xAI's Grok Build is a coding CLI built for serious engineering work: a multi-agent architecture that splits complex tasks across parallel subagents, a native subagent view, Plan Mode, and enough slash commands to run a whole session without touching a mouse. It runs in your terminal, the same way Claude Code and Codex CLI do, which means it has the same problem when you leave your desk: the terminal does not fit in your pocket.

Shellular solves that. Grok Build keeps running on your own computer, your PC, your Mac, a Mac mini, or a VPS, so it has full context of your real codebase, branches, and dependencies. Shellular gives it a real, mobile-optimized UI on your phone, connected straight to that machine, plus a terminal, files, Git, and a localhost browser you would not get from a read-only mobile viewer.

A real Grok Build UI, on your phone

Grok Build leans hard on slash commands and subagents. Shellular does not make you type them out on a phone keyboard. It gives Grok Build a proper touch interface with the controls you actually use:

  • Slash commands. Type / and pick a command: /compact, /always-approve, etc.
  • @ file mentions. Tap @ to pull a real file from your repo into the prompt.
  • Permission approvals. Approve or deny what Grok Build wants to run, with a tap.
  • Model picker. Switch models mid-session from the UI, the same way you would with /model at your desk.

And the same setup covers Claude Code, Codex, OpenCode, Pi, Cursor CLI, and GitHub Copilot CLI, so every other agent you run alongside Grok Build is right there too.

Getting set up

  1. Install Shellular on iPhone or Android.
  2. Run the Shellular companion on the same machine you run Grok Build on. The docs walk through it.
  3. Scan the QR code to pair. The key never leaves your phone.
  4. Open Grok Build in the app and start prompting.

Beyond the agent UI, you also get a real terminal, your project files, Git, and a browser with DevTools, all one tap away. Kick off a task before you leave the house, let Grok Build's subagents work through it, steer or approve from your phone, run the tests yourself if a step needs a human call, and push. Your desktop session picks up right where you left it.

Is it secure?

Yes. Sessions are end to end encrypted. Traffic passes through a relay server, but it is encrypted on your machine and only decrypted on your phone, so the relay just forwards bytes it cannot read. The encryption key is shared by QR code and never leaves your devices. See the security overview for how it works.

Bottom line

Grok Build is a serious CLI, and it deserves more than a cramped terminal on a small screen. Shellular gives it a real mobile UI, with slash commands, @ mentions, permissions, and model controls, backed by the terminal, files, and Git on your own machine. Pair once and Grok Build follows you out the door.

Run other agents too? See Claude Code on your phone, Codex on your phone, and Pi on your phone.