Answer pi from your iPhone

When pi stops to ask you something, Hwip sends the question to your iPhone and types your answer back into the same tmux session.

What reaches your phone

• Questions. pi has no MCP, so a rule in ~/.pi/agent/AGENTS.md has pi ask by running hwip ask: buttons and a text field.
• Approval prompts. When an extension asks you to choose through ctx.ui.select, an approval gate for one, the phone shows the question and its choices. If you answer at the keyboard first, the phone's answer is refused.
• A finished turn. A "Task done" push with the project and branch.
• The live timeline. Prompts, tool calls and replies, read from pi's own session file.
• Your prompts. Type a prompt on the phone, and it lands in the session as if you typed it at the keyboard.

Set it up

1. Install Hwip on your iPhone and sign in.
2. On your Mac: npm install -g @hwip/cli && hwip install. For pi this adds a Hwip extension to ~/.pi/agent/extensions/ and a rule to ~/.pi/agent/AGENTS.md.
3. Start pi through Hwip: hwip pi. It runs in a normal tmux session named hwip-<project>.

What a question carries

The session's git diff against HEAD and its last 60 terminal lines. Secret-looking text is masked first, best effort. Everything is sealed on your Mac with AES-256-GCM before it is sent.

What the server sees →

What it doesn't do

• Subagents are view-only. A pi subagent in another pane of the same window shows up under its parent. Watch it from the phone, and answer it at the terminal.
• tmux is required. On Windows, that means WSL.