{
  "name": "get_customer_activity_summary",
  "description": "Return a de-identified financial activity summary for a customer, identified ONLY by an opaque token (e.g. CUST_000123). Never accepts or returns a name.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "customer_token": {
        "type": "string",
        "description": "Opaque customer token, e.g. CUST_000123. Pass verbatim."
      },
      "period_days": {
        "type": "integer",
        "description": "Look-back window in days.",
        "default": 90
      }
    },
    "required": ["customer_token"]
  }
}