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It doesn't support this, it needs a GitHub token for authentication for commenting.

yeah, that’s what documentations says too. I was wondering if there is another way. Generating GitHub token is an overhead when all other GitHub operations are done using ssh key. 

<@U0555VASFRN> As far as I know, the GH API doesn’t support ssh authentication, <https://docs.github.com/en/rest/overview/authenticating-to-the-rest-api?apiVersion=2022-11-28|see their docs here>.

You can use the <https://www.infracost.io/docs/integrations/github_app/|GitHub App> if that’s too much overhead, that doesn’t need a token at all.