diff --git a/Sources/AnthropicSwiftSDK/Entity/Tool/FunctionTool.swift b/Sources/AnthropicSwiftSDK/Entity/Tool/FunctionTool.swift
index 24a2ae3..b544073 100644
--- a/Sources/AnthropicSwiftSDK/Entity/Tool/FunctionTool.swift
+++ b/Sources/AnthropicSwiftSDK/Entity/Tool/FunctionTool.swift
@@ -87,7 +87,7 @@ public class InputSchema {
         /// A true/false value
         case boolean
         /// A list of values
-        case arrray
+        case array
         /// A complex object with properties
         case object
     }