Skill

solid-csharp

SOLID principles for C# 12/.NET 9. Files < 100 lines, interfaces separated, modular architecture. Contracts MANDATORY.

Install

Run in your terminal

npx claudepluginhub fusengine/agents --plugin fuse-solid

Tool Access

This skill uses the workspace's default tool permissions.

Supporting Assets

View in Repository

references/patterns.md

references/principles.md

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Parent Repo Stars4

Parent Repo Forks0

Last CommitMar 26, 2026

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Architecture (Modules MANDATORY)

Layer

Location

Max Lines

Controllers

Modules/[Feature]/Controllers/

Services

Modules/[Feature]/Services/

100

Repositories

Modules/[Feature]/Repositories/

100

Contracts

Modules/[Feature]/Contracts/

Models

Modules/[Feature]/Models/

Shared

Core/{Services,Contracts,Models}/

NEVER use flat structure - always Modules/[Feature]/

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

Use Microsoft.Extensions.DependencyInjection

Small interfaces

1-3 members max

Records

Prefer record for DTOs and value objects

Topic

Reference

When to consult

SOLID Principles

principles.md

Quick reference for all 5 principles

Patterns & Structure

patterns.md

Directory layout, testing, records

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

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