DiffPilot

🚀 DiffPilot

MCP Server for AI-Powered PR Code Review

Works with GitHub Copilot, Claude, Azure DevOps, TFS • 100% Local • Zero Dependencies

Features • Installation • Tools • Configuration

🎯 What is DiffPilot?

DiffPilot is an MCP (Model Context Protocol) server that provides AI-powered PR code review and developer productivity tools. It runs locally and works with any MCP-compatible AI client.

Key Benefits

• 🔍 Auto Branch Detection - Automatically detects your base branch
• 📝 Smart PR Generation - Conventional commit titles & comprehensive descriptions
• 🔐 Secret Scanning - Detects API keys, passwords, tokens before commit
• 🧪 Test Suggestions - Analyzes code patterns and recommends test cases
• ⚡ Zero Dependencies - Only uses .NET BCL, no external packages

✨ Features

Feature	Description
🔄 PR Diff	Get diff between branches
📊 Code Review	AI-structured diff output for review
🏷️ PR Title	Conventional commit format titles
📋 PR Description	Full description with checklist
💬 Commit Message	Generate from staged/unstaged changes
🔐 Secret Scan	Detect API keys, passwords, tokens
📈 Diff Stats	Lines added/removed, file breakdown
🧪 Test Suggestions	Pattern-based test case recommendations
📝 Changelog	Keep a Changelog format from commits

⚡ Installation

VS Code Extension (Recommended)

• Install from VS Code Marketplace
• The extension automatically registers as an MCP server
• Use with GitHub Copilot Agent Mode or any MCP client

Manual Setup

# Prerequisites: .NET 9 SDK, Git

# Clone and build
git clone https://github.com/bkalafat/DiffPilot.git
cd DiffPilot
dotnet build

# Run tests
dotnet test

# Run server
dotnet run

MCP Client Configuration

{
  "mcpServers": {
    "diffpilot": {
      "command": "dotnet",
      "args": ["run", "--project", "/path/to/DiffPilot"],
      "cwd": "/your/git/repository"
    }
  }
}

🛠️ Tools

PR Review Tools

Tool	Purpose
get_pr_diff	Raw diff between branches
review_pr_changes	Diff with AI review instructions
generate_pr_title	Conventional PR title (feat/fix/refactor)
generate_pr_description	Full PR description with checklist

Developer Tools

Tool	Purpose
generate_commit_message	Commit message from staged/unstaged changes
scan_secrets	Detect API keys, passwords, tokens
diff_stats	Change statistics (lines, files, types)
suggest_tests	Test case recommendations
generate_changelog	Changelog from commits (Keep a Changelog)

⚙️ Configuration

VS Code Settings

{
  "diffpilot.dotnetPath": "dotnet",
  "diffpilot.serverPath": "",
  "diffpilot.defaultBaseBranch": "main",
  "diffpilot.prTitleStyle": "conventional",
  "diffpilot.commitMessageStyle": "conventional"
}

📖 Usage Examples

# Get PR diff
"Show me the changes compared to main branch"

# Code review
"Review this PR for security and performance issues"

# Generate PR title
"Suggest a PR title for these changes"

# Scan for secrets
"Check if there are any secrets in my changes"

# Generate commit message
"Create a commit message for my staged changes"

🏗️ Architecture

DiffPilot/
├── src/
│   ├── Program.cs           # Entry point (JSON-RPC loop)
│   ├── Git/GitService.cs    # Git command execution
│   ├── Protocol/            # JSON-RPC & MCP handlers
│   └── Tools/               # Tool implementations
├── tests/                   # Unit tests
└── vscode-extension/        # VS Code extension wrapper

Tech Stack: C# 13 / .NET 9 | JSON-RPC 2.0 | MCP stdio | xUnit

📄 License

MIT License - see LICENSE file.

GitHub • VS Code Marketplace • @bkalafat

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