figma-style-binding

Style Binding + QA

Every visual value must come from the design system. Supplements figma-generate-design. Prerequisite: figma-preflight must have run this session.

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Binding Hierarchy

For any visual property, follow this order. Stop at the first match.

1. Connected Library  →  search_design_system → import → apply
2. Local Style        →  Style Registry → apply by ID
3. Local Variable     →  Variable Registry → apply by ID
4. Gap found          →  Report to user, wait for decision

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Text

Every text node must use textStyleId. Individual font properties (fontSize, fontFamily, etc.) are forbidden.

const style = await figma.getStyleByIdAsync("<id>");
await figma.loadFontAsync(style.fontName);
node.textStyleId = "<id>";

If no local style matches, search libraries via search_design_system. If no match anywhere:

⚠️ Text style gap: no style for "[role]". Available: [top 5]. Use closest, or add missing style?

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Color Fills

Every fill/stroke must bind to a COLOR Variable (preferred, supports theming) or Paint Style.

// Variable binding (preferred)
const variable = await figma.variables.getVariableByIdAsync("<id>");
const fill = { type: "SOLID", color: { r: 0, g: 0, b: 0 } };
node.fills = [figma.variables.setBoundVariableForPaint(fill, "color", variable)];

// Paint Style binding
node.fillStyleId = "<id>";

Never use raw { r, g, b } without a binding.

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Spacing, Padding, Gap, Radius

Bind to FLOAT Variables. layoutMode must be set BEFORE setBoundVariable.

node.setBoundVariable("paddingTop", spacingVar);
node.setBoundVariable("paddingBottom", spacingVar);
node.setBoundVariable("paddingLeft", spacingVar);
node.setBoundVariable("paddingRight", spacingVar);
node.setBoundVariable("itemSpacing", spacingVar);
node.setBoundVariable("cornerRadius", radiusVar);

Spacing can fall back to raw values temporarily with user confirmation. Color and text cannot.

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Forbidden / Required

Forbidden	Required
node.fontSize = 24	node.textStyleId = id
node.fills = [{ type: "SOLID", color: { r: .2, g: .4, b: 1 } }]	Variable or Style binding
node.paddingLeft = 16	node.setBoundVariable("paddingLeft", var)
node.cornerRadius = 8	node.setBoundVariable("cornerRadius", var)
Creating a Button from scratch	importComponentByKeyAsync from library

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QA Verification

After every use_figma call that creates or modifies nodes, run this verification on the returned node IDs:

const nodeIdsToAudit = [/* paste returned IDs */];
const results = [];

for (const id of nodeIdsToAudit) {
  const node = await figma.getNodeByIdAsync(id);
  if (!node) { results.push({ id, status: "NOT_FOUND" }); continue; }

  const checks = [];

  if (node.type === "TEXT") {
    checks.push({ prop: "textStyleId", bound: !!node.textStyleId });
  }

  if ("fills" in node && Array.isArray(node.fills) && node.fills.length > 0) {
    const bound = !!node.fillStyleId || (node.boundVariables?.fills?.length > 0);
    checks.push({ prop: "fills", bound });
  }

  if ("layoutMode" in node && node.layoutMode !== "NONE") {
    for (const p of ["paddingLeft","paddingRight","paddingTop","paddingBottom","itemSpacing"]) {
      if (p in node) checks.push({ prop: p, bound: !!(node.boundVariables && p in node.boundVariables) });
    }
  }

  if ("cornerRadius" in node && node.cornerRadius > 0) {
    checks.push({ prop: "cornerRadius", bound: !!(node.boundVariables && "cornerRadius" in node.boundVariables) });
  }

  const failed = checks.filter(c => !c.bound);
  results.push({ id, name: node.name, type: node.type, status: failed.length === 0 ? "PASS" : "FAIL", failed: failed.map(c => c.prop) });
}

return { auditResults: results };

If FAIL: Fix each unbound property using the binding rules above, then re-audit. Do not proceed to the next design step until all pass.

Report format:

✅ All [N] nodes passed.
// or
❌ FAIL "Card" (FRAME) — paddingTop, cornerRadius unbound. Fixing...