PairOnce

Name: PairOnce
Author: paironce

by paironceversion 0.11.2i★ –iRuns on your computer

Registry nameio.github.paironce/cli

Install

Overview

Description from the maker (original English)

Send files and text between an AI agent and your own paired devices, end-to-end encrypted.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

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

Run this in your terminal

claude mcp add cli -- npx -y paironce mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "cli": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "paironce",
        "mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account paironce, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32433 servers in this category
Published to the registry more recently than 99% of the other 32433 servers in this category
Basic checks equal to or better than 100% of the other 32433 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is PairOnce safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.11.2) reached the registry today.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Symantec Cloud DLP AIops

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computer★ 440MITUpdated 14 months ago

Install

Remote Desktop Commander

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Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated yesterday

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

paironce

Send files and text from a terminal to your own phone or computer with PairOnce. Pair once with a six-digit code; after that, npx paironce send report.pdf puts the file on your phone. End-to-end encrypted, direct between the devices whenever the network allows, and through an encrypted relay when it does not. No account.

npx paironce pair                 # shows a code: type it at paironce.com on your phone

npx paironce send build.zip # sends to the paired device npx paironce text "https://example.com/some/long/link" npx paironce receive --to ./inbox # receives files sent from the phone

The other device is any browser with https://paironce.com open: iPhone, Android, Windows, Mac or Linux. Nothing to install there.

Commands

Command	What it does
`paironce pair`	Shows a six-digit code. On the other device, open paironce.com, choose Enter a code and type it. Both screens show the same safety code; approve the device in the terminal.
`paironce pair 123456`	Joins with the code the other device shows, for a person at this terminal.
`paironce send ...`	Sends files to the paired device. With several paired devices, add `--to " "`. The other device accepts each file before it arrives.
`paironce text " "`	Sends a message or a link.
`paironce receive`	Receives files into the current folder (`--to` ). Asks before each file; `--yes` accepts every file during this run. Large files are written straight to disk, so they can be as large as the sender may send, and one cut off continues when it is sent again.
`paironce devices`	Lists paired devices.
`paironce forget`	Forgets a paired device.
`paironce mcp`	Runs as an MCP server for AI agents.

--name " " (or the PAIRONCE_NAME variable) sets what the other device shows for this one, for example --name "Build server". The key stays the same, so paired devices still know it. --agent marks this device as an AI agent on the other device (the MCP server always does). The MCP server stays connected for 30 minutes after its last tool call, so the next task needs no tap on your device; you see it as connected and can end it there. The MCP tools save inside the folder the server runs in (inbox by default). --ephemeral uses a throwaway identity in a temporary folder, which the other device forgets after a day without a connection: right for a sandbox that is thrown away.

When a paired device is not connected, the command asks it to connect: PairOnce on that device shows "Windows · Terminal wants to reconnect" with a Connect button.

Use it from an AI agent (MCP)

paironce mcp gives an agent ten tools:

Tool	What it does
`pair_device`	Pairs one of your devices. The agent gives you a six-digit code; you open paironce.com on that device, choose Enter a code and type it. The agent then tells you a safety code, and goes on only after you say your device shows the same. Once per device.
`send_file`, `send_text`	Sends to a paired device; you accept every file there.
`receive_files`	Waits while you send files from your device (a photo of a whiteboard, a scan, a document) and saves them into `./inbox`.
`request_photo`, `request_scan`, `request_file`	Asks for something specific, with the reason. Your device shows the request; you take the photo, scan the pages or choose the file there, or decline. Saved into `./inbox`.
`watch_frames`, `watch_stop`	Asks to see your camera or screen, with the reason. You share it on your device, or decline; the agent then gets a still picture each time it asks (at most two a second) and can guide you step by step. Your device shows the share and a stop button; it ends when either side stops it.
`list_devices`	Lists the paired devices.

The agent reaches only devices you paired and approved, and nothing arrives anywhere unasked. Your device marks it Agent when it asks to be approved and in your saved devices. Design and plans: Agent as a Device.

send_file does not send hidden files and folders (such as .env or .ssh), Windows's AppData, a Mac's Library or this device's own PairOnce files; you can still send those yourself with paironce send. A file that arrives after receive_files or a request stopped waiting is saved in the folder it was accepted for, and the next receive_files reports it. Changes in each version are in the releases.

Claude Code:

claude mcp add paironce -e PAIRONCE_NAME="Claude Code · Agent" -- npx -y paironce mcp

in a throwaway sandbox: ... -- npx -y paironce mcp --ephemeral

on Windows, through cmd: claude mcp add paironce -- cmd /c npx -y paironce mcp

Other clients (Cursor, Claude Desktop and others), in their MCP configuration:

{ "mcpServers": { "paironce": { "command": "npx", "args": ["-y", "paironce", "mcp"], "env": { "PAIRONCE_NAME": "Cursor · Agent" } } } }

Then ask: "pair with my phone", "send the build log to my phone", or let the agent ask you: "I need a photo of the label on the back of the router".

How it works

The CLI runs the same connection code as paironce.com: the PairOnce protocol and @paironce/core for pairing and encryption, with WebRTC from node-datachannel for direct connections and @roamhq/wrtc (libwebrtc) for the relay. Files and messages are encrypted on this computer and decrypted on the other device; the PairOnce service only introduces the two devices and, when needed, relays encrypted bytes it cannot read.

This computer's device key and the list of paired devices are kept in ~/.paironce (or $PAIRONCE_HOME), readable only by you. The private key never leaves this computer.

It connects directly whenever the networks allow it, otherwise through the encrypted relay over UDP, TCP or TLS on port 443, and where even that is blocked, through the PairOnce tunnel: the same encrypted data over a secure WebSocket to paironce.com. So it works on servers, in containers that block UDP, and behind a web proxy (HTTPS_PROXY is used automatically). In a cloud sandbox with an allow-list, such as Claude Code on the web, add paironce.com to the allowed domains. PAIRONCE_DEBUG=1 shows each step of connecting.

Requires Node.js 22 or later on Windows, macOS (x64 and arm64) or Linux (x64 and arm64).

License

Apache-2.0. PairOnce is a trademark of its owner; see https://paironce.com.

PairOnce

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Symantec Cloud DLP AIops

README from the maker

paironce

Commands

Use it from an AI agent (MCP)

in a throwaway sandbox: ... -- npx -y paironce mcp --ephemeral

on Windows, through cmd: claude mcp add paironce -- cmd /c npx -y paironce mcp

How it works

License