Borrowing it
Nothing to install: this file belongs to RobithYusuf/mcp-stealth-chrome. 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/RobithYusuf/mcp-stealth-chrome/main/AGENTS.mdgit clone --depth 1 https://github.com/RobithYusuf/mcp-stealth-chromeWrote 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/robithyusuf/mcp-stealth-chrome/agents-md)<a href="https://agentmods.dev/instructions/robithyusuf/mcp-stealth-chrome/agents-md"><img src="https://agentmods.dev/badge/instructions/robithyusuf/mcp-stealth-chrome/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/robithyusuf/mcp-stealth-chrome/agents-md"><img src="https://agentmods.dev/badge/instructions/robithyusuf/mcp-stealth-chrome/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 | $0.04144 | $0.04144 |
| Opus 5.5 | $0.01658 | $0.01658 |
| Sonnet 5.5 | $0.00829 | $0.00829 |
| Haiku 4.5 | $0.00414 | $0.00414 |
Grade A, and why
mcp-stealth-chrome AGENTS.md scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- `export_curl` emits both a `curl` string and an `http_request(impersonate='chrome')` call, and How it starts
The opening of the file, as written. The whole thing — 257 lines — stays where its author put it; the contents beside it link to each section on GitHub.
mcp-stealth-chrome — Agent Guide
This guide applies to the whole repository and is the shared source of instructions for coding agents. It is not here to govern every decision — it exists to preserve the invariants that are easy to miss, almost all of which were learned from a shipped bug. Developer requests may override working defaults; hard constraints may only be overridden when the developer explicitly asks.
Product and repository map
An MCP server (stdio JSON-RPC) that gives an agent a stealth browser: 160 tools over
nodriver (direct CDP, no WebDriver), plus a
browserless HTTP path with a real Chrome TLS fingerprint. Published on PyPI as mcp-stealth-chrome.
uvx mcp-stealth-chrome → Python 3.11+ → FastMCP → nodriver → Chrome/Chromium (CDP)
└→ curl_cffi (Chrome JA3/JA4) → browserless HTTP
└→ opencv-python → template matching / vision
src/mcp_stealth_chrome/server.py— entry plus most tools, sectioned by══════banners.src/mcp_stealth_chrome/state.py—BrowserState(multi-instance), profile discovery, Chrome lookup, lock/PID helpers.src/mcp_stealth_chrome/snapshot.py— theSNAPSHOT_JSIIFE andformat_snapshot.src/mcp_stealth_chrome/helpers.py—ok/err, ref resolution, path confinement, JSON parsing.src/mcp_stealth_chrome/patches.py— runtime monkey-patches for nodriver/CDP drift.src/mcp_stealth_chrome/tools/—research.py,devtools.py,vision.py,network_http.py; each registers itself on import.tests/test_registry.py— the tool-surface gate.tests/test_reliability_e2e.pyandtests/test_agent_ergonomics.py— behaviour, real browser and fast unit respectively.README.md— the authoritative tool list.docs/— install, demo, research method, proof images.- Runtime data lives outside the repo:
~/.mcp-stealth/{profile,profiles,screenshots,exports, storage-states,identities,window-state}.
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 · 257 lines · 4,144 tokens per session scan A 6e709ac0a3eb
mcp-stealth-chrome AGENTS.md is an instructions file published in the GitHub repository RobithYusuf/mcp-stealth-chrome (24 stars, last pushed 1mo ago), licensed MIT. It adds 4,144 tokens to every session, about $0.0166 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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