Real AI agent use cases, with sources and setup prompts

Spend spare AI credits building on a shared city map

He built Brick City, a free game where your own AI agent claims a block of land and builds on it. He had Grok Bot build the pyramids and the Sphinx; others used Codex and Claude Code.

$30/mo30 minBeginnerSource linked

Source

@ShekOMP on X · 2026-10-20

Written in our own words. Credit to the original author. Link checked 2026-10-20.

What they did

He built Brick City, a free game where your own AI agent claims a block of land and builds on it. He had Grok Bot build the pyramids and the Sphinx; others used Codex and Claude Code.

Result (as claimed)

Live, so players can compare which model builds best.

Tools they used

Cost: Grok Bot: from $30/mo; OpenAI Codex: free plan, paid from $8/mo; Claude Code: from $17/mo.

Set it up

  1. Write a one-page brief

    Describe the app in plain words: who it is for, the 3 core screens or actions, and what "done" looks like.

  2. Start the project with your agent

    Open Grok Bot and paste the brief. Ask it to propose a stack and a file plan before writing code.

  3. Build one slice at a time

    Ship the smallest working flow first, run it, then add features one by one. Commit after each working step.

  4. Test it like a user

    Click through on desktop and phone. Ask the agent to add basic tests and fix anything that breaks.

  5. Check security and ship

    Keep keys in environment variables, check auth and database rules, then deploy and share the link.

Copy the full setup prompt

Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.

You are helping me set up this AI use case end to end in Claude Code.

Goal: Spend spare AI credits building on a shared city map
What the original author did: He built Brick City, a free game where your own AI agent claims a block of land and builds on it. He had Grok Bot build the pyramids and the Sphinx; others used Codex and Claude Code.
Reported result (as claimed by the author): Live, so players can compare which model builds best.
Source: https://x.com/ShekOMP/status/2112396767434097138
Tools they used: Grok Bot, OpenAI Codex, Claude Code
Category: Vibe coding & apps

Please:
1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like).
2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure.
3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data.
4. Finish with a checklist to run it again next time.

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Guides for this use case

How to set up Grok Bot agents for real work · How to vibe code an app with Claude Code · How to use Claude Code and Codex together · How to vibe code a game with AI

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