AsyncAPI Design Skill Skill

AsyncAPI Design Skill

When to Use This Skill

Use this skill when:

Designing event-driven APIs - AsyncAPI 3.0 for message-based architectures
Configuring message brokers - Kafka, RabbitMQ, MQTT, WebSocket bindings
Implementing in C# - Event contracts, MassTransit, Confluent Kafka
Event versioning - Schema evolution and backward compatibility

MANDATORY: Documentation-First Approach

Before creating AsyncAPI specifications:

Invoke docs-management skill for event-driven patterns
Verify AsyncAPI 3.0 syntax via MCP servers (context7 for latest spec)
Base all guidance on AsyncAPI 3.0 specification

AsyncAPI vs OpenAPI

| Aspect | OpenAPI | AsyncAPI | |--------|---------|----------| | Communication | Request/Response | Event-Driven | | Protocol | HTTP/HTTPS | Kafka, RabbitMQ, MQTT, WebSocket | | Initiator | Client requests | Publisher emits | | Pattern | Synchronous | Asynchronous | | Use Case | REST APIs | Message queues, streaming, IoT |

AsyncAPI 3.0 Structure Overview

asyncapi: 3.0.0
info:
  title: API Title
  version: 1.0.0

servers:
  production:
    host: kafka.example.com:9092
    protocol: kafka

channels:
  orderCreated:
    address: orders.created
    messages:
      orderCreatedMessage:
        $ref: '#/components/messages/OrderCreated'

operations:
  publishOrderCreated:
    action: send
    channel:
      $ref: '#/channels/orderCreated'

components:
  messages: { }
  schemas: { }
  securitySchemes: { }

For complete template: See basic-template.md

Quick Reference

Supported Protocols

| Protocol | Use Case | Binding Version | |----------|----------|-----------------| | Kafka | High-throughput streaming | 0.5.0 | | AMQP (RabbitMQ) | Message queuing | 0.3.0 | | MQTT | IoT, lightweight messaging | 0.2.0 | | WebSocket | Real-time browser comms | - |

For protocol-specific patterns: See protocol-patterns.md

Channel Naming Convention

{domain}.{entity}.{action}.{version}
Example: orders.order.created.v1

Workflow

Identify events - What significant occurrences need to be communicated?
Define channels - What topics/queues will carry these events?
Design messages - What data does each event contain?
Choose protocol - Kafka, RabbitMQ, MQTT, etc.?
Add bindings - Protocol-specific configuration
Document security - Authentication and authorization
Version strategy - How will events evolve?
Generate code - Use AsyncAPI generator for clients/handlers

References

Load on-demand based on need:

| Reference | Load When | |-----------|-----------| | basic-template.md | Creating a new AsyncAPI spec from scratch | | protocol-patterns.md | Configuring Kafka, RabbitMQ, MQTT, WebSocket | | csharp-implementation.md | Implementing in .NET/C# with MassTransit or Confluent | | event-design-patterns.md | Event envelopes, versioning, best practices |

Related Skills (Cross-Plugin)

| Phase | Skill | Plugin | Purpose | | ----- | ----- | ------ | ------- | | DESIGN | asyncapi-design (this skill) | formal-specification | Architecture research, pattern selection | | AUTHORING | asyncapi-authoring | spec-driven-development | Concrete YAML file creation |

Workflow: Design (research event patterns) → Author (create YAML) → Implement (generate code)

MCP Research

For current AsyncAPI patterns and tools:

perplexity: "AsyncAPI 3.0 specification" "event-driven API design patterns"
context7: "asyncapi" (for official documentation)
ref: "AsyncAPI spec examples" "Kafka binding patterns"

Version History

v2.0.0 (2026-01-17): Refactored to progressive disclosure pattern
- Extracted 4 reference files (~650 lines)
- Hub reduced from 789 to ~130 lines
v1.0.0 (2025-12-26): Initial release

Last Updated: 2026-01-17

Agent Skills: AsyncAPI Design Skill

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Skill Files