adk-python/contributing/samples/core_callback/callbacks.py

from google.genai import types


async def before_agent_callback(callback_context):
  print('@before_agent_callback')
  return None


async def after_agent_callback(callback_context):
  print('@after_agent_callback')
  return None


async def before_model_callback(callback_context, llm_request):
  print('@before_model_callback')
  return None


async def after_model_callback(callback_context, llm_response):
  print('@after_model_callback')
  return None


def after_agent_callback1(callback_context):
  print('@after_agent_callback1')


def after_agent_callback2(callback_context):
  print('@after_agent_callback2')
  # ModelContent (or Content with role set to 'model') must be returned.
  # Otherwise, the event will be excluded from the context in the next turn.
  return types.ModelContent(
      parts=[
          types.Part(
              text='(stopped) after_agent_callback2',
          ),
      ],
  )


def after_agent_callback3(callback_context):
  print('@after_agent_callback3')


def before_agent_callback1(callback_context):
  print('@before_agent_callback1')


def before_agent_callback2(callback_context):
  print('@before_agent_callback2')


def before_agent_callback3(callback_context):
  print('@before_agent_callback3')


def before_tool_callback1(tool, args, tool_context):
  print('@before_tool_callback1')


def before_tool_callback2(tool, args, tool_context):
  print('@before_tool_callback2')


def before_tool_callback3(tool, args, tool_context):
  print('@before_tool_callback3')


def after_tool_callback1(tool, args, tool_context, tool_response):
  print('@after_tool_callback1')


def after_tool_callback2(tool, args, tool_context, tool_response):
  print('@after_tool_callback2')
  return {'test': 'after_tool_callback2', 'response': tool_response}


def after_tool_callback3(tool, args, tool_context, tool_response):
  print('@after_tool_callback3')