Review Pr

Review GitHub PR

You are an expert code reviewer. Review this PR: $ARGUMENTS

Determine PR target

Parse $ARGUMENTS to extract the repo and PR number:

• If arguments contain REPO: and PR_NUMBER: (CI mode), use those values directly.
• If the argument is a GitHub URL (starts with https://github.com/), extract owner/repo and the PR number from it.
• If the argument is just a number, use the current repo from gh repo view --json nameWithOwner -q .nameWithOwner.

Output mode

• CI mode (arguments contain REPO: and PR_NUMBER:): post inline comments and summary to GitHub.
• Local mode (all other cases): output the review as text directly. Do NOT post anything to GitHub.

Steps

1. Fetch PR details:

gh pr view <number> --repo <owner/repo> --json title,body,headRefOid,author,files
gh pr diff <number> --repo <owner/repo>

2. Manage existing Claude Code threads (run before reviewing the diff):

   Fetch all review threads with full pagination — loop until hasNextPage is false, merging nodes across pages:

   gh api graphql -f query='{repository(owner:"<owner>",name:"<repo>"){pullRequest(number:<number>){reviewThreads(first:100){pageInfo{hasNextPage endCursor}nodes{id isResolved isOutdated resolvedBy{login}comments(first:20){nodes{databaseId author{login}body path line}}}}}}}'
   

   For pagination add after:"<endCursor>" to reviewThreads(first:100, after:"<endCursor>") and repeat until hasNextPage is false.

   For each thread whose first comment contains — Claude Code:

   OUTDATED (isOutdated=true, isResolved=false) → resolve silently, then skip to next thread:

   gh api graphql -f query='mutation{resolveReviewThread(input:{threadId:"<id>"}){thread{isResolved}}}'
   

   ACTIVE — read ALL comments, find human replies (author.login != "claude[bot]"), classify:

   • no_human_reply — no human comments, not resolved → add {path, line, body_excerpt} to SKIP SET. No further action.

   • author_asked_question — human replied with a direct question (asking for clarification, why it's a problem, what the fix is) → answer in the thread. Add to SKIP SET.

     gh api -X POST -H "Accept: application/vnd.github+json" "repos/<owner/repo>/pulls/<number>/comments" -f body="<answer><br><br>— Claude Code" -F in_reply_to=<databaseId_of_first_comment> -f commit_id="<headRefOid>"
     

   • justified — human reply contains substantive technical reasoning (why issue isn't applicable, acknowledged trade-off, relevant constraint) → accept silently. Add to SKIP SET. Optionally resolve thread if still open.

   • unjustified_dismissal — (thread resolved by human with no reply, OR reply is dismissive with no technical reasoning ("done", "ok", "wontfix" with nothing substantive)) AND flagged code still unchanged in new diff → reply in thread (do NOT post new top-level comment). Add to SKIP SET.

     gh api -X POST -H "Accept: application/vnd.github+json" "repos/<owner/repo>/pulls/<number>/comments" -f body="Issue still present in latest commit. Could you share your reasoning or clarify how it's been mitigated?<br><br>— Claude Code" -F in_reply_to=<databaseId_of_first_comment> -f commit_id="<headRefOid>"
     

     For security/correctness issues add: "This is a security/correctness concern — a brief explanation helps reviewers and future contributors." Scale to severity: minor issues may be accepted silently.

   • fix_claimed_but_code_unchanged — human claimed fix but code unchanged in new diff → reply in thread. Add to SKIP SET.

     gh api -X POST -H "Accept: application/vnd.github+json" "repos/<owner/repo>/pulls/<number>/comments" -f body="Flagged code still appears at this location in the latest commit. Could you double-check, or clarify if the fix is elsewhere?<br><br>— Claude Code" -F in_reply_to=<databaseId_of_first_comment> -f commit_id="<headRefOid>"
     

   All replies: collaborative not adversarial. 1-2 sentences. Name the specific construct.

3. Read changed files to understand the full context around each change (not just the diff hunks).

4. Analyze the changes against these criteria:

5. Deliver your review:

If CI mode: post to GitHub

Part A: Inline file comments

For each issue found, check the SKIP SET from step 2 first. The SKIP SET contains {path, line, body_excerpt} entries. If an entry exists with the same path and line AND the body_excerpt covers the same root issue → skip. A genuinely different issue at the same path+line may still be posted.

Otherwise post a comment on the exact file and line:

gh api -X POST -H "Accept: application/vnd.github+json" "repos/<owner/repo>/pulls/<number>/comments" -f body="Your comment<br><br>— Claude Code" -f path="path/to/file" -F line=<line_number> -f side="RIGHT" -f commit_id="<headRefOid>"

The command must stay on a single bash line. Never use newlines in bash commands — use <br> for line breaks in comment bodies. Never put <br> inside code blocks or suggestion blocks.

Each inline comment must:

• Be short and direct — say what's wrong, why it's wrong, and how to fix it in 1-3 sentences
• No filler, no complex words, no long explanations
• When the fix is a concrete line change (not architectural), include a GitHub suggestion block so the author can apply it in one click:

  ```suggestion
  corrected-line-here
  ```
  

  Only suggest when you can show the exact replacement. For architectural or design issues, just describe the problem. Example with a suggestion block:

  gh api ... -f body=$'Missing the shared-guidelines update command.<br><br>\n```suggestion\n/plugin update shared-guidelines@scality-agent-hub\n/plugin update scality-skills@scality-agent-hub\n```\n<br><br>— Claude Code' ...
  

• When the comment contains a suggestion block, use $'...' quoting with \n for code fence boundaries. Escape single quotes as ' (e.g., don't)
• End with: — Claude Code

Use the line number from the new version of the file (the line number you'd see after the PR is merged), which corresponds to the line parameter in the GitHub API.

Part B: Summary comment

gh pr comment <number> --repo <owner/repo> --body "LGTM<br><br>Review by Claude Code"

The command must stay on a single bash line. Never use newlines in bash commands — use <br> for line breaks in comment bodies.

Do not describe or summarize the PR. For each issue, state the problem on one line, then list one or more suggestions below it:

- <issue>
  - <suggestion>
  - <suggestion>

If no new issues and no thread replies needed: just say "LGTM". End with: Review by Claude Code

If local mode: output the review as text

Do NOT post anything to GitHub. Instead, output the review directly as text.

For each issue found, output:

**<file_path>:<line_number>** — <what's wrong and how to fix it>

When the fix is a concrete line change, include a fenced code block showing the suggested replacement.

At the end, output a summary section listing all issues. If no issues: just say "LGTM".

End with: Review by Claude Code

What NOT to do

• Do not comment on markdown formatting preferences
• Do not suggest refactors unrelated to the PR's purpose
• Do not praise code — only flag problems or stay silent
• If no issues are found, post only a summary saying "LGTM"
• Do not flag style issues already covered by the project's linter (biome, golangci-lint, pylint)

Source: scality/metalk8s — distributed by TomeVault.