After the first output, you're an editor — not a conversation partner. Redirect, refine, or approve. Don't explore.
✕ The exploration trap
Claude gives output → "Interesting, what about X?" → Claude expands → "Hmm, and what about Y?" → Claude adds more → 45 minutes later you have a rich discussion but no usable artifact
✓ The checkpoint version
Claude gives output → You evaluate against your contract → "Points 1-3 are strong. Point 4 misses [specific thing] — revise to account for [constraint]. Point 5: replace with [your idea]. Then give me the final version."
Rules
React to the output, not the topic. Your job after message 1 is editorial: what's right, what's wrong, what's missing. Stay concrete.
Use directive language. "Revise point 4," "Cut section 2," "Add a row for timeline." Not "what do you think about..." or "could you maybe..."
Batch your feedback. Give all corrections in one message, not one per round. Each round-trip costs you context and time.
Know when to stop. If it's 80% right, take it and polish manually. Chasing the last 20% through prompting often takes longer than fixing it yourself.