Playwright MCP is a Model Context Protocol server that lets language models control web browsers through Playwright and structured accessibility data instead of screenshots. Coding agents use it for browser automation and interaction with web pages.
Borrowing it
Nothing to install: this file belongs to microsoft/playwright-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/microsoft/playwright-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/microsoft/playwright-mcpWrote 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/instructions/microsoft/playwright-mcp/claude-md)<a href="https://agentmods.dev/instructions/microsoft/playwright-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/microsoft/playwright-mcp/claude-md/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/instructions/microsoft/playwright-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/microsoft/playwright-mcp/claude-md.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 | $0.00363 | $0.00363 |
| Opus 5.5 | $0.00145 | $0.00145 |
| Sonnet 5.5 | $0.00073 | $0.00073 |
| Haiku 4.5 | $0.00036 | $0.00036 |
Grade A, and why
playwright-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
5 near-identical copies found in the catalogue:
- Playwright-Mcp1 CLAUDE.md — 100% identical, 0 lines differ
- MCP_DOCS CLAUDE.md — 100% identical, 0 lines differ
- oss-playwright-mcp CLAUDE.md — 100% identical, 0 lines differ
- playwright-mcp-render-mt8x2ig6 CLAUDE.md — 100% identical, 0 lines differ
- MCP_docs CLAUDE.md — 100% identical, 0 lines differ
What it actually says
Commit Convention
Semantic commit messages: label(scope): description
Labels: fix, feat, chore, docs, test, devops
git checkout -b fix-39562
# ... make changes ...
git add <changed-files>
git commit -m "$(cat <<'EOF'
fix(proxy): handle SOCKS proxy authentication
Fixes: https://github.com/microsoft/playwright/issues/39562
EOF
)"
git push origin fix-39562
gh pr create --repo microsoft/playwright --head username:fix-39562 \
--title "fix(proxy): handle SOCKS proxy authentication" \
--body "$(cat <<'EOF'
## Summary
- <describe the change very! briefly>
Fixes https://github.com/microsoft/playwright/issues/39562
EOF
)"
Never add Co-Authored-By agents in commit message.
Branch naming for issue fixes: fix-<issue-number>
Rolling Playwright
- Run
node roll.js(ornpm run roll) to bumpplaywright,playwright-core, and@playwright/test, refreshconfig.d.ts, and regenerate the README. The script prints the resolved version — use its suffix for the branch name. - Create a branch:
git checkout -b roll-pw-<version-suffix>. - Run
npm test. Only proceed if all tests pass. - Commit with
chore: roll Playwright to <version>, push, and open a PR againstmicrosoft/playwright-mcpwith the same title.
Preparing a Release
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 · 42 lines · 363 tokens per session scan A e4cf26b7670c
playwright-mcp CLAUDE.md is an instructions file published in the GitHub repository microsoft/playwright-mcp (38,719 stars, last pushed 6d ago), licensed Apache-2.0. It adds 363 tokens to every session, about $0.0015 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.
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