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Is there a debugger for cast-actions like Warpcast frame validator or @frames debugger or @frog-dev devtools? How do you all test cast actions locally?

There's not much to test, action can either send messages back or frame.
So for messages, there's nothing to test because that will be just a toast on Waprcast.

And for the frame, you have the validators you enumerated before.

In a worst-case scenario, you would use a test fid to test live, on warpcast, you just need to install the action.

And you can do that with the URL for installing actions ex:

https://warpcast.com/~/add-cast-action?url=https://api.yup.io/fc-actions/cross-post

On Warpcast validators are only for composer-actions, and frames not for simple actions, but like I said don't see a good reason for them.

That makes sense 👍.
Thought about this when a small difference led me on a wild goose chase. When hitting a frame for the first time from a cast, the state isn’t included. However, when doing it from the cast action, it's included. (I was using from.fm . Not sure if that's specific to the framework.)

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Correct not only that but hitting a frame when is not in a cast action will be hit by get, whereas in cast action will be hit by post. There are some subtle differences, but hopefully don't cause many issues for most devs.