Plasmate MCP

Agent-native headless browser that converts web pages to structured Semantic Object Model (SOM) JSON -- 4x fewer tokens than raw HTML with lower latency on Claude and GPT-4o.

GitHub

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:

ToolDescription
fetch_pageFetch a URL and get the Semantic Object Model (SOM)
extract_textGet clean readable text from any URL
open_pageOpen a persistent browser session
clickClick elements by SOM ID
evaluateExecute JavaScript in the page
close_pageClose 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

Part of the Plasmate Ecosystem

Engineplasmate - The browser engine for agents
MCPplasmate-mcp - Claude Code, Cursor, Windsurf
Extensionplasmate-extension - Chrome cookie export
SDKsPython / Node.js / Go / Rust
FrameworksLangChain / CrewAI / AutoGen / Smolagents
ToolsScrapy / Audit / A11y / GitHub Action
ResourcesAwesome Plasmate / Notebooks / Benchmarks
Docsdocs.plasmate.app
W3CWeb Content Browser for AI Agents

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