ADK Workflow Loop Self Sample

Overview

This sample demonstrates how a node can repeatedly loop back to itself based on a specific route condition in ADK Workflows.

It takes a user-provided target number (between 0 and 10), and uses a guess_number function to randomly generate guesses. If the guess is incorrect, the function yields a specific route (guessed_wrong). The workflow is configured such that this route directs the execution right back to the guess_number node, creating a loop that continues until the correct number is guessed.

In ADK Workflows, you can create self-referential loops or iterative processes by routing a node's output back to itself.

Sample Inputs

5
0
10

Graph

text

                  [ START ]
                      |
                      v
              [ validate_input ]
                      |
                      v
             +->[ guess_number ]-----+
             |        |              |
             |        v              |
             +--"guessed_wrong"      v
                               (Loop ends when
                              guess is correct)

How To

From within your node (agent or function), yield a specific Event with a route name when you determine the node needs to be executed again:
python
```
def guess_number(target_number: int):
  # ...
  if guess != target_number:
    yield Event(route='guessed_wrong')
```
In the Workflow edges definition, create a conditional edge where the source and target are the same node, using a routing map dict:
python
```
(guess_number, {'guessed_wrong': guess_number})
```