How can I make the tool output a download instead of a string?

[zzwtop1]

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I started a FastAPI server locally using Python and created a custom tool with Dify. How should I define the schema so that the tool outputs a file instead of a string? Here's the schema I’m currently using:
schema.txt
Here is a portion of the Fast API code I used to start the server:
python.txt

[dosubot[bot]]

I found 3 similar discussions that might be helpful:

• Customize tool output file
• How can I output a file in Workflow
• OpenAPI custom tools to support files response

None of these discussions have found a solution yet, but they may provide insights or alternative approaches to your query.