How do I install the Solid Csharp skill?

Run npx skillmds@latest add fusengine/solid-csharp-3 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Which AI agents work with Solid Csharp?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Solid Csharp free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Solid Csharp?

fusengine (@fusengine) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Solid Csharp by fusengine — Agent Skill

Name: Solid Csharp
Rating: 4.666666666666667 (3 reviews)
Author: fusengine

File contents

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

---name: solid-csharp-3description: SOLID principles for C# 12/.NET 9. Files < 100 lines, interfaces separated, modular architecture. Contracts MANDATORY.---# SOLID C# - Modular Architecture## Agent Workflow (MANDATORY)Before ANY implementation, use `TeamCreate` to spawn 3 agents:1. **fuse-ai-pilot:explore-codebase** - Analyze existing architecture2. **fuse-ai-pilot:research-expert** - Verify .NET docs via Context73. **fuse-ai-pilot:sniper** - Post-implementation validation---## DRY - Reuse Before Creating (MANDATORY)**Before writing ANY new code:**1. **Grep the codebase** for similar interfaces, services, or logic2. Check shared locations: `Core/Services/`, `Core/Contracts/`3. If similar code exists -> extend/reuse instead of duplicate4. 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](references/principles.md) | Quick reference for all 5 principles || **Patterns & Structure** | [patterns.md](references/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 |

Frequently asked questions

Solid Csharp