name: coder.datafactory-style description: "C# coding standards and conventions for DataFactory.MCP. Use when writing or reviewing C# code."

Coding Style — DataFactory.MCP

Project Settings

• Target: net10.0
• Nullable: enabled (project-wide)
• Implicit usings: enabled
• License: MIT

Conventions

Naming

File Organization

• One primary class per file
• File name matches class name
• Tools in Tools/, Services in Services/, Models in Models/
• Interfaces in Abstractions/

Null Safety

• Nullable is ON — respect nullable annotations
• Use ? for nullable types, ! only when provably non-null
• Prefer pattern matching: if (value is not null)
• Never suppress #pragma warning disable for nullable without justification

Error Handling

• Catch specific exceptions, not Exception broadly
• Translate API errors to meaningful MCP error responses
• Always check auth state before API calls
• Log errors with context (operation name, resource ID)

Async/Await

• All I/O operations must be async
• Use ConfigureAwait(false) in library code (Core project)
• Never use .Result or .Wait() — always await

Dependency Injection

• All services registered in DI container via extension methods in Extensions/
• Constructor injection only
• Depend on interfaces (Abstractions/), not concrete types

Key Patterns

Tool → Service → Model

Tool (MCP schema + validation) → Service (API call) → Model (data)

• Tools handle: parameter parsing, validation, MCP response formatting
• Services handle: HTTP calls, auth tokens, error translation
• Models handle: data shape (DTOs, no logic)

Configuration

• Feature flags control tool availability
• API versions managed in Configuration/ classes
• Environment variables for auth settings