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Agent skill

Wrdn Effect Vitest Tests

by UsefulSoftwareCo in UsefulSoftwareCo/executor

Keep tests deterministic and Effect-aware. An agent skill from UsefulSoftwareCo/executor.

MITAuto-check: notesTesting & QA

Install Wrdn Effect Vitest Tests

skills CLI
$ npx skills add UsefulSoftwareCo/executor --skill wrdn-effect-vitest-tests -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install UsefulSoftwareCo/executor wrdn-effect-vitest-tests --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/UsefulSoftwareCo/executor.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/wrdn-effect-vitest-tests .claude/skills/wrdn-effect-vitest-tests && rm -rf skills-src

Use ~/.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/

Facts

Skill name
wrdn-effect-vitest-tests
GitHub stars
4.1k
Token cost
~203 tokens
SKILL.md length
64 words
Files
1
Skills in repo
21
Repo updated
First seen
Licence
MIT

At a glance

Keep tests deterministic and Effect-aware. An agent skill from UsefulSoftwareCo/executor.

  • Lint flags direct vitest imports
  • SKILL.md covers Fix Shape, Bad and Good
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Conditional assertions inside tests

What it does

Wrdn Effect Vitest Tests is an agent skill from UsefulSoftwareCo/executor. Keep tests deterministic and Effect-aware. Use when lint flags direct vitest imports or conditional assertions inside tests.

Its SKILL.md is about 200 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Unit testing. It works with Vitest. The repository describes itself as: The missing integration layer for AI agents. Let them call any OpenAPI / MCP / GraphQL / custom js functions in secure environment. The licence is MIT.

When your agent uses it

  • Lint flags direct vitest imports
  • Conditional assertions inside tests

Example prompts

  • “/wrdn-effect-vitest-tests”

Requirements

  • Pre-approved tools (allowed-tools): Read, Grep, Glob, Bash

What it can do on your machine

Read from SKILL.md and the folder at commit 9ef04e9. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Grep
    • Glob
    • Bash

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

    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

Wrdn Effect Vitest Tests loads about 203 tokens when it runs. Until then it costs about 37 tokens; SKILL.md has 64 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~37
When it runs · the whole SKILL.md, loaded when a task matches
~203

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: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Grep, Glob, Bash

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 UsefulSoftwareCo/executor at commit 9ef04e9, republished under its MIT licence (© UsefulSoftwareCo). 64 words, ~203 tokens.

Download SKILL.mdSave it as .claude/skills/wrdn-effect-vitest-tests/SKILL.md (or your agent's skills folder).
name
wrdn-effect-vitest-tests
description
Keep tests deterministic and Effect-aware. Use when lint flags direct vitest imports or conditional assertions inside tests.
allowed-tools
Read, Grep, Glob, Bash

Use @effect/vitest for tests in this repo.

Fix Shape

  • Import describe, it, expect, and helpers from @effect/vitest.
  • Import utility helpers from @effect/vitest/utils when needed.
  • Do not import from raw vitest except in config or tooling files.
  • Do not put expect(...) behind if, ternary, logical, or switch branches.
  • Split conditional behavior into separate tests, or assert the branch condition and expected value explicitly.

Bad

ts
if (result.ok) {
  expect(result.value).toBe("x");
}

Good

ts
expect(result).toEqual({ ok: true, value: "x" });

© UsefulSoftwareCo, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/wrdn-effect-vitest-tests of UsefulSoftwareCo/executor.

Open the folder on GitHubat commit 9ef04e9

Compare with similar skills

Wrdn Effect Vitest Tests 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.

Wrdn Effect Vitest Tests compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Wrdn Effect Vitest Tests this skillUsefulSoftwareCo/executor4.1k—~203Automated safety check: NotesMIT
Test Writing WorkflowiOfficeAI/AionUi33k1 repos~1.2kAutomated safety check: PassApache-2.0
Vitestsupabase/supabase111k12 repos~1.1kAutomated safety check: PassApache-2.0
Test GuardamElnagdy/guard-skills1.3k2 repos~2.1kAutomated safety check: PassMIT
Adding LLM MCP ToolsTriliumNext/Trilium38k—~2.5kAutomated safety check: PassAGPL-3.0
Concept Page Test Writerleonardomso/33-js-concepts67k—~5.5kAutomated safety check: PassMIT

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Works with

Categories

Questions about Wrdn Effect Vitest Tests

What does Wrdn Effect Vitest Tests do?

Keep tests deterministic and Effect-aware. An agent skill from UsefulSoftwareCo/executor. Wrdn Effect Vitest Tests is an agent skill from UsefulSoftwareCo/executor. Keep tests deterministic and Effect-aware.

When should I use Wrdn Effect Vitest Tests?

Wrdn Effect Vitest Tests fits situations like: lint flags direct vitest imports; conditional assertions inside tests.

How do I install Wrdn Effect Vitest Tests in Claude Code?

Run `npx skills add UsefulSoftwareCo/executor --skill wrdn-effect-vitest-tests -a claude-code`. Or copy the skill folder (.agents/skills/wrdn-effect-vitest-tests in UsefulSoftwareCo/executor) into .claude/skills/wrdn-effect-vitest-tests in your project. Claude Code loads it when a task matches its description.

How do I install Wrdn Effect Vitest Tests in Codex?

Run `npx skills add UsefulSoftwareCo/executor --skill wrdn-effect-vitest-tests -a codex`. Or copy the skill folder (.agents/skills/wrdn-effect-vitest-tests in UsefulSoftwareCo/executor) into .agents/skills/wrdn-effect-vitest-tests in your project. Codex loads it when a task matches its description.

Can I use Wrdn Effect Vitest Tests 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 UsefulSoftwareCo/executor --skill wrdn-effect-vitest-tests -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/wrdn-effect-vitest-tests, .gemini/skills/wrdn-effect-vitest-tests, .github/skills/wrdn-effect-vitest-tests and .opencode/skills/wrdn-effect-vitest-tests in your project.

What does Wrdn Effect Vitest Tests need to run?

SKILL.md names no scripts, command-line tools or credentials: Wrdn Effect Vitest Tests is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Grep, Glob, Bash.

Does Wrdn Effect Vitest Tests 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 Wrdn Effect Vitest Tests safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Wrdn Effect Vitest Tests use?

Wrdn Effect Vitest Tests 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 Wrdn Effect Vitest Tests use?

About 203 tokens (SKILL.md is roughly 812 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 Wrdn Effect Vitest Tests?

Skills that share tags, products or a category with Wrdn Effect Vitest Tests: Test Writing Workflow (iOfficeAI/AionUi, 33k stars), Vitest (supabase/supabase, 111k stars), Test Guard (amElnagdy/guard-skills, 1.3k stars) and Adding LLM MCP Tools (TriliumNext/Trilium, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Wrdn Effect Vitest Tests?

UsefulSoftwareCo (a GitHub organization) maintains it in UsefulSoftwareCo/executor, which has 4,111 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 9, 2026.

Source: UsefulSoftwareCo/executor on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.