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Browser automation

Substrate Browser

io.github.manuelinuxkr/substrate-browser · v2.0.2

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

Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add substrate-browser -e SUBSTRATE_PROXY=<SUBSTRATE_PROXY> -e SUBSTRATE_VIEWPORT_WIDTH=<SUBSTRATE_VIEWPORT_WIDTH> -e SUBSTRATE_VIEWPORT_HEIGHT=<SUBSTRATE_VIEWPORT_HEIGHT> -- npx -y [email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "substrate-browser": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "SUBSTRATE_PROXY": "<SUBSTRATE_PROXY>",
        "SUBSTRATE_VIEWPORT_WIDTH": "<SUBSTRATE_VIEWPORT_WIDTH>",
        "SUBSTRATE_VIEWPORT_HEIGHT": "<SUBSTRATE_VIEWPORT_HEIGHT>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "substrate-browser": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "SUBSTRATE_PROXY": "<SUBSTRATE_PROXY>",
        "SUBSTRATE_VIEWPORT_WIDTH": "<SUBSTRATE_VIEWPORT_WIDTH>",
        "SUBSTRATE_VIEWPORT_HEIGHT": "<SUBSTRATE_VIEWPORT_HEIGHT>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "substrate-browser": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "SUBSTRATE_PROXY": "<SUBSTRATE_PROXY>",
        "SUBSTRATE_VIEWPORT_WIDTH": "<SUBSTRATE_VIEWPORT_WIDTH>",
        "SUBSTRATE_VIEWPORT_HEIGHT": "<SUBSTRATE_VIEWPORT_HEIGHT>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
SUBSTRATE_PROXY
Optional		Optional egress proxy URL (http/socks) to route all Chromium traffic through, mitigating SSRF and DNS rebinding risks.
SUBSTRATE_VIEWPORT_WIDTH
Optional		Browser viewport width in pixels (Default: 1280)
SUBSTRATE_VIEWPORT_HEIGHT
Optional		Browser viewport height in pixels (Default: 800)

Details

Package[email protected] (NPM, stdio)
First published1 Sep 2026
Last updated1 Sep 2026
Registry nameio.github.manuelinuxkr/substrate-browser

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