Scanned 49 vibe-coded GitHub projects for code duplication. Found that AI skill libraries - not AI apps - have the highest duplication rates, up to 37%.

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I ran jscpd against 49 vibe-coded GitHub projects looking for code duplication patterns. Average duplication: 7.98% (above the 3-5% industry benchmark). But the unexpected finding wasn't in the apps — it was in the skill libraries built to teach AI agents how to code. Those have 30-40% duplication rates, mostly in markdown instructions and CSS templates duplicated for different agent platforms. The infrastructure designed to enforce AI discipline embodies the same pattern it's trying to prevent.