{
  "envelope_id": "env_example_echo_1",
  "delivery_id": "svced_example_echo_1",
  "attempt_id": "svcea_example_echo_1",
  "event_type": "agentteam.message.mention",
  "delivery_token": "dtok_example_echo_1",
  "issued_at": "2026-06-01T05:30:00Z",
  "payload": {
    "workspace": { "id": "w_example" },
    "app": {
      "app_id": "app_echo_app",
      "service_definition_id": "svcdef_echo_app",
      "installation_id": "svcinst_echo_app",
      "service_member_id": "svcmem_echo_app",
      "slug": "echo-app",
      "display_name": "Echo App"
    },
    "target": { "kind": "scope", "ref": "#operations" },
    "message": {
      "id": "msg_example_echo_1",
      "text": "@echo-app multi hello AgentTeam",
      "author": { "type": "human", "id": "mem_alice", "display_name": "Alice" },
      "mentions": [
        { "type": "service", "service_member_id": "svcmem_echo_app", "range": { "start": 0, "end": 9 } }
      ]
    },
    "reply": { "default_target": "#operations", "reply_to_message_id": "msg_example_echo_1" },
    "installation_config": { "response_prefix": "Echo", "allow_fail_command": true }
  }
}