What is duplex?
duplex is a MCP server by Eric-huang799 that a browser shared by a human and an AI — same tabs, same live session; 24 MCP tools (snapshot, click, type, screenshot, tabs, annotations), built-in models or any MCP client, Esc takeover. It is listed under Browser & web and has 6 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | Eric-huang799 |
| Repository | Eric-huang799/duplex |
| Popularity | 6 GitHub stars |
| Category | Browser & web |
| Security | Low risk (96/100) |
| Rank | #2,018 of 4,418 MCP servers; #181 in Browser & web |
| License | MIT |
| Last commit | 2026-10-15 |
| Stars this week | +2 |
| Runs | Locally |
| Language | TypeScript |
| Platforms | macOS, Windows, Linux |
Is duplex safe to install?
duplex scores 96/100 on the MCPMods security check: Low risk. No checks raised a concern. It passed 5 of 6 checks.
MCP server results come from listing signals: who publishes it, where your data goes and what it can do. The code itself is not scanned yet.
| Check | Result |
|---|---|
| Community-built server | Note |
| Runs on your machine only | Pass |
| No credentials mentioned | Pass |
| Read-only by description | Pass |
| No code execution | Pass |
| Source on GitHub | Pass |
How do I install duplex?
- Find the launch command. The README says how the server starts (npx, uvx, docker or a remote URL) and which API keys it needs.
https://github.com/Eric-huang799/duplex
- Add it to Claude Code. Replace the part after -- with the command from the README. Remote servers use --transport http with a URL.
claude mcp add duplex -- <command from README> claude mcp add --transport http duplex <server-url>
- Check it connected. This lists your MCP servers and their status.
claude mcp list
Or ask Claude to set it up
Paste this into Claude Code and it installs duplex for you:
Add the "duplex" MCP server from https://github.com/Eric-huang799/duplex to Claude Code. Read its README for the launch command and any API keys I need, run claude mcp add, then check that it connects.