Substrate Browser MCP Server

by manuelinuxkr Your server? Claim it

local only

Substrate Browser runs on your own machine — the client starts it, so there is no endpoint to ping. 48 installs a week from npm. Last commit 1 Sep 2026.

Token-first headless browser for AIs. Extracts a tiny semantic graph, cutting HTML bloat by 95%.

Installs per day peak 372 · avg 13

a month agotoday

Installs / week

npm · substrate-browser

Stars

0 open issues

1 Sep 2026

Last commit

0 releases in 90 days

MIT

License

TypeScript

Nothing serious here today

Today is the operative word: we check Substrate Browser every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

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.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add substrate-browser -- npx -y substrate-browser

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "substrate-browser": {
      "args": [
        "-y",
        "substrate-browser"
      ],
      "command": "npx"
    }
  }
}

~/.codex/config.toml

[mcp_servers.substrate-browser]
command = "npx"
args = ["-y", "substrate-browser"]

.cursor/mcp.json

{
  "mcpServers": {
    "substrate-browser": {
      "args": [
        "-y",
        "substrate-browser"
      ],
      "command": "npx"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "substrate-browser": {
      "args": [
        "-y",
        "substrate-browser"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: SUBSTRATE_PROXY (Optional egress proxy URL (http/socks) to route all Chromium traffic through, mitigating SSRF and DNS rebinding risks.), SUBSTRATE_VIEWPORT_WIDTH (Browser viewport width in pixels (Default: 1280)), SUBSTRATE_VIEWPORT_HEIGHT (Browser viewport height in pixels (Default: 800)). The author declared them in the registry entry; get the values from the project itself.

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Substrate Browser — questions

Answers built from our own checks of this server.

Why is there no uptime for Substrate Browser?

Substrate Browser 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 substrate-browser was installed 48 times last week.

How do I connect Substrate Browser?

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 substrate-browser straight from npm; nothing to host, nothing to sign up for.

How many people use Substrate Browser?

The npm package substrate-browser was installed 48 times in the last week. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Substrate Browser open source?

Yes — it is published under the MIT licence, written in TypeScript and 1 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.