Sentry Investigator MCP (Ruby-Focused)

A Model Context Protocol (MCP) server that automatically reads Sentry issues, investigates them by analyzing your Ruby codebase, explains why issues happened, and provides fix suggestions tailored for Ruby applications.

🚀 Features

• 🔍 Sentry Integration: Fetch and analyze issues directly from your Sentry projects

• 💎 Ruby-Focused Analysis: Specialized support for Ruby, Rails, and ERB files

• 📊 Codebase Analysis: Automatically analyze your Ruby code to understand issue context

• 🧠 Smart Investigation: Combine Sentry data with Ruby code analysis for comprehensive insights

• 🔧 Ruby Fix Suggestions: Get specific, actionable fix recommendations for Ruby errors

• 📈 Impact Analysis: Understand user impact and frequency patterns

• ⚡ Stack Trace Analysis: Deep dive into Ruby stack traces with code context

📋 Prerequisites

• Node.js 18 or higher

• A Sentry account with API access

• Ruby/Rails project (primary focus)

• Cursor editor (or any MCP-compatible client)

⚙️ Installation

1. Clone or download this MCP server:

git clone https://github.com/doraemon0905/sentry-mcp
cd sentry-mcp

2. Install dependencies:

npm install

3. Build the project:

npm run build

🔧 Setup

1. Get Sentry API Token

1. Go to Sentry (https://your_domain.sentry.io) → Settings → Personal Tokens

2. Create a new token with the following scopes:

   • org:read

   • project:read

   • event:read

   • alerts:read

   • team:read

2. Configure Cursor

Add the MCP server to your Cursor configuration. Edit your MCP settings file:

On macOS/Linux: ~/.cursor/mcp.json
On Windows: %APPDATA%\Cursor\mcp.json

{
  "mcpServers": {
    "sentry-investigator": {
      "command": "node",
      "args": ["/path/to/sentry-mcp/dist/index.js"],
      "env": {
        "SENTRY_AUTH_TOKEN": "your-sentry-auth-token-here",
        "SENTRY_ORGANIZATION": "your-sentry-org-slug",
        "SENTRY_PROJECT": "your-default-project-slug"
      }
    }
  }
}

Required Environment Variables:

• SENTRY_AUTH_TOKEN: Your Sentry API token

• SENTRY_ORGANIZATION: Your Sentry organization slug

• SENTRY_PROJECT: (Optional) Your default project slug

Replace /path/to/sentry-mcp with the actual path to this project.

3. Restart Cursor

Restart Cursor to load the new MCP server.

🎯 Usage

1. List Recent Issues

Use the get_sentry_issues tool to fetch recent issues:
- project: (optional) Specific project slug
- limit: Number of issues (default: 10, max: 100)
- status: unresolved, resolved, or ignored (default: unresolved)

2. Investigate an Issue

Use the investigate_issue tool with:
- issue_id: The Sentry issue ID
- codebase_path: Path to your Ruby codebase (default: current directory)
- include_fix: Whether to include fix suggestions (default: true)

3. Analyze Stack Traces

Use the analyze_stack_trace tool to analyze any Ruby stack trace:
- stack_trace: The stack trace text
- codebase_path: Path to your Ruby codebase (default: current directory)

🔧 Available Tools

📝 Example Investigation Report

When you investigate a Ruby issue, you'll get a comprehensive report including:

# 🐛 Issue Investigation Report

**Issue:** NoMethodError: undefined method `name' for nil:NilClass
**ID:** 12345 (PROJ-1AB)
**Status:** unresolved
**Level:** error
**Occurrences:** 45 (12 users affected)
**First Seen:** 2024-01-15 10:30:00
**Last Seen:** 2024-01-20 15:45:00

## 🔍 Stack Trace Analysis

**Parsed Stack Trace:**
1. `get_user_data`
   📁 app/services/user_service.rb:25

### 📄 `app/services/user_service.rb` (Line 25)

```ruby
  23: def get_user_data(user_id)
  24:   user = User.find_by(id: user_id)
→ 25:   user.name # Error occurs here
  26: end

🔧 Function: get_user_data

💡 Issue Analysis

Error Type: NoMethodError Ruby error caused by trying to call a method on a nil object.

Frequency Analysis: Medium frequency (9 occurrences/day) Impact Level: 🟡 Medium (12 users affected)

🔧 Suggested Fixes

NoMethodError Fix

# Add method existence checks
if user.respond_to?(:name)
  user.name
else
  # Handle missing method case
end

# Or use safe navigation
user&.name

🛠️ Development

Project Structure

src/
├── index.ts              # Main MCP server entry point
├── services/
│   ├── SentryService.ts      # Sentry API integration
│   ├── CodebaseAnalyzer.ts   # Ruby-focused code analysis utilities  
│   └── IssueInvestigator.ts  # Main investigation logic

Ruby Language Support

The MCP is optimized for Ruby applications and includes:

• File Types: .rb, .erb, .rake files

• Stack Trace Parsing: Ruby-specific error format recognition

• Method Detection: Ruby method definitions (def, self., lambdas, procs)

• Import Analysis: require, require_relative, include, extend, gem statements

• Error Types: NoMethodError, NameError, ArgumentError, TypeError, etc.

• Fix Suggestions: Ruby-specific error handling patterns

Scripts

• npm run build - Build the TypeScript project

• npm run dev - Build in watch mode for development

• npm start - Run the built server

Building from Source

npm install
npm run build

🤝 Contributing

1. Fork the repository

2. Create a feature branch

3. Make your changes

4. Add tests if applicable

5. Submit a pull request

📄 License

MIT License - see LICENSE file for details.

🆘 Troubleshooting

Common Issues

"Sentry service not configured"

• Ensure SENTRY_AUTH_TOKEN and SENTRY_ORGANIZATION environment variables are set in your MCP configuration

• Verify your API token has the correct permissions

"No project specified and no default project configured"

• Either specify a project in the tool call or set SENTRY_PROJECT environment variable

"Failed to connect to Sentry"

• Check your API token and organization slug

• Ensure your network allows HTTPS requests to sentry.io

"File not found in codebase"

• Verify the codebase_path parameter points to your Ruby project root

• Some files in stack traces may be from gems or external libraries

Ruby-Specific Notes

• The analyzer prioritizes Ruby files (.rb, .erb, .rake) over other file types

• Stack trace parsing is optimized for Ruby error formats

• Method suggestions focus on Ruby patterns and best practices

• Excludes common Ruby directories (vendor/, tmp/) from analysis

🔗 Links

• Sentry API Documentation

• Model Context Protocol

• Cursor Documentation

• Ruby Documentation

• Rails Guides