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 brain-bootstrap/claude-code-brain-bootstrap --skill playwrightgit clone --depth 1 https://github.com/brain-bootstrap/claude-code-brain-bootstrapWrote 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/brain-bootstrap/claude-code-brain-bootstrap/playwright)<a href="https://agentmods.dev/skills/brain-bootstrap/claude-code-brain-bootstrap/playwright"><img src="https://agentmods.dev/badge/skills/brain-bootstrap/claude-code-brain-bootstrap/playwright/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/brain-bootstrap/claude-code-brain-bootstrap/playwright"><img src="https://agentmods.dev/badge/skills/brain-bootstrap/claude-code-brain-bootstrap/playwright.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00030 | $0.00693 |
| Opus 5.5 | $0.00012 | $0.00277 |
| Sonnet 5.5 | $0.00006 | $0.00139 |
| Haiku 4.5 | $0.00003 | $0.00069 |
Grade A, and why
playwright 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 1mo 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 — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Browser Automation with Playwright MCP
Use when: you need to interact with a web page — test a UI, scrape docs, verify a login flow, research a live API.
MCP server key: playwright — tools: mcp__playwright__*
Token cost: 🟡 LOW-MEDIUM — accessibility snapshots are structured text (no pixel cost); large pages produce verbose trees.
Decision matrix — when to use playwright vs other tools
| Task | Use |
|---|---|
| "Test this login form end-to-end" | playwright |
| "Scrape this documentation page" | playwright |
| "Verify OAuth redirect works" | playwright |
| "Find code about auth" | cocoindex-code (semantic search) |
| "What does AuthService call?" | codebase-memory-mcp (structural graph) |
| "Is this PR safe to ship?" | code-review-graph |
Core tools
mcp__playwright__browser_navigate(url) — go to URL
mcp__playwright__browser_snapshot() — accessibility tree (PREFER over screenshot)
mcp__playwright__browser_click(element, ref) — click by accessibility label
mcp__playwright__browser_fill(element, ref, val) — fill an input
mcp__playwright__browser_screenshot() — visual capture (only when structure is insufficient)
mcp__playwright__browser_evaluate(script) — run JS in page context
mcp__playwright__browser_wait_for_url(url) — wait for navigation
mcp__playwright__browser_close() — clean up when done
Standard workflow — snapshot first, screenshot never (unless needed)
1. browser_navigate(url)
2. browser_snapshot() ← read the accessibility tree
3. browser_click / browser_fill ← interact by element label or ref
4. browser_snapshot() ← verify the new state
5. browser_close() ← always clean up
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.
- 1mo ago First seen · 70 lines · 30 tokens per session scan A 6dde6da0f828
playwright is a skill published in the GitHub repository brain-bootstrap/claude-code-brain-bootstrap (11 stars, last pushed 5mo ago), licensed MIT. It adds 30 tokens to every session and 693 once invoked, about $0.0001 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 2026-09-03.
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