Summary
Web Dev Cody walks through how he built Nebula — a custom agentic development environment with over 85,000 lines of Rust — despite having zero experience with the language. Using Claude Fable 5 (via Claude Code) as his primary coding agent, Cody demonstrates that experienced developers can ship complex, production-quality software in unfamiliar languages through deliberate prompting strategies and tight iterative workflows.
Nebula is a terminal UI application designed around the workflow Cody sees daily in professional engineering teams: concurrent agent sessions running in isolated Git work trees, automated pull request creation, cross-project navigation, and status tracking for long-running tasks. The video covers how Cody decides what features to build (weekly usage-driven friction lists), how he validates changes (using the app himself before shipping), and how he gates experimental features to avoid product bloat.
For prompting, Cody recommends a who/what/when/where/why/how framing and emphasizes describing problems as if explaining them verbally to someone who cannot see your screen. He also shares his release cadence: accumulate a week of friction, batch the fixes into agent sessions on work trees, verify each change, archive completed sessions, then cut a release. The video is a rare detailed account of maintaining a substantial AI-authored codebase in production and is directly applicable to anyone building with Claude Code or similar agentic coding tools.
📺 Source: Web Dev Cody · Published September 14, 2026
🏷️ Format: Hands On Build
