Ecc Conventions
affaan-m/ECC
Development conventions and patterns for ECC. An agent skill from affaan-m/ECC.
Apply Epicenter test-file conventions for setup, factories, Result assertions, type tests, naming, and pruning.
Custom licenceAuto-check passed
Install Testing
$ npx skills add EpicenterHQ/epicenter --skill testing -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install EpicenterHQ/epicenter testing --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/EpicenterHQ/epicenter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/testing .claude/skills/testing && 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 "testing" agent skill from https://github.com/EpicenterHQ/epicenter/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 install https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/testingType 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 EpicenterHQ/epicenter --skill testing -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install EpicenterHQ/epicenter testing --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/testing .agents/skills/testing && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "testing" agent skill from https://github.com/EpicenterHQ/epicenter/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.
$ npx skills add EpicenterHQ/epicenter --skill testing -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install EpicenterHQ/epicenter testing --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/testing .cursor/skills/testing && 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 "testing" agent skill from https://github.com/EpicenterHQ/epicenter/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 https://github.com/EpicenterHQ/epicenter.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.
$ npx skills add EpicenterHQ/epicenter --skill testing -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install EpicenterHQ/epicenter testing --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/testing .gemini/skills/testing && 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 "testing" agent skill from https://github.com/EpicenterHQ/epicenter/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.
$ gh skill install EpicenterHQ/epicenter testingInstalls 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 EpicenterHQ/epicenter --skill testing -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/testing .github/skills/testing && 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 "testing" agent skill from https://github.com/EpicenterHQ/epicenter/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.
$ npx skills add EpicenterHQ/epicenter --skill testing -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install EpicenterHQ/epicenter testing --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/testing .opencode/skills/testing && 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 "testing" agent skill from https://github.com/EpicenterHQ/epicenter/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
- 4.8k
- Token cost
- ~1.8k tokens
- SKILL.md length
- 535 words
- Files
- 6 (incl. references)
- Skills in repo
- 65
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Apply Epicenter test-file conventions for setup, factories, Result assertions, type tests, naming, and pruning.
- Works in 3 steps: State what happens, not "should work" or… → Include the condition when testing edge… → No filler words: "should", "correctly",…
- Reorganizing tests
- SKILL.md covers References, Result Assertions, Tests vs. Benchmarks and File-Level Doc Comments, plus 2 more sections
- Calls bun
What it does
Testing is an agent skill from EpicenterHQ/epicenter. Apply Epicenter test-file conventions for setup, factories, Result assertions, type tests, naming, and pruning. Use when writing, reviewing, deleting, or reorganizing tests, especially .test.ts files.
Its SKILL.md is about 1.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `references/honest-tests.md`, `references/setup-pattern.md` and `references/test-deletion-grill.md`).
The repository describes itself as: Open-source, local-first apps.
When your agent uses it
- Reorganizing tests
- Especially .test.ts files
Example prompts
- “/testing”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- State what happens, not "should work" or "handles correctly"
- Include the condition when testing edge cases
- No filler words: "should", "correctly", "properly" add nothing
What it can do on your machine
Read from SKILL.md and the folder at commit 9cc65c3. 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:
bun
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
kentcdodds.comtestingjavascript.comtotaltypescript.comgithub.com
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 1.8k tokens when it runs, and up to ~7.8k if it reads all its reference files. Until then it costs about 53 tokens; SKILL.md has 535 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 535 words (~1,834 tokens).
“Load these on demand based on what you're working on:”
- name
- testing
- metadata.author
- epicenter
- metadata.version
- 2.0
Files
SKILL.md and 5 other files (references) in .agents/skills/testing of EpicenterHQ/epicenter.
- SKILL.md
- references/honest-tests.md
- references/setup-pattern.md
- references/test-deletion-grill.md
- references/test-structure.md
- references/type-testing.md
Open the folder on GitHubat commit 9cc65c3
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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Testing this skillEpicenterHQ/epicenter | 4.8k | — | ~1.8k | Automated safety check: Pass | Custom licence | |
| Ecc Conventionsaffaan-m/ECC | 275k | — | ~2.8k | Automated safety check: Pass | MIT | |
| Factory MCPwarpdotdev/warp | 65k | 1 repos | ~237 | Automated safety check: Pass | AGPL-3.0 | |
| Warp Factory Fileswarpdotdev/warp | 65k | 1 repos | ~2.5k | Automated safety check: Pass | AGPL-3.0 | |
| Factorial AutomationComposioHQ/awesome-claude-skills | 77k | 3 repos | ~738 | Automated safety check: Pass | None | |
| Naming Conventionsthedaviddias/Front-End-Checklist | 74k | — | ~481 | Automated safety check: Pass | MIT |
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Questions about Testing
What does Testing do?
Apply Epicenter test-file conventions for setup, factories, Result assertions, type tests, naming, and pruning. Testing is an agent skill from EpicenterHQ/epicenter. Apply Epicenter test-file conventions for setup, factories, Result assertions, type tests, naming, and pruning.
When should I use Testing?
Testing fits situations like: reorganizing tests; especially .test.ts files.
How do I install Testing in Claude Code?
Run `npx skills add EpicenterHQ/epicenter --skill testing -a claude-code`. Or copy the skill folder (.agents/skills/testing in EpicenterHQ/epicenter) 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 EpicenterHQ/epicenter --skill testing -a codex`. Or copy the skill folder (.agents/skills/testing in EpicenterHQ/epicenter) 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 EpicenterHQ/epicenter --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?
Going by SKILL.md and its folder, Testing needs the command-line tools its instructions call (bun).
Does Testing access the network?
SKILL.md names 4 domains. As links in the text: kentcdodds.com, testingjavascript.com, totaltypescript.com and github.com. 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 has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Testing use?
About 1.8k tokens (SKILL.md is roughly 7.3k 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 5.9k 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: Ecc Conventions (affaan-m/ECC, 275k stars), Factory MCP (warpdotdev/warp, 65k stars), Warp Factory Files (warpdotdev/warp, 65k stars) and Factorial Automation (ComposioHQ/awesome-claude-skills, 77k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Testing?
EpicenterHQ (a GitHub organization) maintains it in EpicenterHQ/epicenter, which has 4,819 GitHub stars. The repository holds 65 skills in this directory. The repository was last updated on October 8, 2026.
Source: EpicenterHQ/epicenter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.