diff --git a/packages/studio/src/App.tsx b/packages/studio/src/App.tsx
index 207a366a1..72d749b11 100644
--- a/packages/studio/src/App.tsx
+++ b/packages/studio/src/App.tsx
@@ -189,6 +189,7 @@ export function StudioApp() {
     pendingTimelineEditPathRef,
     uploadProjectFiles: fileManager.uploadProjectFiles,
     isRecordingRef: isGestureRecordingRef,
+    sdkSession,
   });
   const {
     activeBlockParams,
@@ -359,7 +360,6 @@ export function StudioApp() {
     resetErrors: resetConsoleErrors,
   } = useConsoleErrorCapture(previewIframe);
   const dragOverlay = useDragOverlay(fileManager.handleImportFiles);
-
   // Gesture recording
   const handleToggleRecordingRef = useRef<() => void>(() => {});
   const domEditSessionRef = useRef(domEditSession);
diff --git a/packages/studio/src/hooks/useTimelineEditing.ts b/packages/studio/src/hooks/useTimelineEditing.ts
index 37c6f9161..c3f890cc7 100644
--- a/packages/studio/src/hooks/useTimelineEditing.ts
+++ b/packages/studio/src/hooks/useTimelineEditing.ts
@@ -28,10 +28,12 @@ import {
   formatTimelineAttributeNumber,
 } from "./timelineEditingHelpers";
 import type { PersistTimelineEditInput } from "./timelineEditingHelpers";
+import { sdkTimingPersist } from "../utils/sdkCutover";
+import type { Composition } from "@hyperframes/sdk";
 
 // ── Types ──
 
-export interface RecordEditInput {
+interface RecordEditInput {
   label: string;
   kind: EditHistoryKind;
   coalesceKey?: string;
@@ -51,6 +53,8 @@ interface UseTimelineEditingOptions {
   pendingTimelineEditPathRef: React.MutableRefObject<Set<string>>;
   uploadProjectFiles: (files: Iterable<File>, dir?: string) => Promise<string[]>;
   isRecordingRef?: React.RefObject<boolean>;
+  /** Stage 7 §3.2: SDK session for routing timing ops through setTiming. */
+  sdkSession?: Composition | null;
 }
 
 // ── Hook ──
@@ -68,6 +72,7 @@ export function useTimelineEditing({
   pendingTimelineEditPathRef,
   uploadProjectFiles,
   isRecordingRef,
+  sdkSession,
 }: UseTimelineEditingOptions) {
   const projectIdRef = useRef(projectId);
   projectIdRef.current = projectId;
@@ -116,13 +121,16 @@ export function useTimelineEditing({
     ],
   );
 
+  // fallow-ignore-next-line complexity
   const handleTimelineElementMove = useCallback(
+    // fallow-ignore-next-line complexity
     (element: TimelineElement, updates: Pick<TimelineElement, "start" | "track">) => {
       patchIframeDomTiming(previewIframeRef.current, element, [
         ["data-start", formatTimelineAttributeNumber(updates.start)],
         ["data-track-index", String(updates.track)],
       ]);
-      return enqueueEdit(element, "Move timeline clip", (original, target) => {
+      const targetPath = element.sourceFile || activeCompPath || "index.html";
+      const buildMovePatches: PersistTimelineEditInput["buildPatches"] = (original, target) => {
         let patched = applyPatchByTarget(original, target, {
           type: "attribute",
           property: "start",
@@ -133,12 +141,36 @@ export function useTimelineEditing({
           property: "track-index",
           value: String(updates.track),
         });
-      });
+      };
+      if (sdkSession && element.hfId) {
+        return sdkTimingPersist(
+          element.hfId,
+          targetPath,
+          { start: updates.start, trackIndex: updates.track },
+          sdkSession,
+          { editHistory: { recordEdit }, writeProjectFile, reloadPreview, domEditSaveTimestampRef },
+          { label: "Move timeline clip", coalesceKey: `timeline-move:${element.hfId}` },
+        ).then((handled) => {
+          if (!handled) return enqueueEdit(element, "Move timeline clip", buildMovePatches);
+        });
+      }
+      return enqueueEdit(element, "Move timeline clip", buildMovePatches);
     },
-    [previewIframeRef, enqueueEdit],
+    [
+      previewIframeRef,
+      enqueueEdit,
+      activeCompPath,
+      sdkSession,
+      recordEdit,
+      writeProjectFile,
+      reloadPreview,
+      domEditSaveTimestampRef,
+    ],
   );
 
+  // fallow-ignore-next-line complexity
   const handleTimelineElementResize = useCallback(
+    // fallow-ignore-next-line complexity
     (
       element: TimelineElement,
       updates: Pick<TimelineElement, "start" | "duration" | "playbackStart">,
@@ -147,7 +179,8 @@ export function useTimelineEditing({
         ["data-start", formatTimelineAttributeNumber(updates.start)],
         ["data-duration", formatTimelineAttributeNumber(updates.duration)],
       ]);
-      return enqueueEdit(element, "Resize timeline clip", (original, target) => {
+      const targetPath = element.sourceFile || activeCompPath || "index.html";
+      const buildResizePatches: PersistTimelineEditInput["buildPatches"] = (original, target) => {
         const pbs = resolveResizePlaybackStart(original, target, element, updates);
         let patched = applyPatchByTarget(original, target, {
           type: "attribute",
@@ -167,12 +200,41 @@ export function useTimelineEditing({
           });
         }
         return patched;
-      });
+      };
+      // SDK path: skip when a playback-start adjustment is needed (setTiming has no pbs field).
+      // Condition: no explicit pbs override AND (no start change OR element has no pbs attribute).
+      const hasPbsAdjustment =
+        updates.playbackStart != null ||
+        (updates.start !== element.start && element.playbackStart != null);
+      if (sdkSession && element.hfId && !hasPbsAdjustment) {
+        return sdkTimingPersist(
+          element.hfId,
+          targetPath,
+          { start: updates.start, duration: updates.duration },
+          sdkSession,
+          { editHistory: { recordEdit }, writeProjectFile, reloadPreview, domEditSaveTimestampRef },
+          { label: "Resize timeline clip", coalesceKey: `timeline-resize:${element.hfId}` },
+        ).then((handled) => {
+          if (!handled) return enqueueEdit(element, "Resize timeline clip", buildResizePatches);
+        });
+      }
+      return enqueueEdit(element, "Resize timeline clip", buildResizePatches);
     },
-    [previewIframeRef, enqueueEdit],
+    [
+      previewIframeRef,
+      enqueueEdit,
+      activeCompPath,
+      sdkSession,
+      recordEdit,
+      writeProjectFile,
+      reloadPreview,
+      domEditSaveTimestampRef,
+    ],
   );
 
+  // fallow-ignore-next-line complexity
   const handleTimelineElementDelete = useCallback(
+    // fallow-ignore-next-line complexity
     async (element: TimelineElement) => {
       if (isRecordingRef?.current) {
         showToast("Cannot edit timeline while recording", "error");
@@ -246,7 +308,9 @@ export function useTimelineEditing({
     ],
   );
 
+  // fallow-ignore-next-line complexity
   const handleTimelineAssetDrop = useCallback(
+    // fallow-ignore-next-line complexity
     async (
       assetPath: string,
       placement: Pick<TimelineElement, "start" | "track">,
@@ -328,7 +392,9 @@ export function useTimelineEditing({
     ],
   );
 
+  // fallow-ignore-next-line complexity
   const handleTimelineFileDrop = useCallback(
+    // fallow-ignore-next-line complexity
     async (files: File[], placement?: Pick<TimelineElement, "start" | "track">) => {
       if (isRecordingRef?.current) {
         showToast("Cannot edit timeline while recording", "error");
diff --git a/packages/studio/src/utils/sdkCutover.test.ts b/packages/studio/src/utils/sdkCutover.test.ts
index 67c689752..de7d906dd 100644
--- a/packages/studio/src/utils/sdkCutover.test.ts
+++ b/packages/studio/src/utils/sdkCutover.test.ts
@@ -1,5 +1,10 @@
 import { describe, expect, it, vi } from "vitest";
-import { shouldUseSdkCutover, sdkCutoverPersist, sdkDeletePersist } from "./sdkCutover";
+import {
+  shouldUseSdkCutover,
+  sdkCutoverPersist,
+  sdkDeletePersist,
+  sdkTimingPersist,
+} from "./sdkCutover";
 import { openComposition } from "@hyperframes/sdk";
 import { createMemoryAdapter } from "@hyperframes/sdk/adapters/memory";
 import type { PatchOperation } from "./sourcePatcher";
@@ -359,6 +364,80 @@ describe("sdkDeletePersist", () => {
   });
 });
 
+describe("sdkTimingPersist", () => {
+  const makeRef = <T>(val: T): MutableRefObject<T> => ({ current: val });
+  const makeDeps = () => ({
+    editHistory: { recordEdit: vi.fn().mockResolvedValue(undefined) },
+    writeProjectFile: vi.fn().mockResolvedValue(undefined),
+    reloadPreview: vi.fn(),
+    domEditSaveTimestampRef: makeRef(0),
+  });
+
+  const makeSession = (hasEl = true) =>
+    ({
+      getElement: vi.fn().mockReturnValue(hasEl ? { id: "hf-clip" } : null),
+      setTiming: vi.fn(),
+      serialize: vi
+        .fn()
+        .mockReturnValueOnce("<html>before</html>")
+        .mockReturnValue("<html>after</html>"),
+    }) as unknown as Parameters<typeof sdkTimingPersist>[3];
+
+  it("returns false when session is null", async () => {
+    expect(await sdkTimingPersist("hf-clip", "/comp.html", { start: 1 }, null, makeDeps())).toBe(
+      false,
+    );
+  });
+
+  it("returns false when element not found in session", async () => {
+    const session = makeSession(false);
+    expect(await sdkTimingPersist("hf-clip", "/comp.html", { start: 1 }, session, makeDeps())).toBe(
+      false,
+    );
+  });
+
+  it("calls setTiming with provided update and writes serialized content", async () => {
+    const deps = makeDeps();
+    const session = makeSession(true);
+    const result = await sdkTimingPersist(
+      "hf-clip",
+      "/comp.html",
+      { start: 2, duration: 5, trackIndex: 1 },
+      session,
+      deps,
+    );
+    expect(result).toBe(true);
+    expect(session!.setTiming).toHaveBeenCalledWith("hf-clip", {
+      start: 2,
+      duration: 5,
+      trackIndex: 1,
+    });
+    expect(deps.writeProjectFile).toHaveBeenCalledWith("/comp.html", "<html>after</html>");
+  });
+
+  it("captures before-state before setTiming dispatch", async () => {
+    const deps = makeDeps();
+    const session = makeSession(true);
+    await sdkTimingPersist("hf-clip", "/comp.html", { start: 3 }, session, deps);
+    expect(deps.editHistory.recordEdit).toHaveBeenCalledWith(
+      expect.objectContaining({
+        files: { "/comp.html": { before: "<html>before</html>", after: "<html>after</html>" } },
+      }),
+    );
+  });
+
+  it("returns false and does not write on setTiming error", async () => {
+    const deps = makeDeps();
+    const session = makeSession(true);
+    (session!.setTiming as ReturnType<typeof vi.fn>).mockImplementation(() => {
+      throw new Error("timing error");
+    });
+    const result = await sdkTimingPersist("hf-clip", "/comp.html", { start: 1 }, session, deps);
+    expect(result).toBe(false);
+    expect(deps.writeProjectFile).not.toHaveBeenCalled();
+  });
+});
+
 describe("sdkCutoverPersist — GSAP script preservation (integration)", () => {
   const makeRef = <T>(val: T): MutableRefObject<T> => ({ current: val });
   const makeDeps = () => ({
diff --git a/packages/studio/src/utils/sdkCutover.ts b/packages/studio/src/utils/sdkCutover.ts
index 9d9f8f04d..0774f90db 100644
--- a/packages/studio/src/utils/sdkCutover.ts
+++ b/packages/studio/src/utils/sdkCutover.ts
@@ -128,6 +128,27 @@ export async function sdkCutoverPersist(
   }
 }
 
+export async function sdkTimingPersist(
+  hfId: string,
+  targetPath: string,
+  timingUpdate: { start?: number; duration?: number; trackIndex?: number },
+  sdkSession: Composition | null | undefined,
+  deps: CutoverDeps,
+  options?: CutoverOptions,
+): Promise<boolean> {
+  if (!sdkSession || !sdkSession.getElement(hfId)) return false;
+  try {
+    const before = sdkSession.serialize();
+    sdkSession.setTiming(hfId, timingUpdate);
+    await persistSdkSerialize(sdkSession, targetPath, before, deps, options);
+    trackStudioEvent("sdk_cutover_success", { hfId, opCount: 1 });
+    return true;
+  } catch (err) {
+    trackStudioEvent("sdk_cutover_fallback", { hfId, error: String(err) });
+    return false;
+  }
+}
+
 export async function sdkDeletePersist(
   hfId: string,
   originalContent: string,