test: create TestAgent009

Additionally add support for instantiating LongRunningFunctionTool
from config, the `func` parameter is interpreted as a name of a
FuncTool registered elsewhere, that the LongRunningFunction tool is
wrapping

PiperOrigin-RevId: 845264027

Author: google-genai-bot

core/src/main/java/com/google/adk/tools/FunctionTool.java

@@ -185,6 +185,17 @@ public Method func() {
     return func;
   }
 
+  /** Returns the underlying function's {@link Object} instance if present. */
+  @Nullable
+  Object instance() {
+    return instance;
+  }
+
+  /** Returns whether the function requires confirmation */
+  boolean requireConfirmation() {
+    return requireConfirmation;
+  }
+
   /** Returns true if the wrapped function returns a Flowable and can be used for streaming. */
   public boolean isStreaming() {
     Type returnType = func.getGenericReturnType();

core/src/main/java/com/google/adk/tools/LongRunningFunctionTool.java

@@ -16,6 +16,8 @@
 
 package com.google.adk.tools;
 
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.google.adk.utils.ComponentRegistry;
 import java.lang.reflect.Method;
 import javax.annotation.Nullable;
 
@@ -70,6 +72,14 @@ public static LongRunningFunctionTool create(
     return new LongRunningFunctionTool(instance, method, requireConfirmation);
   }
 
+  /** Creates a LongRunningFunctionTool from a FunctionTool. */
+  public static LongRunningFunctionTool create(FunctionTool tool) {
+    @Nullable Object instance = tool.instance();
+    Method m = tool.func();
+    boolean requireConfirmation = tool.requireConfirmation();
+    return create(instance, m, requireConfirmation);
+  }
+
   private LongRunningFunctionTool(Method func, boolean requireConfirmation) {
     super(null, func, /* isLongRunning= */ true, requireConfirmation);
   }
@@ -78,4 +88,22 @@ private LongRunningFunctionTool(
       @Nullable Object instance, Method func, boolean requireConfirmation) {
     super(instance, func, /* isLongRunning= */ true, requireConfirmation);
   }
+
+  public static LongRunningFunctionTool fromConfig(ToolArgsConfig config, String configAbsPath) {
+    String funcName =
+        config
+            .getOrEmpty("func", new TypeReference<String>() {})
+            .orElseThrow(() -> new IllegalArgumentException("func argument is empty"));
+
+    FunctionTool funcTool =
+        ComponentRegistry.getInstance()
+            .get(funcName, FunctionTool.class)
+            .orElseThrow(
+                () ->
+                    new IllegalArgumentException(
+                        String.format(
+                            "failed to find FunctionTool %s in the ComponentRegistry", funcName)));
+
+    return create(funcTool);
+  }
 }

core/src/main/java/com/google/adk/utils/ComponentRegistry.java

@@ -32,6 +32,7 @@
 import com.google.adk.tools.ExitLoopTool;
 import com.google.adk.tools.GoogleSearchTool;
 import com.google.adk.tools.LoadArtifactsTool;
+import com.google.adk.tools.LongRunningFunctionTool;
 import com.google.adk.tools.UrlContextTool;
 import com.google.adk.tools.mcp.McpToolset;
 import java.util.Map;
@@ -110,6 +111,7 @@ private void initializePreWiredEntries() {
     registerAdkToolInstance("url_context", UrlContextTool.INSTANCE);
 
     registerAdkToolClass(AgentTool.class);
+    registerAdkToolClass(LongRunningFunctionTool.class);
 
     registerAdkToolsetClass(McpToolset.class);
     // TODO: add all python tools that also exist in Java.