Fix error message in MultiToolAgent.java example (#441)

The @Schema parameter annotation is missing the parameter name, leading to the following error message:

[agents.multitool.MultiToolAgent.main()] ERROR com.google.adk.tools.FunctionTool -- Functions used in tools must have their parameters annotated with @Schema or at least the code must be compiled with the -parameters flag as a fallback. Your function tool will likely not work as expected and exit at runtime.

Co-authored-by: Sita Lakshmi Sangameswaran <[email protected]>

Author: tucosh

examples/java/cloud-run/src/main/java/agents/multitool/MultiToolAgent.java

@@ -43,7 +43,8 @@ public static BaseAgent initAgent() {
     }
 
     public static Map<String, String> getCurrentTime(
-        @Schema(description = "The name of the city for which to retrieve the current time")
+        @Schema(name = "city",
+                description = "The name of the city for which to retrieve the current time")
         String city) {
         String normalizedCity =
             Normalizer.normalize(city, Normalizer.Form.NFD)
@@ -76,7 +77,8 @@ public static Map<String, String> getCurrentTime(
     }
 
     public static Map<String, String> getWeather(
-        @Schema(description = "The name of the city for which to retrieve the weather report")
+        @Schema(name = "city",
+                description = "The name of the city for which to retrieve the weather report")
         String city) {
         if (city.toLowerCase().equals("new york")) {
             return Map.of(
@@ -119,4 +121,4 @@ public static void main(String[] args) throws Exception {
         }
     }
 }
-// --8<-- [end:full_code]
+// --8<-- [end:full_code]