Default continuation message in Inspect and Petri could be problematic

Inspect AI is one of the most popular libraries for running evaluations and is used downstream by libraries such as Petri and Control Arena. It provides ReAct Agent and Deep Agent out of the box. In both agents, the model is provided with tools in a loop, and by default the loop only ends when the agent calls the submit tool. When the model makes no tool call in a turn, the following message is sent to it by default (doc, code): Please proceed to the next step using your best judgement. If you b