Input Binding for Tool not working?

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Posted on by WM-26011729-0

I'm using a custom connector with an API, and I want to use that as a Tool within Copilot. The problem is, the recognized input is always wrong:

I've checked the Swagger code and I can confirm that the input in question should be string as seen here:

But Copilot interprets this as a file input for whatever reason:

I have rebuilt this Custom Connector multiple times, removed and re-added into Copilot studio multiple times, all with the same end result. Am I doing something wrong here, or is this just broken?

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Calling actions from Copilot Studio

Topic creation & management

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Michael E. Gernaey 53,926 Super User 2025 Season 2 on at

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Hi @WM-26011729-0

Right now you are telling it its bytes, instead of type: string did you mean to do that? Bytes is not a string, it would consider it an object of bytes.

Also remove the brackets, curlies or any other annotations that you might want to use other than - or _ for now please try just changing the name to filename or something else, and make it a string not bytes.

If these suggestions help resolve your issue, Please consider Marking the answer as such and also maybe a like.

Thank you!
Sincerely, Michael Gernaey

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WM-26011729-0 2 on at

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So changing the name does work, but then the API I'm interacting with won't give a proper response. I need to pass that exact format of filter[name]. Is there any way around that?

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Michael E. Gernaey 53,926 Super User 2025 Season 2 on at

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Hi @WM-26011729-0

That's a great question, at the moment there is no way that I know of, I tried encoding it, but it didn't work (at least for me), I only know its a limitation because of those specific characters and what they represent :-(

I am sorry but the answer I gave is the only answer I know of that makes it work.

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