---
id: dedfc33f-4503-42ae-a19b-11cf6d4a6468
type: decision
title: "Phase 3 Collections+Decks plan created"
tags: [mantimon-tcg, python, planning, backend]
importance: 0.6
confidence: 0.8
created: "2026-01-28T06:40:35.526655+00:00"
updated: "2026-01-28T06:40:35.526655+00:00"
---

Created comprehensive PHASE_3_COLLECTION_DECKS.json with 14 tasks (29 hrs): CollectionService, DeckService, DeckValidator, starter decks, REST APIs, and 80-90 tests. Key decisions: allow saving invalid decks (store errors), separate DeckValidator for testability, ownership validation flag for campaign vs freeplay modes.