Example 1 — the clean duplicate swap
You hold two of a plush your shelf marks as duplicate-pair; the other player collects that line and holds a plush missing from yours. Offerer checklist: both sides place their own items, nothing left to chat promises. Reviewer checklist: the incoming plush is new-to-collection, the outgoing one is your marked duplicate — rarity evidence looks even, and nobody is rushing. Both players step on ✅ with the final board matching the plan. That is a complete, documented-flow trade with no values needed.
Example 2 — the pressured thin offer
The other player places one plush and types "accept fast, I'm leaving". Reviewer checklist: your goal is new plushes, and the offer is one item for two of yours — thin. The documented counters exist for exactly this: jump on ➕ to request more, and if the answer is pressure instead of items, jump on ❌. A cancelled board costs nothing; the flow's exits are official. If they re-offer properly, the board restarts and every check runs again.