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Design An Error Model

Category: Engineering  ·  Sub-category: backend  ·  Last updated:
Use when designing how a backend service (or a fleet of services) reports errors — a typed exception hierarchy (one base + per-status subclasses carrying statusCode/message/data), a validation-error flattener wired into the global ValidationPipe, a global exception filter that maps every throw to ONE uniform response body (+ trace id, severity-based logging, hide internals on 5xx), an RPC/microservice filter twin, and a log-and-swallow decorator for fire-and-forget handlers. NestJS reference, framework-flexible.
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From the source SKILL.md

One consistent error contract for a service (and ideally the whole fleet): typed exceptions → a global filter → one response shape, so clients parse errors the same way and logs are uniform. Examples NestJS/TS, neutral @org scope; the base class is AppException. principle → ▸ Example → ▸ Other stacks. This is the content of the shared infra-exception package (see structure-a-shared-backend-lib); it pairs with write-cross-cutting-code (the filter is a cross-cutting primitive) and write-service-code §7 (logging).

What this skill does

Design An Error Model is a community-contributed Claude Code skill in the backend sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/design-an-error-model/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when designing how a backend service (or a fleet of services) reports errors — a typed exception hierarchy (one base + per-status subclasses carrying statusCode/message/data), a validation-error flattener wired into the global ValidationPipe, a global exception filter that maps every throw to ONE uniform response body (+ trace id, severity-based logging, hide internals on 5xx), an RPC/microservice filter twin, and a log-and-swallow decorator for fire-and-forget handlers. NestJS reference, framework-flexible.

Who uses this skill

The Design An Error Model Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/design-an-error-model
curl -L https://claudskills.com/skills/design-an-error-model/SKILL.md \
  -o ~/.claude/skills/design-an-error-model/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/design-an-error-model/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/design-an-error-model/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\design-an-error-model\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Design An Error Model Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/design-an-error-model/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Design An Error Model skill do?
Use when designing how a backend service (or a fleet of services) reports errors — a typed exception hierarchy (one base + per-status subclasses carrying statusCode/message/data), a validation-error flattener wired into the global ValidationPipe, a global exception filter that maps every throw to ONE uniform response body (+ trace id, severity-based logging, hide internals on 5xx), an RPC/microservice filter twin, and a log-and-swallow decorator for fire-and-forget handlers. NestJS reference, framework-flexible.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Design An Error Model skill?
Use Design An Error Model when your Claude Code task falls under the Engineering category — specifically in the backend area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Design An Error Model" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Design An Error Model skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Design An Error Model is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
kennguyen887. (2026). Design An Error Model [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/design-an-error-model/
BibTeX
@misc{design-an-error-model-2026,
  author    = {kennguyen887},
  title     = {Design An Error Model [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/design-an-error-model/}
}

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Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.

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