Summary
Connects Claude and other MCP clients to Plasmate's browser engine instead of traditional headless Chrome. Exposes six core tools: fetch_page and extract_text for quick content retrieval, open_page for persistent sessions, click and evaluate for interaction, and close_page for cleanup. The main hook is token efficiency. Plasmate returns a Semantic Object Model instead of raw HTML or DOM dumps, which the maintainers benchmark at 16x fewer tokens. You'd reach for this when you're building agents that need to browse the web repeatedly and token costs or context windows are tight. Requires installing both the npm wrapper and the Plasmate engine itself via pip, cargo, or homebrew.
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →
Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →
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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
Links
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 |
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →Categories
Registryactive
Packageplasmate-mcp
TransportSTDIO
UpdatedMar 25, 2026
