Skills/npm/mcp-simple-browser

mcp-simple-browser@2.4.1

VERIFIED

Publisher claims: "An MCP (Model Context Protocol) server that provides browser automation tools powered by CloakBrowser." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher solvvn · publishing for 175 daysInstalls 1,020Last detonated 2d ago
$claude mcp add mcp-simple-browser -- npx -y @solvvn/mcp-simple-browser
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Coverage

Server started and answered tools/list.
Tested
MCP initialize and tools/list · every tool description, for hidden instructions · every file read, file written and host contacted by what ran
Not tested
what the tools do when called with real credentials

Before you give it your token

It will ask for
no credential variables read in the code
Where it talks to
no vendor host named in the codeAlso google.com, duckduckgo.com, bing.com — not the publisher's domain; check what for before connecting.
What the honeypot saw
no credential files read · no network
What we could not test
what the tools do when called with real credentials

Connect it under the guard; read the third-party hosts first. The code names google.com, duckduckgo.com, bing.com as well as its own vendor. The guard pins the network to the hosts the honeypot saw.

$vet-skills run --net declared -- npx -y @solvvn/mcp-simple-browser

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios) on 2026-11-12 and scored it 84/100 (Verified). It did what it claims and nothing else we could detect: no undeclared network egress, no credential reads, no persistent instruction writes. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 27 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
7.1sprocessdependency install exit 0
27sclaimed23 tools: browser_set_headless, browser_set_viewport, browser_navigate, browser_click, browser_type, browser_get_content, browser_get_text, browser_inspect, browser_evaluate, browser_search, browser_close, browser_save_screenshot, browser_print_to_pdf, browser_go_back, browser_go_forward, browser_reload, browser_run_flow, browser_session, browser_evidence, browser_devtools, browser_emulate, browser_mock, browser_storage
27sprocessscript backend runs setup only
27sprocessno install scripts to re-run

Static findings

HIGH
URL with embedded credentialsdist/tools.js:356 · URL with embedded credentials — may be phishing or credential leakingproxy: z.string().optional().describe("http://user:pass@host:port"),Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
HIGH
Access to sensitive file pathsdist/background.js:122 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesawait run("open", ["-g", "-n", "-a", app, ...env.flatMap(([key, value]) => ["--env", `${key}=${value}`]), "--args", ...args]);Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagedist/tools.js:393 · npx invocation of non-well-known package — may execute untrusted code…ors and failed requests. traceStart/traceStop: Playwright trace.zip (open with `npx playwright show-trace`). dir: where evidence is saved.", schema: { act…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈66 tok
1 file · 30 in bundle
Tool list per prompt
≈5,710 tok
23 tools · 248 per tool
Handshake
1034 ms
launch to tools/list, stdio
Undocumented tools
1
description under 20 chars · avg 195

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

No advisories in OSV for @solvvn/mcp-simple-browser@2.4.1 as of 2d ago. This is the package itself, not its dependencies.