realtimeclipboard-mcp

An end-to-end encrypted clipboard, as tools for an AI agent. Drop a clip from Claude Code on one machine and pick it up in a browser, an editor or a terminal on another — or the other way round.

Text is encrypted before it leaves the machine and routed by a hash of the key. The relay stores nothing and can read nothing.

Install

{
  "mcpServers": {
    "realtimeclipboard": {
      "command": "npx",
      "args": ["-y", "realtimeclipboard-mcp"]
    }
  }
}

Set REALTIMECLIPBOARD_RELAY to point at your own relay. Needs Node 22+.

Tools

| | | |---|---| | new_session | start a session and get a share link for your other device | | join_session | join one by key or link, with a PIN if it is locked | | send_clip | share text with every device in the session | | recent_clips | what has arrived, newest first | | wait_for_clip | block until the next clip lands — for "I'm about to copy something" |

Read this before you wire it to an agent

Clips are attacker-controlled. Anyone holding the key can join the room and send anything, and a model reading a clip may act on what it reads. That is a prompt-injection surface.

What this server does about it: every clip is stripped of invisible characters and trailing newlines before you see it, one that reads like a shell command is labelled as such, and every tool that returns clip text says in its own description that the content is data rather than instructions.

What it does not do: run anything. There is no shell, no file access and no eval in this server. Treat the labelling as advice to the model and that as the actual control.

Share keys with people, not with rooms you do not control.

Source

github.com/akshaynikhare/RealtimeClipboard · MIT · rules that govern edits here: CLAUDE.md