Invoke for' clauses provide comprehensive trigger guidance.	3 / 3
Trigger Term Quality	Excellent coverage of natural terms users would say: 'NestJS', 'REST APIs', 'GraphQL', 'dependency injection', 'JWT', 'Passport', 'TypeORM', 'Prisma', '.module.ts', '.controller.ts', '.service.ts', 'guards', 'interceptors', 'pipes', 'Swagger', 'unit testing', 'E2E testing'. These are all terms a developer would naturally use when requesting help with NestJS projects.	3 / 3
Distinctiveness Conflict Risk	Highly distinctive with a clear niche focused specifically on NestJS framework development. The mention of NestJS-specific concepts like .module.ts files, NestJS guards/interceptors/pipes, and NestJS-specific tooling (TypeORM/Prisma integration within NestJS) makes it very unlikely to conflict with generic TypeScript or other backend framework skills.	3 / 3
	Total	12 / 12 Passed

Validation

100%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 11 / 11 Passed

Validation for skill structure

No warnings or errors.

Repository: Jeffallan/claude-skills
Commit: e8be415

Reviewed: 21 days ago

Table of Contents

Discovery Implementation Validation

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