fix: trace annotation edits in canvas writeback metadata

lib/canvas/agent-direct-writeback.ts

@@ -3,7 +3,9 @@ import {
   getSelectedMediaNodes,
   getSelectedSlots,
 } from "@/lib/canvas/agent-context";
+import { hasCanvasAgentAnnotationEditIntent } from "@/lib/canvas/agent-annotation-prompt";
 import type {
+  CanvasAgentAnnotationRef,
   CanvasAgentContext,
   CanvasAgentNodeRef,
   CanvasMediaItem,
@@ -69,6 +71,43 @@ function resolveTargetMediaNodes(params: {
     );
 }
 
+function formatAnnotationBrief(annotation: CanvasAgentAnnotationRef) {
+  const parts = [
+    annotation.id,
+    annotation.type,
+    annotation.text ? `text=${annotation.text}` : "",
+    annotation.bounds
+      ? `bounds=${annotation.bounds.x},${annotation.bounds.y},${annotation.bounds.width},${annotation.bounds.height}`
+      : "",
+    annotation.targetPoint
+      ? `target=${annotation.targetPoint.x},${annotation.targetPoint.y}`
+      : "",
+  ].filter(Boolean);
+  return parts.join(";");
+}
+
+function buildAnnotationTraceMetadata(params: {
+  context: CanvasAgentContext;
+  sourceNodeIds: string[];
+  userText?: string | null;
+}) {
+  if (!hasCanvasAgentAnnotationEditIntent(params.userText || "")) return {};
+  const sourceNodeIdSet = new Set(params.sourceNodeIds);
+  const annotations = params.context.annotations
+    .filter((annotation) => sourceNodeIdSet.has(annotation.sourceNodeId))
+    .slice(0, 8);
+  if (annotations.length === 0) return {};
+
+  return {
+    canvasAgentAnnotationIds: annotations.map((annotation) => annotation.id),
+    canvasAgentAnnotationCount: annotations.length,
+    canvasAgentAnnotationBrief: annotations
+      .map(formatAnnotationBrief)
+      .join("\n")
+      .slice(0, 2000),
+  };
+}
+
 export function buildCanvasAgentDirectWritebackPlan(
   params: BuildCanvasAgentDirectWritebackPlanParams
 ): CanvasAgentDirectWritebackPlanResult | null {
@@ -131,6 +170,9 @@ export function buildCanvasAgentDirectWritebackPlan(
         : "insert_beside";
   const mediaItems: CanvasMediaItem[] = resultUrls.map((url, index) => {
     const mediaItemId = `${params.assistantMessageId}:${params.operationLabel}:${index + 1}`;
+    const itemSourceNodeIds = perResultSourceNodeIds[index]
+      ? [perResultSourceNodeIds[index]]
+      : sourceNodeIds;
     return {
       mediaItemId,
       type: params.resultType,
@@ -139,14 +181,17 @@ export function buildCanvasAgentDirectWritebackPlan(
       title:
         params.resultType === "video" ? "Agent 视频结果" : "Agent 图片结果",
       prompt: params.prompt,
-      sourceNodeIds: perResultSourceNodeIds[index]
-        ? [perResultSourceNodeIds[index]]
-        : sourceNodeIds,
+      sourceNodeIds: itemSourceNodeIds,
       metadata: {
         messageId: params.assistantMessageId,
         chatId: params.chatId,
         model: params.model || undefined,
         sourceImageUrls: params.sourceImageUrls || [],
+        ...buildAnnotationTraceMetadata({
+          context: params.context,
+          sourceNodeIds: itemSourceNodeIds,
+          userText: params.requestTextContent || params.prompt,
+        }),
       },
     };
   });

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

@@ -570,6 +570,52 @@ test.describe("canvas chat pure helpers", () => {
     });
   });
 
+  test("records annotation trace metadata for direct annotation edits", () => {
+    const context: CanvasAgentContext = {
+      ...plannerContext,
+      annotations: [
+        {
+          id: "annotation-keep-bg",
+          sourceNodeId: "image-1",
+          type: "text-note",
+          text: "背景换成浅灰",
+          bounds: { x: 0.1, y: 0.2, width: 0.3, height: 0.4 },
+        },
+        {
+          id: "annotation-other",
+          sourceNodeId: "image-other",
+          type: "text-note",
+          text: "不应进入 image-1 的结果 metadata",
+        },
+      ],
+    };
+
+    const result = buildCanvasAgentDirectWritebackPlan({
+      projectId: plannerContext.projectId || "",
+      chatId: "chat-1",
+      assistantMessageId: "assistant-annotation-edit",
+      operationLabel: "agent-edit-image",
+      resultType: "image",
+      resultUrls: ["https://cdn.example.com/annotation-edit.png"],
+      prompt: "按批注修改这张图",
+      requestTextContent: "按批注修改这张图",
+      mode: "edit",
+      context,
+      targetRefs: [{ nodeId: "image-1" }],
+    });
+
+    expect(result?.mediaItems[0]?.metadata).toMatchObject({
+      canvasAgentAnnotationIds: ["annotation-keep-bg"],
+      canvasAgentAnnotationCount: 1,
+    });
+    expect(
+      String(result?.mediaItems[0]?.metadata?.canvasAgentAnnotationBrief || "")
+    ).toContain("背景换成浅灰");
+    expect(
+      String(result?.mediaItems[0]?.metadata?.canvasAgentAnnotationBrief || "")
+    ).not.toContain("annotation-other");
+  });
+
   test("plans direct batch generations beside each matched source", () => {
     const context: CanvasAgentContext = {
       ...plannerContext,