diff --git a/tools/is_armstrong.py b/tools/is_armstrong.py
new file mode 100644
index 0000000..2f2e445
--- /dev/null
+++ b/tools/is_armstrong.py
@@ -0,0 +1,24 @@
+# tool: is_armstrong
+# description: Checks if a number is an Armstrong number.
+# author: @navaneethsankar07
+# example: is_armstrong("153") returns "True"
+
+
+def run(*args) -> str:
+    if len(args) != 1:
+        return "Error: Please provide exactly one argument."
+
+    try:
+        number = int(args[0])
+    except ValueError:
+        return "Error: Argument must be an integer."
+
+    if number < 0:
+        return "False"
+
+    digits = str(number)
+    power = len(digits)
+
+    total = sum(int(digit) ** power for digit in digits)
+
+    return str(total == number)