Introduction to Arc0

Arc0 works with your existing AI coding assistants—Claude Code, Codex, Gemini CLI—without any modifications to the CLI or its harness. It connects seamlessly via tmux, so you don't need to change your workflows or learn another tool. Just run your agents the way you always have.

The Problem

Coding agents like Claude Code, Codex, and Gemini CLI have changed how developers work. You describe what you want, and an AI writes the code. But there's a catch: these agents run in your terminal, connected to your local dev environment.

And they need direction from you.

You give them prompts to guide their work. You monitor their progress to catch issues early. You approve their plans before they start building. You track the changes they make. You review their code before it ships. If you're not at your laptop—grabbing coffee, in a meeting, on a commute—the whole workflow stalls.

Your agent needs guidance. But you're not at your desk.

The Solution

Arc0 bridges your terminal agent to your phone. Direct your agents from anywhere—send prompts, approve plans, monitor progress, track changes, and review code. Keep work moving without opening your laptop.

How It Works

1. Install Arc0 CLI on your development machine
2. Download the mobile app for iOS or Android (or use the webapp)
3. Run your agent as usual—Arc0 CLI captures the session via tmux
4. Direct from your phone—send prompts, approve plans, review changes

Arc0 CLI runs a local server and connects to your phone through a secure WSS tunnel. WebSocket enables fast, real-time communication between you and your coding agents.

Learn more about the architecture →

Key Features

Plan Approval

Review your agent's implementation plan before it starts coding. Approve the approach, request changes, or redirect entirely—all from your phone.

Progress Monitoring

Watch what your agent is doing in real-time. See which files it's working on, what commands it's running, and how far along it is. Catch issues early.

Prompt & Direct

Send prompts to guide your agent's work. Provide clarification, adjust scope, or pivot direction mid-task:

• "Focus on the API first, we'll handle the UI later"
• "Use the existing auth system, don't create a new one"
• "Skip the tests for now, we need the feature shipped"

Change Tracking

See every file your agent modifies. Track additions, deletions, and modifications across your codebase in a clear, organized view.

Code Review

Review diffs on a mobile-optimized interface. Approve changes, request fixes, or flag issues—before anything gets committed.

The Architect Mindset

With capable coding agents, your role shifts from writing code to directing it. You set the vision, approve the approach, monitor execution, and review the output. You're the architect; your agents are the builders.

This doesn't require constant presence. Architects check in, make decisions, course-correct, and move on. That's the workflow Arc0 enables—quick, decisive interactions that keep your agents productive while you handle everything else.

Your judgment is the bottleneck. Arc0 removes the friction around expressing it.

Open Source

Arc0 CLI is fully open source under the MIT license. You can:

• Self-host on your own infrastructure
• Audit the code to verify security
• Extend it for your workflow
• Contribute improvements back

Your code never leaves your machine—Arc0 only streams the conversation and diffs.

Next Steps