Real AI agent use cases, with sources and setup prompts

Rebuild a classic 2000s strategy game in Rust one system at a time

jurlycat shared how a developer is rebuilding Tzar: The Burden of the Crown in Rust and Bevy with Claude Code, porting one system at a time from the original's disassembly, playing both versions side by side and keeping 600+ tests plus session notes.

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Source

@jurlycat on X · 2026-10-18

Written in our own words. Credit to the original author. Link checked 2026-10-24.

What they did

jurlycat shared how a developer is rebuilding Tzar: The Burden of the Crown in Rust and Bevy with Claude Code, porting one system at a time from the original's disassembly, playing both versions side by side and keeping 600+ tests plus session notes.

Result (as claimed)

A new engine that runs the original campaigns and random maps up to 4K.

Tools they used

Claude CodeRustBevy

Cost: Pricing depends on the tools you pick; check each official pricing page.

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 Claude Code 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: Rebuild a classic 2000s strategy game in Rust one system at a time
What the original author did: jurlycat shared how a developer is rebuilding Tzar: The Burden of the Crown in Rust and Bevy with Claude Code, porting one system at a time from the original's disassembly, playing both versions side by side and keeping 600+ tests plus session notes.
Reported result (as claimed by the author): A new engine that runs the original campaigns and random maps up to 4K.
Source: https://x.com/jurlycat/status/2111838799382864329
Tools they used: Claude Code, Rust, Bevy
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 port or remake a classic game with AI · How to save, share and resume coding agent sessions · How to make a Godot, Unity or 3D game with AI agents · How to compare AI models on the same prompt

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