Claude Code Skills For C Sharp Dotnet (2026)

C# and .NET development involves repetitive patterns that Claude Code skills can automate. From scaffolding projects to generating unit tests and API documentation, these skills integrate directly into your development workflow. This guide covers practical skills for .NET developers who want to speed up common tasks.

xlsx: Spreadsheet Automation for Data-Driven Development

The xlsx skill handles spreadsheet operations tracking metrics, test coverage, or sprint data.

// Generate a bug tracking spreadsheet programmatically
// The skill creates formulas, charts, and formatted tables
"Bug report spreadsheet with columns: ID, Severity, Status, Assignee, Created Date"

This skill proves valuable when importing/exporting data between your .NET application and Excel. Generate reports with pivot tables, conditional formatting based on severity levels, and automated calculations.

docx: Technical Documentation Generation

The docx skill creates professional Word documents from your .NET project documentation.

// Generate API documentation or technical specs
"Create a specification document for the UserAuthentication service"

This skill supports:

  • Technical design documents
  • API documentation with code samples
  • Conversion from markdown to formatted Word files
  • Preservation of formatting across documents

For .NET projects with extensive XML documentation comments, docx can transform those into polished documentation.

pdf: PDF Generation and Manipulation

The pdf skill handles PDF operations for reports, invoices, and documentation in .NET applications.

// Generate PDF reports from structured data
"Create a quarterly performance report PDF with charts and tables"

This skill works well for:

  • Invoice generation systems
  • Report exports
  • Converting documentation to PDF format
  • Merging multiple documents into single PDFs

pptx: Presentation Creation

The pptx skill builds presentations for architecture reviews, sprint demos, and technical training.

// Create architecture diagrams or demo slides
"Generate a slide deck explaining the microservices architecture"

Presentations generated by this skill include proper formatting, speaker notes, and can incorporate data visualizations from your .NET application.

webapp-testing: Automated Testing for .NET Applications

The webapp-testing skill helps verify frontend functionality in ASP.NET Core applications.

Test API endpoints and UI components
"Verify the user login endpoint returns 200 OK with valid credentials"

This skill supports:

  • API endpoint testing
  • Form submission validation
  • UI behavior verification
  • Browser automation for integration tests
// Example test case generated by the skill
[Fact]
public async Task Login_WithValidCredentials_ReturnsSuccess()
{
 var client = _factory.CreateClient();
 var response = await client.PostAsJsonAsync("/api/auth/login", 
 new { Email = "[email protected]", Password = "validpassword" });
 
 Assert.Equal(HttpStatusCode.OK, response.StatusCode);
}

mcp-builder: Building Model Context Protocol Servers

The mcp-builder skill helps create MCP servers that extend Claude Code capabilities for .NET services.

// Scaffold an MCP server for your .NET API
"Create an MCP server that exposes database query capabilities"

This skill generates:

  • Server infrastructure code
  • Tool definitions for Claude Code
  • Authentication handlers
  • Response formatting logic

Many .NET developers use this to build custom integrations between Claude Code and internal systems.

Consistent Styling for Applications

Claude Code helps apply consistent visual themes across your documentation and presentations. Describe your brand requirements and Claude will apply them to generated artifacts.

Apply a theme to match your application
"Apply a dark theme with blue accents to these slides"

For .NET developers building enterprise applications, this approach ensures consistency between documentation, presentations, and UI mockups.

Project Documentation and Updates

Claude Code helps generate status reports, sprint updates, and technical documentation through direct prompting.

Generate a status report from task data
"Sprint 12 status report: completed user auth, started payment integration"

This produces:

  • Sprint summaries
  • Technical decision records
  • Incident reports
  • Project updates for stakeholders

Combining Skills in .NET Workflows

The real productivity gains appear when chaining skills together. Here is a practical workflow:

  1. Use mcp-builder to create a custom MCP server for your domain
  2. Apply webapp-testing to verify new API endpoints
  3. Generate documentation with docx and pdf
  4. Create presentation slides with pptx for sprint reviews
  5. Track metrics in spreadsheets using xlsx
// This workflow reduces context switching between tools
// All within Claude Code, no IDE switching required

Practical Example: Building a Feature End-to-End

Consider adding a new payment processing module to your .NET application:

Step 1: Scaffold the domain models
"Create C# record types for Payment, PaymentMethod, and Transaction"
Step 2: Write unit tests first
"Generate xUnit tests for the PaymentService with mock dependencies"
Step 3: Document the API
"Create API documentation for the payment endpoints in Word format"
Step 4: Generate test reports
"Spreadsheet tracking payment test coverage by feature"

Each step stays within Claude Code, maintaining your development flow without jumping between tools.

Choosing Skills Based on Your .NET Role

Different developer roles benefit from different skill combinations:

  • Backend developers: xlsx, docx, pdf, mcp-builder
  • Full-stack developers: Add webapp-testing for frontend verification
  • Tech leads: pptx for presentations, docx for documentation
  • Architects: pdf for design documentation, canvas-design for visual artifacts

Start with skills matching your most frequent tasks. As your workflow matures, add skills that address new problems.

Summary

Claude Code skills for .NET development focus on automation, documentation, and testing. The xlsx skill handles spreadsheet operations, docx and pdf generate documentation, webapp-testing verifies application behavior, and mcp-builder creates custom integrations. Combine these skills to reduce repetitive tasks and maintain focus on solving domain problems.

tdd Skill for .NET Test-Driven Development

The tdd skill integrates directly with .NET’s testing ecosystem. xUnit, NUnit, and MSTest. to guide test-first development workflows. Rather than writing implementation code and then backfilling tests, the tdd skill prompts you to define test cases before writing a single line of production code, which leads to cleaner interfaces and better separation of concerns.

A typical xUnit test suite generated by the tdd skill for a .NET service:

// OrderCalculatorTests.cs. generated before implementation exists
using Xunit;
using Moq;
using MyApp.Services;
using MyApp.Models;
public class OrderCalculatorTests
{
 private readonly Mock<ITaxService> _taxServiceMock;
 private readonly OrderCalculator _sut;
 public OrderCalculatorTests()
 {
 _taxServiceMock = new Mock<ITaxService>();
 _sut = new OrderCalculator(_taxServiceMock.Object);
 }
 [Fact]
 public void Calculate_SingleItem_ReturnsCorrectSubtotal()
 {
 var items = new[] { new LineItem { UnitPrice = 25.00m, Quantity = 3 } };
 _taxServiceMock.Setup(t => t.GetRate("US-CA")).Returns(0.0875m);
 var result = _sut.Calculate(items, taxRegion: "US-CA");
 Assert.Equal(75.00m, result.Subtotal);
 Assert.Equal(6.56m, result.TaxAmount); // 75 * 0.0875 rounded
 Assert.Equal(81.56m, result.Total);
 }
 [Fact]
 public void Calculate_EmptyItems_ThrowsArgumentException()
 {
 Assert.Throws<ArgumentException>(() =>
 _sut.Calculate(Array.Empty<LineItem>(), "US-CA"));
 }
 [Theory]
 [InlineData(0)]
 [InlineData(-1)]
 public void Calculate_ZeroOrNegativeQuantity_ThrowsArgumentException(int quantity)
 {
 var items = new[] { new LineItem { UnitPrice = 10.00m, Quantity = quantity } };
 Assert.Throws<ArgumentException>(() =>
 _sut.Calculate(items, "US-CA"));
 }
}

These tests define the OrderCalculator interface before it exists. The test class specifies the constructor signature (dependency injection via ITaxService), the method signature (Calculate(items, taxRegion)), and the return type structure (Subtotal, TaxAmount, Total). Implementing the class to satisfy these tests produces code that is already injectable and testable by design.

Managing NuGet Dependencies with Claude Code

.NET projects accumulate NuGet dependencies quickly, and keeping them current without introducing breaking changes is time-consuming to do manually. Claude Code can scan your .csproj files and identify outdated packages, packages with known vulnerabilities, and packages that can be consolidated when multiple packages serve the same purpose.

A practical workflow using the dotnet CLI with Claude Code assistance:

List all outdated packages across the solution
dotnet list package --outdated --include-transitive
Check for known vulnerabilities
dotnet list package --vulnerable --include-transitive
Example output Claude Code can analyze:
> Project MyApp.API
 [net8.0]:
 Top-level Package Requested Resolved Latest
 > Newtonsoft.Json 12.0.3 12.0.3 13.0.3
 > Microsoft.EntityFrameworkCore 6.0.0 6.0.0 8.0.2

When Claude Code sees this output, it can prioritize the upgrade order. EF Core 6 to 8 is a major version bump with breaking changes that requires a migration guide, while Newtonsoft.Json 12 to 13 is a safer upgrade. It can also identify when Microsoft.EntityFrameworkCore and Microsoft.EntityFrameworkCore.SqlServer need to be upgraded together to avoid version mismatch runtime errors.

For projects that cannot upgrade immediately, Claude Code can generate a suppression file documenting why specific packages remain at older versions and when they are scheduled for upgrade:

<!-- NuGetAuditSuppress.xml. track intentionally pinned packages -->
<NuGetAuditSuppress>
 <PackageRestore Include="Microsoft.EntityFrameworkCore" Version="[6.0.0]">
 <Reason>EF8 migration blocked by Q2 database schema work. Revisit after 2026-06-01.</Reason>
 </PackageRestore>
</NuGetAuditSuppress>

This keeps your audit clean by distinguishing “we haven’t gotten to this yet” from “we have reviewed this and are intentionally waiting,” which matters for compliance reviews and security audits.

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