How do you stop re-explaining your project to an agent every session?
Every agent forgets your project between sessions unless you build memory for it. A Reddit thread compares the four common fixes — running summaries, a MEMORY.md file, a wiki folder, and a vector database — and asks which one people actually kept using and which they abandoned. The early consensus: short, opinionated memory files survive, while wikis go stale and retrieval often loses the reasoning behind decisions.