A developer built a VSCode extension that generates 5-7-5 haiku commit messages from staged git changes, learning by building instead of reading scattered docs. The project, called 575 Haiku Commit, uses a simple keyboard shortcut to transform code changes into poetry. While the haiku feature is fun, the real goal was understanding how VSCode extensions actually work under the hood.

Building the extension revealed several surprising insights about the platform. Commands are simpler than expected, but Source Control integration has quirks that require working with VSCode's git extension API. The configuration system is powerful yet verbose, needing extensive package.json definitions for API keys and provider selection. Error handling proved critical since AI APIs frequently hit rate limits or timeout, requiring retry logic with corrective guidance.

The developer structured the entire codebase as a learning resource, complete with step-by-step guides in docs/GUIDES.md covering command registration, keyboard shortcuts, and multi-provider AI integration. This represents the first of many planned 'build to learn' projects, demonstrating that hands-on coding teaches more than documentation alone. The MIT-licensed repository invites others to clone, break, and build their own extensions.