fix(mcp): use local sqlite scene storage

packages/mcp/src/tools/create-wall.ts

@@ -41,8 +41,8 @@ export function registerCreateWall(server: McpServer, bridge: SceneBridge): void
       }
 
       const wall = WallNode.parse({
-        start,
-        end,
+        start: start as [number, number],
+        end: end as [number, number],
         ...(thickness !== undefined ? { thickness } : {}),
         ...(height !== undefined ? { height } : {}),
       })

packages/mcp/src/tools/place-item.ts

@@ -84,7 +84,7 @@ export function registerPlaceItem(server: McpServer, bridge: SceneBridge): void
           : {}
 
       const item = ItemNode.parse({
-        position,
+        position: position as [number, number, number],
         rotation: [0, rotation ?? 0, 0],
         asset: baseAsset,
         ...wallExtras,

packages/mcp/src/tools/scene-lifecycle/test-utils.ts

@@ -21,7 +21,7 @@ export function parseToolText(content: StoredTextContent[]): Record<string, unkn
  * `expectedVersion`.
  */
 export class InMemorySceneStore implements SceneStore {
-  readonly backend = 'filesystem' as const
+  readonly backend = 'sqlite' as const
   private readonly data = new Map<string, SceneWithGraph>()
   private idCounter = 0
 

packages/mcp/src/tools/schemas.ts

@@ -8,11 +8,15 @@ import { z } from 'zod'
 /** A node identifier — non-empty string. The core uses `${prefix}_${nanoid}`. */
 export const NodeIdSchema = z.string().min(1)
 
-/** 2D point as [x, z] (floor plane). Matches core's tuple convention. */
-export const Vec2Schema = z.tuple([z.number(), z.number()])
+/**
+ * 2D point as [x, z] (floor plane). Use array length constraints instead of
+ * `z.tuple()` so MCP hosts that only accept JSON Schema's common `items` shape
+ * can register the tools.
+ */
+export const Vec2Schema = z.array(z.number()).min(2).max(2)
 
 /** 3D point as [x, y, z]. */
-export const Vec3Schema = z.tuple([z.number(), z.number(), z.number()])
+export const Vec3Schema = z.array(z.number()).min(3).max(3)
 
 /**
  * A single patch operation. Union of create / update / delete.

packages/mcp/src/tools/set-zone.ts

@@ -41,7 +41,7 @@ export function registerSetZone(server: McpServer, bridge: SceneBridge): void {
 
       const zone = ZoneNode.parse({
         name: label,
-        polygon,
+        polygon: polygon as Array<[number, number]>,
         metadata: properties ?? {},
       })
       const id = bridge.createNode(zone, levelId as AnyNodeId)