Control UI E2E
openclaw/openclaw
A skill your agent uses when designing, testing, fixing, or extending the OpenClaw Control UI GUI, including UI stress-test galleries with feedback inputs, Vitest + Playwright end-to-end checks…
REQUIRED and PRIMARY testing approach for packages/playground and packages/playground-ui.
Install Playground Msw Tests
$ npx skills add mastra-ai/mastra --skill playground-msw-tests -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mastra-ai/mastra playground-msw-tests --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/mastra-ai/mastra.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/playground-msw-tests .claude/skills/playground-msw-tests && 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 "playground-msw-tests" agent skill from https://github.com/mastra-ai/mastra/tree/main/.claude/skills/playground-msw-tests into .claude/skills/playground-msw-tests/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "playground-msw-tests", 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/mastra-ai/mastra/tree/main/.claude/skills/playground-msw-testsType 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 mastra-ai/mastra --skill playground-msw-tests -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mastra-ai/mastra playground-msw-tests --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mastra-ai/mastra.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/playground-msw-tests .agents/skills/playground-msw-tests && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "playground-msw-tests" agent skill from https://github.com/mastra-ai/mastra/tree/main/.claude/skills/playground-msw-tests into .agents/skills/playground-msw-tests/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "playground-msw-tests", 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 mastra-ai/mastra --skill playground-msw-tests -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mastra-ai/mastra playground-msw-tests --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mastra-ai/mastra.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/playground-msw-tests .cursor/skills/playground-msw-tests && 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 "playground-msw-tests" agent skill from https://github.com/mastra-ai/mastra/tree/main/.claude/skills/playground-msw-tests into .cursor/skills/playground-msw-tests/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "playground-msw-tests", 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/mastra-ai/mastra.git --path .claude/skills/playground-msw-tests--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 mastra-ai/mastra --skill playground-msw-tests -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mastra-ai/mastra playground-msw-tests --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mastra-ai/mastra.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/playground-msw-tests .gemini/skills/playground-msw-tests && 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 "playground-msw-tests" agent skill from https://github.com/mastra-ai/mastra/tree/main/.claude/skills/playground-msw-tests into .gemini/skills/playground-msw-tests/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "playground-msw-tests", 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 mastra-ai/mastra playground-msw-testsInstalls 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 mastra-ai/mastra --skill playground-msw-tests -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mastra-ai/mastra.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/playground-msw-tests .github/skills/playground-msw-tests && 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 "playground-msw-tests" agent skill from https://github.com/mastra-ai/mastra/tree/main/.claude/skills/playground-msw-tests into .github/skills/playground-msw-tests/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "playground-msw-tests", 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 mastra-ai/mastra --skill playground-msw-tests -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mastra-ai/mastra playground-msw-tests --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mastra-ai/mastra.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/playground-msw-tests .opencode/skills/playground-msw-tests && 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 "playground-msw-tests" agent skill from https://github.com/mastra-ai/mastra/tree/main/.claude/skills/playground-msw-tests into .opencode/skills/playground-msw-tests/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "playground-msw-tests", 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
playground-msw-tests- GitHub stars
- 29k
- Token cost
- ~2.6k tokens
- SKILL.md length
- 868 words
- Files
- 1
- Skills in repo
- 44
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
REQUIRED and PRIMARY testing approach for packages/playground and packages/playground-ui.
- Works in 3 steps: MSW + typed client-js fixtures (THIS… → Playwright E2E (e2e-tests-studio skill)… → Pure unit tests — only for…
- Modifying hooks
- SKILL.md covers Core Principle, Priority Order, What NOT to do and What TO do, plus 6 more sections
- Calls pnpm
What it does
Playground Msw Tests is an agent skill from mastra-ai/mastra. REQUIRED and PRIMARY testing approach for packages/playground and packages/playground-ui. Triggers on: adding or modifying hooks, pages, route components, data-fetching code, React Query interactions, or any test work in these packages. Generates Vitest tests that drive the real @mastra/client-js + React Query stack through MSW handlers and typed fixtures derived from @mastra/client-js response types. This is the 1 way to test the playground packages — ABOVE Playwright E2E. Use Playwright only for cross-page user…
Its SKILL.md is about 2.6k 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, Customer journey mapping and End-to-end testing. It works with Mastra, TanStack, Playwright and Vitest. The repository describes itself as: Mastra is the modern TypeScript framework for AI-powered applications and agents.
When your agent uses it
- Modifying hooks
- Route components
- Data-fetching code
- React Query interactions
Example prompts
- “/playground-msw-tests”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- MSW + typed client-js fixtures (THIS SKILL) — for hooks, pages, routes,
- Playwright E2E (e2e-tests-studio skill) — only for genuine cross-page
- Pure unit tests — only for self-contained utilities/services with no
What it can do on your machine
Read from SKILL.md and the folder at commit b98829a. 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
Links to these hosts (documentation or services it may open):
mswjs.io
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
Playground Msw Tests loads about 2.6k tokens when it runs. Until then it costs about 143 tokens; SKILL.md has 868 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 868 words (~2,563 tokens).
“Drive the real transport, mock the network.”
- name
- playground-msw-tests
Files
Just SKILL.md in .claude/skills/playground-msw-tests of mastra-ai/mastra.
Open the folder on GitHubat commit b98829a
Compare with similar skills
Playground Msw 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Playground Msw Tests this skillmastra-ai/mastra | 29k | — | ~2.6k | Automated safety check: Pass | Custom licence | |
| Control UI E2Eopenclaw/openclaw | 392k | — | ~2.9k | Automated safety check: Pass | MIT | |
| Svelte Testingspences10/sveltest | 113 | — | ~579 | Automated safety check: Pass | MIT | |
| Playwright Testingchongdashu/vibejam-starter-pack | 149 | — | ~2.1k | Automated safety check: Pass | None | |
| Ha Frontend Testinghome-assistant/frontend | 5.7k | — | ~1.7k | Automated safety check: Pass | Apache-2.0 | |
| Playwright Testingchongdashu/vibejam-starter-pack | 149 | — | ~2.2k | Automated safety check: Pass | None |
Similar skills
Svelte Testing
spences10/sveltest
Fix and create Svelte 5 tests with vitest-browser-svelte and Playwright.
Playwright Testing
chongdashu/vibejam-starter-pack
Plan, implement, and debug frontend tests: unit/integration/E2E/visual/a11y.
Ha Frontend Testing
home-assistant/frontend
Home Assistant frontend testing and validation workflow. An agent skill from home-assistant/frontend.
Playwright Testing
chongdashu/vibejam-starter-pack
Plan, implement, and debug frontend tests: unit/integration/E2E/visual/a11y.
Frontend Playwright E2E
ansible/ansible-ui
Write, run, and debug Playwright E2E / integration / live tests.
More from mastra-ai/mastra
All 44 skills in this repoDocs Audit
mastra-ai/mastra
Autonomous, report-only documentation review for Mastra docs.
Builder Smoke Test
mastra-ai/mastra
Smoke test the Agent Builder feature branch end-to-end against a hermetic project scaffolded by the skill (linked to the current worktree).
Mastra Smoke Test
mastra-ai/mastra
Smoke test Mastra projects locally or deploy to staging/production.
React Best Practices
mastra-ai/mastra
React performance optimization guidelines from Mastra Engineering.
Agent Prompt Quality Bar
mastra-ai/mastra
Universal quality bar and final audit rubric for any agent system prompt.
Coding Agent
mastra-ai/mastra
Authoring playbook for building agents that write, edit, review, or refactor code.
Related
Works with
Categories
Questions about Playground Msw Tests
What does Playground Msw Tests do?
REQUIRED and PRIMARY testing approach for packages/playground and packages/playground-ui. Playground Msw Tests is an agent skill from mastra-ai/mastra. REQUIRED and PRIMARY testing approach for packages/playground and packages/playground-ui.
When should I use Playground Msw Tests?
Playground Msw Tests fits situations like: modifying hooks; route components; data-fetching code; React Query interactions.
How do I install Playground Msw Tests in Claude Code?
Run `npx skills add mastra-ai/mastra --skill playground-msw-tests -a claude-code`. Or copy the skill folder (.claude/skills/playground-msw-tests in mastra-ai/mastra) into .claude/skills/playground-msw-tests in your project. Claude Code loads it when a task matches its description.
How do I install Playground Msw Tests in Codex?
Run `npx skills add mastra-ai/mastra --skill playground-msw-tests -a codex`. Or copy the skill folder (.claude/skills/playground-msw-tests in mastra-ai/mastra) into .agents/skills/playground-msw-tests in your project. Codex loads it when a task matches its description.
Can I use Playground Msw 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 mastra-ai/mastra --skill playground-msw-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/playground-msw-tests, .gemini/skills/playground-msw-tests, .github/skills/playground-msw-tests and .opencode/skills/playground-msw-tests in your project.
What does Playground Msw Tests need to run?
Going by SKILL.md and its folder, Playground Msw Tests needs the command-line tools its instructions call (pnpm).
Does Playground Msw Tests access the network?
SKILL.md names 1 domain. As links in the text: mswjs.io. This is read from the text; nothing was executed.
Is Playground Msw Tests 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 Playground Msw Tests use?
Playground Msw Tests 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 Playground Msw Tests use?
About 2.6k tokens (SKILL.md is roughly 10k 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 Playground Msw Tests?
Skills that share tags, products or a category with Playground Msw Tests: Control UI E2E (openclaw/openclaw, 392k stars), Svelte Testing (spences10/sveltest, 113 stars), Playwright Testing (chongdashu/vibejam-starter-pack, 149 stars) and Ha Frontend Testing (home-assistant/frontend, 5.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Playground Msw Tests?
mastra-ai (a GitHub organization) maintains it in mastra-ai/mastra, which has 28,698 GitHub stars. The repository holds 44 skills in this directory. The repository was last updated on October 11, 2026.
Source: mastra-ai/mastra on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.