{
  "description": "Consumer group workflow — create group, read with acknowledgment",
  "steps": [
    {
      "step": 1,
      "action": "Create consumer group",
      "command": "XGROUP CREATE mystream mygroup $ MKSTREAM",
      "explanation": "Create 'mygroup' on 'mystream'. $ means only new entries. MKSTREAM creates the stream if it doesn't exist.",
      "response": "OK"
    },
    {
      "step": 2,
      "action": "Read pending entries as a consumer",
      "command": "XREADGROUP GROUP mygroup consumer-1 COUNT 10 STREAMS mystream >",
      "explanation": "> means undelivered entries. Each entry goes into the Pending Entries List (PEL) until acknowledged.",
      "response": [
        {
          "stream": "mystream",
          "entries": [
            {
              "id": "1526919030474-55",
              "fields": {
                "event": "order_placed",
                "order_id": "ORD-001",
                "amount": "99.99"
              }
            }
          ]
        }
      ]
    },
    {
      "step": 3,
      "action": "Acknowledge processed entries",
      "command": "XACK mystream mygroup 1526919030474-55",
      "explanation": "Mark entry as processed. Removes it from the PEL.",
      "response": 1
    }
  ]
}