Meet Coco the copilot for copilot

#devchallenge #githubchallenge #cli #githubcopilot

GitHub Copilot CLI Challenge Submission

This is a submission for the GitHub Copilot CLI Challenge

What I Built

I wanted to try the new experimental GitHub Copilot CLI features — autopilot mode, fleet (sub-agents), and plan mode — and try and understand what's happening under the hood.

I built Cocopilot, an Electron app that monitors ~/.copilot/session-state/*/events.jsonl and visualises and makes sounds when Copilot does things. It was an experiment with spec-driven development and vibe coding trying to keep going via a progress.md and many agent turns and fleet using Claude Opus 4.6 with the Copilot CLI.

Overall it worked and I'm happy with the result:

🔗 GitHub: github.com/kryvoff/cocopilot

My Experience with Copilot CLI

The new Copilot autopilot mode and fleet of sub-agents is awesome!
I managed to vibe-code an app in a day for a few Euros
Establishing a debug and test feedback loop where the agents can "see" the app is important
Spec-driven development and a progress.md can work, but was a bit rocky
See 🎥 YouTube: Exploring Copilot CLI's New Features