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diff --git a/tools/shadertoy/example.txt b/tools/shadertoy/example.txt
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+// Example ShaderToy shader for testing convert_shadertoy.py
+// Simple animated gradient effect
+//
+// Test with:
+//   ./tools/shadertoy/convert_shadertoy.py tools/shadertoy/example.txt Rainbow
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord) {
+    // Normalized pixel coordinates (from 0 to 1)
+    vec2 uv = fragCoord / iResolution.xy;
+
+    // Center coordinates
+    vec2 center = uv - 0.5;
+
+    // Distance from center
+    float dist = length(center);
+
+    // Animated rainbow colors
+    vec3 col = 0.5 + 0.5 * cos(iTime + dist * 10.0 + vec3(0.0, 2.0, 4.0));
+
+    // Pulsing effect
+    col *= 1.0 + 0.2 * sin(iTime * 2.0);
+
+    // Output to screen
+    fragColor = vec4(col, 1.0);
+}