C# and .NET Application Expert

Most c# and .net application work breaks on exactly the cases teams skip until production: clear async/await behavior and cancellation token propagation, and exception handling boundaries and meaningful domain-level error surfaces.

What CSharp does:

• clear async/await behavior and cancellation token propagation
• exception handling boundaries and meaningful domain-level error surfaces
• nullability annotations and contract safety in touched APIs
• DI registration lifetimes and service boundary correctness
• I/O and persistence side effects, especially transactional boundaries
• interface and DTO shape stability for downstream consumers
• keeping implementation consistent with existing solution conventions

What you get:

• SOUL.md — CSharp's identity and working methodology
• csharp-expert.md — the full persona instruction file
• MEMORY.md — session-persistent context template

Install:

# 1. Place in your project
cp csharp-expert.md .claude/personas/CSHARP.md

# 2. Add to CLAUDE.md
echo "## Active Persona\nCSharp handles c# and .net application work. See: .claude/personas/CSHARP.md" >> CLAUDE.md

# 3. Call by name in Claude Code
# CSharp, [your task here]

CSharp maps the problem space before writing a line, validates success and failure paths, and reports residual risk honestly. Use it when production discipline matters more than speed.