Mole Bug Patterns
tw93/Mole
A catalog of recurring bug shapes in the Mole Mac cleaner, used to review safety-sensitive diffs for deletion safety, unbounded commands, shell traps and weak tests.
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Implement proper error handling.
Install Error Handling
$ npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist error-handling --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/error-handling .claude/skills/error-handling && rm -rf skills-srcUse ~/.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/
Install the "error-handling" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/error-handling into .claude/skills/error-handling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-handling", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/error-handlingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist error-handling --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/error-handling .agents/skills/error-handling && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "error-handling" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/error-handling into .agents/skills/error-handling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-handling", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist error-handling --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/error-handling .cursor/skills/error-handling && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "error-handling" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/error-handling into .cursor/skills/error-handling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-handling", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/thedaviddias/Front-End-Checklist.git --path skills/error-handling--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist error-handling --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/error-handling .gemini/skills/error-handling && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "error-handling" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/error-handling into .gemini/skills/error-handling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-handling", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install thedaviddias/Front-End-Checklist error-handlingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/error-handling .github/skills/error-handling && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "error-handling" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/error-handling into .github/skills/error-handling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-handling", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist error-handling --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/error-handling .opencode/skills/error-handling && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "error-handling" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/error-handling into .opencode/skills/error-handling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-handling", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
error-handling- GitHub stars
- 74k
- Token cost
- ~416 tokens
- SKILL.md length
- 150 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Implement proper error handling.
- Reviewing scripts
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Client components
What it does
Error Handling is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Implement proper error handling. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
Its SKILL.md is about 420 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
It sits in Development, covering Error handling. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Reviewing scripts
- Client components
- Runtime behavior related to Implement proper error handling
Example prompts
- “/error-handling”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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
Links to these hosts (documentation or services it may open):
frontendchecklist.io
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
Error Handling loads about 416 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 59 tokens; SKILL.md has 150 words of instructions outside code blocks.
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 thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 150 words, ~416 tokens.
Download SKILL.mdSave it as
.claude/skills/error-handling/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- error-handling
- description
- Use when reviewing scripts, client components, bundles, or runtime behavior related to Implement proper error handling. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
- metadata.category
- javascript
- metadata.priority
- high
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 20
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/javascript/error-handling
Implement proper error handling
Unhandled errors crash applications, create poor user experiences, and make debugging impossible without proper context.
Quick Reference
- Wrap async operations in try-catch blocks
- Use Error Boundaries in React for UI-level error handling
- Log errors with context for debugging
- Always re-throw or handle—never silently swallow errors
Check
Review error handling in this code, ensuring async operations use try-catch and errors are properly logged.
Fix
Add try-catch blocks to async operations and implement error boundaries for React components.
Explain
Explain JavaScript error handling best practices including try-catch, Promise rejection, and error boundaries.
Code Review
Review scripts, client components, and browser execution paths related to Implement proper error handling. Flag exact imports, event handlers, runtime side effects, or blocking operations that violate the rule, and state how the change should be verified in the browser.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/javascript/error-handling
© thedaviddias, 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 (references) in skills/error-handling of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Error Handling this skillthedaviddias/Front-End-Checklist | 74k | — | ~416 | Automated safety check: Pass | MIT | |
| Mole Bug Patternstw93/Mole | 70k | — | ~2k | Automated safety check: Pass | GPL-3.0 | |
| Native Data FetchingCherryHQ/cherry-studio-app | 4k | 6 repos | ~2.9k | Automated safety check: Notes | MIT | |
| Rust Best Practicesfarm-fe/farm | 5.6k | 3 repos | ~1.1k | Automated safety check: Pass | MIT | |
| R Function Input Validationtidyverse/dplyr | 5.1k | 1 repos | ~2.3k | Automated safety check: Pass | Custom licence | |
| Next Best Practicesvercel-labs/openreview | 1.7k | 18 repos | ~1k | Automated safety check: Pass | None |
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Rust Best Practices
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Guide for writing idiomatic Rust code based on Apollo GraphQL's best practices handbook.
R Function Input Validation
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Validates arguments of exported R functions with the standalone check_* type checkers from rlang, in tidyverse style with clear error messages.
- Official
Next Best Practices
vercel-labs/openreview
Next.js best practices - file conventions, RSC boundaries, data patterns, async APIs, metadata, error handling, route handlers, image/font optimization, bundling
- Official
Error Handling
microsoft/data-formulator
统一错误处理系统。在添加 API 端点、修改错误处理、添加前端 API 调用、编写错误相关测试时使用. An agent skill from microsoft/data-formulator.
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Related
Categories
Questions about Error Handling
What does Error Handling do?
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Implement proper error handling. Error Handling is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Implement proper error handling.
When should I use Error Handling?
Error Handling fits situations like: reviewing scripts; client components; runtime behavior related to Implement proper error handling.
How do I install Error Handling in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a claude-code`. Or copy the skill folder (skills/error-handling in thedaviddias/Front-End-Checklist) into .claude/skills/error-handling in your project. Claude Code loads it when a task matches its description.
How do I install Error Handling in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill error-handling -a codex`. Or copy the skill folder (skills/error-handling in thedaviddias/Front-End-Checklist) into .agents/skills/error-handling in your project. Codex loads it when a task matches its description.
Can I use 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 thedaviddias/Front-End-Checklist --skill 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/error-handling, .gemini/skills/error-handling, .github/skills/error-handling and .opencode/skills/error-handling in your project.
What does Error Handling need to run?
SKILL.md names no scripts, command-line tools or credentials: Error Handling is instructions for the agent only.
Does Error Handling access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is 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 Error Handling use?
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 Error Handling use?
About 416 tokens (SKILL.md is roughly 1.7k 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 1.1k tokens, read only when the agent opens those files.
What are the alternatives to Error Handling?
Skills that share tags, products or a category with Error Handling: Mole Bug Patterns (tw93/Mole, 70k stars), Native Data Fetching (CherryHQ/cherry-studio-app, 4k stars), Rust Best Practices (farm-fe/farm, 5.6k stars) and R Function Input Validation (tidyverse/dplyr, 5.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Error Handling?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,412 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.