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Runs one question against several versions of an agent at once, so a change can be judged instead of hoped about.
You changed the prompt, swapped the model, added a tool. Did it get better? The honest answer is usually that nobody knows, because the old version is gone.
Ragenta keeps every published version. Pick two or three, send them the same input, and read the answers side by side with what each one cost. Then publish the one that won, or restore the one you had.