Create a developer folder and add samples.

PiperOrigin-RevId: 755885332

contributing/samples/generate_image/agent.py

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+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from google.genai import Client
+from google.genai import types
+
+from google.adk import Agent
+from google.adk.tools import load_artifacts
+from google.adk.tools import ToolContext
+
+# Only Vertex AI supports image generation for now.
+client = Client()
+
+
+async def generate_image(prompt: str, tool_context: 'ToolContext'):
+  """Generates an image based on the prompt."""
+  response = client.models.generate_images(
+      model='imagen-3.0-generate-002',
+      prompt=prompt,
+      config={'number_of_images': 1},
+  )
+  if not response.generated_images:
+    return {'status': 'failed'}
+  image_bytes = response.generated_images[0].image.image_bytes
+  await tool_context.save_artifact(
+      'image.png',
+      types.Part.from_bytes(data=image_bytes, mime_type='image/png'),
+  )
+  return {
+      'status': 'success',
+      'detail': 'Image generated successfully and stored in artifacts.',
+      'filename': 'image.png',
+  }
+
+
+root_agent = Agent(
+    model='gemini-2.0-flash-001',
+    name='root_agent',
+    description="""An agent that generates images and answer questions about the images.""",
+    instruction="""You are an agent whose job is to generate or edit an image based on the user's prompt.
+""",
+    tools=[generate_image, load_artifacts],
+)