Wei (Jack) Sun
1c64a41b53
Introduces two major capabilities: - Workflow runtime: graph-based execution engine for composing deterministic execution flows for agentic apps, with support for routing, fan-out/fan-in, loops, retry, state management, dynamic nodes, human-in-the-loop, and nested workflows - Task API: structured agent-to-agent delegation with multi-turn task mode, single-turn controlled output, mixed delegation patterns, human-in-the-loop, and task agents as workflow nodes Co-Authored-By: Bo Yang <ybo@google.com> Co-Authored-By: George Weale <gweale@google.com> Co-Authored-By: Sean Zhou <seanzhougoogle@google.com> Co-Authored-By: Shangjie Chen <deanchen@google.com> Co-Authored-By: Swapnil Agarwal <swapnilag@google.com> Co-Authored-By: Wei Sun <weisun@google.com> Co-Authored-By: Xuan Yang <xygoogle@google.com> Co-Authored-By: Yifan Wang <wanyif@google.com> Change-Id: I35932c50cfe29ff68559e3781713dbb5eb7b3382
82 lines
2.3 KiB
Python
82 lines
2.3 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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from google.adk import Agent
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from google.adk import Context
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from google.adk import Event
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from google.adk import Workflow
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from google.adk.events import RequestInput
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from google.adk.workflow import node
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def process_input(node_input: str):
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"""Takes the initial customer complaint as input and sets it in the state."""
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yield Event(state={"complaint": node_input, "feedback": ""})
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draft_email = Agent(
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name="draft_email",
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instruction="""
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Please write a polite, helpful response email to the following customer complaint: "{complaint}"
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If there is any feedback from the manager to revise the draft, please incorporate it: "{feedback?}"
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""",
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output_key="draft",
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)
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@node(rerun_on_resume=True)
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def human_review(draft: str, ctx: Context):
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resume_input = ctx.resume_inputs.get("human_review")
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if not resume_input:
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yield RequestInput(
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interrupt_id="human_review",
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message=(
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"Please review the following draft email and provide 'approve',"
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f" 'reject', or feedback to revise.\n\n---\n{draft}\n---"
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),
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)
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return
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if resume_input == "reject":
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yield Event(route="rejected")
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elif resume_input == "approve":
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yield Event(route="approved")
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else:
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yield Event(state={"feedback": resume_input}, route="revise")
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def reject_email():
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yield Event(message="Draft rejected.")
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def send_email(draft: str):
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yield Event(message="Draft approved and sent successfully.")
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root_agent = Workflow(
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name="request_input_rerun",
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edges=[
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("START", process_input, draft_email, human_review),
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(
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human_review,
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{
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"revise": draft_email,
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"approved": send_email,
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"rejected": reject_email,
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},
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),
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],
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)
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