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 throwing, catching, wrapping, documenting, or testing runtime errors in aa-sdk packages.
Install Error Handling
$ npx skills add alchemyplatform/aa-sdk --skill error-handling -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install alchemyplatform/aa-sdk 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/alchemyplatform/aa-sdk.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/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/alchemyplatform/aa-sdk/tree/main/.agents/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/alchemyplatform/aa-sdk/tree/main/.agents/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 alchemyplatform/aa-sdk --skill error-handling -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install alchemyplatform/aa-sdk error-handling --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alchemyplatform/aa-sdk.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/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/alchemyplatform/aa-sdk/tree/main/.agents/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 alchemyplatform/aa-sdk --skill error-handling -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install alchemyplatform/aa-sdk error-handling --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alchemyplatform/aa-sdk.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/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/alchemyplatform/aa-sdk/tree/main/.agents/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/alchemyplatform/aa-sdk.git --path .agents/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 alchemyplatform/aa-sdk --skill error-handling -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install alchemyplatform/aa-sdk error-handling --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alchemyplatform/aa-sdk.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/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/alchemyplatform/aa-sdk/tree/main/.agents/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 alchemyplatform/aa-sdk 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 alchemyplatform/aa-sdk --skill error-handling -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/alchemyplatform/aa-sdk.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/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/alchemyplatform/aa-sdk/tree/main/.agents/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 alchemyplatform/aa-sdk --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 alchemyplatform/aa-sdk error-handling --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alchemyplatform/aa-sdk.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/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/alchemyplatform/aa-sdk/tree/main/.agents/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
- 321
- Token cost
- ~299 tokens
- SKILL.md length
- 79 words
- Files
- 4
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when throwing, catching, wrapping, documenting, or testing runtime errors in aa-sdk packages.
- Testing runtime errors in aa-sdk packages
- SKILL.md covers Rules and Evidence
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve Error handling
What it does
Error Handling is an agent skill from alchemyplatform/aa-sdk. Use when throwing, catching, wrapping, documenting, or testing runtime errors in aa-sdk packages.
Its SKILL.md is about 300 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files (for example `rules/base-error.md`, `rules/no-plain-error.md` and `rules/raise-footgun.md`).
It sits in Development, covering Error handling. It works with viem and wagmi. The licence is MIT.
When your agent uses it
- Testing runtime errors in aa-sdk packages
- Tasks that involve Error handling
Example prompts
- “/error-handling”
What it can do on your machine
Read from SKILL.md and the folder at commit 2d60342. 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
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
Error Handling loads about 299 tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 79 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 alchemyplatform/aa-sdk at commit 2d60342, republished under its MIT licence (© alchemyplatform). 79 words, ~299 tokens.
Download SKILL.mdSave it as
.claude/skills/error-handling/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- error-handling
- description
- Use when throwing, catching, wrapping, documenting, or testing runtime errors in aa-sdk packages.
- last_verified
- 2026-05-06
Error Handling
Runtime package errors should use the SDK error hierarchy rooted at
@alchemy/common BaseError.
Rules
| Rule | When to read |
|---|---|
| BaseError | Before adding package runtime errors. |
| No plain Error | Before writing throw statements in packages/. |
| Raise footgun | Before using or modifying raise. |
Evidence
packages/common/src/errors/BaseError.tsextends viem'sBaseError..eslintrcforbidsthrow new Error(...)inpackages/**/*except tests..eslintrcforbidsimport { BaseError } from "viem"to prevent accidentally using viem'sBaseErrorinstead of@alchemy/common's.packages/wallet-apis/src/utils/schema.tswraps Zod validation failures in@alchemy/commonBaseError.
© alchemyplatform, 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 3 other files in .agents/skills/error-handling of alchemyplatform/aa-sdk.
- SKILL.md
- rules/base-error.md
- rules/no-plain-error.md
- rules/raise-footgun.md
Open the folder on GitHubat commit 2d60342
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 skillalchemyplatform/aa-sdk | 321 | — | ~299 | Automated safety check: Pass | MIT | |
| Mole Bug Patternstw93/Mole | 69k | — | ~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 | |
| Wagmi Feature Developmentwevm/wagmi | 6.8k | — | ~3.8k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Error Handling
What does Error Handling do?
A skill your agent uses when throwing, catching, wrapping, documenting, or testing runtime errors in aa-sdk packages. Error Handling is an agent skill from alchemyplatform/aa-sdk. Use when throwing, catching, wrapping, documenting, or testing runtime errors in aa-sdk packages.
When should I use Error Handling?
Error Handling fits situations like: testing runtime errors in aa-sdk packages; tasks that involve Error handling.
How do I install Error Handling in Claude Code?
Run `npx skills add alchemyplatform/aa-sdk --skill error-handling -a claude-code`. Or copy the skill folder (.agents/skills/error-handling in alchemyplatform/aa-sdk) 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 alchemyplatform/aa-sdk --skill error-handling -a codex`. Or copy the skill folder (.agents/skills/error-handling in alchemyplatform/aa-sdk) 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 alchemyplatform/aa-sdk --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 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 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 299 tokens (SKILL.md is roughly 1.2k 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 Error Handling?
Skills that share tags, products or a category with Error Handling: Mole Bug Patterns (tw93/Mole, 69k 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?
alchemyplatform (a GitHub organization) maintains it in alchemyplatform/aa-sdk, which has 321 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on October 5, 2026.
Source: alchemyplatform/aa-sdk on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.