Phase 5 / Ep 26: Hands-on Plugin —— \"Notion Synchronizer\"

⏱ Est. reading time: 3 min Updated on 4/13/2026

🎯 Learning Objective: Develop a Plugin with practical business value.

1. Functional Requirements

Every time the Agent completes a session, automatically write the conversation summary to a Notion database:

  • 📅 Date
  • 🏷️ Topic Tags
  • 📝 Conversation Summary
  • 🔗 Session ID

2. Architecture Design

sequenceDiagram
    participant Agent as 🤖 Agent
    participant Plugin as 🔌 Notion Sync
    participant Queue as 📋 Queue
    participant Notion as 📓 Notion API

    Agent->>Plugin: afterAgent hook triggered
    Plugin->>Plugin: Extract conversation summary
    Plugin->>Queue: Add to sync queue
    Queue->>Notion: Batch write (every 5 minutes)
    Notion->>Queue: ✅ Write successful

3. Key Design Decisions

Decision Choice Reason
Sync Timing afterAgent Ensure the Agent has finished processing
Sync Strategy Batch (5 minutes) Avoid frequent API calls
Error Handling Exponential backoff retry Notion API occasionally rate limits
Summary Generation Take the first 100 characters of the Agent's final reply Simple and effective

4. Configuration

// manifest.json
{
  "name": "notion-sync",
  "hooks": ["afterAgent"],
  "config": {
    "NOTION_TOKEN": "${NOTION_TOKEN}",
    "DATABASE_ID": "your-database-id",
    "SYNC_INTERVAL_MS": 300000
  }
}

5. Error Handling

  • Notion API 429: Exponential backoff, retry up to 3 times
  • Network timeout: Add to retry queue
  • Token expiration: Log alert + Telegram notification

Next Episode Preview: Ep 27, Plugin publishing, hot updates, and lifecycle management.