Defining a YAML workflow 
workflow:
  name: "workflow_1"
  timeout: 0
  steps:
    - id: "step_1"
      input: "who is 0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
      output: "step_3"
    - id: "step_2"
      input: "write a content about ethereum"
      output: "step_3"
    - id: "step_3"
      input: "send the content in the forecaster, max 100 words"
Run a workflow 
from aser import Workflow,Agent
from aser.toolkits import web3bio,cast
workflow_agent=Agent(
    name="workflow_agent",
    model="gpt-4.1-mini",
    tools=[web3bio,cast]
)
post_caster_workflow=Workflow(workflow_agent,"examples/workflow.yaml")
post_caster_workflow.start()