Test Writing Workflow
iOfficeAI/AionUi
Sets the test-writing workflow for the repository: risk-first scenario lists, behavior-focused Vitest tests, a full run before each commit and a coverage target.
Test development. An agent skill from foldkit/foldkit.
Install Test Development
$ npx skills add foldkit/foldkit --skill test-development -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install foldkit/foldkit test-development --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/foldkit/foldkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/repos/effect/.agents/skills/test-development .claude/skills/test-development && 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 "test-development" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/test-development into .claude/skills/test-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-development", 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/foldkit/foldkit/tree/main/repos/effect/.agents/skills/test-developmentType 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 foldkit/foldkit --skill test-development -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install foldkit/foldkit test-development --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/repos/effect/.agents/skills/test-development .agents/skills/test-development && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "test-development" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/test-development into .agents/skills/test-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-development", 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 foldkit/foldkit --skill test-development -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install foldkit/foldkit test-development --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/repos/effect/.agents/skills/test-development .cursor/skills/test-development && 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 "test-development" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/test-development into .cursor/skills/test-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-development", 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/foldkit/foldkit.git --path repos/effect/.agents/skills/test-development--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 foldkit/foldkit --skill test-development -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install foldkit/foldkit test-development --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/repos/effect/.agents/skills/test-development .gemini/skills/test-development && 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 "test-development" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/test-development into .gemini/skills/test-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-development", 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 foldkit/foldkit test-developmentInstalls 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 foldkit/foldkit --skill test-development -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .github/skills && cp -r skills-src/repos/effect/.agents/skills/test-development .github/skills/test-development && 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 "test-development" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/test-development into .github/skills/test-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-development", 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 foldkit/foldkit --skill test-development -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install foldkit/foldkit test-development --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/repos/effect/.agents/skills/test-development .opencode/skills/test-development && 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 "test-development" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/test-development into .opencode/skills/test-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-development", 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
test-development- GitHub stars
- 912
- Token cost
- ~268 tokens
- SKILL.md length
- 113 words
- Files
- 4
- Skills in repo
- 17
- Repo updated
- First seen
- Licence
- MIT
At a glance
Test development. An agent skill from foldkit/foldkit.
- Changing Vitest
- Calls pnpm
- Tstyche coverage
What it does
Test Development is an agent skill from foldkit/foldkit. Test development. Use when adding or changing Vitest or Tstyche coverage. Choose Tstyche only for intended compiler behavior such as inference, assignability, rejection, or displayed public types.
Its SKILL.md is about 270 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files (for example `displayed-types.md`, `runtime.md` and `types.md`).
It sits in Testing & QA, covering Unit testing. It works with Vitest. The licence is MIT.
When your agent uses it
- Changing Vitest
- Tstyche coverage
Example prompts
- “/test-development”
What it can do on your machine
Read from SKILL.md and the folder at commit ffbbde1. 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
Shell commands in SKILL.md call:
pnpm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pnpm, which can reach the network depending on how they are called.
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
Test Development loads about 268 tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 113 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 foldkit/foldkit at commit ffbbde1, republished under its MIT licence (© foldkit). 113 words, ~268 tokens.
Download SKILL.mdSave it as
.claude/skills/test-development/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- test-development
- description
- Test development. Use when adding or changing Vitest or Tstyche coverage. Choose Tstyche only for intended compiler behavior such as inference, assignability, rejection, or displayed public types.
Choose branches from the task's acceptance criteria before editing:
- Runtime behavior: The intended result is observable when code executes. Read runtime.md.
- Compiler behavior: The intended result is TypeScript accepting, rejecting, or inferring a consumer expression in a particular way. Read types.md.
An exported signature alone is validated by pnpm check; it enters the compiler
branch only when its inference, assignability, rejection, overload selection, or
displayed type is part of the task. Some changes require both branches because
they independently change runtime and compiler behavior.
The task is complete when each intended behavior in scope has the relevant focused coverage, targeted tests pass, and applicable root checks pass or are reported as not runnable.
© foldkit, 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 repos/effect/.agents/skills/test-development of foldkit/foldkit.
- SKILL.md
- displayed-types.md
- runtime.md
- types.md
Open the folder on GitHubat commit ffbbde1
Compare with similar skills
Test Development 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 |
|---|---|---|---|---|---|---|
| Test Development this skillfoldkit/foldkit | 912 | — | ~268 | Automated safety check: Pass | MIT | |
| Test Writing WorkflowiOfficeAI/AionUi | 33k | 1 repos | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Test GuardamElnagdy/guard-skills | 1.3k | 2 repos | ~2.1k | Automated safety check: Pass | MIT | |
| Adding LLM MCP ToolsTriliumNext/Trilium | 38k | — | ~2.5k | Automated safety check: Pass | AGPL-3.0 | |
| Concept Page Test Writerleonardomso/33-js-concepts | 67k | — | ~5.5k | Automated safety check: Pass | MIT | |
| Archestra Dev Testingarchestra-ai/archestra | 4.3k | — | ~3.2k | Automated safety check: Pass | Custom licence |
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Test Guard
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Adding LLM MCP Tools
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A skill your agent uses when adding, changing, or reviewing an LLM/MCP tool in Trilium (the defineTools definitions under packages/trilium-core/src/services/llm/tools/ —…
Concept Page Test Writer
leonardomso/33-js-concepts
Generates Vitest tests for every runnable code example on a JavaScript concept documentation page, following a four-phase extraction and conversion process.
Archestra Dev Testing
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A skill your agent uses for test selection and quality across backend, frontend, and e2e; load its backend reference for Vitest projects, mocking, DB fixtures, and performance.
Vitest
pixel-point/animate-text
Vitest testing framework patterns for test setup, async testing, mocking with vi., snapshots, and test performance (formerly test-vitest).
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Related
Works with
Categories
Questions about Test Development
What does Test Development do?
Test development. An agent skill from foldkit/foldkit. Test Development is an agent skill from foldkit/foldkit. Test development.
When should I use Test Development?
Test Development fits situations like: changing Vitest; tstyche coverage.
How do I install Test Development in Claude Code?
Run `npx skills add foldkit/foldkit --skill test-development -a claude-code`. Or copy the skill folder (repos/effect/.agents/skills/test-development in foldkit/foldkit) into .claude/skills/test-development in your project. Claude Code loads it when a task matches its description.
How do I install Test Development in Codex?
Run `npx skills add foldkit/foldkit --skill test-development -a codex`. Or copy the skill folder (repos/effect/.agents/skills/test-development in foldkit/foldkit) into .agents/skills/test-development in your project. Codex loads it when a task matches its description.
Can I use Test Development 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 foldkit/foldkit --skill test-development -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-development, .gemini/skills/test-development, .github/skills/test-development and .opencode/skills/test-development in your project.
What does Test Development need to run?
Going by SKILL.md and its folder, Test Development needs the command-line tools its instructions call (pnpm).
Does Test Development 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 Test Development 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 Test Development use?
Test Development 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 Test Development use?
About 268 tokens (SKILL.md is roughly 1.1k 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 Test Development?
Skills that share tags, products or a category with Test Development: Test Writing Workflow (iOfficeAI/AionUi, 33k stars), Test Guard (amElnagdy/guard-skills, 1.3k stars), Adding LLM MCP Tools (TriliumNext/Trilium, 38k stars) and Concept Page Test Writer (leonardomso/33-js-concepts, 67k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Test Development?
foldkit (a GitHub organization) maintains it in foldkit/foldkit, which has 912 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 7, 2026.
Source: foldkit/foldkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.