Your shipment tracking agent integrates with six different carrier MCP servers (FedEx, UPS, USPS, DHL, and two regional providers). Each carrier's server returns delivery timestamps in a different format: FedEx uses Unix epoch milliseconds (`1714521600000`), UPS returns ISO 8601 with timezone (`2024-04-30T16:00:00-07:00`), USPS returns locale-formatted strings (`Tue, Apr 30 2024, 4:00 PM EDT`), and the regional carriers use vendor-specific formats. Production reports indicate that approximately 14% of agent-generated customer notifications contain incorrect delivery date references—sometimes off by hours, sometimes by entire days. You do not control the third-party MCP servers and cannot modify their output formats.