Every week, the GitHub team runs a stream called Rubber Duck Thursdays, where we build projects live, cowork with our community, and answer questions!
This week, we built a very fun project together using the GitHub Copilot CLI! Let me tell you about it.
💡 New to GitHub Copilot CLI? Here’s how to get started.
In a lot of social media tweets and launches, you often see accounts post things like:
We shipped the most amazing emoji list generator ever. It:
💻 Works in the CLI
🤖 Uses the Copilot SDK to intelligently convert your bullet points to relevent emoji
📋 Copies the result to the clipboardIt’s beautiful. But coming up with the perfect emoji is far too slow for me in this “move fast and break things” world. I have projects to build! Repos to vibe! Pull requests to merge! I can’t be thinking about emojis!
And thus, on the stream, we build an emoji list generator (very descriptively called Emoji List Generator) that:
🖥️ Runs in the terminal
📋 You paste or write a list
⌨️ You hit Ctrl + S
📎 You get the list on your clipboard
(Can you tell I’m dogfooding the product here?)
We used a few cool technologies for this project:
🖥️ @opentui/corefor the terminal UI
🤖 @github/copilot-sdkfor the AI brain
📋 clipboardyfor clipboard access
To start the project off, we opened up the GitHub Copilot CLI.
In plan mode using Claude Sonnet 4.6, we wrote:
I want to create an AI-powered markdown emoji list generator. Where, in this CLI app, if I paste in or write in some bullet points, it will replace those bullet points with relevant emojis to the given point in that list, and copies it to my clipboard. I'd like it to use GitHub Copilot SDK for the AI juiciness.Copilot asked me a bunch of clarifying questions, for example around the tech stack and what libraries we should use (shoutout to Gabor in the chat for suggesting OpenTUI), and from there, we had a fully thought-out plan.mdfile for me to review and use!
We implemented the plan using Claude Opus 4.7 (which was recently released!) and a few minutes later, voilà, we had a fun little terminal UI to work with!
The project was small but mighty. In the CLI, we used some really cool tools all together:
📋 Plan mode
🤖 Autopilot mode
🔀 Multi-model workflow
🚩 The allow-alltools flag
🐙 The GitHub MCP server
If you’d like to build a project like this yourself, you can check out the docs for the GitHub Copilot CLI and the GitHub Copilot SDK today!
The emoji list generator is free and open source, just for you.
Happy building!
Cassidy is senior director for developer advocacy here at GitHub. She enjoys building software, advising startups, and teaching developers how to build better. She has a weekly newsletter at cassidoo.co/newsletter where you can get her updates, practice coding problems, and a joke in your inbox!
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