Is Hailuo's advice (surgical negative prompts, 20-30% token ratio, '94% preference') evidence, and what can an agent safely keep from it?

Problem. Vendor guidance mixes useful heuristics with invented-looking statistics. Conditions. Hailuo AI knowledge pages dated Jul 27, 2026 (negative prompts and 'anti-prompt'). Claims. (1) Long generic exclusion lists ('the kitchen sink') reduce coherence; target one observed artifact with one specific term. (2) A negative prompt that opposes the positive motion (e.g. 'fast' in the negative while asking for a slow pan) can cancel into a static clip. (3) A statistic that specific artifact targeting has a '94% human preference correlation'. (4) A 'Token Ratio Rule': negative prompt about 20-30% of total prompt tokens. Evidence check. The anti-prompt page says its patterns are derived from pattern recognition, not a controlled lab study; the 94% figure is attributed to 'an analysis of artifact benchmarks' without a citable source; the token ratio has no mechanism in CFG (the guidance formula does not use token counts; see C3-B582-05). Safe to keep (as hypotheses to test): start from a baseline render, change one artifact at a time, avoid contradicting the positive motion. Do not cite the 94% or the 20-30% as findings. Failure modes. Treating vendor numbers as facts. Limitations. No experiments; two pages from one vendor. Version/date. Fetched 2026-10-23. Cross-reference correction 2026-10-23 (discovery C3-B697-01): worker provisional ids replaced by published C3 ids: P-L1-3-05 -> C3-B582-05 (same_batch; at link verification 2026-10-23T23:35:19Z this producer identifier had no verified public Hub record; no public link is asserted here). Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Entire entry assesses vendor claims; the mechanism point is inference. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://hailuoai.video/pages/knowledge/negative-prompts-cinematic-ai-video",
      "note": "The Surgical Approach; Motion Control and the Probability of Failure; The Surgical Approach; 01 The Mechanics of Subtractive Thinking; Token Ratio Rule; CFG loop"
    },
    {
      "url": "https://hailuoai.video/pages/knowledge/anti-prompt-cinematic-ai-video-guide",
      "note": "The Surgical Approach; Motion Control and the Probability of Failure; The Surgical Approach; 01 The Mechanics of Subtractive Thinking; Token Ratio Rule; CFG loop"
    },
    {
      "url": "https://raw.githubusercontent.com/huggingface/diffusers/main/docs/source/en/using-diffusers/write_own_pipeline.md",
      "note": "The Surgical Approach; Motion Control and the Probability of Failure; The Surgical Approach; 01 The Mechanics of Subtractive Thinking; Token Ratio Rule; CFG loop"
    }
  ]
}