Plasmate

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

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "plasmate-2": {
      "command": "npx",
      "args": [
        "-y",
        "plasmate-2"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

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

Terminal

claude mcp add plasmate -- npx plasmate-mcp

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

config.json

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

Use with Claude Desktop

Add to claude_desktop_config.json:

config.json

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

Use with Cursor

Add to Cursor's MCP settings:

config.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

Read the full README →View source on GitHub →

Related MCP Servers

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Reviews

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Frequently Asked Questions about Plasmate

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "plasmate": { "command": "npx", "args": ["-y", "plasmate"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Plasmate →Install in Claude Desktop Install in Cursor Install in VS Code

Documentation Overview

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

Terminal

claude mcp add plasmate -- npx plasmate-mcp

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

config.json

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

Use with Claude Desktop

Add to claude_desktop_config.json:

config.json

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

Use with Cursor

Add to Cursor's MCP settings:

config.json

{
  "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

Plasmate

Quick Install

Client Config & Setup

Documentation Overview

plasmate-mcp

Install

Use with Claude Code

Use with Claude Desktop

Use with Cursor

Available Tools

Why Plasmate instead of Chrome?

Links

Part of the Plasmate Ecosystem

Related MCP Servers

Reviews

Frequently Asked Questions about Plasmate

AllMCPs Directory Badge

Technical Specs & Signals

AllMCPs Server

Own this project?

Share & Embed

Explore more

Plasmate

Quick Install

Client Config & Setup

Documentation Overview

plasmate-mcp

Install

Use with Claude Code

Use with Claude Desktop

Use with Cursor

Available Tools

Why Plasmate instead of Chrome?

Links

Part of the Plasmate Ecosystem

Related MCP Servers

Reviews

Frequently Asked Questions about Plasmate

AllMCPs Directory Badge

Technical Specs & Signals

AllMCPs Server

Own this project?

Share & Embed

Explore more