How to Use Cursor Bugbot to Review Pull Requests
Cursor Bugbot is an automated code reviewer. Connect it to GitHub and it comments on pull requests, flagging bugs and explaining the fix in the same diff view your team already uses.
Direct answer: Install the Bugbot GitHub app, authorize the repos you want reviewed, and it will post review comments on every new pull request automatically.
What Does Bugbot Actually Look For?
It reasons about the diff, not just lint rules. Typical catches include null dereferences, off-by-one errors, unhandled promise rejections, mutated state in React components, and logic that contradicts a nearby comment. It also flags missed edge cases, like a function that handles the empty array but not the missing key.
It is not a formatter or a type checker. Those run separately with faster, cheaper tools.
How Do You Set It Up?
- Sign in to the Cursor dashboard with your GitHub account.
- Install the Bugbot GitHub App and choose repository access — all repos or a selected list.
- Open a test pull request to confirm a review appears.
- Adjust per-repo settings for comment verbosity.
Setup takes about five minutes. The important decision is scope: start with one active repository rather than enabling everything, or you will drown in comments on code nobody is changing.
How Does It Behave on a Real PR?
Bugbot posts inline comments attached to specific lines, plus a short summary. Each finding includes a description of the problem and a suggested change you can apply. If it finds nothing serious, it says so rather than inventing problems — which matters, because noisy reviewers get muted.
Re-runs happen when you push new commits, so pushing a fix and waiting for a fresh review is the normal loop.
Bugbot vs Human Review
| Aspect | Bugbot | Human reviewer |
|---|---|---|
| Speed | Seconds to minutes | Hours to days |
| Context of product goals | None | Strong |
| Architecture judgment | Limited | Strong |
| Tirelessness | Total | Declines at 5pm |
It is a first pass, not a replacement. The value is catching mechanical bugs so your senior engineer spends review time on design.
How Much Does Bugbot Cost?
Bugbot is a paid add-on to Cursor, billed separately from the editor’s subscription, with pricing tied to usage and team seats. There is no free tier that covers production repos, so budget for it per developer. If your team already pays for Cursor, it is an incremental line item rather than a new platform.
Where It Falls Short
It cannot see your runtime. A bug that only appears with specific database state or a race condition across services is invisible to a diff reader. It also over-weights changed lines — a lurking problem in untouched code stays hidden.
And it occasionally flags intentional patterns as bugs, which means your team needs a shared habit of resolving comments rather than letting them pile up.
Who Should Use It
Good fit for small teams where no one has time for thorough review, and for open-source maintainers facing a backlog. Poor fit for codebases where the real risk is architectural — Bugbot will not tell you the whole approach is wrong.
Quick Summary
- Bugbot is a paid Cursor add-on that reviews GitHub pull requests automatically.
- Install the GitHub App and scope it to one repo to start.
- It posts inline comments with suggested fixes and re-runs on new commits.
- It catches mechanical bugs, not runtime or architectural issues.
- Best used as a first pass before human review.
