An LLM is tasked with determining the capacity of a water tank. After an initial step, it has calculated the tank's volume to be 50 cubic meters. For its next step, it needs to convert this volume to liters by calling an external calculator, knowing that 1 cubic meter equals 1000 liters. Which of the following strings correctly formats this specific calculation for the tool?

An AI assistant has calculated a container's volume to be 12.5 cubic meters. To perform the next step of converting this volume to liters (knowing 1 cubic meter = 1000 liters) using an external computational tool, the assistant must generate a specific command string. Complete the expression part of the command string below:

12.5 × 1000 = {tool: calculator, expression: ____}

LLM Tool Invocation for Unit Conversion