AI Agents · Lesson

Automated PR Review Comments

Reading PR diffs and posting inline review comments via API.

What Is Automated PR Review?

An automated PR review agent reads changed files, analyzes diffs, and posts targeted review comments — just like a human reviewer, but faster and consistent. Use cases: security scanning, style enforcement, detecting common bugs, checking test coverage, or summarizing what a PR does.

from github import Github
import os

g = Github(token=os.environ['GITHUB_TOKEN'])
repo = g.get_repo('myorg/myrepo')

# Get a specific pull request by number
pr = repo.get_pull(42)
print(f'PR #{pr.number}: {pr.title}')
print(f'Author: {pr.user.login}')
print(f'Base branch: {pr.base.ref} <- Head: {pr.head.ref}')
print(f'State: {pr.state}')
print(f'Changed files: {pr.changed_files}')
print(f'Additions: +{pr.additions}')
print(f'Deletions: -{pr.deletions}')

Listing Open Pull Requests

Use repo.get_pulls() to list PRs. Filter by state (open, closed), base branch, or sort order. For a review bot, you typically process open PRs that haven't been reviewed yet.

from github import Github
import os

g = Github(token=os.environ['GITHUB_TOKEN'])
repo = g.get_repo('myorg/myrepo')

# All open PRs targeting main
open_prs = repo.get_pulls(
    state='open',
    base='main',
    sort='created',
    direction='desc'
)

for pr in open_prs:
    # Check if agent has already reviewed it
    reviews = list(pr.get_reviews())
    agent_reviewed = any(
        r.user.login == 'my-agent-bot[bot]'
        for r in reviews
    )
    if not agent_reviewed:
        print(f'Needs review: PR #{pr.number} - {pr.title}')

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