Cinematic deep dive Hands-On: Coding Agents from Your Phone 9 min Hands-on tutorial

A Website From Your Phone

Four prompts. One phone. A live website.

Codex remote control, built-in images and GitHub Pages, step by step

Chapters

  1. Intro
  2. What You Need
  3. The Idea
  4. Connect
  5. Build the Site
  6. Images
  7. Mobile Friendly
  8. Deploy
  9. Common Mistakes
  10. Recap

Who it's for

People who want to build while away from their desk, and anyone curious what Codex remote control can really do. Beginner level: you should know what a GitHub repo is; no web framework knowledge needed.

Numbers worth knowing

  • Codex working time in our run: 5:06 + 4:43 + 3:56 + 1:17 ≈ 15 min. Deploy run: 17 s.
  • 44 px minimum tap target, 16 px body text: common mobile guidelines we used as rules (Apple HIG 44 pt).
  • Page images ≈137–157 KiB per view; social card ≈95 KiB (Codex's own measurements).

The Workflow Codex Wrote

.github/workflows/pages.yml
on:
  push:
    branches: [main]
permissions:
  pages: write
  id-token: write
jobs:
  deploy:
    steps:
      - uses: actions/checkout@v6
      - uses: actions/configure-pages@v5
      - run: |
          mkdir _site
          cp index.html styles.css script.js _site/
          cp -R images _site/images
      - uses: actions/upload-pages-artifact@v4

By the End You Will

Connect

Drive Codex on your computer from the ChatGPT app

Build

A one-page site in plain HTML, CSS and JavaScript

Illustrate

Every image made by Codex itself

Publish

Live on GitHub Pages, deployed on every push

Sources

  • GitHub Docs: Using custom workflows with GitHub Pages; actions/configure-pages, upload-pages-artifact, deploy-pages.

  • OpenAI Codex CLI 0.160 (codex exec, sandbox modes, built-in image generation) and the ChatGPT app's Codex page.

  • Run log and transcripts: tutorials/github-pages-site-from-phone-tutorial-vertical/.

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