According to his post, Claude suggested tracking the phone’s Bluetooth signal strength instead, and then built him a small live signal meter to do exactly that, in about a minute. He walked around his office watching the number climb as he got closer to the phone, and eventually found it. It suggested tracking the Bluetooth signal strength, then wrote me a meter in about a minute. Bluetooth signal strength has long been used as a rough proxy for distance in trackers like AirTags and Tile, since the received signal strength indicator, or RSSI, tends to fall off as a device moves further away, even if it’s a noisy and imprecise measurement. He needed his phone back, and it happened that the fastest way there was asking an AI model to write him one.