The Flow object gives you control over how the agent moves between steps in a flow. It is most commonly used inside transition functions, where deterministic logic determines what happens next.
Only the last flow.goto_step() call in a function is executed. To prevent accidental overrides, always use return immediately after a goto_step() call — unless you’re explicitly chaining transitions.

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current_step (Property)

Type: string Returns: The name of the current step the agent is in. 
if flow.current_step == "Collect Name":
    return "You're in the name collection step."
Use this for debugging or conditional routing.

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goto_step(step_name) (Method)

Use flow.goto_step() to move the agent to another step in the flow. This replaces the current step’s prompt and functions with those of the target step. 
flow.goto_step("Confirm Name")
return
Only the prompt and functions in the current step are visible to the LLM — step names, flow names, and previous prompts are not included in its context.
Use return immediately after calling goto_step() to avoid silent failures. Only the final call in a function is executed.

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Conditional transition example

if conv.state.has_phone_number:
    flow.goto_step("Confirm phone number")
    return
else:
    flow.goto_step("Collect phone number")
    return

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Input validation and state update

def transition_to_confirm_name(conv: Conversation, flow: Flow, first_name: str, last_name: str):
    if not first_name or not last_name:
        return "Please make sure we have both first and last name before continuing."

    conv.state.first_name = first_name
    conv.state.last_name = last_name

    flow.goto_step("Confirm Name")
    return
This is the recommended structure for transition logic: validate input, update state, transition, then return.
If your function is called go_to_step_two, the LLM may generate irrelevant responses like “Okay, moving on.” Use intent-based names like check_user_info or verify_email to anchor model behavior.

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Best practices

  • Design flows like state machines — each step represents a specific state with a clear transition path.
  • Keep transition functions short and scoped to a single decision.
  • Avoid chaining multiple function calls in the same function — consolidate them into a single utility or flow function.

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Good to know

  • Any step in a flow can be designated as the start step in the UI.
  • Use current_step for step-aware debugging or conditional re-routing.
  • Exit steps are defined using conv.exit_flow() and are visually marked in yellow in the Flow Editor.
  • Transition functions live inside flows, not globally — reuse shared logic via global utility functions instead.
  • Function names affect both behavior and language — treat them as part of your prompt design.