Agent skill

Testing

Decide whether committed tests are warranted, design regression tests, or follow explicitly requested TDD.

MITAuto-check passedTesting & QA

Install Testing

skills CLI

$ npx skills add danieljvdm/effect-cf --skill testing -a claude-code

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

GitHub CLI

$ gh skill install danieljvdm/effect-cf testing --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/danieljvdm/effect-cf.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/testing .claude/skills/testing && 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/

Paste into Claude Code

Install the "testing" agent skill from https://github.com/danieljvdm/effect-cf/tree/main/.agents/skills/testing into .claude/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", 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

$skill-installer install https://github.com/danieljvdm/effect-cf/tree/main/.agents/skills/testing

Type 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.

skills CLI

$ npx skills add danieljvdm/effect-cf --skill testing -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install danieljvdm/effect-cf testing --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danieljvdm/effect-cf.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/testing .agents/skills/testing && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "testing" agent skill from https://github.com/danieljvdm/effect-cf/tree/main/.agents/skills/testing into .agents/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", 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.

skills CLI

$ npx skills add danieljvdm/effect-cf --skill testing -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install danieljvdm/effect-cf testing --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danieljvdm/effect-cf.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/testing .cursor/skills/testing && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "testing" agent skill from https://github.com/danieljvdm/effect-cf/tree/main/.agents/skills/testing into .cursor/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", 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

$ gemini skills install https://github.com/danieljvdm/effect-cf.git --path .agents/skills/testing

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add danieljvdm/effect-cf --skill testing -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install danieljvdm/effect-cf testing --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danieljvdm/effect-cf.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/testing .gemini/skills/testing && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "testing" agent skill from https://github.com/danieljvdm/effect-cf/tree/main/.agents/skills/testing into .gemini/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", 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.

GitHub CLI

$ gh skill install danieljvdm/effect-cf testing

Installs 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).

skills CLI

$ npx skills add danieljvdm/effect-cf --skill testing -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/danieljvdm/effect-cf.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/testing .github/skills/testing && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "testing" agent skill from https://github.com/danieljvdm/effect-cf/tree/main/.agents/skills/testing into .github/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", 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.

skills CLI

$ npx skills add danieljvdm/effect-cf --skill testing -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install danieljvdm/effect-cf testing --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/danieljvdm/effect-cf.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/testing .opencode/skills/testing && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "testing" agent skill from https://github.com/danieljvdm/effect-cf/tree/main/.agents/skills/testing into .opencode/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", 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: testing
GitHub stars: 111
Token cost: ~248 tokens
SKILL.md length: 104 words
Files: 8 (incl. references)
Skills in repo: 6
Repo updated: Oct 4, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Decide whether committed tests are warranted, design regression tests, or follow explicitly requested TDD.

Tasks that involve Test-driven development
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Testing is an agent skill from danieljvdm/effect-cf. Decide whether committed tests are warranted, design regression tests, or follow explicitly requested TDD.

Its SKILL.md is about 250 tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files, including reference files (for example `.dev-kit-origin.json`, `agents/openai.yaml` and `references/selection.md`).

It sits in Testing & QA, covering Test-driven development. The repository describes itself as: Effect-native primitives for Cloudflare Workers and bindings. The licence is MIT.

When your agent uses it

Tasks that involve Test-driven development

Example prompts

“/testing”

What it can do on your machine

Read from SKILL.md and the folder at commit 0877e66. 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

Testing loads about 248 tokens when it runs, and up to ~1k if it reads all its reference files. Until then it costs about 29 tokens; SKILL.md has 104 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~29
When it runs · the whole SKILL.md, loaded when a task matches: ~248
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~1k

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 danieljvdm/effect-cf at commit 0877e66, republished under its MIT licence (© danieljvdm). 104 words, ~248 tokens.

Download SKILL.mdSave it as .claude/skills/testing/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.

name: testing
description: Decide whether committed tests are warranted, design regression tests, or follow explicitly requested TDD.
license: MIT

Testing

Follow the repository's testing policy and the user's requested scope. Adding source code does not by itself justify committed tests. Prefer the cheapest verification that proves the changed behavior.

Whether to add, retain, or remove a test: test selection.
A test boundary, substitute, or mocking decision: test design.
An explicit TDD, red-green, or test-first request: TDD. Ordinary feature verification does not require this workflow.

Honor an explicit testing request within its scope. Express expectations independently of implementation, exercise a stable public boundary, and follow repository evidence and placement rules. Keep the final suite green.

TDD attribution is in NOTICE; terms are in LICENSE.

Files

SKILL.md and 7 other files (references) in .agents/skills/testing of danieljvdm/effect-cf.

SKILL.md
.dev-kit-origin.json
LICENSE
NOTICE
agents/openai.yaml
references/selection.md
references/tdd.md
references/test-design.md

Open the folder on GitHubat commit 0877e66

Compare with similar skills

Testing 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.

Testing compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Testing this skilldanieljvdm/effect-cf	111	—	~248	Automated safety check: Pass	MIT	3 days ago
TDDfossasia/eventyay-interpretation	1.6k	28 repos	~1.1k	Automated safety check: Pass	Apache-2.0	2 days ago
TDD WorkflowhellangleZ/burn-in-cceverywhere-ralph	112	11 repos	~2.4k	Automated safety check: Pass	None	8 mo ago
TDDsanity-io/sanity	6.4k	20 repos	~1k	Automated safety check: Pass	MIT	today
Test Driven Developmentfarm-fe/farm	5.6k	49 repos	~2.5k	Automated safety check: Pass	MIT	15 days ago
Tapd Story PipelineTencentBlueKing/bk-bcs	840	—	~2.6k	Automated safety check: Pass	Custom licence	13 days ago

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Questions about Testing

What does Testing do?

Decide whether committed tests are warranted, design regression tests, or follow explicitly requested TDD. Testing is an agent skill from danieljvdm/effect-cf. Decide whether committed tests are warranted, design regression tests, or follow explicitly requested TDD.

When should I use Testing?

Testing fits situations like: tasks that involve Test-driven development.

How do I install Testing in Claude Code?

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

How do I install Testing in Codex?

Run `npx skills add danieljvdm/effect-cf --skill testing -a codex`. Or copy the skill folder (.agents/skills/testing in danieljvdm/effect-cf) into .agents/skills/testing in your project. Codex loads it when a task matches its description.

Can I use Testing 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 danieljvdm/effect-cf --skill testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/testing, .gemini/skills/testing, .github/skills/testing and .opencode/skills/testing in your project.

What does Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Testing is instructions for the agent only.

Does Testing 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 Testing 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 Testing use?

Testing is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Testing use?

About 248 tokens (SKILL.md is roughly 992 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 771 tokens, read only when the agent opens those files.

What are the alternatives to Testing?

Skills that share tags, products or a category with Testing: TDD (fossasia/eventyay-interpretation, 1.6k stars), TDD Workflow (hellangleZ/burn-in-cceverywhere-ralph, 112 stars), TDD (sanity-io/sanity, 6.4k stars) and Test Driven Development (farm-fe/farm, 5.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Testing?

danieljvdm (a GitHub user) maintains it in danieljvdm/effect-cf, which has 111 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 4, 2026.

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

Testing

Install Testing

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Testing

Files

Compare with similar skills

Similar skills

TDD

TDD Workflow

TDD

Test Driven Development

Tapd Story Pipeline

Absolute Init

More from danieljvdm/effect-cf

PR Hygiene

Cloudflare Workers

Dev Kit

Effect Development

Open Pull Request

Questions about Testing

Install Testing

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Testing

Files

Compare with similar skills

Similar skills

More from danieljvdm/effect-cf

Related

Questions about Testing