My Coding Agent Remembered My Mistakes I Never Told It To

The author built CodeMentor AI, an AI-powered coding practice mentor at HackWithIndia 2026, featuring a Monaco Editor with LeetCode-style problems and an AI chat mentor. The key innovation is integrating Hindsight's memory layer with Groq's llama-3.3-70b model, enabling the AI mentor to remember users' past mistakes and weak spots across sessions instead of treating every interaction as a fresh start. Previous approaches like localStorage-based chat history failed due to token bloat, but Hindsight's retain() operation allows storing structured summaries of each submission for smarter, selective context retrieval.