Planet Argon engineers share field notes from using Claude Code on real, long-lived Ruby on Rails client projects. Key findings include significantly reduced debugging time (from ~45 minutes to ~10 minutes), practical guidance on model selection (Sonnet vs Opus), RSpec and Minitest workflows, debugging with error monitoring payloads, and structuring CLAUDE.md files effectively. The writeup targets skeptical-but-curious Rails developers rather than AI enthusiasts.
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