Real AI agent use cases, with sources and setup prompts

Add smart model routing inside Claude, Codex and Cursor

Built a smart model router that works directly inside Claude, Codex and Cursor sessions.

Free tier1-2 hoursIntermediateSource linked

Source

adchurch on Hacker News · 2026-06-26 · Project link

Written in our own words. Credit to the original author. Link checked 2026-10-15.

What they did

Built a smart model router that works directly inside Claude, Codex and Cursor sessions.

Result (as claimed)

Shown working in those three agents on Show HN.

Tools they used

ClaudeOpenAI CodexCursor

Cost: OpenAI Codex: free plan, paid from $8/mo; Cursor: free plan, paid from $8/mo. Checked 2026-10-14.

Set it up

  1. Pick a contained repo or task

    Start on a branch or side project where mistakes are cheap.

  2. Install and configure

    Set up Claude, OpenAI Codex, Cursor. Read what it can run on your machine and limit permissions where possible.

  3. Run it on a real task

    Give it a well-scoped issue and let it work. Review the diff like any pull request.

  4. Add guardrails

    Keep tests and CI in the loop, and never let an agent push to main or touch production secrets unattended.

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: Add smart model routing inside Claude, Codex and Cursor
What the original author did: Built a smart model router that works directly inside Claude, Codex and Cursor sessions.
Reported result (as claimed by the author): Shown working in those three agents on Show HN.
Source: https://news.ycombinator.com/item?id=48688700
Tools they used: Claude, OpenAI Codex, Cursor
Category: Dev & ops

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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