# Coevo Caddie

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Taekyun Kim](https://cerebralvalley.ai/u/ttktktkkim)
- **GitHub:** https://github.com/dkssudgo112/coevo-meta-hackathon
- **Demo video:** https://coevo-caddie.coevo-meta-hackathon.workers.dev/demo
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/211

Coevo Caddie is a coach on the phone beside your screen. It watches how you work with any AI tool, steps in only when it matters, and helps both you and your AI get better. It is a new implementation written during the event, built from the concept of my earlier Coevo project.

People stuck with an AI tool often repeat vague requests like "make it more premium", because nothing shows them what the AI is missing. Coevo Caddie turns the phone you already keep beside your monitor into a caddie:

- It watches quietly. The camera reads your screen only when it changes, and only the boxed screen area leaves the phone (plus one disclosed setup photo if you ask it to find your screen).
- It decides when to speak. Muse Spark decides whether to step in, always with a reason, and staying quiet is a decision too. When it steps in, it asks one question in your own words, and you answer out loud.
- It makes only what the session earned. Afterwards you get a note, a playbook, applied flashcards, a two-voice podcast you can interrupt, and a 9:16 short built on your own before/after screens.
- You rehearse the next decision. A fictional colleague brings a changed request in the Practice Range. You brief the AI, judge its draft before feedback, and revise once. Muse Spark checks the words and reads the image separately; the before-and-after view keeps what you said distinct from what the AI actually drew. The first attempt stays intact and the revision is labeled with the Caddie.
- Your AI learns too. It proposes a Caddie card for your AI. Approve it and start a pinned chat with it, and next time in that chat your AI asks the right questions first while the Caddie stays quiet.

Evidence is labeled honestly: on your own, with the Caddie, AI wrote it, or not seen yet.

What is real: screen readings, intervention messages, scenarios, notes, playbooks, flashcards, podcast and short scripts, and practice images were produced by Meta's models through the deployed app. Deterministic rules enforce evidence labels and compare a person's Practice judgment with the model's image reading. The podcast and short voices are Kokoro-82M text-to-speech on Modal. The café owner and job applicant are scripted, fictional personas; the AI screens are actual replies to those scripts. As in our earlier Coevo work, the phone is assumed to stand beside the monitor: the phone screen is verified in a phone-sized browser with a controlled camera and a synthetic voice, so physical camera accuracy and a human voice were not measured.

Demo: https://coevo-caddie.coevo-meta-hackathon.workers.dev/demo

Live app: https://coevo-caddie.coevo-meta-hackathon.workers.dev. Open /desk on a computer and /caddie on a phone.

No-phone walkthrough: https://coevo-caddie.coevo-meta-hackathon.workers.dev/practice-preview. Explore the new Practice scene, judge its saved first draft and compare the recorded revision. The scene, images and readings are real model outputs from a scripted sample; visitor choices are local, not saved or sent to a model.

Work-session replay: https://coevo-caddie.coevo-meta-hackathon.workers.dev/sample. This labeled recording shows actual Meta AI replies, the Caddie's output, five formats, podcast and short with no new model calls. "Run it live" makes fresh calls.

## More from Meta Global AI Developer Hackathon

- [Floodline](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/208)
- [ShopThread](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/209)
- [Zheng Zhang](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/210)
- [Felix Le](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/212)
- [Aahwan IT Group](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/213)
- [Crowsnest](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/214)

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Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/211. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt