Allow GitHub Apps to be assigned as pull request reviewers

[galshi]

🏷️ Discussion Type

Product Feedback

Body

Third-party GitHub Apps can't be added to the reviewers array on a pull request, attempting it via gh pr edit --add-reviewer returns:
GraphQL: Could not resolve user with login 'APP_NAME[bot]'. (requestReviewsByLogin)

My use case is to have custom AI code review agents deployed as GitHub Apps inside private orgs. These tools do sophisticated review workflows but can't participate in the native reviewer UX, they can only post unsolicited comments.
This could also apply to tools like Codex or Claude Code trying to work as Copilot-style reviewers.

What I'd want: an installed GitHub App shows up in the Reviewers sidebar in a pending state, assigned through the same UI and API that humans use, resolving when the app submits a review.

GitHub already does this for Copilot, I would like to be able to build on the same foundation.

Gating it on pull_requests: write plus an explicit repo/org-level opt-in seems like a reasonable way to control surface area.

Adjacent discussions I found, but not quite the same: #157751, #186152.

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[hsiddiqui84]

Is there an update on this request please?

[JamesIves]

I would also like this feature. I'd also like the ability to enable dropdown options similar to the Copilot review bots reasoning mode.

[Sweety717]

I’d also find the reasoning-mode option useful. In an AI review workflow, being able to choose how deeply the agent analyzes a PR could help balance review quality, latency, and cost depending on the PR size or risk level.