Stealth Browser MCP is a browser-automation server that lets MCP-compatible AI agents control real Chrome-family browser instances and interact with sites protected by challenges, anti-bot checks, or login walls. It is for automating browsing, inspecting network traffic, and cloning or examining web interfaces through agent commands.
Borrowing it
Nothing to install: this file belongs to vibheksoni/stealth-browser-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/vibheksoni/stealth-browser-mcp/master/AGENTS.mdgit clone --depth 1 https://github.com/vibheksoni/stealth-browser-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/vibheksoni/stealth-browser-mcp/agents-md)<a href="https://agentmods.dev/instructions/vibheksoni/stealth-browser-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/vibheksoni/stealth-browser-mcp/agents-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/vibheksoni/stealth-browser-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/vibheksoni/stealth-browser-mcp/agents-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 | $0.00985 | $0.00985 |
| Opus 5.5 | $0.00394 | $0.00394 |
| Sonnet 5.5 | $0.00197 | $0.00197 |
| Haiku 4.5 | $0.00098 | $0.00098 |
Grade A, and why
stealth-browser-mcp AGENTS.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 today.
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 — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Instructions
Start Here
Read README.md first for project overview, features, and setup.
- Repository: https://github.com/vibheksoni/stealth-browser-mcp
- Language: Python 3.10+
- Framework: FastMCP + nodriver (Chrome DevTools Protocol)
- Platform: Windows, macOS, Linux
Recommended Proxy Services
This project is sponsored by:
- NodeMaven — The most efficient proxy provider for Web Scraping and Automation with the Highest Quality IP on the market. Features: ZIP targeting, 99.9% uptime, IP filtering (fraud score <97%), no KYC, free tools (Proxy Bandwidth Checker, Meta Tag Checker, IP Lookup). Use discount code
STEALTHMCP35for 35% off Mobile and Residential Proxies orSTEALTHMCP40for 40% off ISP (Static) Proxies.
Environment
- Use the repo virtual environment:
- Python:
venv\Scripts\python.exe - Pip:
venv\Scripts\pip.exe
- Python:
- Platform: Windows 11 with PowerShell. Prefer PowerShell-native commands.
- Run Python from repo root:
& .\venv\Scripts\python.exe ...
Layout
- Server code is the
stealth_browser_mcppackage insrc/stealth_browser_mcp/. Modules import each other with relative imports (from .debug_logger import debug_logger). src/server.pyis only a launcher so existingpython src/server.pyconfigs keep working. Thestealth-browser-mcpconsole script andpython -m stealth_browser_mcpcall the samemain().- JavaScript templates live in
src/stealth_browser_mcp/js/and ship as package data. Default file locations come frompaths.py, not from__file__paths in other modules.
Validation
& .\venv\Scripts\python.exe -m py_compile src\server.py
& .\venv\Scripts\python.exe src\server.py --list-sections
For broader syntax validation:
Get-ChildItem src -Recurse -Filter *.py | ForEach-Object { & .\venv\Scripts\python.exe -m py_compile $_.FullName }
Unit tests and the stealth benchmark:
& .\venv\Scripts\python.exe -m unittest discover -s tests -v
& .\venv\Scripts\python.exe -m benchmarks.stealth run --mode headed
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.
- today Changed · +10 lines · +216 tokens per session 7995bd4ece70
- 14d ago Changed · +9 lines · +113 tokens per session fef4a70ac472
- 15d ago Changed · -1 lines · -56 tokens per session c885dd3a00fc
- 29d ago Changed cc612dba7d86
- 1mo ago First seen · 66 lines · 712 tokens per session scan A 8157a92d4608
stealth-browser-mcp AGENTS.md is an instructions file published in the GitHub repository vibheksoni/stealth-browser-mcp (3,270 stars, last pushed today), licensed MIT. It adds 985 tokens to every session, about $0.0039 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).