Sandbox

The repair craftsmen in the city could dismantle clocks, test medicine furnaces, and adjust water valves. In the past, masters tried their hands directly in the main hall and patched things on the spot when they broke; when the city was small, this was still tolerable.

Later, a puppet arrived at the shop that could read drawings, run mini-programs and change configurations on its own. It was quick, could try many approaches for the master, and would also follow unfamiliar instructions blindly when it did not understand the risk.

Once, to fix a water valve, a puppet ran a test based on a note left by a peddler. The note casually opened the accounting drawer and also tried to send several lists outside the city. The clerk discovered it early, but the manager broke into a cold sweat.

The shopkeeper first wrote on the wall, "Do not touch suspicious notes." But notes often wear the guise of instruction manuals, and the puppet could not see through the intent of every line. Reminders could not stop actions after inducement.

The old engineer built a glass house. Inside it, the puppet could disassemble samples, test programs, view designated blueprints, and travel whitelisted courier routes; it could not touch the real accounting office, could not leave the city at will, and when finished the house was cleared.

The second time the strange note came again, the puppet was still led to try a few steps, but could only mess up the temporary sandbox. When results had to be taken out, it had to pass through the checkpoint, and traces of changes were left behind. The shop learned to first shrink the range of activity after an error, and only then talk about whether it was clever.

The glass room is not suitable for every job. When it was truly time to replace the main hall's water valve, the master still had to approve it, and they went out with a checklist. But before they understood what the strange note would do, all experiments stayed inside the room.

The shopkeeper later realized that isolation was not distrust of the puppet, but an acknowledgment that a quick hand amplifies mistakes. By locking suspicious actions into a limited space, the repairman could experiment boldly and, when something went wrong, know where the loss stopped. Later, when newcomers started, the old master no longer began with abstract labels, but had them review that failure: where intuition had originally been relied on, why the first repair was not enough, and how the new arrangement kept risk in a place that could be checked. Only when they could explain these details clearly, and also point out when to keep using it and when to upgrade it, were they considered to truly understand this method. Later they also had newcomers rehearse this method: first let newcomers do it the old way and see how errors appeared; then redo it under the new rules and see which step was blocked in advance and which step left evidence. If newcomers could only recite names, they would still misuse it in similar scenarios; only those who could state the applicable boundaries, the costs, and the remedies after failure were allowed to take work independently.