agent-framework/dotnet/samples/03-workflows/Declarative/InvokeFunctionTool/InvokeFunctionTool.yaml

#
# This workflow demonstrates using InvokeFunctionTool to call functions directly
# from the workflow without going through an AI agent first.
#
# InvokeFunctionTool allows workflows to:
# - Pre-fetch data before calling an AI agent
# - Execute operations directly without AI involvement
# - Store function results in workflow variables for later use
#
# Example input: 
# What are the specials in the menu?
#
kind: Workflow
trigger:

  kind: OnConversationStart
  id: workflow_invoke_function_tool_demo
  actions:

    # Invoke GetSpecials function to get today's specials directly from the workflow
    - kind: InvokeFunctionTool
      id: invoke_get_specials
      conversationId: =System.ConversationId
      requireApproval: true
      functionName: GetSpecials
      output:
        autoSend: true
        result: Local.Specials
        messages: Local.FunctionMessage

    # Display a message showing we retrieved the specials
    - kind: SendMessage
      id: show_specials_intro
      message: "Today's specials have been retrieved. Here they are: {Local.Specials}"

    # Now use an agent to format and present the specials to the user
    - kind: InvokeAzureAgent
      id: invoke_menu_agent
      conversationId: =System.ConversationId
      agent:
        name: FunctionMenuAgent
      input:
        messages: =UserMessage("Please describe today's specials in an appealing way.")
      output:
        messages: Local.AgentResponse

    # Allow the user to ask follow-up questions in a loop
    - kind: InvokeAzureAgent
      id: invoke_followup
      conversationId: =System.ConversationId
      agent:
        name: FunctionMenuAgent
      input:
        externalLoop:
          when: =Upper(System.LastMessage.Text) <> "EXIT"