Quarkus MCP Server Instructions (#96)

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| [Power Platform Connectors Schema Development Instructions](instructions/power-platform-connector.instructions.md) | Comprehensive development guidelines for Power Platform Custom Connectors using JSON Schema definitions. Covers API definitions (Swagger 2.0), API properties, and settings configuration with Microsoft extensions. | [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpower-platform-connector.instructions.md) [![Install in VS Code](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpower-platform-connector.instructions.md) |
| [PowerShell Cmdlet Development Guidelines](instructions/powershell.instructions.md) | PowerShell cmdlet and scripting best practices based on Microsoft guidelines | [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell.instructions.md) [![Install in VS Code](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpowershell.instructions.md) |
| [Python Coding Conventions](instructions/python.instructions.md) | Python coding conventions and guidelines | [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpython.instructions.md) [![Install in VS Code](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpython.instructions.md) |
| [Quarkus MCP Server](instructions/quarkus-mcp-server-sse.instructions.md) | Quarkus and MCP Server with HTTP SSE transport development standards and instructions | [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fquarkus-mcp-server-sse.instructions.md) [![Install in VS Code](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fquarkus-mcp-server-sse.instructions.md) |
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| [Ruby on Rails](instructions/ruby-on-rails.instructions.md) | Ruby on Rails coding conventions and guidelines | [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fruby-on-rails.instructions.md) [![Install in VS Code](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fruby-on-rails.instructions.md) |

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---
applyTo: '*'
description: 'Quarkus and MCP Server with HTTP SSE transport development standards and instructions'
---
# Quarkus MCP Server
Build MCP servers with Java 21, Quarkus, and HTTP SSE transport.
## Stack
- Java 21 with Quarkus Framework
- MCP Server Extension: `mcp-server-sse`
- CDI for dependency injection
- MCP Endpoint: `http://localhost:8080/mcp/sse`
## Quick Start
```bash
quarkus create app --no-code -x rest-client-jackson,qute,mcp-server-sse your-domain-mcp-server
```
## Structure
- Use standard Java naming conventions (PascalCase classes, camelCase methods)
- Organize in packages: `model`, `repository`, `service`, `mcp`
- Use Record types for immutable data models
- State management for immutable data must be managed by repository layer
- Add Javadoc for public methods
## MCP Tools
- Must be public methods in `@ApplicationScoped` CDI beans
- Use `@Tool(name="tool_name", description="clear description")`
- Never return `null` - return error messages instead
- Always validate parameters and handle errors gracefully
## Architecture
- Separate concerns: MCP tools → Service layer → Repository
- Use `@Inject` for dependency injection
- Make data operations thread-safe
- Use `Optional<T>` to avoid null pointer exceptions
## Common Issues
- Don't put business logic in MCP tools (use service layer)
- Don't throw exceptions from tools (return error strings)
- Don't forget to validate input parameters
- Test with edge cases (null, empty inputs)