> I once again ask Claude Code to fix the bug, this time including the little bit I learned in #3. Claude Code fixes the problem in one round.

Context is king, which makes sense since LLM output is based on probability. The more context you can provide it, the more aligned the output will be. It's not like it magically learned something new. Depending on the problem, you may have to explain exactly what you want. If the problem is well understood, a sentence would most likely be suffice.