.NET Skills for Claude Code

A comprehensive Claude Code plugin with 25 skills and 5 specialized agents for professional .NET development. Battle-tested patterns from production systems covering C#, Akka.NET, Aspire, EF Core, testing, and performance optimization.

Installation

Add the marketplace (one-time):

/plugin marketplace add Aaronontheweb/dotnet-skills

Install the plugin:

/plugin install dotnet-skills

To update:

/plugin marketplace update

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Specialized Agents

Agents are AI personas with deep domain expertise. They're invoked automatically when Claude Code detects relevant tasks.

Agent	Expertise
akka-net-specialist	Actor systems, clustering, persistence, Akka.Streams, message patterns
dotnet-concurrency-specialist	Threading, async/await, race conditions, deadlock analysis
dotnet-benchmark-designer	BenchmarkDotNet setup, custom benchmarks, measurement strategies
dotnet-performance-analyst	Profiler analysis, benchmark interpretation, regression detection
docfx-specialist	DocFX builds, API documentation, markdown linting

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Skills Library

Akka.NET

Production patterns for building distributed systems with Akka.NET.

Skill	What You'll Learn
best-practices	EventStream vs DistributedPubSub, supervision strategies, actor hierarchies
testing-patterns	Akka.Hosting.TestKit, async assertions, TestProbe patterns
hosting-actor-patterns	Props factories, IRequiredActor<T>, DI scope management in actors
aspire-configuration	Akka.NET + .NET Aspire integration, HOCON with IConfiguration
management	Akka.Management, health checks, cluster bootstrap

C# Language

Modern C# patterns for clean, performant code.

Skill	What You'll Learn
coding-standards	Records, pattern matching, nullable types, value objects, no AutoMapper
concurrency-patterns	When to use Task vs Channel vs lock vs actors
api-design	Extend-only design, API/wire compatibility, versioning strategies
type-design-performance	Sealed classes, readonly structs, static pure functions, Span<T>

Data Access

Database patterns that scale.

Skill	What You'll Learn
efcore-patterns	Entity configuration, migrations, query optimization
database-performance	Read/write separation, N+1 prevention, AsNoTracking, row limits

.NET Aspire

Cloud-native application orchestration.

Skill	What You'll Learn
integration-testing	DistributedApplicationTestingBuilder, Aspire.Hosting.Testing
service-defaults	OpenTelemetry, health checks, resilience, service discovery

ASP.NET Core

Web application patterns.

Skill	What You'll Learn
transactional-emails	MJML templates, variable substitution, Mailpit testing

.NET Ecosystem

Core .NET development practices.

Skill	What You'll Learn
project-structure	Solution layout, Directory.Build.props, layered architecture
package-management	Central Package Management (CPM), shared version variables, dotnet CLI
serialization	Protobuf, MessagePack, System.Text.Json source generators, AOT
local-tools	dotnet tool manifests, team-shared tooling
slopwatch	Detect LLM-generated anti-patterns in your codebase

Microsoft.Extensions

Dependency injection and configuration patterns.

Skill	What You'll Learn
configuration	IOptions pattern, environment-specific config, secrets management
dependency-injection	IServiceCollection extensions, scope management, keyed services

Testing

Comprehensive testing strategies.

Skill	What You'll Learn
testcontainers	Docker-based integration tests, PostgreSQL, Redis, RabbitMQ
playwright-blazor	E2E testing for Blazor apps, page objects, async assertions
crap-analysis	CRAP scores, coverage thresholds, ReportGenerator integration
snapshot-testing	Verify library, approval testing, API response validation

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Key Principles

These skills emphasize patterns that work in production:

• Immutability by default - Records, readonly structs, value objects
• Type safety - Nullable reference types, strongly-typed IDs
• Composition over inheritance - No abstract base classes, sealed by default
• Performance-aware - Span<T>, pooling, deferred enumeration
• Testable - DI everywhere, pure functions, explicit dependencies
• No magic - No AutoMapper, no reflection-heavy frameworks

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Repository Structure

dotnet-skills/
├── .claude-plugin/
│   └── plugin.json         # Plugin manifest
├── agents/                 # 5 specialized agents
│   ├── akka-net-specialist.md
│   ├── docfx-specialist.md
│   ├── dotnet-benchmark-designer.md
│   ├── dotnet-concurrency-specialist.md
│   └── dotnet-performance-analyst.md
└── skills/                 # 25 comprehensive skills
    ├── akka/               # Akka.NET (5 skills)
    ├── aspire/             # .NET Aspire (2 skills)
    ├── aspnetcore/         # ASP.NET Core (1 skill)
    ├── csharp/             # C# language (4 skills)
    ├── data/               # Data access (2 skills)
    ├── dotnet/             # .NET ecosystem (5 skills)
    ├── microsoft-extensions/  # DI & config (2 skills)
    └── testing/            # Testing (4 skills)

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Contributing

Want to add a skill or agent? PRs welcome!

1. Create skills/<category>/<skill-name>/SKILL.md (or agents/<name>/AGENT.md)
2. Add the path to .claude-plugin/plugin.json
3. Submit a PR

Skills should be comprehensive reference documents (10-40KB) with concrete examples and anti-patterns.

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Author

Created by Aaron Stannard (@Aaronontheweb)

Patterns drawn from production systems including Akka.NET, Petabridge, and Sdkbin.

License

MIT License - Copyright (c) 2025 Aaron Stannard

See LICENSE for full details.