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Agent skill

Nestjs Error Handling

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Implement Global Exception Filters and standard error formats in NestJS.

MITAuto-check passedBackend & APIs

Install Nestjs Error Handling

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill nestjs-error-handling -a claude-code

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

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard nestjs-error-handling --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-error-handling .claude/skills/nestjs-error-handling && 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-error-handling
GitHub stars
572
Token cost
~600 tokens
SKILL.md length
195 words
Files
2
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Implement Global Exception Filters and standard error formats in NestJS.

  • Works in 3 steps: Service: Throws specific or generic… → Interceptor: Maps low-level errors to… → Global Filter: Formats final JSON…
  • Implementing global exception filters
  • SKILL.md covers Priority: P1 (HIGH), Error Flow, Built-in Exceptions and Logging, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Nestjs Error Handling is an agent skill from HoangNguyen0403/agent-skills-standard. Implement Global Exception Filters and standard error formats in NestJS. Use when implementing global exception filters or standardizing error responses in NestJS.

Its SKILL.md is about 600 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `evals/evals.json`).

It sits in Backend & APIs, covering Error handling. 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 global exception filters
  • Standardizing error responses in NestJS

Example prompts

  • “/nestjs-error-handling”

Workflow steps

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

  1. Service: Throws specific or generic errors (e.g., EntityNotFoundError).
  2. Interceptor: Maps low-level errors to HTTP Exceptions (e.g., catchError(err => throw new NotFoundException())).
  3. Global Filter: Formats final JSON response.

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 (its code samples are json).

    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 Error Handling loads about 600 tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 195 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~600

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). 195 words, ~600 tokens.

Download SKILL.mdSave it as .claude/skills/nestjs-error-handling/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
nestjs-error-handling
description
Implement Global Exception Filters and standard error formats in NestJS. Use when implementing global exception filters or standardizing error responses in NestJS.

NestJS Error Handling Standards

Priority: P1 (HIGH)

  • Requirement: Centralize error formatting.
  • Platform Agnostic: not import Request/Response from Express/Fastify types directly.
  • Use: HttpAdapterHost to access underlying platform response methods.
  • const { httpAdapter } = this.httpAdapterHost;
  • Structure:
  • Implement strictly typed error responses.
  • Refer to API Standards for ApiErrorResponse.
json
 {
   "statusCode": 400,
   "message": "Validation failed",
   "error": "Bad Request",
   "timestamp": "ISO...",
   "path": "/users"
 }

Error Flow

  1. Service: Throws specific or generic errors (e.g., EntityNotFoundError).
  2. Interceptor: Maps low-level errors to HTTP Exceptions (e.g., catchError(err => throw new NotFoundException())).
  • Why: Keeps Exception Filters focused on formatting, not business logic interpretation.
  1. Global Filter: Formats final JSON response.

Built-in Exceptions

  • Use: Throw NotFoundException, ForbiddenException, BadRequestException.
  • Custom: Extend HttpException only for domain-specific failures that need specific status codes.

Logging

  • Context: Always pass MyClass.name to Logger constructor.
  • Levels:
  • error: 500s (Stack trace required).
  • warn: 400s (Client errors).

Security (Information Leakage)

  • Production: NEVER expose stack traces in HTTP responses (process.env.NODE_ENV === 'production').
  • Sanitization: Ensure ApiException payloads not leak internal file paths or raw variable dumps.

Anti-Patterns

  • No stack traces in production: Gate stack exposure behind NODE_ENV === 'production' check.
  • No Express types in filters: Use HttpAdapterHost for platform-agnostic error handling.
  • No HttpException in services: Throw domain errors in services; let Interceptors map to HTTP exceptions.

Canonical response anchors

  • Additional task-grounded exact anchors: sanitiz

© 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 1 other file in skills/nestjs/nestjs-error-handling of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Nestjs Error Handling 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 Error Handling compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Nestjs Error Handling this skillHoangNguyen0403/agent-skills-standard572—~600Automated safety check: PassMIT
Twenty Syncable Entity Wiringtwentyhq/twenty58k—~2.9kAutomated safety check: PassCustom licence
Backendredis/RedisInsight8.9k—~1.6kAutomated safety check: PassCustom licence
Nestjs Best Practicesrolling-scopes/rsschool-app10k6 repos~1.2kAutomated safety check: PassMIT
Node Backend Development Guidelinesdiet103/claude-code-infrastructure-showcase10k2 repos~2kAutomated safety check: PassMIT
Sentry v8 Error Trackingdiet103/claude-code-infrastructure-showcase10k2 repos~2.3kAutomated safety check: NotesMIT

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Works with

Categories

Questions about Nestjs Error Handling

What does Nestjs Error Handling do?

Implement Global Exception Filters and standard error formats in NestJS. Nestjs Error Handling is an agent skill from HoangNguyen0403/agent-skills-standard. Implement Global Exception Filters and standard error formats in NestJS.

When should I use Nestjs Error Handling?

Nestjs Error Handling fits situations like: implementing global exception filters; standardizing error responses in NestJS.

How do I install Nestjs Error Handling in Claude Code?

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

How do I install Nestjs Error Handling in Codex?

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

Can I use Nestjs Error Handling 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-error-handling -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-error-handling, .gemini/skills/nestjs-error-handling, .github/skills/nestjs-error-handling and .opencode/skills/nestjs-error-handling in your project.

What does Nestjs Error Handling need to run?

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

Does Nestjs Error Handling 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 Error Handling 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 Error Handling use?

Nestjs Error Handling 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 Error Handling use?

About 600 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.

What are the alternatives to Nestjs Error Handling?

Skills that share tags, products or a category with Nestjs Error Handling: Twenty Syncable Entity Wiring (twentyhq/twenty, 58k stars), Backend (redis/RedisInsight, 8.9k stars), Nestjs Best Practices (rolling-scopes/rsschool-app, 10k stars) and Node Backend Development Guidelines (diet103/claude-code-infrastructure-showcase, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nestjs Error Handling?

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.