plasmate-mcp

MCP server for Plasmate - the browser engine for AI agents.

Gives Claude Code, Claude Desktop, Cursor, Windsurf, and any MCP client the ability to browse the web through Plasmate instead of Chrome.

Install

# Install the MCP wrapper
npm install -g plasmate-mcp

# Install the Plasmate engine (pick one)
pip install plasmate
# or: cargo install plasmate
# or: brew tap plasmate-labs/plasmate && brew install plasmate

Use with Claude Code

claude mcp add plasmate -- npx plasmate-mcp

Or manually add to ~/.claude/settings.json:

{
  "mcpServers": {
    "plasmate": {
      "command": "npx",
      "args": ["-y", "plasmate-mcp"]
    }
  }
}

Use with Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "plasmate": {
      "command": "npx",
      "args": ["-y", "plasmate-mcp"]
    }
  }
}

Use with Cursor

Add to Cursor's MCP settings:

{
  "mcpServers": {
    "plasmate": {
      "command": "npx",
      "args": ["-y", "plasmate-mcp"]
    }
  }
}

Available Tools

Once connected, your AI gets these tools:

| Tool | Description | |------|-------------| | fetch_page | Fetch a URL and get the Semantic Object Model (SOM) | | extract_text | Get clean readable text from any URL | | open_page | Open a persistent browser session | | click | Click elements by SOM ID | | evaluate | Execute JavaScript in the page | | close_page | Close a browser session |

Why Plasmate instead of Chrome?

• 16.6x fewer tokens - SOM is dramatically smaller than DOM dumps
• 50x faster - No rendering engine overhead
• 30MB memory - vs Chrome's 300MB+
• Structured output - Clean JSON, not raw HTML

Links

• Plasmate
• Documentation
• W3C Community Group
• GitHub

Part of the Plasmate Ecosystem

| | | |---|---| | Engine | plasmate - The browser engine for agents | | MCP | plasmate-mcp - Claude Code, Cursor, Windsurf | | Extension | plasmate-extension - Chrome cookie export | | SDKs | Python / Node.js / Go / Rust | | Frameworks | LangChain / CrewAI / AutoGen / Smolagents | | Tools | Scrapy / Audit / A11y / GitHub Action | | Resources | Awesome Plasmate / Notebooks / Benchmarks | | Docs | docs.plasmate.app | | W3C | Web Content Browser for AI Agents |