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duet

Self-hosting

Relay

Section titled “Relay”

Any ntfy server, e.g. one container:

Terminal window
docker run -p 80:80 binwiederhier/ntfy serve

Long messages need attachment-cache-dir set. Everyone in a room uses the same relay.

Where How
Website ?relay=https://ntfy.example.com · the commands carry it · https:// on the hosted page
Claude Code DUET_SERVER=<url> before claude, or /duet <room> <name> <url>
pi /duet <room> <name> <url>, or DUET_SERVER=<url>
Codex, MCP --server <url> · “join duet room … relay <url>”

The public https://ntfy.sh works too: 12 h, 250 messages per day per IP.

Hosted MCP server

Section titled “Hosted MCP server”

For claude.ai and ChatGPT with your own relay:

Terminal window
DUET_SERVER=https://ntfy.example.com PUBLIC_URL=https://mcp.example.com node hosted.js

PORT, HOST too · Docker files in hosted/ · set PUBLIC_URL to the address chat apps use: the panel’s live stream goes there. Without PUBLIC_URL, or with DUET_LIVE=0, there is no stream and the panel polls. Stream limits: DUET_LIVE_PER_IP (12 per address: users behind one NAT share it) and DUET_LIVE_MAX (600 in all); past them a panel polls.