Build event-driven APIs with webhooks, Server-Sent Events, and real-time notifications. Use when building event-driven API architectures. Trigger with phrases like "add webhooks", "implement events", or "create event-driven API".
npxskills add jeremylongshore/claude-code-plugins-plus-skills--skill emitting-api-eventsLoading…
Build event-driven API architectures using outbound webhooks, Server-Sent Events (SSE), and message broker integration. Implement event emission from API mutations, event schema registry, subscriber management, delivery guarantees with retry logic, and event sourcing patterns for maintaining a complete audit log of API state changes.
resource.action convention (e.g., order.created, user.updated).eventId (UUID), eventType, version, (ISO 8601), (service identifier), and (type-specific payload).timestampsourcedataPOST /webhooks (subscribe), GET /webhooks (list), DELETE /webhooks/:id (unsubscribe), with URL validation, event type filtering, and signing secret generation.GET /events/stream) for real-time event delivery to browser clients, with Last-Event-ID support for reconnection and missed event replay.See ${CLAUDE_SKILL_DIR}/references/implementation.md for the full implementation guide.
${CLAUDE_SKILL_DIR}/src/events/emitter.js - Event emission service with outbox pattern${CLAUDE_SKILL_DIR}/src/events/schemas/ - Versioned event type schema definitions${CLAUDE_SKILL_DIR}/src/events/webhooks/ - Webhook delivery, signing, and retry logic${CLAUDE_SKILL_DIR}/src/events/sse.js - Server-Sent Events streaming endpoint${CLAUDE_SKILL_DIR}/src/routes/webhooks.js - Webhook subscription management API${CLAUDE_SKILL_DIR}/src/events/dead-letter.js - Dead-letter queue handler with replay${CLAUDE_SKILL_DIR}/tests/events/ - Event emission and delivery integration tests| Error | Cause | Solution |
|---|---|---|
| Event lost on crash | Application crashes between database commit and event publish | Use transactional outbox pattern: write event to outbox table in same transaction, poll and publish separately |
| Webhook delivery failure | Subscriber endpoint unreachable or returns non-2xx | Retry with exponential backoff; deactivate subscription after 5 consecutive failures; notify subscriber admin |
| Event ordering violation | Concurrent mutations publish events out of order | Use partition keys (resource ID) for ordered delivery within a partition; accept out-of-order across partitions |
| SSE connection memory leak | Server accumulates stale SSE connections without cleanup | Implement heartbeat comments (:keepalive\n\n) every 15 seconds; detect and close dead connections |
| Schema version mismatch | Consumer expects v1 event format but receives v2 | Include version field in event envelope; support simultaneous v1/v2 delivery; deprecate old versions with notice |
Refer to ${CLAUDE_SKILL_DIR}/references/errors.md for comprehensive error patterns.
Order lifecycle events: Emit order.created, order.payment_received, order.shipped, and order.delivered events with order details, enabling downstream services (warehouse, email, analytics) to react asynchronously.
SSE live notifications: Browser client connects to GET /events/stream?types=message.received,order.updated and receives real-time event updates with automatic reconnection and Last-Event-ID replay on network interruption.
Transactional outbox: Write the event record to an outbox table within the same database transaction as the API mutation, then poll the outbox table every 100ms to publish events to Kafka, ensuring at-least-once delivery.
See ${CLAUDE_SKILL_DIR}/references/examples.md for additional examples.
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Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Transcribe audio via OpenAI Audio Transcriptions API (Whisper).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.