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full_duplex_code

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  • spawnSync — Synchronous process spawning in scripts/test-correction.ts
  • spawnSync — Synchronous process spawning in scripts/test-fdc.ts
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  • network request — Outbound network request in scripts/test-fdc.ts
  • fs.rmSync — Destructive file system operation in scripts/test-pages.ts
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SUMMARY

Talk to Claude Code while it works. A full-duplex voice companion powered by GPT Live 1.

README.md

Full-Duplex Code logo

Full-Duplex Code

Talk to Claude Code, Codex or Pi while it works.

▶ Watch it in action: I Coded From the Shower Without Looking at Claude Code

Full-Duplex Code: hand off a game change, take a bath, check in and redirect by voice, then come back to the finished game

Full-Duplex Code adds a voice companion to the coding agent you already use. The agent keeps its normal terminal, typing included. In the browser, a companion powered by GPT Live 1 follows what the agent does: its messages, edits, commands and tool results. It answers your questions from that, and passes your requests to the agent, even in the middle of a turn.

You don't have to stay at your desk. Hand off a task, go do something else, and keep talking to your agent from wherever you are: check in, change your mind, and hear when it's done.

Quickstart

You need macOS (the tested setup), Node.js 22.18 or newer, Chrome, a microphone, Claude Code, Codex 0.155 or newer, or Pi 1.0, installed and signed in, and an OpenAI API key with access to GPT Live 1.

1. Install

git clone https://github.com/CakeCrusher/full_duplex_code.git
cd full_duplex_code
npm ci
npm link                                    # puts the fdc command on your PATH
echo 'OPENAI_API_KEY=your-key-here' >> .env
fdc doctor                                  # checks the setup; spends nothing

2. Start your agent through fdc

In your project's folder, put fdc in front of the command you normally run. Everything after the agent's name reaches it unchanged.

cd /path/to/your/project
fdc claude          # or: fdc claude --dangerously-skip-permissions
fdc codex           # or: fdc codex --model gpt-5.5
fdc pi              # or: fdc pi --continue

3. Connect and talk

  1. Open the link fdc prints in Chrome.
  2. Press Enter in the terminal to start the agent. Claude Code asks you to confirm its development channel; choose I am using this for local development.
  3. Click Start voice and allow the microphone.
  4. Talk: "Ask Claude to add a dark mode." "What is it doing right now?" "Actually, use SQLite."

You can keep typing to the agent too, and ask the companion about it: "What did I just tell Claude?"

4. Stop

  • End voice closes the voice connection and its billing, about $0.05 a minute. The agent keeps working.
  • Exiting the agent stops everything: /exit in Claude Code, Ctrl-C twice in Codex or Pi.

From your phone

Install cloudflared once (brew install cloudflared), then add --public:

fdc --public claude

The launcher prints a phone link and a QR code once the link works. Open the page on your computer and your phone, in any order. Voice runs in one of them, and Move voice here brings it to the other. Keep the link private: anyone who has it can direct your agent.

Everyday commands

Command What it does
fdc claude --resume SESSION_ID Resume a Claude Code conversation
fdc codex resume SESSION_ID Resume a Codex session
fdc pi --continue Continue the last Pi session in this folder
fdc --public codex Also reach the companion from your phone
fdc --voice cedar claude Pick the GPT Live voice (default marin)
fdc doctor Check the setup without API spending
fdc usage Show recorded voice usage and its cost
fdc --help All options

How it works

Full-Duplex Code: talk to the voice companion while Claude Code keeps working

  • fdc starts a small bridge on this computer, then your agent's own command in the terminal.
  • The agent's hooks report what it does (for Pi, an extension loaded for that run). The bridge turns that into context for GPT Live.
  • Your voice goes from the browser straight to OpenAI. Requests reach the agent through Claude Code's channel, Codex's app server or that Pi extension, even mid-turn.

Learn more

  • User guide: the page and its timeline, what the companion follows, resuming, costs and troubleshooting.
  • Contributing: support another coding agent, and how changes are reviewed.
  • Principles: the rules behind the companion and its adapters.

License

PolyForm Noncommercial 1.0.0: free for noncommercial use; commercial use is not granted. Built by Sebastian Sosa (Noemica).

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