§ VALIDATION · RED

MISSING_UNDERLAY

The selected stitch strategy is missing underlay required for stable sewing.

Stitch setupDeterministic rule
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What it means

The selected stitch strategy is missing underlay required for stable sewing.

Why it matters

Without underlay, many fabrics distort and surface stitch quality suffers.

Common triggers

  • satin on unstable fabric
  • dense fills on stretchy material
  • operator omitted underlay defaults

Typical fixes

  • add underlay
  • switch to a more suitable preset
  • change fabric/setup context

Notes

  • Base rule family; context-sensitive variant documented separately as MISSING_UNDERLAY_FOR_FABRIC.

Plan references

  • plan/05-validation.md
  • plan/57-context-aware-validation-matrix.md