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GitHub PR Diff

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Integrates with GitHub's Pull Request API to extract diff content, enabling automated code review and analysis workflows.

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GitHub Integration

The GitHub MCP server provides functionality to extract diffs from Pull Requests.

Available Tools

get_diff_pr

Retrieves the diff content from a GitHub Pull Request.

Parameters:

  • owner: Repository owner/organization name
  • repo: Repository name
  • pr_number: Pull Request number

Returns: Object containing:

  • content: String containing the PR diff

Authentication

Required: Set the GitHub Personal Access Token as an environment variable:

export GITHUB_TOKEN=<your-github-token>

The token needs at least repo scope permissions to access private repositories. For public repositories, a token with public_repo scope is sufficient.

Error Handling

The server implements standard error handling:

  • Missing/invalid token returns ErrorCode.AuthenticationError
  • Invalid repository details return ErrorCode.InvalidParams
  • Non-existent PR returns ErrorCode.NotFound
  • Failed diff fetches return formatted error messages
  • Graceful shutdown on SIGINT

Technical Details

  • Built using the Highlight AI MCP SDK
  • Uses GitHub REST API v3
  • Input validation via Zod
  • Runs as a stdio-based MCP server
  • Supports Node.js >=18.0.0

Limitations

  • Rate limits apply based on GitHub API restrictions
  • Large diffs may be truncated according to GitHub API limits
  • Token requires appropriate repository access permissions

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