Horncall

One app to approve them all. Answer your AI coding agents' permission requests from your Android phone — Claude Code, Gemini CLI, GitHub Copilot CLI and OpenAI Codex CLI, on any number of computers.

This repository is the PC add-on (open source, MIT). It hooks into the agents' own, documented hook systems and forwards a permission question to the phone only while you switch it on (you're away from the desk). At the desk, everything works as before.

• Guide: https://horncall.bitlionaire.me · phone app: Android (see the guide)
• End-to-end encrypted: AES-256-GCM with a key made on your computer and handed to the phone only by QR code. The relay sees ciphertext.
• The phone signs every decision (Android Keystore, ECDSA P-256); the computer accepts only answers signed by the phone it paired with. A stolen key file can read orders, but approve nothing.
• Dangerous commands (rm -rf, force push, DROP TABLE, edits to secrets, hooks or CI…) get a red card with the reasons and need a long press.

Install

Pick one. All of them end with the same pairing step: setup shows a QR code to scan in the app, in the browser or, over SSH and on headless servers, right in the terminal (horncall pair draws it there too).

Claude Code plugin (Claude Code keeps it up to date):

/plugin marketplace add bitlionaire/horncall
/plugin install horncall@horncall
/horncall:approver setup

pipx / uv (a horncall command; hooks for every agent, Claude Code via its settings.json):

pipx install horncall        # or: uv tool install horncall
horncall setup

ZIP with a wizard (no Python tooling needed beyond Python 3.10+): download horncall-plugin.zip from the guide, unpack anywhere and run setup.cmd (macOS/Linux: sh setup.sh). It copies itself to the per-user program folder (%LOCALAPPDATA%\Horncall\app, ~/Library/Application Support/Horncall/app, ~/.local/share/horncall/app); the unpacked folder can be deleted.

By hand: see exactly what would be added, then paste it yourself or let it write:

horncall install gemini --print     # claude | gemini | copilot | codex | claude-statusline
horncall install gemini

What the install changes

Other settings stay untouched; the first change to a file leaves a *.horncall-backup copy. The setup wizard lists the files and asks before writing. No services, autostart entries or admin rights. Remove everything: horncall uninstall all (in Claude: /horncall:approver uninstall all).

Every day

Gemini CLI asks on its own first — start it with gemini --yolo (same as --approval-mode yolo) so only the phone asks. Codex CLI: open /hooks and enable the three Horncall hooks.

How it works

The agent runs a hook (horncall hook <agent>) on a permission request. While Horncall is off it exits at once and the agent shows its normal dialog. While on, it encrypts the request, publishes it to an ntfy relay (ours by default, any ntfy server works: horncall pair --server) and waits for the phone's signed answer, which it returns to the agent as allow or deny. Answering on the computer instead removes the card from the phone.

Development

python -m pip install -r plugin/requirements.txt pytest
python -m pytest

Issues and pull requests are welcome. Horncall is an independent project, not affiliated with Anthropic, OpenAI, Google or GitHub; their product names only describe compatibility. Contact: bitlionaire.me@gmail.com