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.
CPU-profile or leak-detect an existing vitest suite via env-gated instrumentation — DXPROFILETESTS emits a V8 .cpuprofile, DXDEBUGLEAKS writes before/after heap snapshots plus a per-test heapUsed…
Install Test Perf Leaks
$ npx skills add dxos/dxos --skill test-perf-leaks -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install dxos/dxos test-perf-leaks --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/dxos/dxos.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/test-perf-leaks .claude/skills/test-perf-leaks && 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-perf-leaks" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/test-perf-leaks into .claude/skills/test-perf-leaks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-perf-leaks", 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/dxos/dxos/tree/main/.agents/skills/test-perf-leaksType 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 dxos/dxos --skill test-perf-leaks -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install dxos/dxos test-perf-leaks --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/test-perf-leaks .agents/skills/test-perf-leaks && 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-perf-leaks" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/test-perf-leaks into .agents/skills/test-perf-leaks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-perf-leaks", 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 dxos/dxos --skill test-perf-leaks -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install dxos/dxos test-perf-leaks --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/test-perf-leaks .cursor/skills/test-perf-leaks && 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-perf-leaks" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/test-perf-leaks into .cursor/skills/test-perf-leaks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-perf-leaks", 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/dxos/dxos.git --path .agents/skills/test-perf-leaks--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 dxos/dxos --skill test-perf-leaks -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install dxos/dxos test-perf-leaks --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/test-perf-leaks .gemini/skills/test-perf-leaks && 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-perf-leaks" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/test-perf-leaks into .gemini/skills/test-perf-leaks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-perf-leaks", 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 dxos/dxos test-perf-leaksInstalls 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 dxos/dxos --skill test-perf-leaks -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/test-perf-leaks .github/skills/test-perf-leaks && 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-perf-leaks" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/test-perf-leaks into .github/skills/test-perf-leaks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-perf-leaks", 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 dxos/dxos --skill test-perf-leaks -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install dxos/dxos test-perf-leaks --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/test-perf-leaks .opencode/skills/test-perf-leaks && 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-perf-leaks" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/test-perf-leaks into .opencode/skills/test-perf-leaks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-perf-leaks", 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-perf-leaks- GitHub stars
- 525
- Token cost
- ~1.4k tokens
- SKILL.md length
- 631 words
- Files
- 1
- Skills in repo
- 41
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
CPU-profile or leak-detect an existing vitest suite via env-gated instrumentation — DXPROFILETESTS emits a V8 .cpuprofile, DXDEBUGLEAKS writes before/after heap snapshots plus a per-test heapUsed…
- Works in 3 steps: Slope first. heap-samples.ndjson has one… → Then the diff. Load before.heapsnapshot… → Amplification comes from the suite's own…
- A suite is slow
- SKILL.md covers Run it, Read the CPU profile, Read the leak snapshots and Triage, plus 2 more sections
- Calls bash
What it does
Test Perf Leaks is an agent skill from dxos/dxos. CPU-profile or leak-detect an existing vitest suite via env-gated instrumentation — DXPROFILETESTS emits a V8 .cpuprofile, DXDEBUGLEAKS writes before/after heap snapshots plus a per-test heapUsed slope, with zero edits to the test file. Use when a suite is slow, memory grows across a run, or you need to find a hotspot/leak in node tests (echo/halo/mesh/sdk/composer/compute, incl. assistant + agentService).
Its SKILL.md is about 1.4k 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: TypeScript implementation of the DXOS protocols, SDK, toolchain and Composer.
When your agent uses it
- A suite is slow
- Memory grows across a run
- You need to find a hotspot/leak in node tests (echo/halo/mesh/sdk/composer/compute
Example prompts
- “/test-perf-leaks”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Slope first. heap-samples.ndjson has one {test, heapUsed} line per test, taken
- Then the diff. Load before.heapsnapshot and after.heapsnapshot in **DevTools →
- Amplification comes from the suite's own test count (vitest 4 dropped config repeats),
What it can do on your machine
Read from SKILL.md and the folder at commit 2e6b92a. 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:
bash
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):
speedscope.app
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 Perf Leaks loads about 1.4k tokens when it runs. Until then it costs about 107 tokens; SKILL.md has 631 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 631 words (~1,412 tokens).
“Two opt-in env vars instrument the shared node vitest project (createNodeProject in vite.base.config.ts). Unset → the config is byte-identical to a normal run, so CI and everyday runs are unaffected. You point them at an existing suite; nothing in the…”
- name
- test-perf-leaks
Files
Just SKILL.md in .agents/skills/test-perf-leaks of dxos/dxos.
Open the folder on GitHubat commit 2e6b92a
Compare with similar skills
Test Perf Leaks 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 Perf Leaks this skilldxos/dxos | 525 | — | ~1.4k | Automated safety check: Pass | Custom licence | |
| Test Writing WorkflowiOfficeAI/AionUi | 33k | 1 repos | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Vitestsupabase/supabase | 111k | 12 repos | ~1.1k | 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 |
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Related
Works with
Categories
Questions about Test Perf Leaks
What does Test Perf Leaks do?
CPU-profile or leak-detect an existing vitest suite via env-gated instrumentation — DXPROFILETESTS emits a V8 .cpuprofile, DXDEBUGLEAKS writes before/after heap snapshots plus a per-test heapUsed…. Test Perf Leaks is an agent skill from dxos/dxos.cpuprofile, DXDEBUGLEAKS writes before/after heap snapshots plus a per-test heapUsed slope, with zero edits to the test file.
When should I use Test Perf Leaks?
Test Perf Leaks fits situations like: A suite is slow; memory grows across a run; you need to find a hotspot/leak in node tests (echo/halo/mesh/sdk/composer/compute.
How do I install Test Perf Leaks in Claude Code?
Run `npx skills add dxos/dxos --skill test-perf-leaks -a claude-code`. Or copy the skill folder (.agents/skills/test-perf-leaks in dxos/dxos) into .claude/skills/test-perf-leaks in your project. Claude Code loads it when a task matches its description.
How do I install Test Perf Leaks in Codex?
Run `npx skills add dxos/dxos --skill test-perf-leaks -a codex`. Or copy the skill folder (.agents/skills/test-perf-leaks in dxos/dxos) into .agents/skills/test-perf-leaks in your project. Codex loads it when a task matches its description.
Can I use Test Perf Leaks 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 dxos/dxos --skill test-perf-leaks -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-perf-leaks, .gemini/skills/test-perf-leaks, .github/skills/test-perf-leaks and .opencode/skills/test-perf-leaks in your project.
What does Test Perf Leaks need to run?
Going by SKILL.md and its folder, Test Perf Leaks needs the command-line tools its instructions call (bash).
Does Test Perf Leaks access the network?
SKILL.md names 1 domain. As links in the text: speedscope.app. This is read from the text; nothing was executed.
Is Test Perf Leaks 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 Perf Leaks use?
Test Perf Leaks 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 Test Perf Leaks use?
About 1.4k tokens (SKILL.md is roughly 5.6k 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 Perf Leaks?
Skills that share tags, products or a category with Test Perf Leaks: 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 Test Perf Leaks?
dxos (a GitHub organization) maintains it in dxos/dxos, which has 525 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 9, 2026.
Source: dxos/dxos on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.