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io.github.plasmate-labs/plasmate

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

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package plasmate-mcp
Claude Code 
claude mcp add plasmate -- npx -y plasmate-mcp@0.4.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "plasmate": {
            "command": "npx",
            "args": [
                "-y",
                "plasmate-mcp@0.4.1"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. plasmate-mcp
  2. Install
  3. Use with Claude Code
  4. Use with Claude Desktop
  5. Use with Cursor
  6. Available Tools
  7. Why Plasmate instead of Chrome?
  8. Links
  9. Part of the Plasmate Ecosystem

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"]
    }
  }
}

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:

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

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

Frequently asked questions

What is io.github.plasmate-labs/plasmate?

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

How do I install io.github.plasmate-labs/plasmate?

It runs on your machine. In Claude Code: claude mcp add plasmate -- npx -y plasmate-mcp@0.4.1. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.plasmate-labs/plasmate need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.plasmate-labs/plasmate open source?

Yes. Its code is on GitHub under the Apache-2.0 license.

Who maintains io.github.plasmate-labs/plasmate?

It is published by plasmate-labs. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.