Dify, a visual workflow to build/test LLM applications

Very slick and potentially very powerful. After a few minutes playing with it, I have a few recommendations:

- Variables should have more types, like an array of objects

- Prompting should incorporate Jinja2/Nunjucks

- For every prompt, I should be able to create many different test examples, along with an answer key, and measure how well it does across many tests

- It should auto-save. I did a lot of prompting work and then clicked another icon. When I came back, all my work was gone. (In fact, I don't see where to save at all! Maybe I'm just missing it.)

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