El Bruno

⚠️ This blog post was created with the help of AI tools. Yes, I used a bit of magic from language models to organize my thoughts and automate the boring parts, but the geeky fun and the 🤖 in C# are 100% mine.

Hi!

Sometimes you don’t need a framework, a service, or a startup idea.
You just need a small tool that actually works.

In my latest video, I put GitHub Copilot CLI to work building a .NET console app that merges 65 MP3 files into a single 3.6GB audio file. No fluff, no fake demo — a real utility for real problems like podcast editing, long recordings, or preparing audio for transcription.

The interesting part isn’t just that it works — it’s how:

• Streaming audio directly to disk to avoid memory limits
• Using Spectre.Console for a clean CLI experience
• Letting Copilot scaffold fast, but still making the right engineering calls
• Learning when to run outside Copilot CLI to get real-time output

The whole thing comes together in under ten minutes and sets up some nice next steps, like local transcription with Whisper and turning quick hacks into reusable tools.

👉 Watch the video, grab the code, and try it yourself.
This is Copilot CLI doing what it does best: helping you ship useful things faster.