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74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
# Copyright 2026 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import json
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from typing import Optional
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from google.adk.agents import LlmAgent
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from google.adk.agents.callback_context import CallbackContext
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from google.adk.models import LlmResponse
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from google.adk.tools.vertex_ai_search_tool import VertexAiSearchTool
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from google.genai import types
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VERTEXAI_DATASTORE_ID = "projects/adk-agent-builder-assistant/locations/global/collections/default_collection/dataStores/adk-agent-builder-sample-datastore_1758230446136"
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def citation_retrieval_after_model_callback(
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callback_context: CallbackContext,
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llm_response: LlmResponse,
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) -> Optional[LlmResponse]:
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"""Callback function to retrieve citations after model response is generated."""
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grounding_metadata = llm_response.grounding_metadata
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if not grounding_metadata:
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return None
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content = llm_response.content
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if not llm_response.content:
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return None
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parts = content.parts
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if not parts:
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return None
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# Add citations to the response as JSON objects.
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parts.append(types.Part(text="References:\n"))
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for grounding_chunk in grounding_metadata.grounding_chunks:
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retrieved_context = grounding_chunk.retrieved_context
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if not retrieved_context:
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continue
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citation = {
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"title": retrieved_context.title,
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"uri": retrieved_context.uri,
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"snippet": retrieved_context.text,
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}
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parts.append(types.Part(text=json.dumps(citation)))
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return LlmResponse(content=types.Content(parts=parts))
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root_agent = LlmAgent(
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name="adk_knowledge_agent",
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description=(
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"Agent for performing Vertex AI Search to find ADK knowledge and"
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" documentation"
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),
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instruction="""You are a specialized search agent for an ADK knowledge base.
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You can use the VertexAiSearchTool to search for ADK examples and documentation in the document store.
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""",
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tools=[VertexAiSearchTool(data_store_id=VERTEXAI_DATASTORE_ID)],
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after_model_callback=citation_retrieval_after_model_callback,
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)
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