The Karpathy reference is apt — personal knowledge bases are becoming the secret weapon for anyone working with LLMs. I've been building something similar for my automation consulting: every client project, workflow pattern, and debugging session gets logged in a structured way that I can feed into Claude as context. The compounding effect is real — after 6 months, my system prompts are significantly better because they draw on actual project outcomes rather than generic best practices. What tools are you using for the knowledge capture layer?