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error-handling-patterns SKILL.md skillA

This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.

error-handling-patterns from khaledsaeed18/dotclaude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add khaledsaeed18/dotclaude/error-handling-patterns@git:20260921.8d3f9eb

Pins git:20260921.8d3f9eb in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: khaledsaeed18/dotclaude
Path: skills/engineering/error-handling-patterns/SKILL.md
Versions recorded: 1
Latest version: git:20260921.8d3f9eb, committed Sep 21, 2026
Size: 6,287 bytes
Repository stars: 5
License: MIT

Design and review error handling in a codebase: which errors are expected results versus bugs, typed error hierarchies or result types, where to catch (boundaries) and where never to, preserving cause chains, mapping errors to HTTP and CLI exit codes, retries with backoff for the transient, timeouts everywhere, and the logging that makes a failure diagnosable; with idioms for TypeScript, Python, Go, and Rust. Use when adding error handling to new code, when a codebase has inconsistent or…

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 has one purpose: when something goes wrong, the right party finds out, with enough context to act, and the system stays in a known state. Every pattern below is judged by that.

## First decision: expected outcome or bug?

- **Expected outcomes** (not found, validation failed, permission denied, rate limited, conflict) are part of the function's contract. Represent them in the type: a result type, a discriminated union, a documented typed error. Callers handle them.
- **Bugs and infrastructure failures** (null where impossible, invariant broken, database down, out of memory) are exceptions. They propagate to a boundary that logs them and fails the operation; code in between does not catch them.

Mixing the two (throwing for "not found", or returning null for "database down") produces both noisy logs and silent failures.

## Represent errors with types

- Base error class per domain (`AppError` with `code`, `httpStatus`, `isOperational`), subclasses for categories (`NotFoundError`, `ValidationError`, `ConflictError`, `UpstreamError`). One place maps code to status and to user message.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add khaledsaeed18/dotclaude/error-handling-patterns@sha256:256dd350c718c553

The line at the top of this page pins the label git:20260921.8d3f9eb, 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](https://markdownregistry.com/badge/art_oyobfqtjm7i2rfgx.svg)](https://markdownregistry.com/a/art_oyobfqtjm7i2rfgx)

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

Versions

The registry has recorded 1 version of this file, committed on Sep 21, 2026.

version	committed	commit	size	audit
git:20260921.8d3f9eb latest	2026-09-21	8d3f9eb	6,287 B	A	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 (6287 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

khaledsaeed18/dotclaude · 5 stars · license MIT · pushed 2026-10-21 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_oyobfqtjm7i2rfgx
GET https://markdownregistry.com/api/v1/resolve?ref=khaledsaeed18/dotclaude/error-handling-patterns
GET https://markdownregistry.com/api/v1/blob/256dd350c718c5533cf84a225897efab7fa1100fe1646c2580897d4e19e6ecbf

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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