# E3.M3 — Prototype story backlog (ItemizationAndInventorySchema) Working backlog for **Epic 3 — Slice 1** ([items and inventory MVP](../decomposition/epics/epic_03_crafting_economy.md#slice-1---items-and-inventory-mvp)). Decomposition and contracts: [E3.M3 — ItemizationAndInventorySchema](../decomposition/modules/E3_M3_ItemizationAndInventorySchema.md). **Labels (Linear):** every issue **`E3.M3`**; add **`server`** / **`Feature`** or **`Story`** as listed per issue. **Precursor (do not re-scope):** gather **skill XP** on `resource_node` interact is **E3.M1** anchor only ([NEO-41](https://linear.app/neon-sprawl/issue/NEO-41)) — no `GatherResult` / inventory yet. This module owns **`ItemDef`**, **`ItemInstance`**, **`InventorySlot`**, and server-authoritative player inventory. **Prototype item spine (frozen in E3M3-01):** six rows covering **material → intermediate → consumable → utility → quest token → equip stub** for the gather→refine→craft loop ([items.md](../game-design/items.md), [gathering.md](../game-design/gathering.md), [crafting.md](../game-design/crafting.md)). **Linear issues (created):** attach `docs/plans/NEO-*-implementation-plan.md` on the same branch as implementation work. | Slug | Linear | |------|--------| | E3M3-01 | [NEO-50](https://linear.app/neon-sprawl/issue/NEO-50) | | E3M3-02 | [NEO-51](https://linear.app/neon-sprawl/issue/NEO-51) | | E3M3-03 | [NEO-52](https://linear.app/neon-sprawl/issue/NEO-52) | | E3M3-04 | [NEO-53](https://linear.app/neon-sprawl/issue/NEO-53) | | E3M3-05 | [NEO-54](https://linear.app/neon-sprawl/issue/NEO-54) | | E3M3-06 | [NEO-55](https://linear.app/neon-sprawl/issue/NEO-55) | | E3M3-07 | [NEO-56](https://linear.app/neon-sprawl/issue/NEO-56) | **Dependency graph in Linear:** E3M3-02 blocked by E3M3-01. E3M3-03 blocked by E3M3-02. E3M3-04 and E3M3-05 blocked by E3M3-03. E3M3-06 blocked by E3M3-05. E3M3-07 blocked by E3M3-05 (may parallel E3M3-06). --- ## Story order (recommended) | Order | Slug | Depends on | |-------|------|------------| | 1 | **E3M3-01** | None (content spine) | | 2 | **E3M3-02** | E3M3-01 | | 3 | **E3M3-03** | E3M3-02 | | 4 | **E3M3-04** | E3M3-03 | | 5 | **E3M3-05** | E3M3-03 | | 6 | **E3M3-06** | E3M3-05 | | 7 | **E3M3-07** | E3M3-05 | **Downstream (separate modules):** [E3.M1](../decomposition/modules/E3_M1_ResourceNodeAndGatherLoop.md) Slice 2 gather yields → inventory grants; [E3.M2](../decomposition/modules/E3_M2_RefinementAndRecipeExecution.md) craft I/O; [NEO-42](https://linear.app/neon-sprawl/issue/NEO-42) refine XP hook invokes after craft success. --- ### E3M3-01 — Prototype ItemDef starter set + schemas + CI **Goal:** Lock content shape and CI validation for a **frozen six-item** prototype catalog before any server load. **In scope** - `content/schemas/item-def.schema.json` (or equivalent single-catalog schema). - `content/items/prototype_items.json` with stable ids: `scrap_metal_bulk`, `refined_plate_stock`, `field_stim_mk0`, `survey_drone_kit`, `contract_handoff_token`, `prototype_armor_shell` (names/display may change; **ids frozen**). - `scripts/validate_content.py`: schema validation, duplicate `id`, required `prototypeRole` coverage (one row per archetype), exact six-id allowlist for prototype. - Designer note in [E3_M3](../decomposition/modules/E3_M3_ItemizationAndInventorySchema.md) + `content/README.md`: stack rules, slot kinds (bag vs equip stub), v1 scope (no durability mutation). **Out of scope** - Server loader, inventory store, HTTP, client HUD. **Acceptance criteria** - [x] PR gate validates item JSON against schema. - [x] Exactly six prototype item ids; duplicate `id` fails CI. - [x] Stable id list documented in module doc freeze box. **Landed ([NEO-50](https://linear.app/neon-sprawl/issue/NEO-50)):** [`content/items/prototype_items.json`](../../content/items/prototype_items.json), [`item-def.schema.json`](../../content/schemas/item-def.schema.json), CI gates in [`validate_content.py`](../../scripts/validate_content.py); plan [NEO-50-implementation-plan.md](NEO-50-implementation-plan.md). --- ### E3M3-02 — Server item catalog load (fail-fast) **Goal:** Disk → host: startup load of `content/items/*.json` with CI-parity validation. **In scope** - Loader + registry interface under `server/NeonSprawl.Server/Game/Items/` (path TBD in plan). - Fail-fast on malformed files, duplicate ids, unknown enum values. - Unit tests (AAA) for loader happy path and failure modes. **Out of scope** - Per-player inventory, HTTP. **Acceptance criteria** - [ ] Server refuses boot when item catalog invalid (mirror E2.M1 catalog behavior). - [ ] Registry resolves `ItemDef` by `id`. --- ### E3M3-03 — Item definition registry + DI **Goal:** Injectable `IItemDefinitionRegistry` consumed by inventory and future craft/gather paths. **In scope** - `ItemDefinitionRegistry` implementation + DI registration. - Unit tests (AAA): lookup, unknown id, prototype row metadata. **Out of scope** - HTTP, persistence, stack mutation. **Acceptance criteria** - [ ] Host resolves registry from DI; unknown `itemId` distinguishable from valid ids in tests. --- ### E3M3-04 — GET world item-definitions **Goal:** Versioned read-only catalog for client preview, Bruno, and future codegen — mirror [NEO-36](https://linear.app/neon-sprawl/issue/NEO-36) skill-definitions pattern. **In scope** - `GET /game/world/item-definitions` + DTOs + API tests (AAA). - Bruno folder `bruno/neon-sprawl-server/item-definitions/`. - `server/README.md` section. **Out of scope** - Per-player inventory mutation. **Acceptance criteria** - [ ] GET returns all six prototype defs with schema version field. - [ ] Bruno happy path documented. --- ### E3M3-05 — Player inventory store + stack/slot rules engine **Goal:** Server-authoritative `ItemInstance` bags with stack limits and structured deny reasons; persistence (in-memory + Postgres + migration). **In scope** - `IPlayerInventoryStore`, migration `V00X__player_inventory` (number in plan). - Inventory operations: add stack, remove stack, slot capacity, `inventory_full` / `invalid_item` / `insufficient_quantity` reason codes. - Unit + integration tests (AAA); mirror NEO-8/NEO-38 persistence policy. **Out of scope** - HTTP, Bruno, client HUD. - Craft/gather automatic grants (callers in E3.M1 / E3.M2). **Acceptance criteria** - [ ] Add/remove respects `ItemDef` stack max from catalog. - [ ] Full bag returns stable `reasonCode` without partial silent loss. - [ ] Postgres + in-memory parity tests. --- ### E3M3-06 — Player inventory HTTP + Bruno **Goal:** Versioned **GET** snapshot and **POST** grant/consume (or add/remove) for manual QA and future client. **In scope** - `GET /game/players/{id}/inventory` and mutating POST (exact path/shape in implementation plan). - Known-player gate via `IPositionStateStore` (NEO-37 pattern). - Bruno `bruno/neon-sprawl-server/inventory/`. - `server/README.md`; API tests (AAA). **Out of scope** - Godot HUD (optional follow-up). - Gather node depletion ([E3.M1](../decomposition/modules/E3_M1_ResourceNodeAndGatherLoop.md)). **Acceptance criteria** - [ ] GET returns instances + slots for seeded player. - [ ] POST add/remove matches engine rules from E3M3-05. - [ ] Bruno exercises happy path + at least one deny (`inventory_full` or unknown item). --- ### E3M3-07 — `item_created` / transfer-failure telemetry hook sites **Goal:** Comment-only hooks on inventory mutation success/deny for future E9.M1 catalog events **`item_created`** and transfer failures. **In scope** - Hook placement in inventory engine (and POST path if applicable). - `TODO(E9.M1)` comments; no production logging. - README + module doc pointer. **Out of scope** - Telemetry ingest, dashboards. **Acceptance criteria** - [ ] Hook sites documented in code and `server/README.md`. - [ ] Matches Epic 3 Slice 1 telemetry vocabulary in [epic_03](../decomposition/epics/epic_03_crafting_economy.md). --- ## After this backlog - Decompose **[E3.M1](../decomposition/modules/E3_M1_ResourceNodeAndGatherLoop.md)** Slice 2 (gather yields → inventory) once E3M3-05+ land. - Track delivery in Linear; keep `blockedBy` links synchronized if scope changes. - For each issue kickoff, add `docs/plans/{NEO-XX}-implementation-plan.md` per [story-kickoff](../../.cursor/rules/story-kickoff.md). - Add `docs/manual-qa/{NEO-XX}.md` when HTTP surfaces land (E3M3-06+). ## Related docs - [E3_M3_ItemizationAndInventorySchema.md](../decomposition/modules/E3_M3_ItemizationAndInventorySchema.md) - [epic_03_crafting_economy.md](../decomposition/epics/epic_03_crafting_economy.md) - [items.md](../game-design/items.md) - [E2_M1_SkillDefinitionRegistry.md](../decomposition/modules/E2_M1_SkillDefinitionRegistry.md) (catalog pattern precedent)