fix: use json object type

src/AnthropicClient/Models/Tool.cs

@@ -25,7 +25,7 @@ public class Tool
   /// Gets the input schema of the tool.
   /// </summary>
   [JsonPropertyName("input_schema")]
-  public JsonNode InputSchema { get; }
+  public JsonObject InputSchema { get; }
 
   /// <summary>
   /// Gets the function of the tool.
@@ -116,4 +116,13 @@ public class Tool
 
     return new Tool(name, description, new AnthropicFunction(func.Method, func.Target));
   }
+
+  public static Tool CreateFromFunction<T1, TResult>(string name, string description, Func<T1, TResult> func)
+  {
+    ArgumentValidator.ThrowIfNull(name, nameof(name));
+    ArgumentValidator.ThrowIfNull(description, nameof(description));
+    ArgumentValidator.ThrowIfNull(func, nameof(func));
+
+    return new Tool(name, description, new AnthropicFunction(func.Method, func.Target));
+  }
 }