GitHub shares how staff software engineer Brittany Ellich built a personal “productivity hub” using GitHub Copilot CLI, including an AI chat agent (“Marvin”), unified task lists, and calendar integrations, with the goal of learning by building your own AI tools.

How a GitHub engineer built an AI productivity hub with Copilot CLI

Overview

Meet Brittany Ellich, a Staff Software Engineer at GitHub, and see a custom productivity tool she built using the GitHub Copilot CLI.

The core idea: since she prefers a visual interface over working directly in a terminal, she used GitHub Copilot to “vibe code” a personalized command center.

What she built

Her app includes:

• An AI chat agent named Marvin
• Unified task lists (a single place to view/manage tasks)
• Calendar integrations (bringing calendar context into the hub)

Why this approach

The video’s takeaway is that building your own AI tools can be one of the fastest ways to learn (because you have to make concrete product choices and integrate real capabilities rather than just trying demos).

Project link

Her project is described as open source:

• https://github.com/features/copilot/cli?utm_source=social-youtube-build-a-game-cli-features-cta&utm_medium=social&utm_campaign=dev-pod-copilot-cli-2026

Source and hashtags

• #GitHubCopilot
• #CopilotCLI
• #VibeCoding