A customer comes back **4 hours** after the original session about the same billing dispute. The prior **32-turn** session includes `lookup_order` results stating: “Status: PENDING, Expected resolution: 24-48 hours.” During testing, you find that, when sessions with stale tool results are resumed, the agent frequently cites the outdated information in its responses (for example, “I see your refund is still being processed”) even after later fresh tool calls return different details. What approach most reliably supports returning customers?