Your requirements live in a chat window
Six rules from fifteen real OpenSpec changes for writing project docs an agent can't misread, including the one that says a proposal is allowed to fail.
Tools & artefacts
Two hooks that hold every time, and what breaks them
Two Claude Code hooks that block bad Swift before it ships, the exit-code contract behind them, and a subshell bug that let one through anyway.
What survives of prompt engineering
I taught prompt writing twice, then measured where the gain was. Three techniques survived agentic work; the rest was decoration.