Fix Go multi-tool tutorial snippet to include two tools (#1577)

* Fix Go multi-tool tutorial snippet to include two tools

* Update model string in multi-tool snippets to gemini-flash-latest in Python, TS, Java

---------

Co-authored-by: Kristopher Overholt <koverholt@google.com>

Author: rishipradeep-think41

examples/go/snippets/get-started/multi_tool_agent/main.go

@@ -19,6 +19,8 @@ import (
 	"context"
 	"log"
 	"os"
+	"strings"
+	"time"
 
 	"google.golang.org/genai"
 
@@ -28,9 +30,13 @@ import (
 	"google.golang.org/adk/v2/cmd/launcher/full"
 	"google.golang.org/adk/v2/model/gemini"
 	"google.golang.org/adk/v2/tool"
-	"google.golang.org/adk/v2/tool/geminitool"
+	"google.golang.org/adk/v2/tool/functiontool"
 )
 
+type CityArgs struct {
+	City string `json:"city"`
+}
+
 func main() {
 	ctx := context.Background()
 
@@ -43,14 +49,70 @@ func main() {
 		log.Fatalf("Failed to create model: %v", err)
 	}
 
+	weatherTool, err := functiontool.New[CityArgs, map[string]any](
+		functiontool.Config{
+			Name:        "get_weather",
+			Description: "Retrieves the current weather report for a specified city.",
+		},
+		func(ctx agent.Context, args CityArgs) (map[string]any, error) {
+			if strings.EqualFold(args.City, "new york") {
+				return map[string]any{
+					"status": "success",
+					"report": "The weather in New York is sunny with a temperature of 25 degrees Celsius (77 degrees Fahrenheit).",
+				}, nil
+			}
+			return map[string]any{
+				"status":        "error",
+				"error_message": "Weather information for '" + args.City + "' is not available.",
+			}, nil
+		},
+	)
+	if err != nil {
+		log.Fatalf("Failed to create get_weather tool: %v", err)
+	}
+
+	currentTimeTool, err := functiontool.New[CityArgs, map[string]any](
+		functiontool.Config{
+			Name:        "get_current_time",
+			Description: "Returns the current time in a specified city.",
+		},
+		func(ctx agent.Context, args CityArgs) (map[string]any, error) {
+			var tzIdentifier string
+			if strings.EqualFold(args.City, "new york") {
+				tzIdentifier = "America/New_York"
+			} else {
+				return map[string]any{
+					"status":        "error",
+					"error_message": "Sorry, I don't have timezone information for " + args.City + ".",
+				}, nil
+			}
+
+			tz, err := time.LoadLocation(tzIdentifier)
+			if err != nil {
+				return nil, err
+			}
+
+			now := time.Now().In(tz)
+			report := "The current time in " + args.City + " is " + now.Format("2006-01-02 15:04:05 MST-0700")
+			return map[string]any{
+				"status": "success",
+				"report": report,
+			}, nil
+		},
+	)
+	if err != nil {
+		log.Fatalf("Failed to create get_current_time tool: %v", err)
+	}
+
 	// 2. Define the agent.
 	a, err := llmagent.New(llmagent.Config{
-		Name:        "multi_tool_agent",
+		Name:        "weather_time_agent",
 		Model:       model,
-		Description: "An agent that can answer questions using Google Search.",
-		Instruction: "You are a helpful assistant. Use the available tools to answer questions.",
+		Description: "Agent to answer questions about the time and weather in a city.",
+		Instruction: "You are a helpful agent who can answer user questions about the time and weather in a city.",
 		Tools: []tool.Tool{
-			geminitool.GoogleSearch{},
+			weatherTool,
+			currentTimeTool,
 		},
 	})
 	if err != nil {

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

@@ -31,7 +31,7 @@ public class MultiToolAgent {
     public static BaseAgent initAgent() {
         return LlmAgent.builder()
             .name(NAME)
-            .model("gemini-2.0-flash")
+            .model("gemini-flash-latest")
             .description("Agent to answer questions about the time and weather in a city.")
             .instruction(
                 "You are a helpful agent who can answer user questions about the time and weather"

examples/python/snippets/get-started/multi_tool_agent/agent.py

@@ -70,7 +70,7 @@ def get_current_time(city: str) -> dict:
 
 root_agent = Agent(
     name="weather_time_agent",
-    model="gemini-2.5-flash",
+    model="gemini-flash-latest",
     description=(
         "Agent to answer questions about the time and weather in a city."
     ),

examples/typescript/snippets/get-started/multi_tool_agent/agent.ts

@@ -50,7 +50,7 @@ const getCurrentTime = new FunctionTool({
 
 export const rootAgent = new LlmAgent({
   name: 'weather_time_agent',
-  model: 'gemini-2.5-flash',
+  model: 'gemini-flash-latest',
   description: 'Agent to answer questions about the time and weather in a city.',
   instruction: 'You are a helpful agent who can answer user questions about the time and weather in a city.',
   tools: [getWeather, getCurrentTime],