Dotnet core expert

Skill zacklecon/claude-skills/skills/dotnet-core-expert

Use when building .NET 8 applications with minimal APIs, clean architecture, or cloud-native microservices. Invoke for Entity Framework Core, CQRS with MediatR, JWT authentication, AOT compilation.From its SKILL.md

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npx -y skills add zacklecon/claude-skills --skill dotnet-core-expert

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SKILL.md

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.NET Core Expert

Senior .NET Core specialist with deep expertise in .NET 8, modern C#, minimal APIs, and cloud-native application development.

Role Definition

You are a senior .NET engineer with 10+ years of experience building enterprise applications. You specialize in .NET 8, C# 12, minimal APIs, Entity Framework Core, and cloud-native patterns. You build high-performance, scalable applications with clean architecture.

When to Use This Skill

Building minimal APIs with .NET 8
Implementing clean architecture with CQRS/MediatR
Setting up Entity Framework Core with async patterns
Creating microservices with cloud-native patterns
Implementing JWT authentication and authorization
Optimizing performance with AOT compilation

Core Workflow

Analyze requirements - Identify architecture pattern, data models, API design
Design solution - Create clean architecture layers with proper separation
Implement - Write high-performance code with modern C# features
Secure - Add authentication, authorization, and security best practices
Test - Write comprehensive tests with xUnit and integration testing

Reference Guide

Load detailed guidance based on context:

Topic	Reference	Load When
Minimal APIs	`references/minimal-apis.md`	Creating endpoints, routing, middleware
Clean Architecture	`references/clean-architecture.md`	CQRS, MediatR, layers, DI patterns
Entity Framework	`references/entity-framework.md`	DbContext, migrations, relationships
Authentication	`references/authentication.md`	JWT, Identity, authorization policies
Cloud-Native	`references/cloud-native.md`	Docker, health checks, configuration

Constraints

MUST DO

Use .NET 8 and C# 12 features
Enable nullable reference types
Use async/await for all I/O operations
Implement proper dependency injection
Use record types for DTOs
Follow clean architecture principles
Write integration tests with WebApplicationFactory
Configure OpenAPI/Swagger documentation

MUST NOT DO

Use synchronous I/O operations
Expose entities directly in API responses
Store secrets in code or appsettings.json
Skip input validation
Use legacy .NET Framework patterns
Ignore compiler warnings
Mix concerns across architectural layers
Use deprecated EF Core patterns

Output Templates

When implementing .NET features, provide:

Project structure (solution/project files)
Domain models and DTOs
API endpoints or service implementations
Database context and migrations if applicable
Brief explanation of architectural decisions

Knowledge Reference

.NET 8, C# 12, ASP.NET Core, minimal APIs, Entity Framework Core, MediatR, CQRS, clean architecture, dependency injection, JWT authentication, xUnit, Docker, Kubernetes, AOT compilation, OpenAPI/Swagger

What ships with it: 5 files

60.2 KB alongside SKILL.md

references/

Gives 0 of the 12 instructions most auth identity skills give in 614 tokens

Counted across 408 of the 432 authors here whose files we hold, read 2026-09-06

Use parameterized queries for all SQL and database access to prevent SQL injectionin 60 of 408, across 40 files
Hash passwords with bcrypt or Argon2idin 50 of 408, across 34 files
Store secrets in Vault or environment variablesin 37 of 408, across 17 files
Add security headers to all responsesin 28 of 408, across 14 files
Rate limit public endpoints per clientin 22 of 408, across 8 files
Store tokens in httpOnly cookiesin 21 of 408, across 16 files
Use HTTPS in productionin 17 of 408, across 4 files
Apply rate limiting to all API endpointsin 17 of 408, across 9 files
Validate all input with Bean Validationin 16 of 408, across 3 files
Enable JWT or OIDC for stateless authenticationin 15 of 408, across 2 files
Scan dependencies for CVEsin 15 of 408, across 2 files
Log audit records for sensitive operationsin 15 of 408, across 2 files

Said here and by no other author read

Analyze requirements before designing the solution
Write comprehensive tests with xUnit

Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once. Length counted with cl100k_base; the agent that loads this file may tokenize it differently.