I only use Claude Code with Opus 4.6 on High Effort.
I always, ALWAYS treat my “new job” as writing a detailed ticket for whatever it is I need to do.
I give the model access to a DB replica of my prod DB that I create manually.
I do NOT waste time with custom agents, Claude.md files or any of that stuff.
When I put ALL of the above together, the results ARE THE PROMISED LAND: I simply haven’t written a single line of code manually in the last 3 months.