workflow_dispatch input with whitespace-only value causes 400 error and breaks UI

[hyoseong1994]

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Product Feedback

What GitHub Actions topic or product is this about?

General

Discussion Details

This seems to be an API-level validation issue, but the main problem is the UX.

When a whitespace-only value is submitted via the Actions UI,
the request fails with a 400 error before the workflow runs,
and the UI does not surface any validation message.
Instead, the page appears to break.

Even if whitespace-only values are considered invalid,
the UI should prevent submission or display a clear validation error.

screen-capture.webm

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