curl --request GET \
  --url https://{appId}.api-{region}.cometchat.io/v3/ai-agents/agent-builder/agents/variables/all \
  --header 'apikey: <api-key>'

[
  {
    "name": "auth.uid",
    "description": "Authenticated user UID",
    "sourceType": "auth",
    "category": "auth",
    "usageCount": 2,
    "usedByAgents": [
      {
        "uid": "agent-1",
        "name": "Support Agent"
      }
    ],
    "usedByTools": {}
  }
]