Introducing Daggr: Chain apps programmatically, inspect visually

TL;DR: Daggr is a new, open-source Python library for building AI workflows that connect Gradio apps, ML models, and custom functions. It automatically generates a visual canvas where you can inspect intermediate outputs, rerun individual steps, and manage state for complex pipelines, all in a few lines of Python code!

Table of Contents

1. Background
2. Getting Started
3. Sharing Your Workflows
4. End-to-End Example with Different Nodes
5. Next Steps

Background

If you've built AI applications that combine multiple models or processing steps, you know the pain: chaining API calls, debugging pipelines, and losing track of intermediate results. When something goes wrong in step 5 of a 10-step workflow, you often have to re-run everything just to see what happened.

Most developers either build fragile scripts that are hard to debug or turn to heavy orchestration platforms designed for production pipelines—not rapid experimentation.

We've been working on Daggr to solve problems we kept running into when building AI demos and workflows:

Visualize your code flow: Unlike node-based GUI editors, where you drag and connect nodes visually, Daggr takes a code-first approach. You define workflows in Python, and a visual canvas is generated automatically. This means you get the best of both worlds: version-controllable code and visual inspection of intermediate outputs.

Inspect and Rerun Any Step: The visual canvas isn't just for show. You can inspect the output of any node, modify inputs, and rerun individual steps without executing the entire pipeline. This is invaluable when you're debugging a 10-step workflow and only step 7 is misbehaving. You can even provide “backup nodes” – replacing one model or Space with another – to build resilient workflows.

State Persistence: Daggr automatically saves your workflow state, input values, cached results, canvas position—so you can pick up where you left off. Use "sheets" to maintain multiple workspaces within the same app.