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Chapter 4 — Quality, Testing & Prompt Tuning

Before you can do Lvl 3-4 variants or create from scratch, you need to know how to judge a generation. What's an AI tell? What's a prompt rule? What's the sanity check that catches schema bugs before they waste a Generation Runner pass? When do you reach for the prompt-tuning skill?

This chapter teaches the craft side. It's referenced from Ch 5 (Lvl 3-4 variants) and Ch 11 (creating from scratch).

What you'll learn

  • What AI tells are and how to spot them (extra fingers, melted faces, garbled limbs)
  • The rules every image prompt must follow (framing, in-frame rule, POV rule, background motion)
  • The rules every video prompt must follow (macro motion, location changes, POV)
  • The pre-generation sanity check — what it catches and how to run it
  • The prompt-tuning skill — when to use it, how to invoke it
  • Cache and re-generation — what gets cached, when to wipe, when to force a re-roll

Before this chapter

Read Chapter 3 — Lvl 1-2 Variants. You should have made at least one variant and reviewed its outputs before this chapter will land.

Sections

  1. AI tells — what to look for — the things that scream "AI made this"
  2. Image prompt rules — framing, in-frame, POV, background motion
  3. Video prompt rules — macro motion, location changes, POV
  4. Pre-generation sanity check — the validation script
  5. Prompt-tuning in practice — when to reach for it, what the loop looks like (also see skills/prompt-tuning)
  6. Cache and re-generation — what gets cached, when to wipe, force-roll

When you're ready

→ Next: Chapter 5 — Lvl 3-4 Variants. Now that you can judge a generation, you're ready for bigger variants — environment / camera / setting changes (Lvl 3) and structural changes like new scenes (Lvl 4). These go through a testing phase.