Diffpilot

Local AI Code Review Before You Push

.NET 9 VS Code MCP License: MIT

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💡 Why DiffPilot?

Review your code locally before creating a PR. DiffPilot is an MCP server that lets you:

1. Self-Review Before PR - Run AI code review on your local changes after your last commit, before pushing
2. Reviewer Workflow - As a code reviewer, checkout the source branch locally and get AI-assisted review
3. Auto Branch Detection - No need to specify main - DiffPilot finds your base branch automatically

🔒 100% Local - No cloud, no external APIs. Works with Azure DevOps, TFS, air-gapped environments.

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🚀 Quick Start

Install

# VS Code Marketplace
ext install BurakKalafat.diffpilot

# Or NuGet (.NET tool)
dotnet tool install -g DiffPilot

Use with GitHub Copilot

# Review my changes (auto-detects base branch)
@workspace #review_pr_changes

# Review with focus areas
@workspace #review_pr_changes focus on security and error handling

# Generate commit message
@workspace #generate_commit_message

# Scan for secrets before committing
@workspace #scan_secrets

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🛠️ 9 MCP Tools

PR Review Tools

Tool	Example Prompt
#get_pr_diff	"Show diff between my branch and main"
#review_pr_changes	"Review my PR for security issues"
#generate_pr_title	"Generate a conventional PR title"
#generate_pr_description	"Create PR description with checklist"

Developer Tools

Tool	Example Prompt
#generate_commit_message	"Generate commit message for staged changes"
#scan_secrets	"Check for API keys in my changes"
#diff_stats	"Show change statistics"
#suggest_tests	"What tests should I write?"
#generate_changelog	"Generate changelog from commits"

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✨ Key Features

Feature	Description
🔄 Auto Branch Detection	Automatically finds main, master, or develop
🔐 Secret Scanning	Detects API keys, passwords, tokens, JWT
📊 Diff Statistics	Lines added/removed, file breakdown by type
🧪 Test Suggestions	Pattern-based test case recommendations
📝 Conventional Commits	Generate feat:, fix:, refactor: messages
🛡️ Enterprise Security	Bank-grade input validation, rate limiting, output sanitization

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🛡️ Security

DiffPilot implements enterprise-grade security features:

Security Feature	Description
Input Validation	All parameters validated against strict patterns
Injection Prevention	Command injection, path traversal protection
Output Sanitization	Auto-redacts secrets from tool outputs
Rate Limiting	Prevents DoS attacks (120 req/min)
Secure Errors	No internal details exposed to clients
Audit Logging	Security events logged to stderr

Auto-Redacted Patterns: API keys, AWS credentials, GitHub/Slack tokens, JWTs, passwords, private keys, connection strings.

See SECURITY.md for full documentation.

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📋 Use Cases

1. Self-Review Before PR

# After finishing your work, before creating PR:
@workspace #review_pr_changes

# AI reviews your changes and provides feedback
# Fix issues locally, then push with confidence

2. Code Reviewer Workflow

# Checkout the feature branch locally
git checkout feature/user-auth

# Use DiffPilot to review
@workspace #review_pr_changes focus on security

# Get structured review with AI assistance

3. Pre-Commit Secret Check

@workspace #scan_secrets

# Catches API keys, passwords, tokens before they're committed

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⚙️ Configuration

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

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📦 Installation Options

Method	Command
VS Code	ext install BurakKalafat.diffpilot
NuGet	dotnet tool install -g DiffPilot
Manual	git clone + dotnet build

Requirements: .NET 9 SDK, VS Code 1.101+, Git

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📜 Version History

1.2.0 (2025-12-09)

• Security Hardening - Bank-grade security features
  • Input validation (CWE-20)
  • Command injection prevention (CWE-78)
  • Path traversal protection (CWE-22)
  • Output sanitization - auto-redacts secrets (CWE-200)
  • Rate limiting (CWE-400)
  • Secure error handling
• Added SECURITY.md documentation
• 80 new security unit tests

1.1.5 (2025-12-08)

• Updated README with use cases and #tool prompts
• Highlighted auto branch detection

1.1.4 (2025-12-07)

• Icon refinements

1.1.3 (2025-12-07)

• New extension icon (lens with plus/minus)

1.1.2 (2025-12-07)

• Optimized package size

1.1.1 (2025-12-07)

• Updated extension icon

1.1.0 (2025-12-07)

• Improved tool documentation

1.0.9 (2025-12-07)

• Fixed: Server uses workspace folder for git operations

1.0.8 (2025-12-07)

• Shortened tool descriptions for cleaner UI

1.0.7 (2025-12-07)

• Fixed: Bundled server includes TargetFramework

1.0.6 (2025-12-07)

• Fixed: MCP auto-registration for VS Code 1.101+

1.0.5 (2025-12-07)

• Published to NuGet and MCP Registry

1.0.0 (2025-12-06)

• Initial release with 9 MCP tools

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📄 License

MIT License - Burak Kalafat

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GitHub • VS Code Marketplace • NuGet

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