Copilot in Pull Requests

Leverage GitHub Copilot to generate PR summaries, automate code reviews, resolve merge conflicts, and streamline your entire pull request workflow.

How Copilot Integrates into Pull Requests

GitHub Copilot extends far beyond code completion in your editor. On GitHub.com, Copilot is deeply integrated into the pull request workflow, helping developers at every stage from creating a PR to merging it. These capabilities work directly in your browser without any IDE extensions required.

Copilot's PR integration addresses some of the most time-consuming aspects of the development workflow:

• Writing PR descriptions — Copilot analyzes your diff and generates comprehensive summaries automatically
• Reviewing code — Copilot acts as an always-available first reviewer, catching issues before human reviewers look at the code
• Answering questions — Team members can ask Copilot about specific changes directly in PR comments
• Resolving conflicts — Copilot can suggest intelligent resolutions for merge conflicts
• Generating release notes — Automatically create user-facing changelogs from your merged PRs

AI-Generated PR Summaries and Descriptions

One of the most immediately useful Copilot features is automatic PR description generation. When you create a new pull request, you will see a Copilot icon button next to the description field. Clicking it instructs Copilot to analyze every file in your diff and produce a structured summary.

The generated description typically includes:

• A one-line summary of what the PR accomplishes
• A bulleted list of the key changes organized by file or feature area
• Notes about any new dependencies, configuration changes, or migrations
• A walkthrough of the most significant code modifications

You can customize the output by including a copilot-instructions.md file in your repository's .github directory. This file can specify the format, sections, and level of detail you want in generated PR descriptions.

# .github/copilot-instructions.md

## PR Description Format
When generating PR descriptions, please include:
1. A "Summary" section with a brief overview
2. A "Changes" section with bullet points per file
3. A "Testing" section suggesting what to test
4. A "Breaking Changes" section if applicable

Always mention if database migrations are included.
Use conventional commit prefixes (feat, fix, refactor, etc.).

Copilot Code Review: Requesting AI Review on PRs

GitHub Copilot can act as an automated code reviewer on your pull requests. You can request a Copilot review just like you would request a review from a team member — by selecting "Copilot" from the reviewers dropdown in the PR sidebar.

When Copilot reviews your PR, it performs several types of analysis:

• Bug detection — Identifies potential null pointer issues, off-by-one errors, race conditions, and logic errors
• Security scanning — Flags hardcoded secrets, SQL injection risks, XSS vulnerabilities, and insecure patterns
• Performance suggestions — Points out unnecessary allocations, N+1 queries, and suboptimal algorithms
• Best practice enforcement — Highlights missing error handling, inadequate input validation, and style inconsistencies
• Documentation gaps — Suggests where comments or docstrings would improve readability

Copilot leaves its feedback as review comments on specific lines of code, just like a human reviewer. Each comment includes an explanation of the issue and often provides a suggested code fix that you can apply with one click.

# Copilot might flag this code in a review:
def get_user(user_id):
    user = db.query(f"SELECT * FROM users WHERE id = {user_id}")
    return user[0]

# Copilot suggestion:
# "SQL injection vulnerability. Use parameterized queries instead."
# Suggested fix:
def get_user(user_id):
    user = db.query("SELECT * FROM users WHERE id = %s", (user_id,))
    if not user:
        raise UserNotFoundError(f"No user found with id {user_id}")
    return user[0]

Copilot in PR Comments: Asking Questions About Changes

Beyond automated reviews, you can interact with Copilot directly in PR comments. Any collaborator on a repository can tag @github-copilot in a PR comment to ask questions about the code changes.

Common use cases for Copilot in PR comments include:

• Understanding changes — "Explain what this regex does and why it was changed"
• Suggesting alternatives — "Is there a more efficient way to implement this sorting logic?"
• Checking for edge cases — "What happens if the input list is empty?"
• Generating tests — "Write unit tests for the new validateEmail function"
• Documenting decisions — "Summarize the architectural pattern being used here"

Copilot responds in the comment thread, providing context-aware answers based on the full diff, the specific file, and the surrounding code. This makes asynchronous code reviews more productive, especially for distributed teams across time zones.

Resolving Merge Conflicts with Copilot

Merge conflicts are one of the most disruptive parts of collaborative development. GitHub Copilot can help resolve them intelligently by understanding the intent behind both conflicting changes.

When you encounter a merge conflict on GitHub.com, Copilot can:

• Analyze both sides of the conflict to understand the purpose of each change
• Suggest a merged resolution that preserves the intent of both changes
• Explain why it chose a particular resolution strategy
• Handle conflicts across multiple files with awareness of how changes relate

For simple conflicts like concurrent edits to adjacent lines, Copilot typically merges both changes correctly. For more complex semantic conflicts — such as when both branches modify the same function signature differently — Copilot presents options and explains the trade-offs.

// Branch A added validation:
function createOrder(items, customer) {
  if (!items || items.length === 0) {
    throw new Error('Order must contain at least one item');
  }
  return processOrder(items, customer);
}

// Branch B added logging:
function createOrder(items, customer) {
  logger.info(`Creating order for customer ${customer.id}`);
  return processOrder(items, customer);
}

// Copilot's suggested resolution combines both:
function createOrder(items, customer) {
  if (!items || items.length === 0) {
    throw new Error('Order must contain at least one item');
  }
  logger.info(`Creating order for customer ${customer.id}`);
  return processOrder(items, customer);
}

Auto-Generated Release Notes

GitHub can automatically generate release notes when you create a new release, and Copilot enhances this capability. The auto-generated release notes pull from merged pull request titles and descriptions to create a categorized changelog.

To configure how release notes are generated, add a .github/release.yml file to your repository:

# .github/release.yml
changelog:
  exclude:
    labels:
      - ignore-for-release
    authors:
      - dependabot
  categories:
    - title: "New Features"
      labels:
        - enhancement
        - feature
    - title: "Bug Fixes"
      labels:
        - bug
        - fix
    - title: "Performance"
      labels:
        - performance
    - title: "Documentation"
      labels:
        - documentation
    - title: "Other Changes"
      labels:
        - "*"

With this configuration and well-labeled PRs, your release notes are generated in a clean, categorized format. Copilot-generated PR descriptions feed directly into this, so the better your PR summaries are, the better your release notes become.

Copilot PR Features: Plan Comparison

Not all Copilot PR features are available on every plan. Here is a breakdown of what each tier offers: