How to design AI agent loops: schedules, goals, and subagents in Claude Code and Codex

Claire Vo breaks down four types of AI agent loops—heartbeat, cron, hook, and goal—and demonstrates live builds of a daily aging-PR reviewer in Claude Code and a weekly skills-identification loop in Codex that spawns subagents. The episode covers the five essential components every effective loop needs and warns about cost pitfalls.

I break down every loop type from scratch—what a heartbeat, cron, hook, and goal loop actually are, when each one fits, and the five things any effective loop needs before it touches production. Then I build two live loops: a daily aging-PR reviewer in Claude Code that schedules itself at 10:15 a.m. and spins off its own subagents, and a weekly skills-identification loop in Codex that spawns goal-based subagents to validate its own output in real time. Listen or watch on YouTube, Spotify, or Apple Podcasts What you’ll learn: The plain-English definition of a loop—and why it’s just an automated prompt, not a scary new paradigm The four loop types heartbeat, cron, hook, and goal and when each one actually fits your workflow How to think about loop design using the “onboarding an employee” mental model The five things every effective loop needs: work trees, skills, plugins/connectors, subagents, and state tracking How to build a scheduled PR-review routine in Claude Code that babysits aging PRs and alerts your team How to set up a weekly skills-identification automation in Codex that spawns its own validating subagents Why goal-based loops are the hardest to write well—and where most people burn tokens for nothing The two warning signs that your loop is going to get expensive before it gets useful Brought to you by: WorkOS —Make your app enterprise-ready today Runway —The creative AI platform for images, video, and more In this episode, we cover: 00:00 https://www.youtube.com/watch?v=JoXbk2fm7jM Prompts are out and loops are in 02:30 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=150s Defining a loop 03:03 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=183s The four ways to automate a prompt: heartbeat, cron, hooks, and goals 06:03 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=363s Five things every effective loop needs 09:26 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=566s The “onboarding an employee” framework for designing loops 11:58 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=718s Live build 1: Daily aging PR loop in Claude Code 17:08 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=1028s Subagents inside loops 19:00 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=1140s Live build 2: Weekly skills identification loop in Codex 22:57 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=1377s Watching subagents spin up in real time 25:28 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=1528s Warning signals around loops 27:31 https://www.youtube.com/watch?v=JoXbk2fm7jM&t=1651s What listeners are doing with loops Tools referenced: • Claude Code: https://claude.ai/code https://claude.ai/code • Codex: https://chatgpt.com/codex https://chatgpt.com/codex • OpenClaw: https://openclaw.ai/ https://openclaw.ai/ Other references: • Claire’s article “Why OpenClaw Feels Alive Even Though It’s Not”: https://x.com/clairevo/article/2017741569521271175 https://x.com/clairevo/article/2017741569521271175 • Addy Osmani’s article on loop engineering: https://addyosmani.com/blog/loop-engineering/ https://addyosmani.com/blog/loop-engineering/ • Using Goals in Codex: https://developers.openai.com/cookbook/examples/codex/using goals in codex https://developers.openai.com/cookbook/examples/codex/using goals in codex Where to find Claire Vo: ChatPRD: https://www.chatprd.ai/ https://www.chatprd.ai/ Website: https://clairevo.com/ https://clairevo.com/ LinkedIn: https://www.linkedin.com/in/clairevo/ https://www.linkedin.com/in/clairevo/ Production and marketing by https://penname.co/ https://penname.co/ . For inquiries about sponsoring the podcast, email email protected /cdn-cgi/l/email-protection .