diff --git a/.changeset/recipe-boolean-variants.md b/.changeset/recipe-boolean-variants.md
new file mode 100644
index 00000000..e07f8c81
--- /dev/null
+++ b/.changeset/recipe-boolean-variants.md
@@ -0,0 +1,10 @@
+---
+"@styleframe/runtime": minor
+"@styleframe/transpiler": minor
+"styleframe": minor
+---
+
+Add boolean support for recipe variant props
+
+- When a variant defines both `true` and `false` keys, the runtime now accepts boolean `true`/`false` values in addition to string `"true"`/`"false"`
+- Generated `.d.ts` type declarations include `| boolean` in the type union for boolean variants
diff --git a/engine/runtime/src/runtime.test.ts b/engine/runtime/src/runtime.test.ts
index e8fc62a1..ddc9cd9e 100644
--- a/engine/runtime/src/runtime.test.ts
+++ b/engine/runtime/src/runtime.test.ts
@@ -586,6 +586,98 @@ describe("createRecipe", () => {
 		expect(result).not.toContain("button--disabled");
 	});
 
+	it("should accept boolean true to select 'true' variant option", () => {
+		const runtime = {
+			variants: {
+				disabled: {
+					true: { opacity: "50" },
+					false: { opacity: "100" },
+				},
+			},
+			defaultVariants: {
+				disabled: "false",
+			},
+		} as const satisfies RecipeRuntime;
+
+		const button = createRecipe("button", runtime);
+		const result = button({ disabled: true });
+
+		expect(result).toContain("_opacity:50");
+	});
+
+	it("should accept boolean false to select 'false' variant option", () => {
+		const runtime = {
+			variants: {
+				disabled: {
+					true: { opacity: "50" },
+					false: { opacity: "100" },
+				},
+			},
+			defaultVariants: {
+				disabled: "true",
+			},
+		} as const satisfies RecipeRuntime;
+
+		const button = createRecipe("button", runtime);
+		const result = button({ disabled: false });
+
+		expect(result).toContain("_opacity:100");
+	});
+
+	it("should match boolean true in compound variant conditions", () => {
+		const runtime = {
+			variants: {
+				color: {
+					primary: {},
+				},
+				disabled: {
+					true: {},
+					false: {},
+				},
+			},
+			defaultVariants: {
+				color: "primary",
+				disabled: "false",
+			},
+			compoundVariants: [
+				{
+					match: { color: "primary", disabled: "true" },
+					css: {
+						opacity: "50",
+					},
+					className: "button--primary-disabled",
+				},
+			],
+		} as const satisfies RecipeRuntime;
+
+		const button = createRecipe("button", runtime);
+		const result = button({ disabled: true });
+
+		expect(result).toContain("_opacity:50");
+		expect(result).toContain("button--primary-disabled");
+	});
+
+	it("should not fall through to defaultVariants when boolean false is provided", () => {
+		const runtime = {
+			variants: {
+				disabled: {
+					true: { opacity: "50" },
+					false: { opacity: "100" },
+				},
+			},
+			defaultVariants: {
+				disabled: "true",
+			},
+		} as const satisfies RecipeRuntime;
+
+		const button = createRecipe("button", runtime);
+		// boolean false should select "false" variant, not fall through to default "true"
+		const result = button({ disabled: false });
+
+		expect(result).toContain("_opacity:100");
+		expect(result).not.toContain("_opacity:50");
+	});
+
 	it("should handle compound variant with both css and className", () => {
 		const runtime = {
 			variants: {
diff --git a/engine/runtime/src/runtime.ts b/engine/runtime/src/runtime.ts
index cc3a481f..996ae4a1 100644
--- a/engine/runtime/src/runtime.ts
+++ b/engine/runtime/src/runtime.ts
@@ -45,6 +45,22 @@ function toClassName(
  * @param value - The value to check
  * @returns True if the value is a modifier block
  */
+/**
+ * Resolves a variant value from props, coercing booleans to strings.
+ * Falls back to defaultVariants if the prop is not provided.
+ */
+function resolveVariantValue(
+	props: Record<string, string | boolean>,
+	variantKey: string,
+	defaultVariants?: Record<string, string>,
+): string | undefined {
+	const raw = props[variantKey];
+	return (
+		(raw !== undefined ? String(raw) : undefined) ??
+		defaultVariants?.[variantKey]
+	);
+}
+
 function isModifierBlock(
 	value: RuntimeVariantDeclarationsValue,
 ): value is RuntimeModifierDeclarationsBlock {
@@ -151,11 +167,11 @@ export function createRecipe<R extends RecipeRuntime>(
 				runtime.variants,
 			)) {
 				// Get the selected variant value from props or defaultVariants
-				const selectedVariant =
-					(props as Record<string, string>)[variantKey] ??
-					runtime.defaultVariants?.[
-						variantKey as keyof typeof runtime.defaultVariants
-					];
+				const selectedVariant = resolveVariantValue(
+					props as Record<string, string | boolean>,
+					variantKey,
+					runtime.defaultVariants as Record<string, string> | undefined,
+				);
 
 				const options = variantOptions as RuntimeVariantOptions;
 				const declarations = selectedVariant
@@ -179,11 +195,11 @@ export function createRecipe<R extends RecipeRuntime>(
 					compoundVariant.match,
 				)) {
 					// Get the selected variant value from props or defaultVariants
-					const selectedVariant =
-						(props as Record<string, string>)[variantKey] ??
-						runtime.defaultVariants?.[
-							variantKey as keyof typeof runtime.defaultVariants
-						];
+					const selectedVariant = resolveVariantValue(
+						props as Record<string, string | boolean>,
+						variantKey,
+						runtime.defaultVariants as Record<string, string> | undefined,
+					);
 
 					if (selectedVariant !== variantValue) {
 						allConditionsMatch = false;
diff --git a/engine/runtime/src/types.ts b/engine/runtime/src/types.ts
index 5f74183d..72a2036d 100644
--- a/engine/runtime/src/types.ts
+++ b/engine/runtime/src/types.ts
@@ -44,7 +44,11 @@ export type RecipeVariantProps<R> = R extends {
 			: // Specific type with literal keys - extract exact variant keys and options
 				{
 					[K in keyof V]?: V[K] extends Record<string, unknown>
-						? keyof V[K] & string
+						? "true" extends keyof V[K]
+							? "false" extends keyof V[K]
+								? (keyof V[K] & string) | boolean
+								: keyof V[K] & string
+							: keyof V[K] & string
 						: never;
 				}
 		: Record<string, string>
diff --git a/engine/transpiler/src/consume/dts/recipe.test.ts b/engine/transpiler/src/consume/dts/recipe.test.ts
new file mode 100644
index 00000000..77348008
--- /dev/null
+++ b/engine/transpiler/src/consume/dts/recipe.test.ts
@@ -0,0 +1,108 @@
+import type { Root, StyleframeOptions } from "@styleframe/core";
+import {
+	createRecipeFunction,
+	createRoot,
+	createUtilityFunction,
+} from "@styleframe/core";
+import { createRecipeConsumer } from "./recipe";
+
+describe("createRecipeConsumer (dts)", () => {
+	const mockConsume = vi.fn();
+	const consumeRecipe = createRecipeConsumer(mockConsume);
+	const options: StyleframeOptions = {};
+
+	let root: Root;
+	let recipe: ReturnType<typeof createRecipeFunction>;
+	let utility: ReturnType<typeof createUtilityFunction>;
+
+	beforeEach(() => {
+		mockConsume.mockClear();
+		root = createRoot();
+		recipe = createRecipeFunction(root, root);
+		utility = createUtilityFunction(root, root);
+	});
+
+	it("should include boolean in type union when variant has both true and false keys", () => {
+		utility("opacity", ({ value }) => ({ opacity: value }));
+
+		const instance = recipe({
+			name: "button",
+			base: {},
+			variants: {
+				disabled: {
+					true: { opacity: "50%" },
+					false: { opacity: "100%" },
+				},
+			},
+		});
+
+		const result = consumeRecipe(instance, options);
+
+		expect(result).toContain('disabled?: "true" | "false" | boolean');
+	});
+
+	it("should not include boolean when variant has only true key", () => {
+		utility("borderRadius", ({ value }) => ({ borderRadius: value }));
+
+		const instance = recipe({
+			name: "button",
+			base: {},
+			variants: {
+				rounded: {
+					true: { borderRadius: "full" },
+				},
+			},
+		});
+
+		const result = consumeRecipe(instance, options);
+
+		expect(result).toContain('rounded?: "true"');
+		expect(result).not.toContain("boolean");
+	});
+
+	it("should not include boolean for normal string variants", () => {
+		utility("padding", ({ value }) => ({ padding: value }));
+
+		const instance = recipe({
+			name: "button",
+			base: {},
+			variants: {
+				size: {
+					sm: { padding: "1rem" },
+					md: { padding: "2rem" },
+					lg: { padding: "3rem" },
+				},
+			},
+		});
+
+		const result = consumeRecipe(instance, options);
+
+		expect(result).toContain('size?: "sm" | "md" | "lg"');
+		expect(result).not.toContain("boolean");
+	});
+
+	it("should handle mix of boolean and string variants", () => {
+		utility("opacity", ({ value }) => ({ opacity: value }));
+		utility("padding", ({ value }) => ({ padding: value }));
+
+		const instance = recipe({
+			name: "button",
+			base: {},
+			variants: {
+				disabled: {
+					true: { opacity: "50%" },
+					false: { opacity: "100%" },
+				},
+				size: {
+					sm: { padding: "1rem" },
+					md: { padding: "2rem" },
+				},
+			},
+		});
+
+		const result = consumeRecipe(instance, options);
+
+		expect(result).toContain('disabled?: "true" | "false" | boolean');
+		expect(result).toContain('size?: "sm" | "md"');
+	});
+});
diff --git a/engine/transpiler/src/consume/dts/recipe.ts b/engine/transpiler/src/consume/dts/recipe.ts
index 3fc6878a..c4fa6fef 100644
--- a/engine/transpiler/src/consume/dts/recipe.ts
+++ b/engine/transpiler/src/consume/dts/recipe.ts
@@ -19,7 +19,12 @@ function generateVariantPropsType(runtime: Recipe["_runtime"]): string {
 		const optionKeys = Object.keys(variantOptions);
 		if (optionKeys.length > 0) {
 			const optionUnion = optionKeys.map((k) => `"${k}"`).join(" | ");
-			entries.push(`${variantKey}?: ${optionUnion}`);
+			const isBooleanVariant =
+				optionKeys.includes("true") && optionKeys.includes("false");
+			const typeUnion = isBooleanVariant
+				? `${optionUnion} | boolean`
+				: optionUnion;
+			entries.push(`${variantKey}?: ${typeUnion}`);
 		}
 	}