The existing test varied the move name and the denomination together, so a name-only or denom-only key would have passed it too. Two assertions nail it: give_item(gold)+give_item(silver) kills a name-only key, and give_item(gold)+accept_item(gold) kills a denom-only key. The spec now records the per-reply ceiling as a decision rather than an accident, and flags the pre-existing non-currency duplicate-tag path as open. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QYa9u7Kdxv5gX4AnwWexy8