Review a PR, branch, commit, or uncommitted changes for correctness bugs, structural regressions, security and performance problems. Reports findings grouped by severity with file:line and a concrete fix. Use when asked to review a PR / branch / diff / "my changes" before merge.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# PR Review
Review a change for defects. Bugs first, structure second, style last.
## 1. Resolve the target
| Input | Commands |
|---|---|
| Nothing | `git diff` + `git diff --cached` (uncommitted) |
| PR number / URL | `gh pr view <n>` then `gh pr diff <n>` |
| Base branch named, you are **on** the branch under review | `git diff <base>...HEAD` |
| Branch to review named, you are **elsewhere** | `git diff HEAD...<branch>` |
| Commit SHA | `git show <sha>` |
| `since X` / tag / `HEAD~5` | `git diff X...HEAD` + `git log X..HEAD --oneline` |
| File path | review that file's current state |
Three-dot is merge-base: `A...B` shows **B's** side. Point it the wrong way and you silently review the opposite branch. Run `git branch --show-current` before choosing the row.
Validate before reviewing:
- Ref (branch, commit, tag, range) → `git rev-parse <ref>`.
- PR → `gh pr view <n>`; a fork PR may have no local ref.
- File path → exists and readable; review it whether or not it changed.
Bad target or empty diff → stop and say so. Ambiguous input → ask; never review a guessed target.
…
The line at the top of this page pins the label git:20261004.134b66b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_hpwp7b3heovzoqtf
GET https://markdownregistry.com/api/v1/resolve?ref=mithunwijayasiri/dotclaude/pr-review
GET https://markdownregistry.com/api/v1/blob/3f8a4acda55189fe8e07d41203b375f828d7002deb914d80d8f08e2b75b06772
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