Asyncapi docs

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AsyncAPI specification handling for event-driven API documentation. Parse, validate, and generate documentation for message-based APIs including Kafka, MQTT, WebSocket, and AMQP systems.

SKILL.md

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AsyncAPI Documentation Skill

Generate and validate documentation for event-driven APIs using the AsyncAPI specification with support for multiple messaging protocols.

Capabilities

Parse and validate AsyncAPI 2.x and 3.x specifications
Generate documentation from AsyncAPI specs
Document event/message schemas
Channel and operation documentation
Protocol-specific binding documentation (Kafka, MQTT, WebSocket, AMQP)
Code generator integration
Spectral linting for AsyncAPI
Schema validation and type generation

Usage

Invoke this skill when you need to:

Document event-driven microservices
Create message broker API documentation
Generate client code from async specifications
Validate AsyncAPI specifications
Create interactive documentation sites

Inputs

Parameter	Type	Required	Description
specPath	string	Yes	Path to AsyncAPI specification
outputDir	string	No	Documentation output directory
generator	string	No	html, markdown, react (default: html)
validate	boolean	No	Run spec validation (default: true)
lint	boolean	No	Run Spectral linting (default: true)
generateCode	boolean	No	Generate client/server stubs
codeLanguage	string	No	Code generation target language

Input Example

{
  "specPath": "./asyncapi.yaml",
  "outputDir": "docs/async",
  "generator": "html",
  "validate": true,
  "lint": true,
  "generateCode": true,
  "codeLanguage": "typescript"
}

Output Structure

docs/async/
├── index.html              # Main documentation page
├── servers.html            # Server/broker documentation
├── channels/
│   ├── user-events.html    # Channel documentation
│   └── order-events.html
├── messages/
│   ├── UserCreated.html    # Message documentation
│   └── OrderPlaced.html
├── schemas/
│   ├── User.html           # Schema documentation
│   └── Order.html
├── bindings/               # Protocol bindings
│   └── kafka.html
├── search.json             # Search index
└── asyncapi.json           # Bundled spec

AsyncAPI Specification Patterns

Basic AsyncAPI 3.0 Document

asyncapi: 3.0.0
info:
  title: User Events API
  version: 1.0.0
  description: |
    Event-driven API for user management operations.

    ## Overview
    This API publishes events when user data changes.
    Consumers can subscribe to specific channels to receive
    real-time updates.

    ## Authentication
    All connections require a valid API key passed in the
    connection headers.
  contact:
    name: API Team
    email: [email protected]
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0

servers:
  production:
    host: kafka.example.com:9092
    protocol: kafka
    description: Production Kafka cluster
    security:
      - $ref: '#/components/securitySchemes/sasl'
    tags:
      - name: production
        description: Production environment

  staging:
    host: kafka-staging.example.com:9092
    protocol: kafka
    description: Staging environment

channels:
  userCreated:
    address: user.events.created
    messages:
      UserCreatedMessage:
        $ref: '#/components/messages/UserCreated'
    description: |
      Published when a new user account is created.

      **Trigger**: User registration completion
      **Frequency**: ~1000 events/day

  userUpdated:
    address: user.events.updated
    messages:
      UserUpdatedMessage:
        $ref: '#/components/messages/UserUpdated'

operations:
  publishUserCreated:
    action: send
    channel:
      $ref: '#/channels/userCreated'
    summary: Publish user created event
    description: |
      Publishes an event when a new user is created.
      Events are partitioned by user ID.
    tags:
      - name: users
    bindings:
      kafka:
        groupId: user-service
        clientId: user-publisher

  subscribeUserCreated:
    action: receive
    channel:
      $ref: '#/channels/userCreated'
    summary: Subscribe to user created events
    description: |
      Subscribe to receive notifications when new users
      are created. Ideal for:
      - Welcome email services
      - Analytics tracking
      - Audit logging

components:
  messages:
    UserCreated:
      name: UserCreated
      title: User Created Event
      summary: Event published when a user is created
      contentType: application/json
      traits:
        - $ref: '#/components/messageTraits/commonHeaders'
      payload:
        $ref: '#/components/schemas/UserCreatedPayload'
      examples:
        - name: NewUser
          summary: Standard user creation
          payload:
            userId: "usr_123456"
            email: "[email protected]"
            createdAt: "2026-01-24T10:30:00Z"
            source: "web-signup"

    UserUpdated:
      name: UserUpdated
      title: User Updated Event
      summary: Event published when user data changes
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UserUpdatedPayload'

  schemas:
    UserCreatedPayload:
      type: object
      description: Payload for user created events
      required:
        - userId
        - email
        - createdAt
      properties:
        userId:
          type: string
          description: Unique user identifier
          pattern: "^usr_[a-zA-Z0-9]+$"
          examples:
            - "usr_123456"
        email:
          type: string
          format: email
          description: User's email address
        createdAt:
          type: string
          format: date-time
          description: Timestamp of user creation
        source:
          type: string
          enum:
            - web-signup
            - mobile-app
            - admin-portal
            - api
          description: Registration source

    UserUpdatedPayload:
      type: object
      required:
        - userId
        - updatedAt
        - changes
      properties:
        userId:
          type: string
          description: Unique user identifier
        updatedAt:
          type: string
          format: date-time
        changes:
          type: array
          items:
            type: object
            properties:
              field:
                type: string
              oldValue:
                type: string
              newValue:
                type: string

  messageTraits:
    commonHeaders:
      headers:
        type: object
        properties:
          correlationId:
            type: string
            description: Correlation ID for distributed tracing
            format: uuid
          timestamp:
            type: string
            format: date-time
            description: Event timestamp
          version:
            type: string
            description: Schema version

  securitySchemes:
    sasl:
      type: scramSha256
      description: SASL/SCRAM-SHA-256 authentication

Kafka-Specific Bindings

channels:
  orderEvents:
    address: orders.events
    bindings:
      kafka:
        topic: orders.events.v1
        partitions: 12
        replicas: 3
        topicConfiguration:
          cleanup.policy:
            - delete
          retention.ms: 604800000  # 7 days
          segment.bytes: 1073741824
    messages:
      OrderCreated:
        bindings:
          kafka:
            key:
              type: string
              description: Order ID used as partition key
            schemaIdLocation: header
            schemaIdPayloadEncoding: confluent

WebSocket Channel

asyncapi: 3.0.0
info:
  title: Real-time Notifications API
  version: 1.0.0

servers:
  production:
    host: ws.example.com
    protocol: wss
    description: WebSocket server for real-time notifications

channels:
  notifications:
    address: /notifications/{userId}
    parameters:
      userId:
        description: The user ID to receive notifications for
    messages:
      Notification:
        $ref: '#/components/messages/Notification'
    bindings:
      ws:
        query:
          type: object
          properties:
            token:
              type: string
              description: Authentication token
          required:
            - token

MQTT Channel

asyncapi: 3.0.0
info:
  title: IoT Sensor API
  version: 1.0.0

servers:
  production:
    host: mqtt.example.com:8883
    protocol: mqtts
    description: MQTT broker for IoT devices

channels:
  sensorReadings:
    address: sensors/{sensorId}/readings
    parameters:
      sensorId:
        description: Unique sensor identifier
    messages:
      SensorReading:
        $ref: '#/components/messages/SensorReading'
    bindings:
      mqtt:
        qos: 1
        retain: false
        bindingVersion: '0.2.0'

AsyncAPI CLI Commands

Validation

# Validate specification
asyncapi validate asyncapi.yaml

# Validate with custom rules
asyncapi validate asyncapi.yaml --rule-file .spectral.yaml

Documentation Generation

# Generate HTML documentation
asyncapi generate fromTemplate asyncapi.yaml @asyncapi/html-template -o docs

# Generate Markdown
asyncapi generate fromTemplate asyncapi.yaml @asyncapi/markdown-template -o docs

# Generate React app
asyncapi generate fromTemplate asyncapi.yaml @asyncapi/react-component -o docs

Code Generation

# TypeScript types
asyncapi generate models asyncapi.yaml typescript -o src/types

# Java models
asyncapi generate models asyncapi.yaml java -o src/main/java

# Python models
asyncapi generate models asyncapi.yaml python -o src/models

Spectral Linting Rules

.spectral.yaml

extends:
  - "@asyncapi/spectral-ruleset"

rules:
  # Require descriptions
  asyncapi-info-description: error
  asyncapi-channel-description: warn
  asyncapi-operation-description: warn

  # Require examples
  asyncapi-message-examples: warn

  # Schema validation
  asyncapi-payload-unsupported-schemaFormat: error
  asyncapi-schema: error

  # Custom rules
  operation-summary-required:
    description: Operations must have summaries
    given: "$.operations[*]"
    then:
      field: summary
      function: truthy
    severity: warn

  message-content-type:
    description: Messages must specify content type
    given: "$.components.messages[*]"
    then:
      field: contentType
      function: truthy
    severity: error

Documentation Best Practices

Channel Documentation

channels:
  paymentCompleted:
    address: payments.completed.v1
    description: |
      ## Payment Completed Events

      Published when a payment is successfully processed.

      ### Use Cases
      - Order fulfillment initiation
      - Customer notification
      - Financial reconciliation

      ### Consumer Guidelines
      - Process events idempotently (use `paymentId` for deduplication)
      - Acknowledge within 30 seconds
      - Implement dead letter queue handling

      ### SLA
      - **Latency**: Events published within 1s of payment completion
      - **Ordering**: Events are ordered by `paymentId` within partition
      - **Retention**: 7 days

Schema Documentation

components:
  schemas:
    Payment:
      type: object
      title: Payment
      description: |
        Represents a completed payment transaction.

        ## Versioning
        This schema follows semantic versioning. Breaking changes
        will result in a new major version.

        ## Privacy
        Contains PII - handle according to data protection policies.
      required:
        - paymentId
        - amount
        - currency
      properties:
        paymentId:
          type: string
          format: uuid
          description: Unique payment identifier
          x-field-extra-annotation: "@Id"
        amount:
          type: number
          format: decimal
          description: Payment amount in minor units (cents)
          minimum: 0
          examples:
            - 1999
            - 50000
        currency:
          type: string
          pattern: "^[A-Z]{3}$"
          description: ISO 4217 currency code
          examples:
            - USD
            - EUR
            - GBP

Workflow

Parse specification - Load and validate AsyncAPI document
Lint specification - Run Spectral rules
Validate schemas - Check JSON Schema validity
Generate documentation - Create HTML/Markdown output
Generate code - Create typed models (optional)
Bundle specification - Create bundled output file

Dependencies

{
  "devDependencies": {
    "@asyncapi/cli": "^1.0.0",
    "@asyncapi/html-template": "^2.0.0",
    "@asyncapi/markdown-template": "^1.0.0",
    "@asyncapi/generator": "^1.0.0",
    "@asyncapi/modelina": "^3.0.0",
    "@stoplight/spectral-cli": "^6.0.0",
    "@asyncapi/spectral-ruleset": "^1.0.0"
  }
}

Best Practices Applied

Use semantic versioning in spec info
Document all channels with descriptions
Include message examples
Specify content types for messages
Use traits for common patterns
Document protocol-specific bindings
Include consumer guidelines
Define SLAs in documentation

References

AsyncAPI Specification: https://www.asyncapi.com/docs/reference/specification/v3.0.0
AsyncAPI CLI: https://www.asyncapi.com/tools/cli
AsyncAPI Generator: https://www.asyncapi.com/tools/generator
AsyncAPI Modelina: https://www.asyncapi.com/tools/modelina
Spectral: https://stoplight.io/open-source/spectral

Target Processes

api-doc-generation.js
api-reference-docs.js
data-model-docs.js
docs-as-code-pipeline.js