ddd-microservices

Provides comprehensive guidance for DDD in microservices including bounded contexts, service boundaries, event-driven architecture, and microservice patterns. Use when the user asks about DDD microservices, needs to design microservices with DDD, or implement microservice architectures.

261 stars

bypartme-ai

View on GitHub Installation ↓

Best use case

ddd-microservices is best used when you need a repeatable AI agent workflow instead of a one-off prompt. It is especially useful for teams working in multi. Provides comprehensive guidance for DDD in microservices including bounded contexts, service boundaries, event-driven architecture, and microservice patterns. Use when the user asks about DDD microservices, needs to design microservices with DDD, or implement microservice architectures.

Users should expect a more consistent workflow output, faster repeated execution, and less time spent rewriting prompts from scratch.

Practical example

Example input

Use the "ddd-microservices" skill to help with this workflow task. Context: Provides comprehensive guidance for DDD in microservices including bounded contexts, service boundaries, event-driven architecture, and microservice patterns. Use when the user asks about DDD microservices, needs to design microservices with DDD, or implement microservice architectures.

Example output

A structured workflow result with clearer steps, more consistent formatting, and an output that is easier to reuse in the next run.

When to use this skill

Use this skill when you want a reusable workflow rather than writing the same prompt again and again.

When not to use this skill

Do not use this when you only need a one-off answer and do not need a reusable workflow.
Do not use it if you cannot install or maintain the related files, repository context, or supporting tools.

Installation

Claude Code / Cursor / Codex

$curl -o ~/.claude/skills/ddd-microservices/SKILL.md --create-dirs "https://raw.githubusercontent.com/partme-ai/full-stack-skills/main/skills/ddd-skills/ddd-microservices/SKILL.md"

Manual Installation

Download SKILL.md from GitHub
Place it in .claude/skills/ddd-microservices/SKILL.md inside your project
Restart your AI agent — it will auto-discover the skill

How ddd-microservices Compares

Feature / Agent	ddd-microservices	Standard Approach
Platform Support	Not specified	Limited / Varies
Context Awareness	High	Baseline
Installation Complexity	Unknown	N/A

Frequently Asked Questions

What does this skill do?

Where can I find the source code?

You can find the source code on GitHub using the link provided at the top of the page.

SKILL.md Source

## When to use this skill

Use this skill whenever the user wants to:
- Use DDD to define microservice boundaries (bounded contexts, aggregates, domain events)
- Design inter-service contracts and event-driven communication
- Implement cross-service consistency, querying, and operational strategies
- Decide between synchronous (REST/gRPC) and asynchronous (events/messaging) communication

## How to use this skill

### Workflow

1. **Map bounded contexts** to identify natural service boundaries
2. **Define aggregates** within each service for data consistency
3. **Design communication**: synchronous for queries and strong consistency; asynchronous (domain events) for decoupling
4. **Ensure data ownership**: each service owns its database; share data via APIs or events

### 1. Bounded Context to Service Mapping

```
E-Commerce Domain:
├── Order Service        ← Order bounded context
│   ├── Order aggregate
│   └── OrderPlaced event
├── Inventory Service    ← Inventory bounded context
│   ├── Product aggregate
│   └── StockReserved event
├── Payment Service      ← Payment bounded context
│   ├── Payment aggregate
│   └── PaymentCompleted event
└── Notification Service ← Cross-cutting
    └── Subscribes to all domain events
```

### 2. Synchronous Communication (Feign/gRPC)

```java
@FeignClient(name = "inventory-service")
public interface InventoryClient {
    @GetMapping("/api/products/{id}/stock")
    StockInfo getStock(@PathVariable String id);
}
```

### 3. Asynchronous Communication (Domain Events)

```java
// Order Service publishes
@Transactional
public void placeOrder(PlaceOrderCommand cmd) {
    Order order = Order.create(cmd);
    orderRepository.save(order);
    eventPublisher.publish(new OrderPlacedEvent(order.getId(), order.getItems()));
}

// Inventory Service subscribes
@EventListener
public void onOrderPlaced(OrderPlacedEvent event) {
    inventoryService.reserveStock(event.getItems());
}
```

### 4. Database per Service

```
Order Service      → order_db (PostgreSQL)
Inventory Service  → inventory_db (PostgreSQL)
Payment Service    → payment_db (PostgreSQL)
```

## Best Practices

- Define bounded contexts clearly before splitting into services; avoid premature decomposition
- Use domain events to express cross-aggregate and cross-service facts; ensure idempotency and ordering
- Define clear SLAs, data ownership, and failure boundaries for each service
- Prefer eventual consistency with compensating transactions (Saga pattern) over distributed transactions

## Resources

- Building Microservices by Sam Newman
- Domain-Driven Design by Eric Evans
- https://microservices.io/

## Keywords

ddd microservices, bounded context, aggregate, domain events, service boundary, Saga pattern, CQRS, database per service, eventual consistency, API gateway

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