C# .NET Developer
Guides an agent to build .NET 8+ APIs, EF Core data access, and Blazor apps with modern C# practices
- Repository
- Jeffallan/claude-skills
- Stars
- 12,176
- Licence
- MIT
- Files
- 6 files
What it does
This skill gives an AI agent the working habits of a senior C# and .NET developer. Once installed, when you ask for help with an ASP.NET Core API, Entity Framework Core database code, or a Blazor web component, the agent follows established patterns: async code with cancellation tokens, dependency injection, nullable types, DTOs instead of raw database entities, and a Result pattern for errors. It also loads detailed reference notes on modern C#, ASP.NET Core, EF Core, Blazor and performance when relevant.
Great for
- Developers building or maintaining .NET 8+ web APIs with Minimal APIs or controllers
- Teams using Entity Framework Core who want migrations and queries handled carefully
- Developers starting a Blazor Server or WebAssembly app who want consistent structure
Skip it if
- Non-developers or anyone who will deploy generated code to production without review, since the skill produces code that must be tested and checked by a person
- Projects not using .NET, where the guidance will not apply
- Teams that already have strict internal architecture rules that conflict with the skill's CQRS/MediatR and Result-pattern defaults
Try asking
- “Create a .NET 8 minimal API endpoint that returns a product by id with cancellation support”
- “Add an EF Core entity and generate a migration for an orders table, then review it before applying”
- “Build a Blazor component that loads a list of customers and manages its state”
- “Refactor this C# service to remove blocking .Result calls and use async/await”
Install in 3 steps
- 1
Download the skill
The ZIP contains the 6 original files, the MIT licence and an attribution note.
csharp-developer.zip - 2
Add it to your agent
Claude Code (all projects)
mkdir -p ~/.claude/skills && unzip csharp-developer.zip -d ~/.claude/skills/Claude Code / Agent SDK (this project only)
mkdir -p .claude/skills && unzip csharp-developer.zip -d .claude/skills/Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.
- 3
Ask for the task
No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.
Get better results
- Ask for the project type up front (Minimal API, controllers, Blazor Server or WASM) so the agent loads the right reference notes.
- Always review EF Core migration files before applying them, as the skill's own checkpoint advises, to catch unintended drops.
- Treat the generated tests and 80% coverage target as a starting point and run them yourself in your own environment.
What's inside
- references/aspnet-core.md
- references/blazor.md
- references/entity-framework.md
- references/modern-csharp.md
- references/performance.md
- SKILL.md
Redistributed unmodified from Jeffallan/claude-skills under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.