A developer shares their experience revisiting custom AI guidelines for Laravel and Filament projects in 2026. After vibe-coding two projects without custom guidelines and having Claude Code evaluate the results against those guidelines, they found that some rules (like folder preferences or helper vs facade) are now minor or irrelevant as models have improved, but others remain critical — particularly enforcing Filament smoke tests, custom Tailwind themes, and enum interface implementations. The conclusion is to trim guidelines down to only the high-impact rules that AI models still consistently miss, avoiding unnecessary noise in prompts.
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