Cqrs Implementation
Implement Command Query Responsibility Segregation for scalable architectures. Use when separating read and write models, optimizing query performance, or building event-sourced systems.
Specification
- Skill ID
- wshobson/agents/cqrs-implementation
- Publisher
- wshobson
- Repository
- agents
- Installs
- 0
- Files
- 2
- Synced
- Sep 23, 2026
How to use it
Open any RiverX project, open the Skills panel in the chat, and search for this identifier. The files are fetched from the source repository at install time.
wshobson/agents/cqrs-implementationInstalls these files- SKILL.md
- references/details.md
What this skill tells the agent
CQRS Implementation
Comprehensive guide to implementing CQRS (Command Query Responsibility Segregation) patterns.
When to Use This Skill
- Separating read and write concerns
- Scaling reads independently from writes
- Building event-sourced systems
- Optimizing complex query scenarios
- Different read/write data models needed
- High-performance reporting requirements
Core Concepts
1. CQRS Architecture
┌─────────────┐
│ Client │
└──────┬──────┘
│
┌────────────┴────────────┐
│ │
▼ ▼
┌─────────────┐ ┌─────────────┐
│ Commands │ │ Queries │
│ API │ │ API │
└──────┬──────┘ └──────┬──────┘
│ │
▼ ▼
┌─────────────┐ ┌─────────────┐
│ Command │ │ Query │
│ Handlers │ │ Handlers │
└──────┬──────┘ └──────┬──────┘
│ │
▼ ▼
┌─────────────┐ ┌─────────────┐
│ Write │─────────►│ Read │
│ Model │ Events │ Model │
└─────────────┘ └─────────────┘2. Key Components
| Component | Responsibility |
|---|---|
| Command | Intent to change state |
| Command Handler | Validates and executes commands |
| Event | Record of state change |
| Query | Request for data |
| Query Handler | Retrieves data from read model |
| Projector | Updates read model from events |
Templates and detailed worked examples
Full template library and detailed worked examples live in references/details.md. Read that file when you need the concrete templates.
Best Practices
Do's
- Separate command and query models - Different needs
- Use eventual consistency - Accept propagation delay
- Validate in command handlers - Before state change
- Denormalize read models - Optimize for queries
- Version your events - For schema evolution
Don'ts
- Don't query in commands - Use only for writes
- Don't couple read/write schemas - Independent evolution
- Don't over-engineer - Start simple
- Don't ignore consistency SLAs - Define acceptable lag
More from wshobson
Use this skill in a project
Open any RiverX project, search the Skills panel for wshobson/agents/cqrs-implementation, and install it in one click.