> For the complete documentation index, see [llms.txt](https://docs.roboflow.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.roboflow.com/changelog/explore-by-month/april-2026/nested-workflow-block.md). # Nested Workflow Block A new nested Workflow block is now available, allowing you to construct pipelines that call and execute other existing workflows. When you add this block, it automatically adopts the inputs and outputs of the nested workflow, enabling you to easily pass data like images or object detections between the parent and child pipelines. The Workflow block enables a highly modular approach to building computer vision applications. You can reuse existing logic across multiple pipelines and pass resolved output types directly to downstream steps like visualizations without rebuilding the entire sequence. [See the Workflow block documentation](https://inference.roboflow.com/workflows/blocks/inner_workflow/) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.roboflow.com/changelog/explore-by-month/april-2026/nested-workflow-block.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.