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Agent skill

E2E Tests Studio

by mastra-ai in mastra-ai/mastra

REQUIRED when modifying any file in packages/playground-ui or packages/playground.

Custom licenceAuto-check passedTesting & QA

Install E2E Tests Studio

skills CLI
$ npx skills add mastra-ai/mastra --skill e2e-tests-studio -a claude-code

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

GitHub CLI
$ gh skill install mastra-ai/mastra e2e-tests-studio --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/mastra-ai/mastra.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/e2e-tests-studio .claude/skills/e2e-tests-studio && 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
e2e-tests-studio
GitHub stars
29k
Token cost
~4.3k tokens
SKILL.md length
820 words
Files
1
Skills in repo
44
Repo updated
First seen
Licence
Custom licence

At a glance

REQUIRED when modifying any file in packages/playground-ui or packages/playground.

  • Works in 7 steps: Understand the Feature Intent → Build and Start → Map Feature to Behavior Tests → …
  • : React component creation/modification/refactoring
  • SKILL.md covers Core Principle: Test Product…, BDD Structure (REQUIRED), Prerequisites and Step 1: Understand the Feature…, plus 8 more sections
  • Calls pnpm and claude

What it does

E2E Tests Studio is an agent skill from mastra-ai/mastra. REQUIRED when modifying any file in packages/playground-ui or packages/playground. Triggers on: React component creation/modification/refactoring, UI changes, new playground features, bug fixes affecting studio UI. Generates Playwright E2E tests that validate PRODUCT BEHAVIOR, not just UI states.

Its SKILL.md is about 4.3k 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 End-to-end testing, Debugging and React components. It works with Playwright. The repository describes itself as: Mastra is the modern TypeScript framework for AI-powered applications and agents.

When your agent uses it

  • : React component creation/modification/refactoring
  • New playground features
  • Bug fixes affecting studio UI

Example prompts

  • “/e2e-tests-studio”

Requirements

  • Node.js

Workflow steps

7 steps, taken from the step headings in SKILL.md.

  1. Understand the Feature Intent
  2. Build and Start
  3. Map Feature to Behavior Tests
  4. Write Behavior-Focused Tests
  5. Update Existing Tests
  6. Kitchen-Sink Fixtures for Behavior Testing
  7. Run and Validate

What it can do on your machine

Read from SKILL.md and the folder at commit fecbeda. 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
    • claude

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use pnpm, which can reach the network depending on how they are called.

    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

E2E Tests Studio loads about 4.3k tokens when it runs. Until then it costs about 79 tokens; SKILL.md has 820 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~79
When it runs · the whole SKILL.md, loaded when a task matches
~4.3k

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 820 words (~4,316 tokens).

“CRITICAL: Tests must verify that product features WORK correctly, not just that UI elements render.”

— opening of SKILL.md by mastra-ai, Custom licence
name
e2e-tests-studio
model
claude-opus-4-5

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/e2e-tests-studio of mastra-ai/mastra.

Open the folder on GitHubat commit fecbeda

Compare with similar skills

E2E Tests Studio 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.

E2E Tests Studio compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
E2E Tests Studio this skillmastra-ai/mastra29k—~4.3kAutomated safety check: PassCustom licence
E2Esendou-ink/sendou.ink297—~2.1kAutomated safety check: NotesAGPL-3.0
Tanstack Startasmyshlyaev177/test-proxy-recorder78—~2.9kAutomated safety check: NotesMIT
Replica TestJakeschincariol/replica-skill1.4k—~819Automated safety check: PassMIT
React Testingaffaan-m/ECC276k1 repos~3.3kAutomated safety check: PassMIT
Writing Playwright TestsComfy-Org/ComfyUI_frontend2.1k—~2.3kAutomated safety check: PassGPL-3.0

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Works with

Categories

Questions about E2E Tests Studio

What does E2E Tests Studio do?

REQUIRED when modifying any file in packages/playground-ui or packages/playground. E2E Tests Studio is an agent skill from mastra-ai/mastra. REQUIRED when modifying any file in packages/playground-ui or packages/playground.

When should I use E2E Tests Studio?

E2E Tests Studio fits situations like: : React component creation/modification/refactoring; new playground features; bug fixes affecting studio UI.

How do I install E2E Tests Studio in Claude Code?

Run `npx skills add mastra-ai/mastra --skill e2e-tests-studio -a claude-code`. Or copy the skill folder (.claude/skills/e2e-tests-studio in mastra-ai/mastra) into .claude/skills/e2e-tests-studio in your project. Claude Code loads it when a task matches its description.

How do I install E2E Tests Studio in Codex?

Run `npx skills add mastra-ai/mastra --skill e2e-tests-studio -a codex`. Or copy the skill folder (.claude/skills/e2e-tests-studio in mastra-ai/mastra) into .agents/skills/e2e-tests-studio in your project. Codex loads it when a task matches its description.

Can I use E2E Tests Studio 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 e2e-tests-studio -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/e2e-tests-studio, .gemini/skills/e2e-tests-studio, .github/skills/e2e-tests-studio and .opencode/skills/e2e-tests-studio in your project.

What does E2E Tests Studio need to run?

Going by SKILL.md and its folder, E2E Tests Studio needs the command-line tools its instructions call (pnpm and claude). Our summary lists: Node.js.

Does E2E Tests Studio 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 E2E Tests Studio 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 E2E Tests Studio use?

E2E Tests Studio 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 E2E Tests Studio use?

About 4.3k tokens (SKILL.md is roughly 17k 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 E2E Tests Studio?

Skills that share tags, products or a category with E2E Tests Studio: E2E (sendou-ink/sendou.ink, 297 stars), Tanstack Start (asmyshlyaev177/test-proxy-recorder, 78 stars), Replica Test (Jakeschincariol/replica-skill, 1.4k stars) and React Testing (affaan-m/ECC, 276k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains E2E Tests Studio?

mastra-ai (a GitHub organization) maintains it in mastra-ai/mastra, which has 28,674 GitHub stars. The repository holds 44 skills in this directory. The repository was last updated on October 10, 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.