> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agno.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Iterative Workflow
> Repeat steps with Loop until an end condition returns True or max_iterations is reached.
**Example use cases**: Quality improvement loops, retry mechanisms, iterative refinement
A `Loop` repeats its steps until the `end_condition` returns `True` or `max_iterations` (default 3) is reached. The end condition can be a Python function, a [CEL expression](/examples/workflows/cel-expressions/loop/cel-content-keyword) string, or omitted to always run the maximum number of iterations.
## Example
```python iterative_workflow.py theme={null}
from agno.workflow import Loop, Step, StepInput, StepOutput, Workflow
def expand_research(step_input: StepInput) -> StepOutput:
prior = step_input.previous_step_content or str(step_input.input)
return StepOutput(content=f"{prior}\nAdditional verified research notes.")
def quality_check(outputs: list[StepOutput]) -> bool:
return any(len(str(output.content or "")) > 120 for output in outputs)
def create_final_analysis(step_input: StepInput) -> StepOutput:
research = step_input.previous_step_content or "No research returned"
return StepOutput(content=f"Final analysis:\n{research}")
workflow = Workflow(
name="Quality-Driven Research",
steps=[
Loop(
name="Research Loop",
steps=[Step(name="Deep Research", executor=expand_research)],
end_condition=quality_check,
max_iterations=3,
forward_iteration_output=True,
),
Step(name="Final Analysis", executor=create_final_analysis),
],
)
workflow.print_response("Research the impact of renewable energy on global markets", markdown=True)
```
## Iteration Output Forwarding
By default, each iteration starts from the original loop `StepInput` (`forward_iteration_output=False`). With `forward_iteration_output=True`, the next iteration receives an updated `StepInput`: `input` remains the original workflow input, while `previous_step_content` and `previous_step_outputs` contain results from the preceding iteration.
## Developer Resources
* [Loop Steps Workflow](/workflows/usage/loop-steps-workflow)
* [Loop Iterative Accumulation](/workflows/usage/loop-iterative-accumulation)
## Reference
For complete API documentation, see [Loop Steps Reference](/reference/workflows/loop-steps).