diff --git a/config/runtime-baseline.json b/config/runtime-baseline.json
index 7aa5479..b8032ff 100644
--- a/config/runtime-baseline.json
+++ b/config/runtime-baseline.json
@@ -2,7 +2,7 @@
   "baselineId": "bitbybit-web-cad-runtime-0.1",
   "entrypoint": "BitBybitWebCadFacade",
   "frontendFramework": "React 18 + Vite 6 + TypeScript 5",
-  "geometry": { "provider": "@bitbybit-dev/occt-worker", "kernel": "OCCT WASM", "version": "1.1.1", "execution": "dedicated worker", "wasmSha256": "1b6a8fc7b83d222854f73b66af8d0e45ad4fdee025904b447e885d4e18ae8656", "status": "primitive-and-placement-integration" },
+  "geometry": { "provider": "@bitbybit-dev/occt-worker", "kernel": "OCCT WASM", "version": "1.1.1", "execution": "dedicated worker", "wasmSha256": "1b6a8fc7b83d222854f73b66af8d0e45ad4fdee025904b447e885d4e18ae8656", "status": "primitive-placement-and-boolean-integration" },
   "viewport": { "provider": "Three.js internal adapter", "package": "three", "version": "0.185.1", "baseline": "WebGL2", "status": "adapter-skeleton" },
   "persistence": { "database": "@sqlite.org/sqlite-wasm 3.53.0-build1", "filesystem": "OPFS VFS with in-memory fallback", "writer": "single worker", "crossOriginIsolation": "required for OPFS worker", "status": "worker-skeleton" },
   "targetBrowsers": "Capability matrix to be locked in P0-02",
diff --git a/docs/web-cad-implementation-plan.zh-CN.md b/docs/web-cad-implementation-plan.zh-CN.md
index 885beba..3879e03 100644
--- a/docs/web-cad-implementation-plan.zh-CN.md
+++ b/docs/web-cad-implementation-plan.zh-CN.md
@@ -1595,7 +1595,7 @@ P0 基线/治理
 | P2-04 自动保存调度 | `IN PROGRESS` | `ProjectAutosaveScheduler` 在 Facade 文档事务后按空闲窗口合并最新版本，显式 Save 仍立即写入；恢复报告、崩溃点检测和用户可配置策略仍待补齐 |
 | P5-01 Three.js 视口适配器 | `IN PROGRESS` | `src/facade/threeViewport.ts` 使用 `three@0.185.1`，已挂载 WebGL2 场景和资源释放 |
 | P3-01 Bitbybit OCCT WASM 运行时 | `IN PROGRESS` | 精确锁定 `@bitbybit-dev/occt-worker@1.1.1`，专用 Worker 可加载 34,524,750 字节 OCCT WASM；尚未建立 FreeCAD/OCCT 自构建脚本，不能标记完成 |
-| P3-02 几何句柄与网格协议 | `IN PROGRESS` | Facade 已定义并实现受控 `ShapeHandle`、`MeshAsset`、`SubshapeRef` 类型；底层 OCCT hash 不出运行时，句柄篡改/释放后访问被拒绝；稳定子形状命名尚未实现 |
+| P3-02 几何句柄与网格协议 | `IN PROGRESS` | Facade 已定义并实现受控 `ShapeHandle`、`MeshAsset`、`SubshapeRef` 类型；句柄携带 documentId/version，底层 OCCT hash 不出运行时，跨文档、字段篡改和释放后访问被拒绝；稳定子形状命名尚未实现 |
 | P3-03 基本体和变换 | `IN PROGRESS` | 真实 OCCT Box/Cylinder/Sphere/Cone 和 FreeCAD 风格 Placement 已通过浏览器矩阵；0.05 mm 网格精度下曲面包围盒最大离散误差约 0.023 mm；自动化浏览器黄金测试尚未进入 CI |
 | P5-02 网格增量接入 | `IN PROGRESS` | Three Adapter 可用 `BufferGeometry` 接收 Facade `MeshAsset`，替换时释放旧 GPU geometry；对象缓存与文档增量同步尚未实现 |
 | P8-01 第一批自动化场景 | `IN PROGRESS` | `tests/facade.test.ts` 已覆盖初始化、schema、串行持久化队列、自动保存合并、资源引用、事件、任务生命周期、禁用命令、请求上下文、特征提交和历史；E2E/黄金几何待补齐 |
@@ -1648,3 +1648,19 @@ P0 基线/治理
 | 相同 Box 双句柄 | `PASS` | 释放第一个句柄后第二个仍可网格化；最终引用释放才删除 OCCT 缓存形状 |
 
 浏览器验证使用 `crossOriginIsolated=true` 的 Chrome、专用 OCCT Worker 和 `precision=0.05`。上述曲面误差均小于网格精度；这是三角网格显示误差，不代表 B-Rep 几何尺寸误差。
+
+### 16.13 P3-04 Boolean 子阶段验证记录
+
+Facade 已提供 `union`、`cut`、`intersection` 三个文档作用域 API。每个操作至少需要规定数量的输入，所有 ShapeHandle 必须属于结果 `documentId`，且输入版本不能高于结果版本；运算返回新句柄，源句柄保持有效。
+
+Bitbybit OCCT Worker 1.1.1 的内置 Intersection 包装在调用 `BRepAlgoAPI_Common.Build()` 之前检查 `HasGenerated()`，可对正常相交实体返回空 Compound。项目没有静默接受空结果，而是在自有 Worker 插件中直接按正确顺序执行 `Build()`、检查 `IsDone()/HasErrors()`、取得 `Shape()` 并统一同域面。调用仍通过 Bitbybit `OCCTWorkerManager`，React 和页面无法访问 Worker 或 OCCT。
+
+| 算例 | 结果 | 包围盒 |
+|---|---|---|
+| 两个 4 mm Box，第二个沿 X 偏移 2 mm，Union | 12 三角形 | X `[-2,4]`、Y/Z `[-2,2]` |
+| 同一输入，Cut `A-B` | 12 三角形 | X `[-2,0]`、Y/Z `[-2,2]` |
+| 同一输入，Intersection | 12 三角形 | X `[0,2]`、Y/Z `[-2,2]` |
+| 释放三个结果后访问两个源 Box | `PASS` | 源包围盒分别保持 `[-2,2]` 和 X `[0,4]` |
+| 跨文档/未来版本/输入不足 | `PASS` | Facade 同步拒绝，不触发 OCCT 运算 |
+
+OCCT Boolean 结果可能与源形状共享底层拓扑。1.1.1 的 `deleteShape` 会执行全量几何清理，逐个删除结果可能破坏仍存活源形状。因此当前 Facade 在句柄释放时更新内部引用计数，并在活动句柄归零后统一 `cleanAllCache()`；Worker 终止时也会释放全部 WASM 内存。P3-06 需实现依赖感知的细粒度安全回收和长会话内存基准。
diff --git a/src/App.tsx b/src/App.tsx
index b09dffe..8eb90bc 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -378,7 +378,8 @@ function Viewport({ selectedObject, setSelectedObject, workbench, facade, showNo
     const loadGeometry = async () => {
       const capabilities = await facade.geometry.initialize()
       if (capabilities.status !== 'ready') throw new Error(capabilities.reason || 'OCCT geometry runtime unavailable')
-      shape = await facade.geometry.createBox({ width: 2.7, length: 1.4, height: 1.6, center: [0, 0, 0], originOnCenter: true, documentVersion: facade.app.document.getActive().version })
+      const document = facade.app.document.getActive()
+      shape = await facade.geometry.createBox({ width: 2.7, length: 1.4, height: 1.6, center: [0, 0, 0], originOnCenter: true, documentId: document.id, documentVersion: document.version })
       if (cancelled) {
         await facade.geometry.release(shape)
         shape = null
diff --git a/src/facade/geometryRuntime.ts b/src/facade/geometryRuntime.ts
index 271b123..480c060 100644
--- a/src/facade/geometryRuntime.ts
+++ b/src/facade/geometryRuntime.ts
@@ -1,6 +1,6 @@
 import { BitByBitOCCT, OccStateEnum } from '@bitbybit-dev/occt-worker'
 import type { Inputs } from '@bitbybit-dev/occt'
-import type { ApplyPlacementInput, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, GeometryCapabilities, MeshAsset, ShapeHandle } from './types'
+import type { ApplyPlacementInput, BooleanCutInput, BooleanIntersectionInput, BooleanUnionInput, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, GeometryCapabilities, GeometryDocumentContext, MeshAsset, ShapeHandle } from './types'
 
 type KernelShapeReference = Inputs.OCCT.TopoDSShapePointer
 type KernelMesh = Inputs.OCCT.DecomposedMeshDto
@@ -24,8 +24,9 @@ const finiteNonNegative = (value: number, name: string) => {
   if (!Number.isFinite(value) || value < 0) throw new RangeError(`${name} must be a finite non-negative number.`)
 }
 
-const validateDocumentVersion = (value: number) => {
-  if (!Number.isSafeInteger(value) || value < 0) throw new RangeError('documentVersion must be a non-negative safe integer.')
+const validateDocumentContext = (input: GeometryDocumentContext) => {
+  if (!input.documentId.trim()) throw new RangeError('documentId must be a non-empty string.')
+  if (!Number.isSafeInteger(input.documentVersion) || input.documentVersion < 0) throw new RangeError('documentVersion must be a non-negative safe integer.')
 }
 
 const validateVector = (value: [number, number, number], name: string, allowZero = true) => {
@@ -41,7 +42,7 @@ export const validateBoxInput = (input: CreateBoxInput) => {
   finitePositive(input.width, 'width')
   finitePositive(input.length, 'length')
   finitePositive(input.height, 'height')
-  validateDocumentVersion(input.documentVersion)
+  validateDocumentContext(input)
   const center = input.center ?? [0, 0, 0]
   validateVector(center, 'center')
 }
@@ -52,13 +53,13 @@ export const validateCylinderInput = (input: CreateCylinderInput) => {
   validateVector(input.center ?? [0, 0, 0], 'center')
   validateVector(input.direction ?? [0, 1, 0], 'direction', false)
   validateAngle(input.angle ?? 360, 'angle')
-  validateDocumentVersion(input.documentVersion)
+  validateDocumentContext(input)
 }
 
 export const validateSphereInput = (input: CreateSphereInput) => {
   finitePositive(input.radius, 'radius')
   validateVector(input.center ?? [0, 0, 0], 'center')
-  validateDocumentVersion(input.documentVersion)
+  validateDocumentContext(input)
 }
 
 export const validateConeInput = (input: CreateConeInput) => {
@@ -69,18 +70,39 @@ export const validateConeInput = (input: CreateConeInput) => {
   validateVector(input.center ?? [0, 0, 0], 'center')
   validateVector(input.direction ?? [0, 1, 0], 'direction', false)
   validateAngle(input.angle ?? 360, 'angle')
-  validateDocumentVersion(input.documentVersion)
+  validateDocumentContext(input)
 }
 
 export const validatePlacementInput = (input: ApplyPlacementInput) => {
   validateVector(input.placement.translation, 'translation')
   validateVector(input.placement.rotationAxis, 'rotationAxis', false)
   validateAngle(input.placement.rotationAngle, 'rotationAngle', true)
-  validateDocumentVersion(input.documentVersion)
+  validateDocumentContext(input)
+  validateShapeContext(input, input.shape)
 }
 
+const validateShapeContext = (input: GeometryDocumentContext, shape: ShapeHandle) => {
+  if (shape.documentId !== input.documentId) throw new Error(`Shape belongs to another document: ${shape.id}`)
+  if (shape.documentVersion > input.documentVersion) throw new Error(`Shape version is newer than the result context: ${shape.id}`)
+}
+
+const validateBooleanShapes = (input: GeometryDocumentContext, shapes: ShapeHandle[], minimum: number) => {
+  validateDocumentContext(input)
+  if (shapes.length < minimum) throw new RangeError(`Boolean operation requires at least ${minimum} shape${minimum === 1 ? '' : 's'}.`)
+  for (const shape of shapes) validateShapeContext(input, shape)
+}
+
+export const validateBooleanUnionInput = (input: BooleanUnionInput) => validateBooleanShapes(input, input.shapes, 2)
+
+export const validateBooleanCutInput = (input: BooleanCutInput) => {
+  validateBooleanShapes(input, [input.base, ...input.tools], 2)
+  if (input.tools.length === 0) throw new RangeError('Boolean cut requires at least one tool shape.')
+}
+
+export const validateBooleanIntersectionInput = (input: BooleanIntersectionInput) => validateBooleanShapes(input, input.shapes, 2)
+
 export const assertShapeHandleIntegrity = (actual: ShapeHandle, expected: ShapeHandle) => {
-  if (actual.id !== expected.id || actual.kernel !== expected.kernel || actual.kind !== expected.kind || actual.documentVersion !== expected.documentVersion) throw new Error(`Shape handle integrity check failed: ${actual.id}`)
+  if (actual.id !== expected.id || actual.kernel !== expected.kernel || actual.kind !== expected.kind || actual.documentId !== expected.documentId || actual.documentVersion !== expected.documentVersion) throw new Error(`Shape handle integrity check failed: ${actual.id}`)
 }
 
 const appendFace = (face: Inputs.OCCT.DecomposedFaceDto, positions: number[], normals: number[], indices: number[]) => {
@@ -194,7 +216,7 @@ export class BitbybitGeometryRuntime {
       center: input.center ?? [0, 0, 0],
       originOnCenter: input.originOnCenter ?? true,
     })
-    return this.registerShape(kernelShape, input.documentVersion)
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
   }
 
   async createCylinder(input: CreateCylinderInput): Promise<ShapeHandle> {
@@ -208,14 +230,14 @@ export class BitbybitGeometryRuntime {
       angle: input.angle ?? 360,
       originOnCenter: input.originOnCenter ?? false,
     })
-    return this.registerShape(kernelShape, input.documentVersion)
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
   }
 
   async createSphere(input: CreateSphereInput): Promise<ShapeHandle> {
     validateSphereInput(input)
     const client = await this.readyClient()
     const kernelShape = await client.occt.shapes.solid.createSphere({ radius: input.radius, center: input.center ?? [0, 0, 0] })
-    return this.registerShape(kernelShape, input.documentVersion)
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
   }
 
   async createCone(input: CreateConeInput): Promise<ShapeHandle> {
@@ -229,7 +251,7 @@ export class BitbybitGeometryRuntime {
       center: input.center ?? [0, 0, 0],
       direction: input.direction ?? [0, 1, 0],
     })
-    return this.registerShape(kernelShape, input.documentVersion)
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
   }
 
   async applyPlacement(input: ApplyPlacementInput): Promise<ShapeHandle> {
@@ -243,7 +265,32 @@ export class BitbybitGeometryRuntime {
       rotationAngle: input.placement.rotationAngle,
       scaleFactor: 1,
     })
-    return this.registerShape(kernelShape, input.documentVersion)
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
+  }
+
+  async union(input: BooleanUnionInput): Promise<ShapeHandle> {
+    validateBooleanUnionInput(input)
+    const shapes = input.shapes.map((shape) => this.resolveShape(shape).reference)
+    const client = await this.readyClient()
+    const kernelShape = await client.occt.booleans.union({ shapes, keepEdges: input.keepEdges ?? false })
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
+  }
+
+  async cut(input: BooleanCutInput): Promise<ShapeHandle> {
+    validateBooleanCutInput(input)
+    const base = this.resolveShape(input.base).reference
+    const tools = input.tools.map((shape) => this.resolveShape(shape).reference)
+    const client = await this.readyClient()
+    const kernelShape = await client.occt.booleans.difference({ shape: base, shapes: tools, keepEdges: input.keepEdges ?? false })
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
+  }
+
+  async intersection(input: BooleanIntersectionInput): Promise<ShapeHandle> {
+    validateBooleanIntersectionInput(input)
+    const shapes = input.shapes.map((shape) => this.resolveShape(shape).reference)
+    const client = await this.readyClient()
+    const kernelShape = await client.occtWorkerManager.genericCallToWorkerPromise('plugins.boolean.intersection', { shapes, keepEdges: input.keepEdges ?? false }) as KernelShapeReference
+    return this.registerShape(kernelShape, input.documentId, input.documentVersion)
   }
 
   async mesh(shape: ShapeHandle, precision = 0.05): Promise<MeshAsset> {
@@ -266,7 +313,7 @@ export class BitbybitGeometryRuntime {
     }
     this.kernelReferences.delete(entry.reference.hash)
     const client = this.client
-    if (client && this.capabilitiesState.status === 'ready') await client.occt.deleteShape({ shape: entry.reference })
+    if (client && this.capabilitiesState.status === 'ready' && this.shapes.size === 0) await client.occt.cleanAllCache()
   }
 
   dispose() {
@@ -288,11 +335,12 @@ export class BitbybitGeometryRuntime {
     return this.client
   }
 
-  private registerShape(reference: KernelShapeReference, documentVersion: number) {
+  private registerShape(reference: KernelShapeReference, documentId: string, documentVersion: number) {
     const handle: ShapeHandle = {
       id: `shape-${Date.now().toString(36)}-${(++this.sequence).toString(36)}`,
       kernel: 'bitbybit-occt',
       kind: 'solid',
+      documentId,
       documentVersion,
     }
     const kernelReference = this.kernelReferences.get(reference.hash)
diff --git a/src/facade/geometryWorker.ts b/src/facade/geometryWorker.ts
index 7913cc6..72a4897 100644
--- a/src/facade/geometryWorker.ts
+++ b/src/facade/geometryWorker.ts
@@ -1,14 +1,50 @@
 /// <reference lib="webworker" />
 
 import createBitbybitDevOcct from '@bitbybit-dev/occt/bitbybit-dev-occt/bitbybit-dev-occt'
+import type { MainModule, TopoDS_Shape } from '@bitbybit-dev/occt/bitbybit-dev-occt/bitbybit-dev-occt'
 import { initializationComplete, onMessageInput } from '@bitbybit-dev/occt-worker'
 
 const workerScope = self as DedicatedWorkerGlobalScope
 
+const createWebCadPlugins = (occt: MainModule) => ({
+  dependencies: {},
+  boolean: {
+    intersection: (inputs: { shapes: TopoDS_Shape[]; keepEdges: boolean }) => {
+      if (inputs.shapes.length < 2) throw new Error('Intersection requires at least two shapes.')
+      let current = inputs.shapes[0]
+      let ownsCurrent = false
+      try {
+        for (const next of inputs.shapes.slice(1)) {
+          const operation = new occt.BRepAlgoAPI_Common(current, next)
+          operation.Build()
+          if (!operation.IsDone() || operation.HasErrors()) {
+            operation.delete()
+            throw new Error('OCCT common operation failed.')
+          }
+          const common = operation.Shape()
+          operation.delete()
+          if (ownsCurrent) current.delete()
+          current = common
+          ownsCurrent = true
+        }
+        if (!inputs.keepEdges) {
+          const unified = occt.ShapeUpgrade_UnifySameDomain_Perform(current, true, true, false)
+          current.delete()
+          current = unified
+        }
+        return current
+      } catch (error) {
+        if (ownsCurrent) current.delete()
+        throw error
+      }
+    },
+  },
+})
+
 const initialize = async () => {
   try {
     const occt = await createBitbybitDevOcct()
-    initializationComplete(occt, undefined)
+    initializationComplete(occt, createWebCadPlugins(occt))
     workerScope.onmessage = ({ data }) => onMessageInput(data, (message) => workerScope.postMessage(message))
   } catch (error) {
     workerScope.postMessage({
diff --git a/src/facade/index.ts b/src/facade/index.ts
index 06ba6de..33f5136 100644
--- a/src/facade/index.ts
+++ b/src/facade/index.ts
@@ -1,6 +1,6 @@
 export { createMockFacade } from './mockFacade'
 export { createSqliteProjectPersistence, PersistenceWriteQueue, ProjectAutosaveScheduler, SqliteProjectPersistence } from './projectStore'
 export { ThreeViewportAdapter } from './threeViewport'
-export { assertShapeHandleIntegrity, BitbybitGeometryRuntime, normalizeBitbybitMesh, validateBoxInput, validateConeInput, validateCylinderInput, validatePlacementInput, validateSphereInput } from './geometryRuntime'
+export { assertShapeHandleIntegrity, BitbybitGeometryRuntime, normalizeBitbybitMesh, validateBooleanCutInput, validateBooleanIntersectionInput, validateBooleanUnionInput, validateBoxInput, validateConeInput, validateCylinderInput, validatePlacementInput, validateSphereInput } from './geometryRuntime'
 export { PROJECT_SCHEMA_MIGRATIONS, PROJECT_SCHEMA_SQL, PROJECT_SCHEMA_VERSION } from './projectSchema'
-export type { ApplyPlacementInput, BitBybitViewportAdapter, BitBybitWebCadFacade, CommandState, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, DocumentSnapshot, FacadeEvent, FacadeState, GeometryCapabilities, MeshAsset, ModelTreeItem, PersistenceCapabilities, Placement, ProjectResource, ProjectSaveResult, ShapeHandle, SubshapeRef, TaskSnapshot } from './types'
+export type { ApplyPlacementInput, BitBybitViewportAdapter, BitBybitWebCadFacade, BooleanCutInput, BooleanIntersectionInput, BooleanUnionInput, CommandState, CreateBoxInput, CreateConeInput, CreateCylinderInput, CreateSphereInput, DocumentSnapshot, FacadeEvent, FacadeState, GeometryCapabilities, GeometryDocumentContext, MeshAsset, ModelTreeItem, PersistenceCapabilities, Placement, ProjectResource, ProjectSaveResult, ShapeHandle, SubshapeRef, TaskSnapshot } from './types'
diff --git a/src/facade/mockFacade.ts b/src/facade/mockFacade.ts
index 110d449..0e3d41e 100644
--- a/src/facade/mockFacade.ts
+++ b/src/facade/mockFacade.ts
@@ -132,7 +132,7 @@ export function createMockFacade(): BitBybitWebCadFacade {
     selection: { getObjectId: () => state.selectedObjectId, select, clear: () => select('') },
     task: { getActive: () => getState().task, begin: beginTask, update: (draft) => { if (state.task) state = { ...state, task: { ...state.task, draft: { ...state.task.draft, ...draft } } }; emitState() }, apply: applyTask, cancel: () => { if (state.task) state = { ...state, task: { ...state.task, status: 'cancelled' } }; emitState() } },
     project: { capabilities: () => projectPersistence.capabilities(), save: (document = getState().document) => projectPersistence.save(document), load: (documentId) => projectPersistence.load(documentId), resource: projectPersistence.resource },
-    geometry: { capabilities: () => geometryRuntime.capabilities(), initialize: () => geometryRuntime.initialize(), createBox: (input) => geometryRuntime.createBox(input), createCylinder: (input) => geometryRuntime.createCylinder(input), createSphere: (input) => geometryRuntime.createSphere(input), createCone: (input) => geometryRuntime.createCone(input), applyPlacement: (input) => geometryRuntime.applyPlacement(input), mesh: (shape, precision) => geometryRuntime.mesh(shape, precision), release: (shape) => geometryRuntime.release(shape), dispose: () => geometryRuntime.dispose() },
+    geometry: { capabilities: () => geometryRuntime.capabilities(), initialize: () => geometryRuntime.initialize(), createBox: (input) => geometryRuntime.createBox(input), createCylinder: (input) => geometryRuntime.createCylinder(input), createSphere: (input) => geometryRuntime.createSphere(input), createCone: (input) => geometryRuntime.createCone(input), applyPlacement: (input) => geometryRuntime.applyPlacement(input), union: (input) => geometryRuntime.union(input), cut: (input) => geometryRuntime.cut(input), intersection: (input) => geometryRuntime.intersection(input), mesh: (shape, precision) => geometryRuntime.mesh(shape, precision), release: (shape) => geometryRuntime.release(shape), dispose: () => geometryRuntime.dispose() },
     viewport: { createAdapter: () => new ThreeViewportAdapter() },
     getState, subscribe: (listener) => { listeners.add(listener); return () => { listeners.delete(listener) } }, notify,
   }
diff --git a/src/facade/types.ts b/src/facade/types.ts
index 9239d9f..aeddef7 100644
--- a/src/facade/types.ts
+++ b/src/facade/types.ts
@@ -54,6 +54,7 @@ export type ShapeHandle = {
   readonly id: string
   readonly kernel: 'bitbybit-occt'
   readonly kind: 'solid'
+  readonly documentId: string
   readonly documentVersion: number
 }
 
@@ -76,39 +77,40 @@ export type MeshAsset = {
   }
 }
 
-export type CreateBoxInput = {
+export type GeometryDocumentContext = {
+  documentId: string
+  documentVersion: number
+}
+
+export type CreateBoxInput = GeometryDocumentContext & {
   width: number
   length: number
   height: number
   center?: [number, number, number]
   originOnCenter?: boolean
-  documentVersion: number
 }
 
-export type CreateCylinderInput = {
+export type CreateCylinderInput = GeometryDocumentContext & {
   radius: number
   height: number
   center?: [number, number, number]
   direction?: [number, number, number]
   angle?: number
   originOnCenter?: boolean
-  documentVersion: number
 }
 
-export type CreateSphereInput = {
+export type CreateSphereInput = GeometryDocumentContext & {
   radius: number
   center?: [number, number, number]
-  documentVersion: number
 }
 
-export type CreateConeInput = {
+export type CreateConeInput = GeometryDocumentContext & {
   radius1: number
   radius2: number
   height: number
   center?: [number, number, number]
   direction?: [number, number, number]
   angle?: number
-  documentVersion: number
 }
 
 export type Placement = {
@@ -117,10 +119,25 @@ export type Placement = {
   rotationAngle: number
 }
 
-export type ApplyPlacementInput = {
+export type ApplyPlacementInput = GeometryDocumentContext & {
   shape: ShapeHandle
   placement: Placement
-  documentVersion: number
+}
+
+export type BooleanUnionInput = GeometryDocumentContext & {
+  shapes: ShapeHandle[]
+  keepEdges?: boolean
+}
+
+export type BooleanCutInput = GeometryDocumentContext & {
+  base: ShapeHandle
+  tools: ShapeHandle[]
+  keepEdges?: boolean
+}
+
+export type BooleanIntersectionInput = GeometryDocumentContext & {
+  shapes: ShapeHandle[]
+  keepEdges?: boolean
 }
 
 export type CommandState = {
@@ -246,6 +263,9 @@ export interface BitBybitWebCadFacade {
     createSphere(input: CreateSphereInput): Promise<ShapeHandle>
     createCone(input: CreateConeInput): Promise<ShapeHandle>
     applyPlacement(input: ApplyPlacementInput): Promise<ShapeHandle>
+    union(input: BooleanUnionInput): Promise<ShapeHandle>
+    cut(input: BooleanCutInput): Promise<ShapeHandle>
+    intersection(input: BooleanIntersectionInput): Promise<ShapeHandle>
     mesh(shape: ShapeHandle, precision?: number): Promise<MeshAsset>
     release(shape: ShapeHandle): Promise<void>
     dispose(): void
diff --git a/tests/facade.test.ts b/tests/facade.test.ts
index 939336e..360b8b6 100644
--- a/tests/facade.test.ts
+++ b/tests/facade.test.ts
@@ -3,7 +3,7 @@ import assert from 'node:assert/strict'
 import { createMockFacade } from '../src/facade/mockFacade'
 import { PROJECT_SCHEMA_MIGRATIONS, PROJECT_SCHEMA_SQL, PROJECT_SCHEMA_VERSION } from '../src/facade/projectSchema'
 import { PersistenceWriteQueue, ProjectAutosaveScheduler } from '../src/facade/projectStore'
-import { assertShapeHandleIntegrity, normalizeBitbybitMesh, validateBoxInput, validateConeInput, validateCylinderInput, validatePlacementInput, validateSphereInput } from '../src/facade/geometryRuntime'
+import { assertShapeHandleIntegrity, normalizeBitbybitMesh, validateBooleanUnionInput, validateBoxInput, validateConeInput, validateCylinderInput, validatePlacementInput, validateSphereInput } from '../src/facade/geometryRuntime'
 import type { ShapeHandle } from '../src/facade/types'
 
 test('facade exposes a stable initial document projection', () => {
@@ -17,24 +17,34 @@ test('facade exposes a stable initial document projection', () => {
 })
 
 test('geometry boundary validates dimensions before invoking OCCT', () => {
-  assert.throws(() => validateBoxInput({ width: 0, length: 2, height: 3, documentVersion: 1 }), /width/)
-  assert.throws(() => validateBoxInput({ width: 1, length: 2, height: 3, center: [0, Number.NaN, 0], documentVersion: 1 }), /center/)
-  assert.doesNotThrow(() => validateBoxInput({ width: 1, length: 2, height: 3, documentVersion: 0 }))
-  assert.throws(() => validateCylinderInput({ radius: 1, height: 2, direction: [0, 0, 0], documentVersion: 1 }), /direction/)
-  assert.throws(() => validateSphereInput({ radius: -1, documentVersion: 1 }), /radius/)
-  assert.throws(() => validateConeInput({ radius1: 0, radius2: 0, height: 2, documentVersion: 1 }), /radius/)
-  assert.throws(() => validatePlacementInput({ shape: { id: 'shape', kernel: 'bitbybit-occt', kind: 'solid', documentVersion: 1 }, placement: { translation: [0, 0, 0], rotationAxis: [0, 0, 0], rotationAngle: 0 }, documentVersion: 2 }), /rotationAxis/)
+  assert.throws(() => validateBoxInput({ width: 0, length: 2, height: 3, documentId: 'doc', documentVersion: 1 }), /width/)
+  assert.throws(() => validateBoxInput({ width: 1, length: 2, height: 3, center: [0, Number.NaN, 0], documentId: 'doc', documentVersion: 1 }), /center/)
+  assert.doesNotThrow(() => validateBoxInput({ width: 1, length: 2, height: 3, documentId: 'doc', documentVersion: 0 }))
+  assert.throws(() => validateCylinderInput({ radius: 1, height: 2, direction: [0, 0, 0], documentId: 'doc', documentVersion: 1 }), /direction/)
+  assert.throws(() => validateSphereInput({ radius: -1, documentId: 'doc', documentVersion: 1 }), /radius/)
+  assert.throws(() => validateConeInput({ radius1: 0, radius2: 0, height: 2, documentId: 'doc', documentVersion: 1 }), /radius/)
+  assert.throws(() => validatePlacementInput({ shape: { id: 'shape', kernel: 'bitbybit-occt', kind: 'solid', documentId: 'doc', documentVersion: 1 }, placement: { translation: [0, 0, 0], rotationAxis: [0, 0, 0], rotationAngle: 0 }, documentId: 'doc', documentVersion: 2 }), /rotationAxis/)
 })
 
 test('geometry handles reject forged document ownership', () => {
-  const expected: ShapeHandle = { id: 'shape-one', kernel: 'bitbybit-occt', kind: 'solid', documentVersion: 4 }
+  const expected: ShapeHandle = { id: 'shape-one', kernel: 'bitbybit-occt', kind: 'solid', documentId: 'doc-one', documentVersion: 4 }
   assert.doesNotThrow(() => assertShapeHandleIntegrity({ ...expected }, expected))
   assert.throws(() => assertShapeHandleIntegrity({ ...expected, documentVersion: 5 }, expected), /integrity/)
   assert.throws(() => assertShapeHandleIntegrity({ ...expected, id: 'shape-two' }, expected), /integrity/)
+  assert.throws(() => assertShapeHandleIntegrity({ ...expected, documentId: 'doc-two' }, expected), /integrity/)
+})
+
+test('boolean geometry rejects cross-document and future-version operands', () => {
+  const first: ShapeHandle = { id: 'shape-one', kernel: 'bitbybit-occt', kind: 'solid', documentId: 'doc-one', documentVersion: 2 }
+  const second: ShapeHandle = { ...first, id: 'shape-two', documentVersion: 3 }
+  assert.doesNotThrow(() => validateBooleanUnionInput({ shapes: [first, second], documentId: 'doc-one', documentVersion: 3 }))
+  assert.throws(() => validateBooleanUnionInput({ shapes: [first, { ...second, documentId: 'doc-two' }], documentId: 'doc-one', documentVersion: 3 }), /another document/)
+  assert.throws(() => validateBooleanUnionInput({ shapes: [first, second], documentId: 'doc-one', documentVersion: 2 }), /newer/)
+  assert.throws(() => validateBooleanUnionInput({ shapes: [first], documentId: 'doc-one', documentVersion: 2 }), /at least 2/)
 })
 
 test('Bitbybit face meshes are normalized into a facade-owned indexed asset', () => {
-  const shape: ShapeHandle = { id: 'shape-test', kernel: 'bitbybit-occt', kind: 'solid', documentVersion: 7 }
+  const shape: ShapeHandle = { id: 'shape-test', kernel: 'bitbybit-occt', kind: 'solid', documentId: 'doc', documentVersion: 7 }
   const mesh = normalizeBitbybitMesh(shape, {
     faceList: [{ faceIndex: 1, vertexCoord: [0, 0, 0, 2, 0, 0, 0, 3, 0], normalCoord: [0, 0, 1, 0, 0, 1, 0, 0, 1], triIndexes: [0, 1, 2], numberOfTriangles: 1 }],
     edgeList: [], pointsList: [],