How to get the startup_failure reason of a workflow using the API?

[ohaval]

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Some workflow runs might not be able to start due to a specific error.
For instance, a workflow which tries to execute a GitHub Action which is not allowed to run for an organization will receive the following error which can be seen in the UI:

[Error: .github#L1](https://github.com/test-organization/test-repo/commit/abcde#annotation_123456)
some-org/some-action@v2.4 is not allowed to be used in test-organization/test-repo. Actions in this workflow must be: within a repository owned by test-organization, created by GitHub, or verified in the GitHub Marketplace.

My question, is how can I see this same error using the API?
I only manage to get the workflow run (as I have the ID), and I see the conclusion of startup_failure but I couldn't find a way to view the full error message like the UI shows.

Thanks

[aadsm]

I have the same need. In the meanwhile I'm scrapping the workflow run webpage. This works nicely for public workflows, with the caveat that it can break at any time the html structure changes.

# xargs is only used for trimming
ANNOTATION=$(curl "https://github.com/$GHUSER/$GHREPO/actions/runs/$RUN_ID" 2>/dev/null | grep 'annotation-message.annotationContainer' -A 1 | tail -n 1 | xargs)
ANNOTATION=${ANNOTATION##<div>}
ANNOTATION=${ANNOTATION%%</div>}

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