fusengine/solid-csharp
plugins/solid/skills/solid-csharp/SKILL.md
SOLID principles for C# 12/.NET 9. Files < 100 lines, interfaces separated, modular architecture. Contracts MANDATORY.
$ install --global
skillsauthnpx skillsauth add fusengine/agents solid-csharpInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Apr 4, 2026, 11:45 PM50.6s3 files scanned
SKILL.md
- name:
- solid-csharp
- description:
- SOLID principles for C# 12/.NET 9. Files < 100 lines, interfaces separated, modular architecture. Contracts MANDATORY.
- csharp:
- 12
- dotnet:
- 9
- user-invocable:
- true
- references:
- references/principles.md, references/patterns.md
- related-skills:
- solid-detection
SOLID C# - Modular Architecture
Agent Workflow (MANDATORY)
Before ANY implementation, use TeamCreate to spawn 3 agents:
- fuse-ai-pilot:explore-codebase - Analyze existing architecture
- fuse-ai-pilot:research-expert - Verify .NET docs via Context7
- fuse-ai-pilot:sniper - Post-implementation validation
DRY - Reuse Before Creating (MANDATORY)
Before writing ANY new code:
- Grep the codebase for similar interfaces, services, or logic
- Check shared locations:
Core/Services/,Core/Contracts/ - If similar code exists -> extend/reuse instead of duplicate
- If code will be used by 2+ features -> create it in
Core/
Architecture (Modules MANDATORY)
| Layer | Location | Max Lines |
|-------|----------|-----------|
| Controllers | Modules/[Feature]/Controllers/ | 50 |
| Services | Modules/[Feature]/Services/ | 100 |
| Repositories | Modules/[Feature]/Repositories/ | 100 |
| Contracts | Modules/[Feature]/Contracts/ | 30 |
| Models | Modules/[Feature]/Models/ | 50 |
| Shared | Core/{Services,Contracts,Models}/ | - |
NEVER use flat structure - always Modules/[Feature]/
Critical Rules (MANDATORY)
| Rule | Value |
|------|-------|
| File limit | 100 lines (split at 90) |
| Controllers | < 50 lines, delegate to services |
| Interfaces | Contracts/ directory ONLY |
| XML docs | Every public member documented |
| DI | Use Microsoft.Extensions.DependencyInjection |
| Small interfaces | 1-3 members max |
| Records | Prefer record for DTOs and value objects |
Reference Guide
| Topic | Reference | When to consult | |-------|-----------|-----------------| | SOLID Principles | principles.md | Quick reference for all 5 principles | | Patterns & Structure | patterns.md | Directory layout, testing, records |
Forbidden
| Anti-Pattern | Fix |
|--------------|-----|
| Files > 100 lines | Split at 90 |
| Interfaces in impl files | Move to Contracts/ directory |
| Fat interfaces (4+ members) | Split into focused interfaces |
| Flat project structure | Use Modules/[Feature]/ |
| new for dependencies | Use constructor injection + DI |
| Service Locator pattern | Use constructor injection |
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