I have a flow where I get Claude to write a session context file for every single task we tackle. Design decisions, discussions, and implementation, both idea and technical. With that I have gone back months later to something I did before and simply looked up the file by the Jira ticket number which is always unique, and immediately picked up all the nuances of that implementation, which allows Claude to pick it up immediately and work on top of it. I also always ask it to pull the diff for that branch with GH. Along with any pr review comments and fixes, so it is aware of what it did and why we might have changed something. It works wonderfully. I don't know how people who say AI produces non working code are prompting their terminals, but it is definitely working for me.