> The CPU is used completely internally, and not invoked through any external tool calls. In order to make the model use this reliably, I decided to go the cheap way: by piggybacking on the tool call format that models are quite well-trained on, Qwen sends the CPU its instructions and reads back the results. No external tool calls or runtime are used

I'm confused, is it doing tool calls or not? Is this just saying that it writes a tool call but the NN then writes the response inline rather than the call being processed by the harness?