diff --git a/src/commonTest/kotlin/tool/ToolInputTest.kt b/src/commonTest/kotlin/tool/ToolInputTest.kt
index 42b2fc3..64c7692 100644
--- a/src/commonTest/kotlin/tool/ToolInputTest.kt
+++ b/src/commonTest/kotlin/tool/ToolInputTest.kt
@@ -87,7 +87,7 @@ class ToolInputTest {
 
   @Test
   fun `Should fail to create a Tool without AnthropicTool annotation`() {
-    val exception = assertFailsWith<SerializationException> {
+    assertFailsWith<SerializationException> {
       Tool<NoAnnotationTool>()
     } should {
       have(message!!.matches(Regex(