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Browserbash MCP Server

local only

Browserbash runs on your own machine — the client starts it, so there is no endpoint to ping. 95 installs a week from npm. Last commit 10 Jul 2026.

Plain-English browser tests for AI agents: real Chrome, deterministic verdicts. Free, no API keys.

Installs per day peak 194 · avg 23 · +54% w/w
a month agotoday
95
Installs / week
npm · browserbash-cli
2
Stars
0 open issues
10 Jul 2026
Last commit
0 releases in 90 days
License
TypeScript

What the code does

We read the source, 19 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable launch-assets/producthunt/render.mjs:28
  const srcPath = path.join(HTML_DIR, src);
        spawn(cmd, args, { stdio: 'ignore', detached: true }).unref();
Page executes code built at runtime site/public/math.html:189
  $("rows").innerHTML = calc.map(c => {

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add browserbash -- npx -y browserbash-cli
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "browserbash": {
      "args": [
        "-y",
        "browserbash-cli"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.browserbash]
command = "npx"
args = ["-y", "browserbash-cli"]
.cursor/mcp.json
{
  "mcpServers": {
    "browserbash": {
      "args": [
        "-y",
        "browserbash-cli"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "browserbash": {
      "args": [
        "-y",
        "browserbash-cli"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: ANTHROPIC_API_KEY (Anthropic API key. Optional: without it BrowserBash auto-resolves a free local Ollama model.). The author declared them in the registry entry; get the values from the project itself.

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Browserbash — questions

Answers built from our own checks of this server.

Why is there no uptime for Browserbash?
Browserbash runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package browserbash-cli was installed 95 times last week.
How do I connect Browserbash?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls browserbash-cli straight from npm; nothing to host, nothing to sign up for.
How many people use Browserbash?
The npm package browserbash-cli was installed 95 times in the last week. Week over week that is +54%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Browserbash open source?
We cannot say either way: written in TypeScript and 2 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.