api-contract
Generate OpenAPI, AsyncAPI, or Protobuf contract from requirements. Use for contract-first API development.
What this skill does
# /api-contract Command
Generate contract-first API specifications from requirements or domain descriptions.
## Usage
```text
/api-contract "user registration with email verification"
/api-contract "order events for downstream systems" format=asyncapi
/api-contract "high-performance inventory service" format=protobuf
```
## Workflow
### Step 1: Analyze Requirements
Parse the API description to identify:
- Domain entities and resources
- Required operations (CRUD, queries, commands)
- Communication pattern (sync REST, async events, RPC)
- Key consumers and use cases
### Step 2: Select Contract Format
If format not specified, auto-detect based on description:
| Pattern | Recommended Format |
|---------|-------------------|
| "API", "REST", "endpoint" | OpenAPI 3.1 |
| "events", "messages", "streaming" | AsyncAPI 3.0 |
| "gRPC", "high-performance", "internal" | Protocol Buffers |
### Step 3: Invoke Appropriate Skill
Load the relevant skill:
- `openapi-design` for REST APIs
- `asyncapi-design` for event-driven APIs
- `protobuf-design` for gRPC services
### Step 4: Design Resource Model
Identify and structure:
- Core entities with properties
- Value objects and enumerations
- Relationships between entities
- Request/response wrappers
### Step 5: Generate Contract
Create the API specification including:
- Complete schema definitions
- All operations/methods
- Authentication configuration
- Error response schemas
- Examples for each operation
### Step 6: Output Result
Deliver:
1. Contract specification (YAML or .proto)
2. Summary of endpoints/channels/services
3. Implementation notes
4. Suggested test scenarios
## Format-Specific Output
### OpenAPI 3.1
```yaml
openapi: 3.1.0
info:
title: Service Name API
version: 1.0.0
paths:
/resources:
get: ...
post: ...
components:
schemas: ...
securitySchemes: ...
```
### AsyncAPI 3.0
```yaml
asyncapi: 3.0.0
info:
title: Service Events
version: 1.0.0
channels:
resourceCreated:
address: resources.created
messages: ...
components:
messages: ...
schemas: ...
```
### Protocol Buffers
```protobuf
syntax = "proto3";
package service.v1;
service ResourceService {
rpc CreateResource(...) returns (...);
rpc GetResource(...) returns (...);
}
message Resource {
string id = 1;
...
}
```
## Examples
### REST API for User Registration
```text
/api-contract "user registration API with email verification and password reset"
```
Output:
- OpenAPI 3.1 specification
- POST /users (registration)
- POST /users/verify-email
- POST /users/forgot-password
- POST /users/reset-password
- JWT authentication scheme
### Event-Driven Order System
```text
/api-contract "order lifecycle events for fulfillment and notifications" format=asyncapi
```
Output:
- AsyncAPI 3.0 specification
- Channels: orders.created, orders.submitted, orders.shipped
- CloudEvents envelope
- Kafka bindings
### gRPC Product Catalog
```text
/api-contract "product catalog service with search and inventory" format=protobuf
```
Output:
- Protocol Buffers definition
- ProductService with CRUD + Search
- Streaming for bulk operations
- Well-known types for timestamps
## Integration
The command integrates with:
- **requirements-elicitation**: Uses functional requirements
- **enterprise-architecture**: Aligns with bounded contexts
- **test-strategy**: Generates contract test scenarios
- **systems-design**: Follows API design patterns
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