fix: route explicit canvas slot creation

app/(chat)/api/chat/route.ts

@@ -4064,6 +4064,55 @@ export async function POST(request: Request) {
     const canvasExplicitOperationPlan = resolveCanvasExplicitOperationPlan();
     if (canvasExplicitOperationPlan) {
       const { operationPlan } = canvasExplicitOperationPlan;
+      if (
+        operationPlan.operation === "create_agent_slot" &&
+        !canvasAgentFeatures.slotEnabled
+      ) {
+        const canvasSlotDisabledStream = createUIMessageStream({
+          execute: async ({ writer }) => {
+            const messageId = generateUUID();
+            const slotDisabledReply = "当前画布 Agent Slot 能力暂未开启。";
+            writeAgentProgressChunk(
+              writer,
+              {
+                stage: "completed",
+                currentStep: "finalize",
+                title: "画布槽位未创建",
+                message: slotDisabledReply,
+                toolName: "canvasOperation",
+                capability: operationPlan.operation,
+              },
+              "canvas-explicit:slot-disabled",
+            );
+            writeAssistantTextChunk(
+              writer,
+              slotDisabledReply,
+              "canvas-explicit:slot-disabled-reply",
+              messageId,
+            );
+            await saveMessages({
+              messages: [
+                {
+                  id: messageId,
+                  chatId: id,
+                  role: "assistant",
+                  parts: [{ type: "text", text: slotDisabledReply }],
+                  attachments: [],
+                  createdAt: new Date(),
+                  videoStorageStatus: null,
+                  temporaryVideoUrl: null,
+                  permanentVideoUrl: null,
+                  archivedAt: null,
+                  videoMetadata: null,
+                },
+              ],
+            });
+          },
+        });
+
+        return createSseResponse(canvasSlotDisabledStream);
+      }
+
       const canvasExplicitStream = createUIMessageStream({
         execute: async ({ writer }) => {
           const messageId = generateUUID();

lib/canvas/agent-explicit-operations.ts

@@ -2,8 +2,16 @@ import type {
   CanvasAgentContext,
   CanvasOperationPlan,
 } from "@/types/canvas/agent-protocol";
+import {
+  buildCanvasAgentSlotCreationPlan,
+  resolveCanvasAgentSlotCreationIntent,
+} from "@/lib/canvas/agent-model-planner";
 
-type ExplicitOperationKind = "create_text_node" | "rename_node" | "update_note";
+type ExplicitOperationKind =
+  | "create_agent_slot"
+  | "create_text_node"
+  | "rename_node"
+  | "update_note";
 
 export type CanvasAgentExplicitOperationPlan = {
   operationPlan: CanvasOperationPlan;
@@ -190,6 +198,49 @@ function buildCreateTextOperation(params: {
   };
 }
 
+function getSlotTypeLabel(slotType: "image" | "video" | "ui-screen") {
+  if (slotType === "video") return "视频";
+  if (slotType === "ui-screen") return "UI";
+  return "图片";
+}
+
+function buildCreateAgentSlotOperation(params: {
+  context: CanvasAgentContext;
+  projectId: string;
+  messageId: string;
+  chatId: string;
+  userText: string;
+}): CanvasAgentExplicitOperationPlan | null {
+  const intent = resolveCanvasAgentSlotCreationIntent({
+    userText: params.userText,
+  });
+  if (!intent.shouldCreate || intent.combinedWithMediaExecution) return null;
+
+  const operationPlan = buildCanvasAgentSlotCreationPlan({
+    ...params,
+    slotType: intent.slotType,
+    slotLabel: intent.label,
+    aspectRatio: intent.aspectRatio,
+  });
+  if (!operationPlan) return null;
+
+  const slotTypeLabel = getSlotTypeLabel(intent.slotType);
+  return {
+    operationPlan: {
+      ...operationPlan,
+      metadata: {
+        ...(operationPlan.metadata || {}),
+        planner: "deterministic",
+      },
+    },
+    reply: `已在当前画布创建${slotTypeLabel}槽位。`,
+    progressTitle: "正在创建画布槽位",
+    progressMessage: `我会在当前视口中心创建一个空${slotTypeLabel}槽位。`,
+    completedTitle: "画布槽位已创建",
+    failedTitle: "画布槽位创建失败",
+  };
+}
+
 function buildRenameOperation(params: {
   context: CanvasAgentContext;
   projectId: string;
@@ -300,6 +351,7 @@ export function buildCanvasAgentExplicitOperationPlan(params: {
   }
 
   return (
+    buildCreateAgentSlotOperation(commonParams) ||
     buildCreateTextOperation(commonParams) ||
     buildRenameOperation(commonParams) ||
     buildUpdateNoteOperation(commonParams)

tests/routes/canvas-chat-helpers.test.ts

@@ -944,6 +944,40 @@ test.describe("canvas chat pure helpers", () => {
     });
   });
 
+  test("builds deterministic agent slot creation plans from explicit canvas prompts", () => {
+    const context: CanvasAgentContext = {
+      ...plannerContext,
+      viewport: { x: 0, y: 0, zoom: 1, width: 1000, height: 800 },
+      focusPolicy: "auto",
+    };
+    const outcome = buildCanvasAgentExplicitOperationPlan({
+      context,
+      projectId: plannerContext.projectId || "",
+      messageId: "message-1",
+      chatId: "chat-1",
+      userText: "新建一个 9:16 视频槽位",
+    });
+
+    expect(outcome?.operationPlan).toMatchObject({
+      operation: "create_agent_slot",
+      targetPosition: { x: 320, y: 290 },
+      slot: {
+        slotType: "video",
+        label: "视频槽位",
+        aspectRatio: "9:16",
+        fillPolicy: "replace-empty",
+        acceptedSources: ["text", "image", "selection", "annotation"],
+      },
+      preserveOriginal: true,
+      metadata: {
+        messageId: "message-1",
+        chatId: "chat-1",
+        planner: "deterministic",
+      },
+    });
+    expect(outcome?.reply).toContain("视频槽位");
+  });
+
   test("builds deterministic node rename plans without treating titles as image edits", () => {
     const outcome = buildCanvasAgentExplicitOperationPlan({
       context: plannerContext,
@@ -1006,6 +1040,16 @@ test.describe("canvas chat pure helpers", () => {
         userText: "生成一张图，标题文字：新品上市",
       })
     ).toBeNull();
+
+    expect(
+      buildCanvasAgentExplicitOperationPlan({
+        context: plannerContext,
+        projectId: plannerContext.projectId || "",
+        messageId: "message-1",
+        chatId: "chat-1",
+        userText: "新建一个视频槽位并生成片头",
+      })
+    ).toBeNull();
   });
 
   test("normalizes model-planned annotations to selected media nodes", () => {