I built a self-evolving AI skill engine as a solo dev using 4 AI models

What is Cambrian? An AI skill engine where skills get better the more you use them. Every AI tool runs the same prompts forever. Cambrian is different: Give feedback → LLM mutates the skill 3-trial benchmark → LLM Judge blind-scores A/B Better version survives, worse one dies After 10 rounds, the skill is personalized to YOUR workflow How I built it Solo Korean developer. 4 AI models in relay: Claude Opus → architecture & critical thinking (40 rounds of self-critique) GPT → code generation Claude Sonnet → implementation & debugging Gemini → review The project itself was evolved through its own philosophy: feedback → improve → test → repeat. Key features 3-channel feedback: auto (failure analysis), critic (proactive review), manual LLM Judge: blind A/B scoring (0-10) with reasoning Competitive execution: same domain, best skill wins Multi-provider: Claude, GPT, Gemini — not locked to one platform Skill decay: 30 days unused → dormant, 90 days → fossil Export/import: portable .ca