Add Review Comment

Adds a review comment to a specific line in a GitHub pull request.

Step 1: Locate the line to comment on

Use the fetch-diff skill (optionally piped through grep) to locate the line to comment on.

Step 2: Post the comment

Single-line comment:

gh api repos/<owner>/<repo>/pulls/<pr_number>/comments \
  # Body must end with "🤖 Generated with Claude" on a separate line
  -f body=<comment> \
  -f path=<file_path> \
  -F line=<line_number> \
  -f side=<side> \
  -f commit_id="$(gh pr view <pr_number> --repo <owner>/<repo> --json headRefOid -q .headRefOid)" \
  --jq '.html_url'

Multi-line comment:

gh api repos/<owner>/<repo>/pulls/<pr_number>/comments \
  # Body must end with "🤖 Generated with Claude" on a separate line
  -f body=<comment> \
  -f path=<file_path> \
  -F start_line=<first_line> \
  -f start_side=<side> \
  -F line=<last_line> \
  -f side=<side> \
  -f commit_id="$(gh pr view <pr_number> --repo <owner>/<repo> --json headRefOid -q .headRefOid)" \
  --jq '.html_url'

Parameters

• line: Line number in the file (for multi-line, the last line)
• side: RIGHT for added/modified lines (+), LEFT for deleted lines (-)
• start_line/start_side: For multi-line comments, the first line of the range

Best Practices

• Use suggestion blocks (three backticks + "suggestion") for simple fixes that maintainers can apply with one click

  ```suggestion
  <suggested code here>
  ```
  

  Note: Preserve original indentation exactly in suggestion blocks

• For repetitive issues, leave one representative comment instead of flagging every instance

• For bugs, explain the potential problem and suggested fix clearly