Feeding them the docs makes a huge difference in my experience. The docs might be somewhere in the training set, but telling the LLM explicitly "Use these docs

Feeding them the docs makes a huge difference in my experience. The docs might be somewhere in the training set, but telling the LLM explicitly "Use these docs before anything else" solves a lot of problems the the LLM mixing up different versions of a library or confusing two different libraries with a similar API.