# Build on previous loop outputs with forward_iteration_output

> Resolved a bug where each iteration of a Loop always received the original input rather than the output of the previous iteration, causing loops to repeat work instead of building on it.

- Published: 2026-03-06
- Author: Agno Team
- Category: Changelog
- Canonical: https://agno-com-nine.vercel.app/articles/fix-loop-iteration-input-chaining-and-add-opt-in-forwarding-via-forward-iteration-output
- Markdown: https://agno-com-nine.vercel.app/articles/fix-loop-iteration-input-chaining-and-add-opt-in-forwarding-via-forward-iteration-output.md

Resolved a bug where each iteration of a Loop always received the original input rather than the output of the previous iteration, causing loops to repeat work instead of building on it. A new `forward_iteration_output` flag lets you explicitly opt in to passing each iteration's output forward as the next iteration's input.

Details**:**

- Fixes the default behavior where loop iterations were incorrectly re-receiving the original input
- Set `forward_iteration_output=True` to chain iteration outputs sequentially through the loop
- Default behavior remains unchanged for workflows that do not set the flag, preserving backward compatibility

See [docs](https://docs.agno.com/workflows/workflow-patterns/iterative-workflow#iteration-output-forwarding)