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 agentmods add skills/microsoft/playwright/playwright-devnpx skills add microsoft/playwright --skill playwright-devgit clone --depth 1 https://github.com/microsoft/playwrightWhat 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 | $0.00025 | $0.00312 |
| Opus 5 | $0.00013 | $0.00156 |
| Sonnet 5 | $0.00005 | $0.00062 |
| Haiku 4.5 | $0.00003 | $0.00031 |
Grade A, and why
playwright-dev 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 yesterday.
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.
What it actually says
Playwright Development Guide
See CLAUDE.md for monorepo structure, build/test/lint commands, and coding conventions.
Detailed Guides
- Library Architecture — client/server/dispatcher structure, protocol layer, DEPS rules
- Adding and Modifying APIs — define API docs, implement client/server, add tests
- MCP Tools and CLI Commands — add MCP tools, CLI commands, config options
- Vendor Dependencies & Bundling — utilsBundle, coreBundle, babelBundle; adding vendored npm packages; DEPS.list;
check_deps - Updating WebKit Safari Version — update the Safari version string in the WebKit user-agent
- WebView (iOS Safari) Backend —
webkit/webview/against stock Mobile Safari; provisional-target pause/resume; what's upstream vs Playwright patches; local + CI test setup - Bisecting Across Published Versions — reproduce regressions side-by-side from npm and diff
node_modules/playwright/lib/between versions - Dashboard - the UI powering the "playwright cli show" command, and how to work on it
What ships with it
9 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.
- yesterday First seen · 20 lines · 25 tokens per session scan A 6771c8148b53
playwright-dev is a skill published in the GitHub repository microsoft/playwright (95,378 stars, last pushed 3d ago), licensed Apache-2.0. It adds 25 tokens to every session and 312 once invoked, about $0.0001 per session on Opus 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.
Other skills, from other repositories
glance-test
Run E2E browser tests on any web application using Glance MCP. Use when the user says "test this page," "check this URL," "run E2E tests," "browser test," "test the login flow," "check if the site works," "visual regression," or "screenshot this page." Also use for post-deploy verification and smoke tests.
qa-explore
Exploratory end-to-end QA with a team of agents that drive a real browser like human testers — they click through the whole app, create/fill/submit, screenshot and visually judge rendering + data correctness, capture trace/HAR/console/video evidence, adversarially verify each finding, learn from rejected findings, and…
qa-plan
Risk-based test plan — what a senior QA team writes BEFORE testing. Recon the app, score each area by RISK (impact × likelihood), rank into P0/P1/P2 deterministically, define the acceptance ("done") per area, and emit a test charter (Markdown) that also seeds qa-explore's areas in priority order so the expensive…
compiler
Use when converting a refined markdown E2E test case into a standard Playwright .spec.ts file. Triggers on "compile this test", "convert to playwright", or "generate spec from markdown". Requires a stable markdown test case and a running dev server.
author
Use when writing a new E2E browser test from a vague user description or feature requirement. Turns exploratory browser sessions into structured, reusable test cases.
refiner
Use when an E2E test case exists but needs stabilization through repeated execution. Runs the test multiple times, identifies flaky steps, and updates the test case and conventions until deterministic.