Plasmate Mcp Server
About
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.
Details
- License
- Apache-2.0
Explore
- Semantic Object Model (SOM) reduces tokens by 16.6×.
- 50× faster than Chrome with no rendering overhead.
- Memory usage of only 30MB vs Chrome’s 300MB+.
- Provides structured JSON output, not raw HTML.
- Tools: fetch_page, extract_text, open_page, click, evaluate, close_page.
- Works with multiple MCP clients: Claude Code, Claude Desktop, Cursor, Windsurf.
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Plasmate Mcp ServerCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Install the wrapper globally with npm install -g plasmate-mcp and the Plasmate engine via pip install plasmate, cargo install plasmate, or brew install plasmate. Then add configuration to your MCP client (e.g., Claude Code settings or Claude Desktop config) using npx plasmate-mcp as the command.
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
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 |
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"plasmate mcp server": {
"plasmate": {
"command": "plasmate",
"args": [
"mcp"
]
}
}
}
}McpServers
{
"plasmate": {
"command": "plasmate",
"args": [
"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
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