diff --git a/scratch/reviewbot-unified-demo.ts b/scratch/reviewbot-unified-demo.ts
new file mode 100644
index 0000000000..ad9e513fee
--- /dev/null
+++ b/scratch/reviewbot-unified-demo.ts
@@ -0,0 +1,19 @@
+// Small numeric helpers.
+
+/** Clamp a percentage into the 0–100 range. */
+export function clampPercent(value: number): number {
+  if (value > 100) {
+    return 100;
+  }
+  return value;
+}
+
+/** Return the average of the numbers. */
+export function average(values: number[]): number {
+  return values.reduce((a, b) => a + b, 0) / values.length;
+}
+
+/** Parse a port number from a string, defaulting to 8080. */
+export function parsePort(raw: string): number {
+  return parseInt(raw) || 8080;
+}