diff --git a/components/canvas/__tests__/canvas-flow-reconciliation-helpers.test.ts b/components/canvas/__tests__/canvas-flow-reconciliation-helpers.test.ts
index 16aad93..b753ca1 100644
--- a/components/canvas/__tests__/canvas-flow-reconciliation-helpers.test.ts
+++ b/components/canvas/__tests__/canvas-flow-reconciliation-helpers.test.ts
@@ -346,6 +346,96 @@ describe("canvas flow reconciliation helpers", () => {
     expect(result.nextPendingLocalNodeDataPins.size).toBe(0);
   });
 
+  it("keeps pinned local node size until convex catches up", () => {
+    const pinnedSize = { width: 419, height: 466 };
+
+    const result = reconcileCanvasFlowNodes({
+      previousNodes: [
+        {
+          id: "node-1",
+          type: "render",
+          position: { x: 120, y: 80 },
+          data: {},
+          style: pinnedSize,
+        },
+      ],
+      incomingNodes: [
+        {
+          id: "node-1",
+          type: "render",
+          position: { x: 120, y: 80 },
+          data: {},
+          style: { width: 640, height: 360 },
+        },
+      ],
+      convexNodes: [{ _id: asNodeId("node-1"), type: "render" }],
+      deletingNodeIds: new Set(),
+      resolvedRealIdByClientRequest: new Map(),
+      pendingConnectionCreateIds: new Set(),
+      preferLocalPositionNodeIds: new Set(),
+      pendingLocalPositionPins: new Map(),
+      pendingLocalNodeSizePins: new Map([["node-1", pinnedSize]]),
+      pendingMovePins: new Map(),
+    });
+
+    expect(result.nodes).toEqual([
+      {
+        id: "node-1",
+        type: "render",
+        position: { x: 120, y: 80 },
+        data: {},
+        style: pinnedSize,
+      },
+    ]);
+    expect(result.nextPendingLocalNodeSizePins).toEqual(
+      new Map([["node-1", pinnedSize]]),
+    );
+  });
+
+  it("clears pinned local node size once convex matches the persisted size", () => {
+    const pinnedSize = { width: 419, height: 466 };
+
+    const result = reconcileCanvasFlowNodes({
+      previousNodes: [
+        {
+          id: "node-1",
+          type: "render",
+          position: { x: 120, y: 80 },
+          data: {},
+          style: pinnedSize,
+        },
+      ],
+      incomingNodes: [
+        {
+          id: "node-1",
+          type: "render",
+          position: { x: 120, y: 80 },
+          data: {},
+          style: pinnedSize,
+        },
+      ],
+      convexNodes: [{ _id: asNodeId("node-1"), type: "render" }],
+      deletingNodeIds: new Set(),
+      resolvedRealIdByClientRequest: new Map(),
+      pendingConnectionCreateIds: new Set(),
+      preferLocalPositionNodeIds: new Set(),
+      pendingLocalPositionPins: new Map(),
+      pendingLocalNodeSizePins: new Map([["node-1", pinnedSize]]),
+      pendingMovePins: new Map(),
+    });
+
+    expect(result.nodes).toEqual([
+      {
+        id: "node-1",
+        type: "render",
+        position: { x: 120, y: 80 },
+        data: {},
+        style: pinnedSize,
+      },
+    ]);
+    expect(result.nextPendingLocalNodeSizePins.size).toBe(0);
+  });
+
   it("filters deleting nodes from incoming reconciliation results", () => {
     const result = reconcileCanvasFlowNodes({
       previousNodes: [
diff --git a/components/canvas/__tests__/use-canvas-flow-reconciliation.test.ts b/components/canvas/__tests__/use-canvas-flow-reconciliation.test.ts
index 1ddb7c8..f4b300e 100644
--- a/components/canvas/__tests__/use-canvas-flow-reconciliation.test.ts
+++ b/components/canvas/__tests__/use-canvas-flow-reconciliation.test.ts
@@ -39,6 +39,7 @@ type HarnessProps = {
   previousConvexNodeIdsSnapshot: Set<string>;
   pendingLocalPositionPins?: Map<string, { x: number; y: number }>;
   pendingLocalNodeDataPins?: Map<string, unknown>;
+  pendingLocalNodeSizePins?: Map<string, { width: number; height: number }>;
   preferLocalPositionNodeIds?: Set<string>;
   isResizingRefOverride?: { current: boolean };
 };
@@ -82,6 +83,9 @@ function HookHarness(props: HarnessProps) {
   const pendingLocalNodeDataUntilConvexMatchesRef = useRef(
     props.pendingLocalNodeDataPins ?? new Map<string, unknown>(),
   );
+  const pendingLocalNodeSizeUntilConvexMatchesRef = useRef(
+    props.pendingLocalNodeSizePins ?? new Map<string, { width: number; height: number }>(),
+  );
   const preferLocalPositionNodeIdsRef = useRef(
     props.preferLocalPositionNodeIds ?? new Set<string>(),
   );
@@ -120,6 +124,7 @@ function HookHarness(props: HarnessProps) {
       pendingConnectionCreatesRef,
       pendingLocalPositionUntilConvexMatchesRef,
       pendingLocalNodeDataUntilConvexMatchesRef,
+      pendingLocalNodeSizeUntilConvexMatchesRef,
       preferLocalPositionNodeIdsRef,
       isDragging: isDraggingRef,
       isResizing: isResizingRef,
diff --git a/components/canvas/__tests__/use-canvas-sync-engine.test.ts b/components/canvas/__tests__/use-canvas-sync-engine.test.ts
index 1abd593..b866f49 100644
--- a/components/canvas/__tests__/use-canvas-sync-engine.test.ts
+++ b/components/canvas/__tests__/use-canvas-sync-engine.test.ts
@@ -160,7 +160,7 @@ describe("useCanvasSyncEngine", () => {
       getEnqueueSyncMutation: () => enqueueSyncMutation,
       getRunBatchRemoveNodes: () => vi.fn(async () => undefined),
       getRunSplitEdgeAtExistingNode: () => vi.fn(async () => undefined),
-      getSetNodes: () => setNodes,
+      getSetNodes: () => setNodes as never,
     });
 
     await controller.queueNodeDataUpdate({
@@ -177,4 +177,46 @@ describe("useCanvasSyncEngine", () => {
       data: { blackPoint: 209 },
     });
   });
+
+  it("pins local node size immediately when queueing a resize", async () => {
+    const enqueueSyncMutation = vi.fn(async () => undefined);
+    let nodes = [
+      {
+        id: "node-1",
+        type: "render",
+        position: { x: 0, y: 0 },
+        data: {},
+        style: { width: 640, height: 360 },
+      },
+    ];
+    const setNodes = (updater: (current: typeof nodes) => typeof nodes) => {
+      nodes = updater(nodes);
+      return nodes;
+    };
+
+    const controller = createCanvasSyncEngineController({
+      canvasId: asCanvasId("canvas-1"),
+      isSyncOnline: true,
+      getEnqueueSyncMutation: () => enqueueSyncMutation,
+      getRunBatchRemoveNodes: () => vi.fn(async () => undefined),
+      getRunSplitEdgeAtExistingNode: () => vi.fn(async () => undefined),
+      getSetNodes: () => setNodes as never,
+    });
+
+    await controller.queueNodeResize({
+      nodeId: asNodeId("node-1"),
+      width: 419,
+      height: 466,
+    });
+
+    expect(nodes[0]?.style).toEqual({ width: 419, height: 466 });
+    expect(controller.pendingLocalNodeSizeUntilConvexMatchesRef.current).toEqual(
+      new Map([["node-1", { width: 419, height: 466 }]]),
+    );
+    expect(enqueueSyncMutation).toHaveBeenCalledWith("resizeNode", {
+      nodeId: asNodeId("node-1"),
+      width: 419,
+      height: 466,
+    });
+  });
 });
diff --git a/components/canvas/canvas-flow-reconciliation-helpers.ts b/components/canvas/canvas-flow-reconciliation-helpers.ts
index 6d2ea0d..7149876 100644
--- a/components/canvas/canvas-flow-reconciliation-helpers.ts
+++ b/components/canvas/canvas-flow-reconciliation-helpers.ts
@@ -354,6 +354,49 @@ function applyLocalNodeDataPins(args: {
   };
 }
 
+function nodeStyleIncludesSizePin(
+  style: RFNode["style"] | undefined,
+  pin: { width: number; height: number },
+): boolean {
+  return style?.width === pin.width && style?.height === pin.height;
+}
+
+function applyLocalNodeSizePins(args: {
+  nodes: RFNode[];
+  pendingLocalNodeSizePins: ReadonlyMap<string, { width: number; height: number }>;
+}): {
+  nodes: RFNode[];
+  nextPendingLocalNodeSizePins: Map<string, { width: number; height: number }>;
+} {
+  const nodeIds = new Set(args.nodes.map((node) => node.id));
+  const nextPendingLocalNodeSizePins = new Map(
+    [...args.pendingLocalNodeSizePins].filter(([nodeId]) => nodeIds.has(nodeId)),
+  );
+  const nodes = args.nodes.map((node) => {
+    const pin = nextPendingLocalNodeSizePins.get(node.id);
+    if (!pin) return node;
+
+    if (nodeStyleIncludesSizePin(node.style, pin)) {
+      nextPendingLocalNodeSizePins.delete(node.id);
+      return node;
+    }
+
+    return {
+      ...node,
+      style: {
+        ...(node.style ?? {}),
+        width: pin.width,
+        height: pin.height,
+      },
+    };
+  });
+
+  return {
+    nodes,
+    nextPendingLocalNodeSizePins,
+  };
+}
+
 export function reconcileCanvasFlowNodes(args: {
   previousNodes: RFNode[];
   incomingNodes: RFNode[];
@@ -364,12 +407,14 @@ export function reconcileCanvasFlowNodes(args: {
   preferLocalPositionNodeIds: ReadonlySet<string>;
   pendingLocalPositionPins: ReadonlyMap<string, { x: number; y: number }>;
   pendingLocalNodeDataPins?: ReadonlyMap<string, unknown>;
+  pendingLocalNodeSizePins?: ReadonlyMap<string, { width: number; height: number }>;
   pendingMovePins: ReadonlyMap<string, { x: number; y: number }>;
 }): {
   nodes: RFNode[];
   inferredRealIdByClientRequest: Map<string, Id<"nodes">>;
   nextPendingLocalPositionPins: Map<string, { x: number; y: number }>;
   nextPendingLocalNodeDataPins: Map<string, unknown>;
+  nextPendingLocalNodeSizePins: Map<string, { width: number; height: number }>;
   clearedPreferLocalPositionNodeIds: string[];
 } {
   const inferredRealIdByClientRequest = inferPendingConnectionNodeHandoff({
@@ -392,8 +437,12 @@ export function reconcileCanvasFlowNodes(args: {
     nodes: mergedNodes,
     pendingLocalNodeDataPins: args.pendingLocalNodeDataPins ?? new Map(),
   });
-  const pinnedNodes = applyLocalPositionPins({
+  const sizePinnedNodes = applyLocalNodeSizePins({
     nodes: dataPinnedNodes.nodes,
+    pendingLocalNodeSizePins: args.pendingLocalNodeSizePins ?? new Map(),
+  });
+  const pinnedNodes = applyLocalPositionPins({
+    nodes: sizePinnedNodes.nodes,
     pendingLocalPositionPins: args.pendingLocalPositionPins,
   });
   const nodes = applyPinnedNodePositionsReadOnly(
@@ -419,6 +468,7 @@ export function reconcileCanvasFlowNodes(args: {
     inferredRealIdByClientRequest,
     nextPendingLocalPositionPins: pinnedNodes.nextPendingLocalPositionPins,
     nextPendingLocalNodeDataPins: dataPinnedNodes.nextPendingLocalNodeDataPins,
+    nextPendingLocalNodeSizePins: sizePinnedNodes.nextPendingLocalNodeSizePins,
     clearedPreferLocalPositionNodeIds,
   };
 }
diff --git a/components/canvas/canvas.tsx b/components/canvas/canvas.tsx
index 5aa2813..0c4330b 100644
--- a/components/canvas/canvas.tsx
+++ b/components/canvas/canvas.tsx
@@ -119,6 +119,7 @@ function CanvasInner({ canvasId }: CanvasInnerProps) {
       pendingConnectionCreatesRef,
       pendingLocalPositionUntilConvexMatchesRef,
       pendingLocalNodeDataUntilConvexMatchesRef,
+      pendingLocalNodeSizeUntilConvexMatchesRef,
       preferLocalPositionNodeIdsRef,
     },
     actions: {
@@ -454,6 +455,7 @@ function CanvasInner({ canvasId }: CanvasInnerProps) {
       pendingConnectionCreatesRef,
       pendingLocalPositionUntilConvexMatchesRef,
       pendingLocalNodeDataUntilConvexMatchesRef,
+      pendingLocalNodeSizeUntilConvexMatchesRef,
       preferLocalPositionNodeIdsRef,
       isDragging,
       isResizing,
diff --git a/components/canvas/use-canvas-flow-reconciliation.ts b/components/canvas/use-canvas-flow-reconciliation.ts
index 8eb68fb..e9622af 100644
--- a/components/canvas/use-canvas-flow-reconciliation.ts
+++ b/components/canvas/use-canvas-flow-reconciliation.ts
@@ -21,6 +21,9 @@ type CanvasFlowReconciliationRefs = {
     Map<string, PositionPin>
   >;
   pendingLocalNodeDataUntilConvexMatchesRef: MutableRefObject<Map<string, unknown>>;
+  pendingLocalNodeSizeUntilConvexMatchesRef: MutableRefObject<
+    Map<string, { width: number; height: number }>
+  >;
   preferLocalPositionNodeIdsRef: MutableRefObject<Set<string>>;
   isDragging: MutableRefObject<boolean>;
   isResizing: MutableRefObject<boolean>;
@@ -56,6 +59,7 @@ export function useCanvasFlowReconciliation(args: {
     pendingConnectionCreatesRef,
     pendingLocalPositionUntilConvexMatchesRef,
     pendingLocalNodeDataUntilConvexMatchesRef,
+    pendingLocalNodeSizeUntilConvexMatchesRef,
     preferLocalPositionNodeIdsRef,
     isDragging,
     isResizing,
@@ -135,6 +139,8 @@ export function useCanvasFlowReconciliation(args: {
         pendingLocalPositionPins: pendingLocalPositionUntilConvexMatchesRef.current,
         pendingLocalNodeDataPins:
           pendingLocalNodeDataUntilConvexMatchesRef.current,
+        pendingLocalNodeSizePins:
+          pendingLocalNodeSizeUntilConvexMatchesRef.current,
         pendingMovePins,
       });
 
@@ -144,6 +150,8 @@ export function useCanvasFlowReconciliation(args: {
         reconciliation.nextPendingLocalPositionPins;
       pendingLocalNodeDataUntilConvexMatchesRef.current =
         reconciliation.nextPendingLocalNodeDataPins;
+      pendingLocalNodeSizeUntilConvexMatchesRef.current =
+        reconciliation.nextPendingLocalNodeSizePins;
       for (const nodeId of reconciliation.clearedPreferLocalPositionNodeIds) {
         preferLocalPositionNodeIdsRef.current.delete(nodeId);
       }
@@ -162,6 +170,7 @@ export function useCanvasFlowReconciliation(args: {
     pendingConnectionCreatesRef,
     pendingLocalPositionUntilConvexMatchesRef,
     pendingLocalNodeDataUntilConvexMatchesRef,
+    pendingLocalNodeSizeUntilConvexMatchesRef,
     preferLocalPositionNodeIdsRef,
     resolvedRealIdByClientRequestRef,
   ]);
diff --git a/components/canvas/use-canvas-sync-engine.ts b/components/canvas/use-canvas-sync-engine.ts
index 86ec50f..9d2e048 100644
--- a/components/canvas/use-canvas-sync-engine.ts
+++ b/components/canvas/use-canvas-sync-engine.ts
@@ -214,6 +214,9 @@ export function createCanvasSyncEngineController({
   const pendingLocalNodeDataUntilConvexMatchesRef = {
     current: new Map<string, unknown>(),
   };
+  const pendingLocalNodeSizeUntilConvexMatchesRef = {
+    current: new Map<string, { width: number; height: number }>(),
+  };
   const preferLocalPositionNodeIdsRef = { current: new Set<string>() };
 
   const flushPendingResizeForClientRequest = async (
@@ -223,6 +226,10 @@ export function createCanvasSyncEngineController({
     const pendingResize = pendingResizeAfterCreateRef.current.get(clientRequestId);
     if (!pendingResize) return;
     pendingResizeAfterCreateRef.current.delete(clientRequestId);
+    pendingLocalNodeSizeUntilConvexMatchesRef.current.delete(
+      `${OPTIMISTIC_NODE_PREFIX}${clientRequestId}`,
+    );
+    pinNodeSizeLocally(realId as string, pendingResize);
     await getEnqueueSyncMutation()("resizeNode", {
       nodeId: realId,
       width: pendingResize.width,
@@ -245,6 +252,25 @@ export function createCanvasSyncEngineController({
     );
   };
 
+  const pinNodeSizeLocally = (nodeId: string, size: { width: number; height: number }): void => {
+    pendingLocalNodeSizeUntilConvexMatchesRef.current.set(nodeId, size);
+    const setNodes = getSetNodes?.();
+    setNodes?.((current) =>
+      current.map((node) =>
+        node.id === nodeId
+          ? {
+              ...node,
+              style: {
+                ...(node.style ?? {}),
+                width: size.width,
+                height: size.height,
+              },
+            }
+          : node,
+      ),
+    );
+  };
+
   const flushPendingDataForClientRequest = async (
     clientRequestId: string,
     realId: Id<"nodes">,
@@ -265,6 +291,10 @@ export function createCanvasSyncEngineController({
     height: number;
   }): Promise<void> => {
     const rawNodeId = args.nodeId as string;
+    pinNodeSizeLocally(rawNodeId, {
+      width: args.width,
+      height: args.height,
+    });
     if (!isOptimisticNodeId(rawNodeId) || !getIsSyncOnline()) {
       await getEnqueueSyncMutation()("resizeNode", args);
       return;
@@ -276,6 +306,11 @@ export function createCanvasSyncEngineController({
       : undefined;
 
     if (resolvedRealId) {
+      pendingLocalNodeSizeUntilConvexMatchesRef.current.delete(rawNodeId);
+      pinNodeSizeLocally(resolvedRealId as string, {
+        width: args.width,
+        height: args.height,
+      });
       await getEnqueueSyncMutation()("resizeNode", {
         nodeId: resolvedRealId,
         width: args.width,
@@ -337,6 +372,7 @@ export function createCanvasSyncEngineController({
         pendingMoveAfterCreateRef.current.delete(clientRequestId);
         pendingResizeAfterCreateRef.current.delete(clientRequestId);
         pendingDataAfterCreateRef.current.delete(clientRequestId);
+        pendingLocalNodeSizeUntilConvexMatchesRef.current.delete(realId as string);
         pendingLocalNodeDataUntilConvexMatchesRef.current.delete(realId as string);
         pendingEdgeSplitByClientRequestRef.current.delete(clientRequestId);
         pendingConnectionCreatesRef.current.delete(clientRequestId);
@@ -487,6 +523,7 @@ export function createCanvasSyncEngineController({
     pendingConnectionCreatesRef,
     pendingLocalPositionUntilConvexMatchesRef,
     pendingLocalNodeDataUntilConvexMatchesRef,
+    pendingLocalNodeSizeUntilConvexMatchesRef,
     preferLocalPositionNodeIdsRef,
     flushPendingResizeForClientRequest,
     flushPendingDataForClientRequest,
@@ -1858,6 +1895,8 @@ export function useCanvasSyncEngine({
         controller.pendingLocalPositionUntilConvexMatchesRef,
       pendingLocalNodeDataUntilConvexMatchesRef:
         controller.pendingLocalNodeDataUntilConvexMatchesRef,
+      pendingLocalNodeSizeUntilConvexMatchesRef:
+        controller.pendingLocalNodeSizeUntilConvexMatchesRef,
       preferLocalPositionNodeIdsRef: controller.preferLocalPositionNodeIdsRef,
       pendingCreatePromiseByClientRequestRef,
     },
diff --git a/convex/ai_errors.ts b/convex/ai_errors.ts
index 24e7b7d..87aa3d9 100644
--- a/convex/ai_errors.ts
+++ b/convex/ai_errors.ts
@@ -145,12 +145,40 @@ export function categorizeError(error: unknown): {
 
 export function formatTerminalStatusMessage(error: unknown): string {
   const code = getErrorCode(error);
-  if (code) {
+  if (code === "OPENROUTER_STRUCTURED_OUTPUT_INVALID_JSON") {
+    return "Provider: Strukturierte Antwort konnte nicht gelesen werden";
+  }
+
+  if (code === "OPENROUTER_STRUCTURED_OUTPUT_MISSING_CONTENT") {
+    return "Provider: Strukturierte Antwort fehlt";
+  }
+
+  if (code && code !== "OPENROUTER_STRUCTURED_OUTPUT_HTTP_ERROR") {
     return code;
   }
 
-  const message = errorMessage(error).trim() || "Generation failed";
-  const { category } = categorizeError(error);
+  const convexData =
+    error instanceof ConvexError ? (error.data as ErrorData | undefined) : undefined;
+
+  const convexDataMessage =
+    typeof convexData?.message === "string" ? convexData.message.trim() : "";
+  const convexDataStatus =
+    typeof convexData?.status === "number" && Number.isFinite(convexData.status)
+      ? convexData.status
+      : null;
+
+  const message =
+    code === "OPENROUTER_STRUCTURED_OUTPUT_HTTP_ERROR"
+      ? convexDataMessage ||
+        (convexDataStatus !== null
+          ? `HTTP ${convexDataStatus}`
+          : "Anfrage fehlgeschlagen")
+      : errorMessage(error).trim() || "Generation failed";
+
+  const { category } =
+    code === "OPENROUTER_STRUCTURED_OUTPUT_HTTP_ERROR"
+      ? { category: "provider" as const }
+      : categorizeError(error);
 
   const prefixByCategory: Record<Exclude<ErrorCategory, "unknown">, string> = {
     credits: "Credits",
diff --git a/convex/openrouter.ts b/convex/openrouter.ts
index 2e0e245..646edbd 100644
--- a/convex/openrouter.ts
+++ b/convex/openrouter.ts
@@ -2,6 +2,155 @@ import { ConvexError } from "convex/values";
 
 export const OPENROUTER_BASE_URL = "https://openrouter.ai/api/v1";
 
+function parseJsonSafely(text: string):
+  | { ok: true; value: unknown }
+  | { ok: false } {
+  try {
+    return { ok: true, value: JSON.parse(text) };
+  } catch {
+    return { ok: false };
+  }
+}
+
+function extractTextFromStructuredContent(content: unknown): string | undefined {
+  if (typeof content === "string") {
+    return content;
+  }
+
+  if (!Array.isArray(content)) {
+    return undefined;
+  }
+
+  const textParts: string[] = [];
+  for (const part of content) {
+    if (typeof part === "string") {
+      textParts.push(part);
+      continue;
+    }
+    if (!part || typeof part !== "object") {
+      continue;
+    }
+
+    const partRecord = part as Record<string, unknown>;
+    if (typeof partRecord.text === "string") {
+      textParts.push(partRecord.text);
+    }
+  }
+
+  return textParts.length > 0 ? textParts.join("") : undefined;
+}
+
+function extractFencedJsonPayload(text: string): string | undefined {
+  const fencedBlockRegex = /```(?:json)?\s*([\s\S]*?)\s*```/gi;
+  let match: RegExpExecArray | null;
+  while ((match = fencedBlockRegex.exec(text)) !== null) {
+    const payload = match[1];
+    if (typeof payload === "string" && payload.trim() !== "") {
+      return payload;
+    }
+  }
+  return undefined;
+}
+
+function extractBalancedJsonCandidate(text: string, startIndex: number): string | undefined {
+  const startChar = text[startIndex];
+  if (startChar !== "{" && startChar !== "[") {
+    return undefined;
+  }
+
+  const expectedClosings: string[] = [];
+  let inString = false;
+  let isEscaped = false;
+
+  for (let i = startIndex; i < text.length; i += 1) {
+    const ch = text[i]!;
+
+    if (inString) {
+      if (isEscaped) {
+        isEscaped = false;
+        continue;
+      }
+      if (ch === "\\") {
+        isEscaped = true;
+        continue;
+      }
+      if (ch === '"') {
+        inString = false;
+      }
+      continue;
+    }
+
+    if (ch === '"') {
+      inString = true;
+      continue;
+    }
+
+    if (ch === "{") {
+      expectedClosings.push("}");
+      continue;
+    }
+    if (ch === "[") {
+      expectedClosings.push("]");
+      continue;
+    }
+
+    if (ch === "}" || ch === "]") {
+      const expected = expectedClosings.pop();
+      if (expected !== ch) {
+        return undefined;
+      }
+      if (expectedClosings.length === 0) {
+        return text.slice(startIndex, i + 1);
+      }
+    }
+  }
+
+  return undefined;
+}
+
+function extractFirstBalancedJson(text: string): string | undefined {
+  for (let i = 0; i < text.length; i += 1) {
+    const ch = text[i]!;
+    if (ch !== "{" && ch !== "[") {
+      continue;
+    }
+
+    const candidate = extractBalancedJsonCandidate(text, i);
+    if (candidate) {
+      return candidate;
+    }
+  }
+
+  return undefined;
+}
+
+function parseStructuredJsonFromMessageContent(contentText: string):
+  | { ok: true; value: unknown }
+  | { ok: false } {
+  const direct = parseJsonSafely(contentText);
+  if (direct.ok) {
+    return direct;
+  }
+
+  const fencedPayload = extractFencedJsonPayload(contentText);
+  if (fencedPayload) {
+    const fenced = parseJsonSafely(fencedPayload);
+    if (fenced.ok) {
+      return fenced;
+    }
+  }
+
+  const balancedPayload = extractFirstBalancedJson(contentText);
+  if (balancedPayload) {
+    const balanced = parseJsonSafely(balancedPayload);
+    if (balanced.ok) {
+      return balanced;
+    }
+  }
+
+  return { ok: false };
+}
+
 export async function generateStructuredObjectViaOpenRouter<T>(
   apiKey: string,
   args: {
@@ -33,6 +182,7 @@ export async function generateStructuredObjectViaOpenRouter<T>(
           schema: args.schema,
         },
       },
+      plugins: [{ id: "response-healing" }],
     }),
   });
 
@@ -46,21 +196,31 @@ export async function generateStructuredObjectViaOpenRouter<T>(
   }
 
   const data = await response.json();
-  const content = data?.choices?.[0]?.message?.content;
+  const message = data?.choices?.[0]?.message as
+    | Record<string, unknown>
+    | undefined;
 
-  if (typeof content !== "string" || content.trim() === "") {
+  const parsed = message?.parsed;
+  if (parsed && typeof parsed === "object") {
+    return parsed as T;
+  }
+
+  const contentText = extractTextFromStructuredContent(message?.content);
+
+  if (typeof contentText !== "string" || contentText.trim() === "") {
     throw new ConvexError({
       code: "OPENROUTER_STRUCTURED_OUTPUT_MISSING_CONTENT",
     });
   }
 
-  try {
-    return JSON.parse(content) as T;
-  } catch {
+  const parsedContent = parseStructuredJsonFromMessageContent(contentText);
+  if (!parsedContent.ok) {
     throw new ConvexError({
       code: "OPENROUTER_STRUCTURED_OUTPUT_INVALID_JSON",
     });
   }
+
+  return parsedContent.value as T;
 }
 
 export interface OpenRouterModel {
diff --git a/tests/convex/ai-errors.test.ts b/tests/convex/ai-errors.test.ts
index d61439f..81b7adf 100644
--- a/tests/convex/ai-errors.test.ts
+++ b/tests/convex/ai-errors.test.ts
@@ -1,4 +1,5 @@
 import { describe, expect, it } from "vitest";
+import { ConvexError } from "convex/values";
 import { FreepikApiError } from "@/convex/freepik";
 import {
   categorizeError,
@@ -31,6 +32,42 @@ describe("ai error helpers", () => {
     );
   });
 
+  it("formats structured-output invalid json with human-readable provider message", () => {
+    expect(
+      formatTerminalStatusMessage(
+        new ConvexError({ code: "OPENROUTER_STRUCTURED_OUTPUT_INVALID_JSON" }),
+      ),
+    ).toBe("Provider: Strukturierte Antwort konnte nicht gelesen werden");
+  });
+
+  it("formats structured-output missing content with human-readable provider message", () => {
+    expect(
+      formatTerminalStatusMessage(
+        new ConvexError({ code: "OPENROUTER_STRUCTURED_OUTPUT_MISSING_CONTENT" }),
+      ),
+    ).toBe("Provider: Strukturierte Antwort fehlt");
+  });
+
+  it("formats structured-output http error with provider prefix and server message", () => {
+    expect(
+      formatTerminalStatusMessage(
+        new ConvexError({
+          code: "OPENROUTER_STRUCTURED_OUTPUT_HTTP_ERROR",
+          status: 503,
+          message: "OpenRouter API error 503: Upstream timeout",
+        }),
+      ),
+    ).toBe("Provider: OpenRouter API error 503: Upstream timeout");
+  });
+
+  it("formats structured-output http error without falling back to raw code", () => {
+    expect(
+      formatTerminalStatusMessage(
+        new ConvexError({ code: "OPENROUTER_STRUCTURED_OUTPUT_HTTP_ERROR" }),
+      ),
+    ).toBe("Provider: Anfrage fehlgeschlagen");
+  });
+
   it("uses staged poll delays", () => {
     expect(getVideoPollDelayMs(1)).toBe(5000);
     expect(getVideoPollDelayMs(9)).toBe(10000);
diff --git a/tests/convex/openrouter-structured-output.test.ts b/tests/convex/openrouter-structured-output.test.ts
index c16e4b3..8c1301a 100644
--- a/tests/convex/openrouter-structured-output.test.ts
+++ b/tests/convex/openrouter-structured-output.test.ts
@@ -104,9 +104,108 @@ describe("generateStructuredObjectViaOpenRouter", () => {
           schema,
         },
       },
+      plugins: [{ id: "response-healing" }],
     });
   });
 
+  it("parses content when provider returns array text parts", async () => {
+    fetchMock.mockResolvedValueOnce(
+      createMockResponse({
+        ok: true,
+        status: 200,
+        json: {
+          choices: [
+            {
+              message: {
+                content: [
+                  { type: "text", text: '{"title": "Lemon"' },
+                  { type: "text", text: ', "confidence": 0.75}' },
+                ],
+              },
+            },
+          ],
+        },
+      }),
+    );
+
+    const result = await generateStructuredObjectViaOpenRouter<{
+      title: string;
+      confidence: number;
+    }>("test-api-key", {
+      model: "openai/gpt-5-mini",
+      messages: [{ role: "user", content: "hello" }],
+      schemaName: "test_schema",
+      schema: { type: "object" },
+    });
+
+    expect(result).toEqual({ title: "Lemon", confidence: 0.75 });
+  });
+
+  it("parses fenced json content", async () => {
+    fetchMock.mockResolvedValueOnce(
+      createMockResponse({
+        ok: true,
+        status: 200,
+        json: {
+          choices: [
+            {
+              message: {
+                content:
+                  "Here is the result:\n```json\n{\n  \"title\": \"LemonSpace\",\n  \"confidence\": 0.88\n}\n```\nThanks.",
+              },
+            },
+          ],
+        },
+      }),
+    );
+
+    const result = await generateStructuredObjectViaOpenRouter<{
+      title: string;
+      confidence: number;
+    }>("test-api-key", {
+      model: "openai/gpt-5-mini",
+      messages: [{ role: "user", content: "hello" }],
+      schemaName: "test_schema",
+      schema: { type: "object" },
+    });
+
+    expect(result).toEqual({ title: "LemonSpace", confidence: 0.88 });
+  });
+
+  it("returns message.parsed directly when provided", async () => {
+    fetchMock.mockResolvedValueOnce(
+      createMockResponse({
+        ok: true,
+        status: 200,
+        json: {
+          choices: [
+            {
+              message: {
+                parsed: {
+                  title: "Parsed Result",
+                  confidence: 0.99,
+                },
+                content: "not valid json",
+              },
+            },
+          ],
+        },
+      }),
+    );
+
+    const result = await generateStructuredObjectViaOpenRouter<{
+      title: string;
+      confidence: number;
+    }>("test-api-key", {
+      model: "openai/gpt-5-mini",
+      messages: [{ role: "user", content: "hello" }],
+      schemaName: "test_schema",
+      schema: { type: "object" },
+    });
+
+    expect(result).toEqual({ title: "Parsed Result", confidence: 0.99 });
+  });
+
   it("throws ConvexError code when response content is missing", async () => {
     fetchMock.mockResolvedValueOnce(
       createMockResponse({
diff --git a/tests/use-pipeline-preview.test.ts b/tests/use-pipeline-preview.test.ts
index 3c5f13d..6545edc 100644
--- a/tests/use-pipeline-preview.test.ts
+++ b/tests/use-pipeline-preview.test.ts
@@ -1046,4 +1046,144 @@ describe("preview histogram call sites", () => {
       }),
     );
   });
+
+  it("prefers preview aspect ratio for RenderNode resize when pipeline contains crop", async () => {
+    const queueNodeResize = vi.fn(async () => undefined);
+
+    vi.doMock("@/hooks/use-pipeline-preview", () => ({
+      usePipelinePreview: () => ({
+        canvasRef: { current: null },
+        histogram: emptyHistogram(),
+        isRendering: false,
+        hasSource: true,
+        previewAspectRatio: 1,
+        error: null,
+      }),
+    }));
+    vi.doMock("@xyflow/react", () => ({
+      Handle: () => null,
+      Position: { Left: "left", Right: "right" },
+    }));
+    vi.doMock("convex/react", () => ({
+      useMutation: () => vi.fn(async () => undefined),
+    }));
+    vi.doMock("lucide-react", () => ({
+      AlertCircle: () => null,
+      ArrowDown: () => null,
+      CheckCircle2: () => null,
+      CloudUpload: () => null,
+      Loader2: () => null,
+      Maximize2: () => null,
+      X: () => null,
+    }));
+    vi.doMock("@/components/canvas/nodes/base-node-wrapper", () => ({
+      default: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+    }));
+    vi.doMock("@/components/canvas/nodes/adjustment-controls", () => ({
+      SliderRow: () => null,
+    }));
+    vi.doMock("@/components/ui/select", () => ({
+      Select: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+      SelectContent: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+      SelectItem: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+      SelectTrigger: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+      SelectValue: () => null,
+    }));
+    vi.doMock("@/components/canvas/canvas-sync-context", () => ({
+      useCanvasSync: () => ({
+        queueNodeDataUpdate: vi.fn(async () => undefined),
+        queueNodeResize,
+        status: { isOffline: false },
+      }),
+    }));
+    vi.doMock("@/hooks/use-debounced-callback", () => ({
+      useDebouncedCallback: (callback: () => void) => callback,
+    }));
+    vi.doMock("@/components/canvas/canvas-graph-context", () => ({
+      useCanvasGraph: () => ({
+        nodes: [],
+        edges: [],
+        previewNodeDataOverrides: new Map(),
+      }),
+    }));
+    vi.doMock("@/lib/canvas-render-preview", () => ({
+      resolveRenderPreviewInputFromGraph: () => ({
+        sourceUrl: "https://cdn.example.com/source.png",
+        steps: [
+          {
+            nodeId: "crop-1",
+            type: "crop",
+            params: { cropRect: { x: 0.1, y: 0.1, width: 0.8, height: 0.8 } },
+          },
+        ],
+      }),
+      findSourceNodeFromGraph: () => ({
+        id: "image-1",
+        type: "image",
+        data: { width: 1200, height: 800 },
+      }),
+      shouldFastPathPreviewPipeline: () => false,
+    }));
+    vi.doMock("@/lib/canvas-utils", () => ({
+      resolveMediaAspectRatio: () => null,
+    }));
+    vi.doMock("@/lib/image-formats", () => ({
+      parseAspectRatioString: () => ({ w: 1, h: 1 }),
+    }));
+    vi.doMock("@/lib/image-pipeline/contracts", async () => {
+      const actual = await vi.importActual<typeof import("@/lib/image-pipeline/contracts")>(
+        "@/lib/image-pipeline/contracts",
+      );
+      return {
+        ...actual,
+        hashPipeline: () => "pipeline-hash",
+      };
+    });
+    vi.doMock("@/lib/image-pipeline/worker-client", () => ({
+      isPipelineAbortError: () => false,
+      renderFullWithWorkerFallback: vi.fn(),
+    }));
+    vi.doMock("@/components/ui/dialog", () => ({
+      Dialog: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+      DialogContent: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+      DialogTitle: ({ children }: { children: React.ReactNode }) => createElement("div", null, children),
+    }));
+
+    const renderNodeModule = await import("@/components/canvas/nodes/render-node");
+    const RenderNode = renderNodeModule.default;
+
+    await act(async () => {
+      root?.render(
+        createElement(RenderNode, {
+          id: "render-1",
+          data: {},
+          selected: false,
+          dragging: false,
+          zIndex: 0,
+          isConnectable: true,
+          type: "render",
+          xPos: 0,
+          yPos: 0,
+          width: 450,
+          height: 300,
+          sourcePosition: undefined,
+          targetPosition: undefined,
+          positionAbsoluteX: 0,
+          positionAbsoluteY: 0,
+        } as never),
+      );
+    });
+
+    await act(async () => {
+      await Promise.resolve();
+    });
+
+    expect(queueNodeResize).toHaveBeenCalledWith(
+      expect.objectContaining({
+        nodeId: "render-1",
+        width: 450,
+        height: 450,
+      }),
+    );
+  });
 });