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Plasmate

Agent-native headless browser for AI agents. Converts web pages to a Semantic Object Model (SOM) instead of raw HTML — 17x average token reduction across real-world sites (up to 117x on complex pages). Native MCP server with fetch_page, extract_text, extract_links, and full browser automation. No API key required.

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Documentation

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

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