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Agent skill

Nestjs API Standards

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Create standardized API response envelopes, paginated endpoints, and error interceptors in NestJS.

MITAuto-check passedBackend & APIs

Install Nestjs API Standards

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill nestjs-api-standards -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard nestjs-api-standards --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/nestjs/nestjs-api-standards .claude/skills/nestjs-api-standards && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
nestjs-api-standards
GitHub stars
572
Token cost
~605 tokens
SKILL.md length
202 words
Files
5 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Create standardized API response envelopes, paginated endpoints, and error interceptors in NestJS.

  • Works in 5 steps: Create Response DTO — Define dedicated… → Map entity to DTO — Use… → Apply TransformInterceptor — Bind… → …
  • Implementing response wrappers
  • SKILL.md covers Priority: P1 (HIGH), Workflow: Standardize API…, Response Wrapper Example and Entity-to-DTO Mapping Example, plus 5 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Nestjs API Standards is an agent skill from HoangNguyen0403/agent-skills-standard. Create standardized API response envelopes, paginated endpoints, and error interceptors in NestJS. Use when implementing response wrappers, pagination DTOs, or global error formats.

Its SKILL.md is about 610 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `evals/evals.json`, `references/error-response.md` and `references/implementation.md`).

It sits in Backend & APIs. It works with NestJS. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Implementing response wrappers
  • Pagination DTOs
  • Global error formats

Example prompts

  • “/nestjs-api-standards”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Create Response DTO — Define dedicated DTO for every endpoint return type.
  2. Map entity to DTO — Use plainToInstance(UserResponseDto, user) in service or controller.
  3. Apply TransformInterceptor — Bind globally to wrap all responses in { statusCode, data, meta }.
  4. Add nested validation — Decorate nested DTO properties with @ValidateNested() + @Type().
  5. Document with Swagger — Apply @ApiResponse({ status, type }) with exact types per endpoint.

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nestjs API Standards loads about 605 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 51 tokens; SKILL.md has 202 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~605
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 202 words, ~605 tokens.

Download SKILL.mdSave it as .claude/skills/nestjs-api-standards/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
nestjs-api-standards
description
Create standardized API response envelopes, paginated endpoints, and error interceptors in NestJS. Use when implementing response wrappers, pagination DTOs, or global error formats.

NestJS API Standards & Common Patterns

Priority: P1 (HIGH)

Workflow: Standardize API Endpoint

  1. Create Response DTO — Define dedicated DTO for every endpoint return type.
  2. Map entity to DTO — Use plainToInstance(UserResponseDto, user) in service or controller.
  3. Apply TransformInterceptor — Bind globally to wrap all responses in { statusCode, data, meta }.
  4. Add nested validation — Decorate nested DTO properties with @ValidateNested() + @Type().
  5. Document with Swagger — Apply @ApiResponse({ status, type }) with exact types per endpoint.

Response Wrapper Example

See implementation examples

Entity-to-DTO Mapping Example

See implementation examples

Deep Validation (Critical)

  • [Rule] Nested Validation: Object/array DTO properties require @ValidateNested() + @Type(() => TargetDto) from class-transformer.

Pagination Standards

  • DTOs: Use strict PageOptionsDto (page/take/order) and PageDto<T> (data/meta).
  • Swagger Logic: Generics require ApiExtraModels and schema path resolution.
  • Reference: See Pagination Wrapper Implementation for complete ApiPaginatedResponse decorator code.

Custom Error Response

  • Standard Error Object: Define ApiErrorResponse with statusCode, message, error, timestamp, path. See Error Response Class.
  • Docs: Apply @ApiBadRequestResponse({ type: ApiErrorResponse }) globally or per controller.

Anti-Patterns

  • No raw entity returns: Always map to Response DTO; raw entities leak internal fields.
  • No unvalidated nested DTOs: Use @ValidateNested() + @Type() for all nested object properties.
  • No generic 200 docs: Apply @ApiResponse({ status, type }) with exact types per endpoint.

References

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (references) in skills/nestjs/nestjs-api-standards of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/error-response.md
  • references/implementation.md
  • references/pagination-wrapper.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Nestjs API Standards next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Nestjs API Standards compared with similar skills
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Nestjs Trpctrycompai/crm11k—~2.8kAutomated safety check: PassMIT
Twenty Syncable Entity Wiringtwentyhq/twenty58k—~2.9kAutomated safety check: PassCustom licence
Backendredis/RedisInsight8.9k—~1.6kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Nestjs API Standards

What does Nestjs API Standards do?

Create standardized API response envelopes, paginated endpoints, and error interceptors in NestJS. Nestjs API Standards is an agent skill from HoangNguyen0403/agent-skills-standard. Create standardized API response envelopes, paginated endpoints, and error interceptors in NestJS.

When should I use Nestjs API Standards?

Nestjs API Standards fits situations like: implementing response wrappers; pagination DTOs; global error formats.

How do I install Nestjs API Standards in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill nestjs-api-standards -a claude-code`. Or copy the skill folder (skills/nestjs/nestjs-api-standards in HoangNguyen0403/agent-skills-standard) into .claude/skills/nestjs-api-standards in your project. Claude Code loads it when a task matches its description.

How do I install Nestjs API Standards in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill nestjs-api-standards -a codex`. Or copy the skill folder (skills/nestjs/nestjs-api-standards in HoangNguyen0403/agent-skills-standard) into .agents/skills/nestjs-api-standards in your project. Codex loads it when a task matches its description.

Can I use Nestjs API Standards in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill nestjs-api-standards -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nestjs-api-standards, .gemini/skills/nestjs-api-standards, .github/skills/nestjs-api-standards and .opencode/skills/nestjs-api-standards in your project.

What does Nestjs API Standards need to run?

SKILL.md names no scripts, command-line tools or credentials: Nestjs API Standards is instructions for the agent only.

Does Nestjs API Standards access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Nestjs API Standards safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Nestjs API Standards use?

Nestjs API Standards is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Nestjs API Standards use?

About 605 tokens (SKILL.md is roughly 2.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 738 tokens, read only when the agent opens those files.

What are the alternatives to Nestjs API Standards?

Skills that share tags, products or a category with Nestjs API Standards: Nestjs Best Practices (rolling-scopes/rsschool-app, 10k stars), Twenty Syncable Entity Validation (twentyhq/twenty, 58k stars), Nestjs Trpc (trycompai/crm, 11k stars) and Twenty Syncable Entity Wiring (twentyhq/twenty, 58k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nestjs API Standards?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.