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I haven't found anything documented, but from looking at the code, am I right in guessing that the Pulumi GitHub app spots "things that look like Pulumi outputs" and renders them as comments? I assume there must be some transformation happening because the GHA code writes something like `pulumi preview on &lt;stack&gt;` in the code that produces PR comments, whereas if you have the app you end up with somelike `The Update (preview) for stack &lt;stack&gt; was successful` etc.