I tried to use the action and I initially failed. This was my reasoning:

1. I was reading the README from here and I saw this part:

Before using this action, ensure that you've locally run Air on your entire project at least once using air format . or the Air: Format Workspace Folder command in VS Code or Positron, otherwise you can end up with a very large amount of suggestions.

2. I ran air format . locally, and I saw that in fact it detected not too many changes, so I felt the above clarification was unnecessary in my case and I could handle this directly through committing the bot suggestions in the PR.
3. I created a PR expecting to see the bot suggestions but the format-suggest.yaml workflow ended correctly and nothing showed up.
4. I tried to push a dummy change and in this case the suggestion did show up, but only for this small change.
5. I realised the suggestions only appear for code that was changed in that same PR, not all the code. I don't know how the action really works so I can't tell if this is just a default, but it was confusing for me.

Leaving this here in case this happens to someone else.
Also my attempts through the steps above if it helps eduaguilera/whep#49.