Test Error States
Test Error States is an agent skill (a SKILL.md file) from reticlehq/reticle. Force the states a happy-path run never reaches (a failing API, an empty list, a slow request, a timeout, an expired… It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 1,271 GitHub stars across a repository of 2 listed skills.
github.com/reticlehq/reticle/skills/test-error-states (opens in a new tab)
Data as of from the GitHub API; description from the skill's SKILL.md. Report an error
- Multi-skill repo
- Plugin marketplace
- Testing & QA
- Active
Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add reticlehq/reticle
/plugin install reticle@reticlehqIn the Claude apps, zip the test-error-states folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).
ChatGPT / Codex
Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:
git clone --depth 1 https://github.com/reticlehq/reticle.git
cp -r reticle/skills/test-error-states .agents/skills/test-error-states # repo; ~/.agents/skills for all projectsStandalone skills also load in the ChatGPT desktop app.
Cursor
Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:
git clone --depth 1 https://github.com/reticlehq/reticle.git
cp -r reticle/skills/test-error-states .cursor/skills/test-error-states # project; ~/.cursor/skills for all projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)
What this skill does
Force the states a happy-path run never reaches (a failing API, an empty list, a slow request, a timeout, an expired session, a toast that auto-dismisses) and check the UI actually handles them. Use when error handling was written but never run, when a loading or empty state needs verifying, when a bug only happens on a slow connection, or when a timer, poll, debounce or retry needs testing without sleeping. Every app has a catch block nobody has executed and an empty state nobody has seen.
When it triggers
- Use when error handling was written but never run, when a loading or empty state needs verifying, when a bug only happens on a slow connection, or when a timer, poll, debounce or retry needs testing without sleeping.
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How do I install the Test Error States skill?
In Claude Code, run /plugin marketplace add reticlehq/reticle and then /plugin install reticle@reticlehq. For Codex or Cursor, copy the test-error-states folder into .agents/skills/ or .cursor/skills/.
Is the Test Error States skill free?
Yes. The repository is open source under the Apache-2.0 license.
Is Test Error States maintained?
The repository's most recent commit was on Oct 26, 2026. Its latest release is v3.8.0. appsgit only lists skills from repositories with a commit in the last six months.