Koskamo

substrate-browser MCP

An open-source MCP server that acts as a headless browser for AI agents. It extracts a tiny semantic graph from web pages, reducing HTML token bloat by 95% to help local LLMs avoid hallucinating during web tasks. It provides tools for navigation, clicking, typing, and screenshotting via a compressed graph interface.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

substrate-browser MCP logo, by manuelinuxkrCommunity listingLocal stdioSource reviewed; not executedPublished by manuelinuxkr
Vendor documentation

What you can do with it

  • Load a URL and get back a compressed page graph
  • Click elements by numeric ID
  • Type text into input fields
  • Take a visual snapshot with graph data

Source and maintenance

Community listingRegistry 2.0.2
mcp-registry: io.github.manuelinuxkr/substrate-browser@2.0.2Source repository
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

substrate-browser 2.0.2

npm
substrate-browser package definition
{
  "version": "2.0.2",
  "transport": "stdio",
  "identifier": "substrate-browser",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "SUBSTRATE_PROXY",
      "format": "string",
      "description": "Optional egress proxy URL (http/socks) to route all Chromium traffic through, mitigating SSRF and DNS rebinding risks."
    },
    {
      "name": "SUBSTRATE_VIEWPORT_WIDTH",
      "format": "string",
      "description": "Browser viewport width in pixels (Default: 1280)"
    },
    {
      "name": "SUBSTRATE_VIEWPORT_HEIGHT",
      "format": "string",
      "description": "Browser viewport height in pixels (Default: 800)"
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "substrate-browser-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "substrate-browser@2.0.2"
      ],
      "env": {
        "SUBSTRATE_PROXY": "<YOUR_SUBSTRATE_PROXY>",
        "SUBSTRATE_VIEWPORT_WIDTH": "<YOUR_SUBSTRATE_VIEWPORT_WIDTH>",
        "SUBSTRATE_VIEWPORT_HEIGHT": "<YOUR_SUBSTRATE_VIEWPORT_HEIGHT>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "substrate-browser-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "substrate-browser@2.0.2"
      ],
      "env": {
        "SUBSTRATE_PROXY": "<YOUR_SUBSTRATE_PROXY>",
        "SUBSTRATE_VIEWPORT_WIDTH": "<YOUR_SUBSTRATE_VIEWPORT_WIDTH>",
        "SUBSTRATE_VIEWPORT_HEIGHT": "<YOUR_SUBSTRATE_VIEWPORT_HEIGHT>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "substrate-browser-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "substrate-browser@2.0.2"
      ],
      "env": {
        "SUBSTRATE_PROXY": "<YOUR_SUBSTRATE_PROXY>",
        "SUBSTRATE_VIEWPORT_WIDTH": "<YOUR_SUBSTRATE_VIEWPORT_WIDTH>",
        "SUBSTRATE_VIEWPORT_HEIGHT": "<YOUR_SUBSTRATE_VIEWPORT_HEIGHT>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "substrate-browser-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "substrate-browser@2.0.2"
      ],
      "env": {
        "SUBSTRATE_PROXY": "<YOUR_SUBSTRATE_PROXY>",
        "SUBSTRATE_VIEWPORT_WIDTH": "<YOUR_SUBSTRATE_VIEWPORT_WIDTH>",
        "SUBSTRATE_VIEWPORT_HEIGHT": "<YOUR_SUBSTRATE_VIEWPORT_HEIGHT>"
      }
    }
  }
}

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