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pr-review

Name: Pr Review
Author: juspay

// Review a GitHub PR by fetching its diff, analyzing it with momus (expert reviewer), and producing structured inline comments with file paths, line numbers, and severity levels. MUST USE when the user shares a GitHub PR link and asks for a review, says "review this PR", "look at this pull request", "give me feedback on PR

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stars:81

forks:91

updated:April 6, 2026 at 11:37

SKILL.md

readonly

name	pr-review
description	Review a GitHub PR by fetching its diff, analyzing it with momus (expert reviewer), and producing structured inline comments with file paths, line numbers, and severity levels. MUST USE when the user shares a GitHub PR link and asks for a review, says "review this PR", "look at this pull request", "give me feedback on PR

PR Review Skill

You review a GitHub PR end-to-end: fetch the diff, get expert analysis from momus, and post every review comment directly on the PR as inline GitHub comments. You do NOT stop after showing the summary — you MUST post the comments on GitHub before you are done.

Workflow

Step 1: Extract PR Information

Parse the PR identifier from the user's message:

Full URL: https://github.com/org/repo/pull/123 → extract number 123 and repo org/repo
Short form: PR #123 or #123 → use number directly
If just a number with no repo context, infer from gh repo view --json nameWithOwner -q '.nameWithOwner'

Step 2: Fetch PR Diff and Metadata

Run these commands (use --repo org/repo if the PR is in a different repo):

gh pr view <NUMBER> --json title,body,baseRefName,headRefName,files,additions,deletions,changedFiles,headRefOid
gh pr diff <NUMBER>
gh pr diff <NUMBER> --stat
gh repo view --json nameWithOwner -q '.nameWithOwner'

Save these for later — you need them to post comments:

PR_NUMBER = the PR number
COMMIT_SHA = headRefOid from the metadata
OWNER_REPO = nameWithOwner (e.g. juspay/hyperswitch-control-center)

Step 3: Send to Momus for Expert Review

Invoke momus synchronously (do NOT run in background — you need the result):

task(subagent_type="momus", run_in_background=false, load_skills=[], ...)

Prompt momus with:

Review the following GitHub Pull Request.

## PR Metadata
- Title: <title>
- Description: <body>
- Base: <baseRefName> → Head: <headRefName>
- Files changed: <changedFiles>, +<additions> -<deletions>

## Changed Files
<file list with stats>

## Full Diff
<complete diff>

## Instructions

For each issue found, return:
- file_path: exact relative path (e.g. src/components/Button.tsx)
- line_number: line in the NEW file (right side of diff, added/modified lines only)
- severity: critical | warning | suggestion | nitpick
- comment: clear, actionable description
- suggested_code: (optional) corrected snippet

Also return:
- summary: 2-3 sentence assessment
- verdict: approve | request_changes | comment_only

Return as JSON:
{
  "summary": "...",
  "verdict": "...",
  "comments": [
    { "file_path": "...", "line_number": N, "severity": "...", "comment": "...", "suggested_code": "..." }
  ]
}

Step 4: Validate Momus Output

Parse the JSON from momus
Verify each comment has file_path, line_number, severity, comment
Drop comments referencing files not in the PR's changed files list
Sort by severity: critical → warning → suggestion → nitpick

Step 5: Show Review Summary

Display to the user:

## PR Review: <title>

**Verdict**: <approve/request_changes/comment_only>
**Summary**: <summary>

### Critical (N)
- `file:line` — comment

### Warnings (N)
- `file:line` — comment

### Suggestions (N)
- `file:line` — comment

### Nitpicks (N)
- `file:line` — comment

Step 6: Post All Comments on GitHub

THIS STEP IS NOT OPTIONAL. After showing the summary, you MUST post every comment on the PR. Do not ask the user for confirmation — just post them.

6a. Validate lines are in the diff

For each comment, check the line is actually in the diff:

gh pr diff <PR_NUMBER> -- <FILE_PATH>

Line appears as a + line on the right side → post as inline comment (Step 6b)
Line is NOT in the diff → post as PR-level comment instead (Step 6c)

6b. Post inline comments

Comment bodies often contain backticks, pipes, quotes, newlines, and code fences that WILL break shell parsing if passed as -f body="...". You MUST write the JSON payload to a temp file and use --input to avoid parse errors.

For each comment, write a JSON file and post it:

# 1. Build the JSON payload and write to a temp file
cat > /tmp/pr_comment.json << 'JSONEOF'
{
  "body": "<COMMENT_BODY>",
  "commit_id": "<COMMIT_SHA>",
  "path": "<FILE_PATH>",
  "line": <LINE_NUMBER>,
  "side": "RIGHT"
}
JSONEOF

# 2. Post using --input to avoid shell escaping issues
gh api repos/<OWNER_REPO>/pulls/<PR_NUMBER>/comments \
  --method POST \
  --input /tmp/pr_comment.json

Building the body string: Construct <COMMENT_BODY> as a properly JSON-escaped string. Remember to escape:

" → \"
newlines → \n
backslashes → \\
tabs → \t

For a comment WITH suggested_code, the body should be:

**[<SEVERITY>]** <COMMENT>\n\n```suggestion\n<SUGGESTED_CODE>\n```

For a comment WITHOUT suggested_code, the body is simply:

**[<SEVERITY>]** <COMMENT>

CRITICAL: Always use the heredoc + --input pattern. NEVER pass the body as a -f body="..." argument — it will break on any comment containing backticks, pipes, or quotes.

6c. Post PR-level comments

For comments where the line is NOT in the diff, or that have no file/line, also use a temp file:

cat > /tmp/pr_comment.json << 'JSONEOF'
{
  "body": "**[<SEVERITY>]** `<FILE_PATH>:<LINE_NUMBER>` — <COMMENT>"
}
JSONEOF

gh api repos/<OWNER_REPO>/issues/<PR_NUMBER>/comments \
  --method POST \
  --input /tmp/pr_comment.json

6d. Post the overall review summary

After all inline comments are posted, post the verdict as a PR comment:

cat > /tmp/pr_comment.json << 'JSONEOF'
{
  "body": "## Review Summary\n\n**Verdict**: <VERDICT>\n\n<SUMMARY>\n\n---\n_Automated review via momus_"
}
JSONEOF

gh api repos/<OWNER_REPO>/issues/<PR_NUMBER>/comments \
  --method POST \
  --input /tmp/pr_comment.json

Step 7: Report Results

After posting, show what happened:

## Comments Posted

### Inline Comments
- `src/Button.tsx:42` — "[critical] ..." ✓
- `src/helpers.js:15` — "[warning] ..." ✓

### PR-Level Comments
- Review summary ✓

### Downgraded (line not in diff)
- `src/client.ts:200` — posted as PR comment instead

### Failed
- `src/api.ts:30` — error: <reason>

If a comment fails to post, log the error and continue with the rest.

Error Handling

gh not authenticated → tell user to run gh auth login
Invalid PR number or repo → report error clearly
Momus returns unparseable response → show raw output, ask to retry
Individual comment fails to post → log error, continue with remaining
All comments fail → suggest checking GitHub permissions
Very large PR (50+ files / 2000+ lines) → split into batches, tell the user

Important

Line numbers MUST be from the NEW file (right side of diff) — that's what GitHub expects
commit_id MUST be headRefOid — not any other commit
Preserve exact file paths from the diff — no normalizing
Fetch the FULL diff, not just filenames — momus needs actual code to review

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package.json

"author": "juspay"

"repository": "juspay/hyperswitch-control-center"

View GitHub Repository View Creator Repositories

$ install --global

$ download --local

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Software DevelopersComputer and Mathematical Occupations15-1252L4

name	pr-review
description	Review a GitHub PR by fetching its diff, analyzing it with momus (expert reviewer), and producing structured inline comments with file paths, line numbers, and severity levels. MUST USE when the user shares a GitHub PR link and asks for a review, says "review this PR", "look at this pull request", "give me feedback on PR

PR Review Skill

Workflow

Step 1: Extract PR Information

Parse the PR identifier from the user's message:

Full URL: https://github.com/org/repo/pull/123 → extract number 123 and repo org/repo
Short form: PR #123 or #123 → use number directly
If just a number with no repo context, infer from gh repo view --json nameWithOwner -q '.nameWithOwner'

Step 2: Fetch PR Diff and Metadata

Run these commands (use --repo org/repo if the PR is in a different repo):

gh pr view <NUMBER> --json title,body,baseRefName,headRefName,files,additions,deletions,changedFiles,headRefOid
gh pr diff <NUMBER>
gh pr diff <NUMBER> --stat
gh repo view --json nameWithOwner -q '.nameWithOwner'

Save these for later — you need them to post comments:

PR_NUMBER = the PR number
COMMIT_SHA = headRefOid from the metadata
OWNER_REPO = nameWithOwner (e.g. juspay/hyperswitch-control-center)

Step 3: Send to Momus for Expert Review

Invoke momus synchronously (do NOT run in background — you need the result):

task(subagent_type="momus", run_in_background=false, load_skills=[], ...)

Prompt momus with:

Review the following GitHub Pull Request.

## PR Metadata
- Title: <title>
- Description: <body>
- Base: <baseRefName> → Head: <headRefName>
- Files changed: <changedFiles>, +<additions> -<deletions>

## Changed Files
<file list with stats>

## Full Diff
<complete diff>

## Instructions

For each issue found, return:
- file_path: exact relative path (e.g. src/components/Button.tsx)
- line_number: line in the NEW file (right side of diff, added/modified lines only)
- severity: critical | warning | suggestion | nitpick
- comment: clear, actionable description
- suggested_code: (optional) corrected snippet

Also return:
- summary: 2-3 sentence assessment
- verdict: approve | request_changes | comment_only

Return as JSON:
{
  "summary": "...",
  "verdict": "...",
  "comments": [
    { "file_path": "...", "line_number": N, "severity": "...", "comment": "...", "suggested_code": "..." }
  ]
}

Step 4: Validate Momus Output

Parse the JSON from momus
Verify each comment has file_path, line_number, severity, comment
Drop comments referencing files not in the PR's changed files list
Sort by severity: critical → warning → suggestion → nitpick

Step 5: Show Review Summary

Display to the user:

## PR Review: <title>

**Verdict**: <approve/request_changes/comment_only>
**Summary**: <summary>

### Critical (N)
- `file:line` — comment

### Warnings (N)
- `file:line` — comment

### Suggestions (N)
- `file:line` — comment

### Nitpicks (N)
- `file:line` — comment

Step 6: Post All Comments on GitHub

THIS STEP IS NOT OPTIONAL. After showing the summary, you MUST post every comment on the PR. Do not ask the user for confirmation — just post them.

6a. Validate lines are in the diff

For each comment, check the line is actually in the diff:

gh pr diff <PR_NUMBER> -- <FILE_PATH>

Line appears as a + line on the right side → post as inline comment (Step 6b)
Line is NOT in the diff → post as PR-level comment instead (Step 6c)

6b. Post inline comments

For each comment, write a JSON file and post it:

# 1. Build the JSON payload and write to a temp file
cat > /tmp/pr_comment.json << 'JSONEOF'
{
  "body": "<COMMENT_BODY>",
  "commit_id": "<COMMIT_SHA>",
  "path": "<FILE_PATH>",
  "line": <LINE_NUMBER>,
  "side": "RIGHT"
}
JSONEOF

# 2. Post using --input to avoid shell escaping issues
gh api repos/<OWNER_REPO>/pulls/<PR_NUMBER>/comments \
  --method POST \
  --input /tmp/pr_comment.json

Building the body string: Construct <COMMENT_BODY> as a properly JSON-escaped string. Remember to escape:

" → \"
newlines → \n
backslashes → \\
tabs → \t

For a comment WITH suggested_code, the body should be:

**[<SEVERITY>]** <COMMENT>\n\n```suggestion\n<SUGGESTED_CODE>\n```

For a comment WITHOUT suggested_code, the body is simply:

**[<SEVERITY>]** <COMMENT>

CRITICAL: Always use the heredoc + --input pattern. NEVER pass the body as a -f body="..." argument — it will break on any comment containing backticks, pipes, or quotes.

6c. Post PR-level comments

For comments where the line is NOT in the diff, or that have no file/line, also use a temp file:

cat > /tmp/pr_comment.json << 'JSONEOF'
{
  "body": "**[<SEVERITY>]** `<FILE_PATH>:<LINE_NUMBER>` — <COMMENT>"
}
JSONEOF

gh api repos/<OWNER_REPO>/issues/<PR_NUMBER>/comments \
  --method POST \
  --input /tmp/pr_comment.json

6d. Post the overall review summary

After all inline comments are posted, post the verdict as a PR comment:

cat > /tmp/pr_comment.json << 'JSONEOF'
{
  "body": "## Review Summary\n\n**Verdict**: <VERDICT>\n\n<SUMMARY>\n\n---\n_Automated review via momus_"
}
JSONEOF

gh api repos/<OWNER_REPO>/issues/<PR_NUMBER>/comments \
  --method POST \
  --input /tmp/pr_comment.json

Step 7: Report Results

After posting, show what happened:

## Comments Posted

### Inline Comments
- `src/Button.tsx:42` — "[critical] ..." ✓
- `src/helpers.js:15` — "[warning] ..." ✓

### PR-Level Comments
- Review summary ✓

### Downgraded (line not in diff)
- `src/client.ts:200` — posted as PR comment instead

### Failed
- `src/api.ts:30` — error: <reason>

If a comment fails to post, log the error and continue with the rest.

Error Handling

gh not authenticated → tell user to run gh auth login
Invalid PR number or repo → report error clearly
Momus returns unparseable response → show raw output, ask to retry
Individual comment fails to post → log error, continue with remaining
All comments fail → suggest checking GitHub permissions
Very large PR (50+ files / 2000+ lines) → split into batches, tell the user

Important

Line numbers MUST be from the NEW file (right side of diff) — that's what GitHub expects
commit_id MUST be headRefOid — not any other commit
Preserve exact file paths from the diff — no normalizing
Fetch the FULL diff, not just filenames — momus needs actual code to review

pr-review

PR Review Skill

Workflow

Step 1: Extract PR Information

Step 2: Fetch PR Diff and Metadata

Step 3: Send to Momus for Expert Review

Step 4: Validate Momus Output

Step 5: Show Review Summary

Step 6: Post All Comments on GitHub

6a. Validate lines are in the diff

6b. Post inline comments

6c. Post PR-level comments

6d. Post the overall review summary

Step 7: Report Results

Error Handling

Important

More from this repository

More from this repository

PR Review Skill

Workflow

Step 1: Extract PR Information

Step 2: Fetch PR Diff and Metadata

Step 3: Send to Momus for Expert Review

Step 4: Validate Momus Output

Step 5: Show Review Summary

Step 6: Post All Comments on GitHub

6a. Validate lines are in the diff

6b. Post inline comments

6c. Post PR-level comments

6d. Post the overall review summary

Step 7: Report Results

Error Handling

Important