diff --git a/tools/log.ts b/tools/log.ts
new file mode 100644
index 0000000..54ba25d
--- /dev/null
+++ b/tools/log.ts
@@ -0,0 +1,19 @@
+/**
+ * A logging utility designed to be inserted into functional chains.
+ * Logs all parameters with an optional prefix, then returns the first argument unchanged.
+ *
+ * @param {string} [prefix=''] - A label or message to prepend to the logged output.
+ * @returns {(value: any, ...rest: any[]) => any} - A function that logs its arguments and returns the first one.
+ *
+ * @example
+ * const result = [1, 2, 3]
+ *   .map((n) => n * 2)
+ *   .map(log('doubled:'))
+ *   .filter((n) => n > 2);
+ */
+export const log =
+	(prefix: string = ''): ((value: any, ...rest: any[]) => any) =>
+	(...args: any[]) => {
+		console.log(prefix, ...args);
+		return args[0];
+	};