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diff --git a/tools/shadertoy/template.h b/tools/shadertoy/template.h
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+// This file is part of the 64k demo project.
+// ShaderToy effect boilerplate - REPLACE THIS LINE WITH DESCRIPTION
+// TODO: Update description, rename class, adjust parameters
+
+#ifndef SHADERTOY_EFFECT_H_
+#define SHADERTOY_EFFECT_H_
+
+#include "gpu/effect.h"
+#include "gpu/effects/post_process_helper.h"
+#include "gpu/uniform_helper.h"
+
+// TODO: Rename class to match your effect (e.g., TunnelEffect, PlasmaEffect)
+class ShaderToyEffect : public Effect {
+ public:
+  // TODO: Add constructor parameters for tunable values
+  ShaderToyEffect(const GpuContext& ctx);
+  ~ShaderToyEffect() override;
+
+  void init(MainSequence* demo) override;
+  void render(WGPURenderPassEncoder pass, float time, float beat,
+              float intensity, float aspect_ratio) override;
+
+ private:
+  // TODO: Add effect-specific parameters here
+  // Must match WGSL struct exactly - use padding for 16-byte alignment
+  struct ShaderToyParams {
+    float param1;
+    float param2;
+    float _pad[2];  // Padding to 16 bytes
+  };
+  static_assert(sizeof(ShaderToyParams) == 16,
+                "ShaderToyParams must be 16 bytes for WGSL alignment");
+
+  MainSequence* demo_ = nullptr;
+  WGPURenderPipeline pipeline_ = nullptr;
+  WGPUBindGroup bind_group_ = nullptr;
+  WGPUSampler sampler_ = nullptr;
+  UniformBuffer<ShaderToyParams> params_;
+};
+
+#endif /* SHADERTOY_EFFECT_H_ */