error-handling SKILL.md skillA

error-handling from komluk/scaffolding is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add komluk/scaffolding/error-handling@git:20260614.9d809af

Pins git:20260614.9d809af in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
komluk/scaffolding
Path
skills/error-handling/SKILL.md
Versions recorded
3
Latest version
git:20260614.9d809af, committed Jun 14, 2026
First version recorded
Apr 9, 2026
Size
5,205 bytes
Repository stars
16
License
MIT

Consistent error handling across frontend and backend layers. TRIGGER when: implementing error boundaries, exception handlers, or try/catch blocks. SKIP: shaping HTTP error response bodies (use api-design); logging the error (use logging-standards). (Examples in React + Python.).

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Error Handling Skill

## Purpose
Standards for consistent error handling across frontend and backend layers (examples in React + Python).

## Auto-Invoke Triggers
- Implementing exception handling
- Creating custom exceptions
- Handling API errors
- Implementing retry logic
- Designing user-facing error messages

---

## Error Categories

| Category | HTTP Code | User Action | Log Level |
|----------|-----------|-------------|-----------|
| Validation | 400 | Show field errors | WARN |
| Authentication | 401 | Redirect to login | WARN |
| Authorization | 403 | Show permission denied | WARN |
| NotFound | 404 | Show not found message | INFO |
| Conflict | 409 | Show conflict details | WARN |
| RateLimit | 429 | Show retry-after | WARN |
| ExternalService | 502 | Show fallback/retry option | ERROR |
| Internal | 500 | Show generic error | ERROR |
| Critical | 500 | Show maintenance page | CRITICAL |

---

## Exception Hierarchy Design

### Principles
- Create base `AppException` class for all application errors
- Extend with specific exception types per category
- Include: code, message, status code, details (optional)
- Never expose internal details to clients
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add komluk/scaffolding/error-handling@sha256:d687bb5dbf525224

The line at the top of this page pins the label git:20260614.9d809af, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_j5ef3efy3i2hc4ix.svg)](https://markdownregistry.com/a/art_j5ef3efy3i2hc4ix)

5 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 3 versions of this file, between Apr 9, 2026 and Jun 14, 2026, about one every 33 days.

versioncommittedcommitsizeaudit
git:20260614.9d809af latest2026-06-14 9d809af 5,205 BA view · diff
git:20260520.3aa374b2026-05-20 3aa374b 5,152 BA view · diff
git:20260409.25dc3ca2026-04-09 25dc3ca 5,047 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (5205 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

komluk/scaffolding · 16 stars · license MIT · pushed 2026-11-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_j5ef3efy3i2hc4ix
GET https://markdownregistry.com/api/v1/resolve?ref=komluk/scaffolding/error-handling
GET https://markdownregistry.com/api/v1/blob/d687bb5dbf52522452dac7c64d5c320e7592b669bc18da1b5c13dea1c88f38f3

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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