Codex - AI-Powered GitHub Explorer

Slash repository onboarding time with AI-powered code insights in Chrome

Inspiration

We noticed that developers spend significant time trying to understand new codebases when onboarding to projects. With Chrome's new built-in AI capabilities through Gemini Nano, we saw an opportunity to create a tool that could help developers quickly grasp repository architecture and code functionality directly in their browser.

What it does

Codex is a Chrome extension that leverages Chrome's built-in AI (Gemini Nano) to help developers understand GitHub repositories. It provides:

• Instant repository summaries including architecture and setup requirements
• Code file explanations with context-aware analysis
• Interactive AI chat for deeper understanding
• All processing happens locally in Chrome - no external APIs needed

How we built it

• Used Chrome Extensions framework with Manifest V3
• Integrated Chrome's new Prompt API to access Gemini Nano
• Implemented file analysis for both single files and repository-wide context
• Created an intuitive UI that matches Chrome's design language
• Built privacy-first architecture keeping all processing local

Challenges we ran into

• Working with experimental Chrome AI features that are still in development
• Managing the complex requirements for Gemini Nano (storage, GPU, etc.)
• Designing an intuitive UI that works seamlessly with GitHub's interface
• Handling large codebases while maintaining performance
• Balancing between detailed analysis and quick response times

Accomplishments that we're proud of

• Created one of the first extensions using Chrome's built-in AI capabilities
• Developed a privacy-focused solution that processes everything locally
• Built an intuitive interface that feels native to Chrome
• Implemented context-aware code analysis
• Achieved significant reduction in repository onboarding time

What we learned

• How to work with Chrome's new AI APIs
• Best practices for Chrome extension development
• Techniques for processing and analyzing code repositories
• Importance of user experience in developer tools
• Balancing feature scope with performance

What's next for Codex

• Support for more programming languages and frameworks
• Enhanced repository analysis with dependency tracking
• Integration with more GitHub features
• Team collaboration features
• Performance optimizations for larger codebases
• Support for private repositories

Built With

• chrome
• javascript
• prompt-api