Borrowing it
Nothing to install: this file belongs to wgarrido/mcp-browser. 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/wgarrido/mcp-browser/main/CLAUDE.mdgit clone --depth 1 https://github.com/wgarrido/mcp-browserWrote 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/wgarrido/mcp-browser/claude-md)<a href="https://agentmods.dev/instructions/wgarrido/mcp-browser/claude-md"><img src="https://agentmods.dev/badge/instructions/wgarrido/mcp-browser/claude-md.svg" alt="Measured on agentmods" 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 | $0.00148 | $0.00148 |
| Opus 5 | $0.00074 | $0.00074 |
| Sonnet 5 | $0.00030 | $0.00030 |
| Haiku 4.5 | $0.00015 | $0.00015 |
Grade A, and why
mcp-browser 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 7d 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.
What it actually says
Browser MCP Proxy
This project is an MCP server that routes web requests through Chrome via CDP.
Using browser-proxy tools
When asked to search the web or browse pages, prefer the browser-proxy MCP tools over built-in tools:
- Use
web_searchfor web searches, then always follow up withfetch_pageon the top results to read the actual content. - Use
fetch_pageorfetch_readableto read web pages. - Use
screenshotto capture visual snapshots of pages. - Use
multi_fetchwhen comparing multiple URLs.
The browser-proxy tools use the user's real Chrome browser with their cookies and sessions, which avoids anti-bot blocks.
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.
- 7d ago First seen · 14 lines · 148 tokens per session scan A 07a3d758d383
mcp-browser CLAUDE.md is an instructions file published in the GitHub repository wgarrido/mcp-browser (3 stars, last pushed 5mo ago), licensed MIT. It adds 148 tokens to every session, about $0.0007 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 2026-08-31.
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