The difference between Claude Code sessions that ship and ones that don't

The difference between Claude Code sessions that ship and ones that don't I've run a lot of sessions. Some ship. Some don't. The difference isn't the complexity of the task or whether the agent made mistakes - it's whether certain conditions were in place before I started. Sessions that ship have a defined output Not "improve the auth system." Something like: "Add JWT validation middleware to /routes/api.js that returns 401 for missing tokens and 403 for expired ones, with tests for both cases." The specific the output definition, the likely the session ships.