SKILL: Negative Prompt Library

Version: 1.0 | Hermes Agent SD Prompt Craft (Technical)

DESCRIPTION

Comprehensive artifact suppression libraries organized by workflow type. Negative prompts act as soft constraints — the model assigns lower weight to excluded features [^73^]. However, Flux is guidance-distilled and does not natively support negative prompts [^57^]; LTX video uses guardrails rather than traditional negatives [^68^]; while SDXL/z_image rely heavily on negative prompt fields for quality control [^56^][^65^]. This skill provides per-workflow negative strategies.

TRIGGER KEYWORDS

negative prompt, negative prompt library, artifact suppression, quality negative, bad anatomy negative, what to avoid, suppression vocabulary, SDXL negatives, Flux workaround, guardrails, LTX negative, negative terms

CORE RULES

• Flux has no native negative prompt — use positive reframing: "correct anatomy" not "no bad anatomy"
• SDXL: minimal negatives beat maximal ones — overloading degrades overall quality
• LTX video uses "guardrails" field, not traditional negatives
• Never use vague negatives: "bad quality" less effective than "blurry, jpeg artifacts, low resolution"
• Model-specific anatomy negatives for SDXL: "bad anatomy, poorly drawn hands, deformed, extra limbs"
• Quality baseline for SDXL: "worst quality, low quality, normal quality" as starter suppression
• Negative prompts degrade gracefully: too many negatives = muddier output, not cleaner