Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add web-infra-dev/midscene-skills --skill vitest-midscene-e2egit clone --depth 1 https://github.com/web-infra-dev/midscene-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/web-infra-dev/midscene-skills/vitest-midscene-e2e)<a href="https://agentmods.dev/skills/web-infra-dev/midscene-skills/vitest-midscene-e2e"><img src="https://agentmods.dev/badge/skills/web-infra-dev/midscene-skills/vitest-midscene-e2e/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/web-infra-dev/midscene-skills/vitest-midscene-e2e"><img src="https://agentmods.dev/badge/skills/web-infra-dev/midscene-skills/vitest-midscene-e2e.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00139 | $0.01762 |
| Opus 5.5 | $0.00056 | $0.00705 |
| Sonnet 5.5 | $0.00028 | $0.00352 |
| Haiku 4.5 | $0.00014 | $0.00176 |
Grade A, and why
vitest-midscene-e2e scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vitest Midscene E2E
Modules
| Module | Role |
|---|---|
| Vitest | TypeScript test framework. Provides describe/it/expect/hooks for test organization, assertions, and lifecycle. |
| Midscene | AI-driven UI automation. Interacts with UI elements via natural language — no fragile selectors. Core API: aiAct. |
Supported platforms:
- Web —
WebTest(Playwright Chromium):ctx.agent+ctx.page - Android —
AndroidTest(ADB + scrcpy):ctx.agentonly - iOS —
IOSTest(WebDriverAgent):ctx.agentonly
Workflow
Step 1: Clone boilerplate & ensure project ready
bash scripts/clone-boilerplate.sh
The boilerplate at ~/.midscene/boilerplate/vitest-all-platforms-demo/ is the canonical reference for project structure, configs, platform context classes, and test conventions. Compare the current project against it. If anything is missing, ask the user which platform(s) they need (Web / Android / iOS), then fill in what's missing using the boilerplate as the target state. Only include files for the requested platform(s). Do NOT overwrite existing configs or files. Copy .env.example from the boilerplate as .env if it doesn't exist, and prompt the user to fill in the env vars.
Step 2: Read the Midscene Agent API section below before writing tests
It contains mandatory rules for using aiAct — the primary API for all UI operations. Do NOT skip this step.
Step 3: Create, update, or run tests
Use the boilerplate's e2e/ directory and src/context/ as reference for patterns and conventions. Before running tests, ensure dependencies are installed and .env is configured. When debugging failures, check troubleshooting.md.
Midscene Agent API
ctx.agent is a platform-specific agent instance. All methods return Promises.
- Web:
PlaywrightAgentfrom@midscene/web/playwright - Android:
AndroidAgentfrom@midscene/android - iOS:
IOSAgentfrom@midscene/ios
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 139 lines · 139 tokens per session scan A 2a25ace7d193
vitest-midscene-e2e is a skill published in the GitHub repository web-infra-dev/midscene-skills (319 stars, last pushed yesterday), licensed MIT. It adds 139 tokens to every session and 1,762 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
vitest-midscene-e2e compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| vitest-midscene-e2eweb-infra-dev/midscene-skills | Skill | 319 | yesterday | MIT | A | 139 | Claude Code |
| browsegarrytan/gstack | Skill | 140k | yesterday | MIT | B | 32 | Claude Code |
| cua-driverdavidondrej/skills | Skill | 4.3k | 3d ago | MIT | A | 68 | Claude Code, Codex |
| create-verification-skillget-bb/bb | Skill | 4.9k | today | MIT | A | 57 | Claude Code, Codex |
| browser-qahashgraph-online/awesome-codex-plugins | Skill | 1.5k | yesterday | Apache-2.0 | A | 58 | Claude Code, Codex |
| webapp-testinganthropics/skills | Skill | 188k | 9d ago | none | A | 35 | Claude Code |
| test-electron-appPostHog/posthog-foss | Skill | 728 | yesterday | MIT | A | 112 | Claude Code |