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GitHub PR Diff MCP

Model Context Protocol Integration

Overview

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

GitHub PR Diff

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

Installation Instructions

README: https://github.com/highlight-ing/highlight-github-mcp

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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