Plasmate

Name: Plasmate
Author: plasmate-labs

@plasmate-labsMCP server · External

Browser engine for AI agents. HTML in, Semantic Object Model out. 16x fewer tokens.

Web scrapingv0.4.1Apache-2.0JavaScript

Freeno charge per call

How to install

Runs on your machine from its package; the steps are below.

What it does

Reads
Writes
High impact

At most: moves money, runs code or commands, deletes data, or sends messages for you.

What it costs

Free

Odel charges nothing per call. The publisher may charge for its own service.

Runs locally over stdio

This server isn't hosted — your MCP client launches it from a package registry. Use one of the commands below, or drop the config into your client (e.g. Claude Desktop).

npmplasmate-mcpv0.4.1

Run

npx -y plasmate-mcp

MCP client config

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

README2 min readView on 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

bash

# 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

bash

claude mcp add plasmate -- npx plasmate-mcp

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

json

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

Use with Claude Desktop

Add to claude_desktop_config.json:

json

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

Use with Cursor

Add to Cursor's MCP settings:

json

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

This repo is also a Cursor plugin (.cursor-plugin/plugin.json + mcp.json). Test locally by copying it to ~/.cursor/plugins/local/plasmate. Submit the public repo at cursor.com/marketplace/publish.

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