---
id: 56ced501-3617-454a-8a46-e0818a79e30c
type: solution
title: "Engine validation script with attack_coin_status"
tags: [mantimon-tcg, python, game-engine, testing]
importance: 0.6
confidence: 0.8
created: "2026-01-28T06:17:02.760776+00:00"
updated: "2026-01-28T06:17:02.760776+00:00"
---

Added comprehensive engine_validation.py script (~1250 lines) with 29 test cases validating game engine behavior. Created attack_coin_status effect handler for coin-flip status conditions like Thunder Shock paralysis. Key learnings: attacks must be in ATTACK phase for energy validation, WeaknessResistance needs explicit mode=ModifierMode.ADDITIVE for +20 damage (default is multiplicative). Uses seed=42 for deterministic results.