Check PR

Analyze a pull request (GitHub), merge request (GitLab), or shelved changelist (Perforce) for review comments, status checks, and description completeness, then help address any issues found.

Inputs

• PR/MR/CL number (optional): If not provided, detect the PR/MR for the current branch, or the default pending changelist for p4.

Instructions

0. Detect platform

First check if the user is working in a Perforce depot by looking for a .p4config file or P4CLIENT/P4PORT environment variables:

# Check for Perforce environment
if p4 info >/dev/null 2>&1; then
  VCS="perforce"
else
  # Fall back to git remote detection
  REMOTE_URL=$(git remote get-url origin)
  if echo "$REMOTE_URL" | grep -qi "gitlab"; then
    VCS="gitlab"
  else
    VCS="github"
  fi
fi

For self-hosted GitLab instances whose hostname doesn't contain "gitlab", the user can override by passing --vcs gitlab as an input. For Perforce, the user can override by passing --vcs perforce.

1. Identify the PR/MR/CL

If a number was provided, use it. Otherwise, detect it:

GitHub:

gh pr view --json number -q .number

GitLab:

glab mr view --output json | jq '.iid'

Perforce:

# List pending changelists for the current user/client
p4 changes -s pending -u $P4USER -c $P4CLIENT

Key field differences between platforms:

• GitHub: number, headRefName, headRefOid
• GitLab: iid, source_branch, sha
• Perforce: changelist number (CL), shelved files for in-review CLs

2. Fetch PR/MR/CL details

GitHub:

gh pr view <PR_NUMBER> --json title,body,state,reviews,comments,headRefName,statusCheckRollup
gh api repos/{owner}/{repo}/pulls/<PR_NUMBER>/comments
gh api --paginate "repos/{owner}/{repo}/issues/<PR_NUMBER>/comments?per_page=100"

GitHub PRs are also issues, so general PR comments live on the issue comments endpoint. Greptile may edit a single general PR comment on each review cycle instead of creating a new review or comment. Always inspect the latest Greptile-authored general comment by updated_at, including any "Prompt to fix all with AI" section, before concluding that the PR is clear.

GitLab:

glab mr view <MR_IID> --output json
# Fetch discussions (inline diff comments are type "DiffNote"; general comments have null type)
glab api "projects/:fullpath/merge_requests/<MR_IID>/discussions"

For GitLab, paginate discussions if needed (add ?per_page=100&page=N).

Perforce:

# Get changelist description, files, and status
p4 describe -s <CL_NUMBER>

# Get shelved files (for in-review CLs)
p4 describe -S <CL_NUMBER>

# Get the diff of the shelved changelist
p4 diff2 //...@=<CL_NUMBER> //...@=<CL_NUMBER>

# List review comments (if using p4 review workflow)
p4 review -c <CL_NUMBER>

Key Perforce CL fields:

• Change: changelist number
• Status: pending, submitted, shelved
• Description: the CL description / commit message
• Files: list of files in the CL

3. Wait for pending checks

Before analyzing, ensure all status checks have completed. If any checks are PENDING or IN_PROGRESS (GitHub) / running or pending (GitLab), poll every 30 seconds until all checks reach a terminal state.

GitHub: poll statusCheckRollup from gh pr view.

GitLab:

glab api "projects/:fullpath/merge_requests/<MR_IID>/pipelines"

Pipeline statuses: running, pending, success, failed, canceled, skipped. Poll until no pipeline has running or pending status.

Perforce: Perforce doesn't have built-in CI checks natively. If the team uses a review tool (Swarm, etc.) or an external CI triggered by shelve events, check the relevant system. Otherwise, proceed to analysis immediately.

4. Analyze the PR/MR

Once all checks are complete, evaluate these areas:

A. Status Checks

• Are all CI checks passing?
• If any are failing, identify which ones and the failure reason.

B. PR/MR Description

• Is the description complete and follows team conventions?
• Are all required sections filled in?
• Are there TODOs or placeholders that need updating?

C. Review Comments

• Inline code review comments that need addressing
• Look for bot review comments (e.g. from greptile-apps[bot] on GitHub, or the Greptile bot user on GitLab, linters, etc.)
• Human reviewer comments
• Perforce: review comments from p4 review or external review tools

D. General Comments

• Discussion comments on the PR/MR
• For GitHub, check the issue comments endpoint and use updated_at to catch bot comments edited in place. Greptile's latest edited summary can contain actionable items even when there are no new inline comments.
• Bot comments (deploy previews, etc.) — usually informational
• Perforce: CL description should include a clear summary, affected files rationale, and testing notes

5. Categorize issues

For each issue found, categorize as:

6. Report findings

Present a summary table:

7. Fix issues (if requested)

If there are actionable items:

1. Switch to the PR/MR's branch (git) or ensure files are open in the correct CL (Perforce) if not already.
2. Ask the user if they want to fix the issues.
3. If yes, make the fixes, then:

GitHub/GitLab: commit and push:

git add <files>
git commit -m "address review feedback"
git push

Perforce: open files for edit, make changes, and re-shelve:

p4 edit <file>
# make changes
p4 shelve -f -c <CL_NUMBER>

8. Resolve review threads

After addressing comments, resolve the corresponding review threads.

Perforce — Perforce does not have a native "resolve thread" concept. Instead, mark comments as addressed by updating the CL description or by responding in the review tool being used (Swarm, etc.). If using p4 review:

# Mark files as reviewed after addressing feedback
p4 review -c <CL_NUMBER>

GitHub — fetch unresolved thread IDs (paginate if needed — see the GraphQL reference):

gh api graphql -f query='
query($cursor: String) {
  repository(owner: "OWNER", name: "REPO") {
    pullRequest(number: PR_NUMBER) {
      reviewThreads(first: 100, after: $cursor) {
        pageInfo { hasNextPage endCursor }
        nodes {
          id
          isResolved
          comments(first: 1) {
            nodes { body path }
          }
        }
      }
    }
  }
}'

If hasNextPage is true, repeat with -f cursor=ENDCURSOR to get remaining threads.

Then resolve threads that have been addressed or are informational:

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

Batch multiple resolutions into a single mutation using aliases (t1, t2, etc.).

GitLab — fetch unresolved discussions (see the GitLab API reference):

glab api "projects/:fullpath/merge_requests/<MR_IID>/discussions?per_page=100"

Filter for discussions where "resolved": false. Collect each discussion's id.

Resolve each discussion individually (GitLab has no batch resolution):

glab api --method PUT \
  "projects/:fullpath/merge_requests/<MR_IID>/discussions/<DISCUSSION_ID>" \
  --field resolved=true

Repeat for each unresolved discussion ID.

9. Multiple PRs/MRs/CLs

If checking a chain of PRs/MRs/CLs, process them sequentially.

Perforce — to check multiple changelists at once:

p4 changes -s pending -u $P4USER -c $P4CLIENT -l

Output format

Summarize:

• PR/MR/CL title or description and current state
• Platform detected (GitHub / GitLab / Perforce)
• Status checks summary (passing/failing/pending) — or N/A for Perforce
• Total issues found
• Actionable items with descriptions
• Items that can be ignored with reasons
• Recommended next steps