diff --git a/apps/web/src/components/Sidebar.logic.test.ts b/apps/web/src/components/Sidebar.logic.test.ts
index bf3d37d0edc2..3cbce4a7b70c 100644
--- a/apps/web/src/components/Sidebar.logic.test.ts
+++ b/apps/web/src/components/Sidebar.logic.test.ts
@@ -13,7 +13,6 @@ import {
   resolveAdjacentThreadId,
   reduceSidebarProjectScopeMenuState,
   getFallbackThreadIdAfterDelete,
-  getVisibleThreadsForProject,
   getProjectSortTimestamp,
   hasUnseenCompletion,
   isContextMenuPointerDown,
@@ -1362,57 +1361,6 @@ describe("resolveProjectStatusIndicator", () => {
   });
 });
 
-describe("getVisibleThreadsForProject", () => {
-  it("includes the active thread even when it falls below the folded preview", () => {
-    const threads = Array.from({ length: 8 }, (_, index) =>
-      makeThread({
-        id: ThreadId.make(`thread-${index + 1}`),
-        title: `Thread ${index + 1}`,
-      }),
-    );
-
-    const result = getVisibleThreadsForProject({
-      threads,
-      activeThreadId: ThreadId.make("thread-8"),
-      isThreadListExpanded: false,
-      previewLimit: 6,
-    });
-
-    expect(result.hasHiddenThreads).toBe(true);
-    expect(result.visibleThreads.map((thread) => thread.id)).toEqual([
-      ThreadId.make("thread-1"),
-      ThreadId.make("thread-2"),
-      ThreadId.make("thread-3"),
-      ThreadId.make("thread-4"),
-      ThreadId.make("thread-5"),
-      ThreadId.make("thread-6"),
-      ThreadId.make("thread-8"),
-    ]);
-    expect(result.hiddenThreads.map((thread) => thread.id)).toEqual([ThreadId.make("thread-7")]);
-  });
-
-  it("returns all threads when the list is expanded", () => {
-    const threads = Array.from({ length: 8 }, (_, index) =>
-      makeThread({
-        id: ThreadId.make(`thread-${index + 1}`),
-      }),
-    );
-
-    const result = getVisibleThreadsForProject({
-      threads,
-      activeThreadId: ThreadId.make("thread-8"),
-      isThreadListExpanded: true,
-      previewLimit: 6,
-    });
-
-    expect(result.hasHiddenThreads).toBe(true);
-    expect(result.visibleThreads.map((thread) => thread.id)).toEqual(
-      threads.map((thread) => thread.id),
-    );
-    expect(result.hiddenThreads).toEqual([]);
-  });
-});
-
 function makeProject(overrides: Partial<Project> = {}): Project {
   const { defaultModelSelection, ...rest } = overrides;
   return {
diff --git a/apps/web/src/components/Sidebar.logic.ts b/apps/web/src/components/Sidebar.logic.ts
index 8e88aea37f4c..d83457555f5c 100644
--- a/apps/web/src/components/Sidebar.logic.ts
+++ b/apps/web/src/components/Sidebar.logic.ts
@@ -838,54 +838,6 @@ export function resolveProjectStatusIndicator(
   return highestPriorityStatus;
 }
 
-export function getVisibleThreadsForProject<T extends Pick<Thread, "id">>(input: {
-  threads: readonly T[];
-  activeThreadId: T["id"] | undefined;
-  isThreadListExpanded: boolean;
-  previewLimit: number;
-}): {
-  hasHiddenThreads: boolean;
-  visibleThreads: T[];
-  hiddenThreads: T[];
-} {
-  const { activeThreadId, isThreadListExpanded, previewLimit, threads } = input;
-  const hasHiddenThreads = threads.length > previewLimit;
-
-  if (!hasHiddenThreads || isThreadListExpanded) {
-    return {
-      hasHiddenThreads,
-      hiddenThreads: [],
-      visibleThreads: [...threads],
-    };
-  }
-
-  const previewThreads = threads.slice(0, previewLimit);
-  if (!activeThreadId || previewThreads.some((thread) => thread.id === activeThreadId)) {
-    return {
-      hasHiddenThreads: true,
-      hiddenThreads: threads.slice(previewLimit),
-      visibleThreads: previewThreads,
-    };
-  }
-
-  const activeThread = threads.find((thread) => thread.id === activeThreadId);
-  if (!activeThread) {
-    return {
-      hasHiddenThreads: true,
-      hiddenThreads: threads.slice(previewLimit),
-      visibleThreads: previewThreads,
-    };
-  }
-
-  const visibleThreadIds = new Set([...previewThreads, activeThread].map((thread) => thread.id));
-
-  return {
-    hasHiddenThreads: true,
-    hiddenThreads: threads.filter((thread) => !visibleThreadIds.has(thread.id)),
-    visibleThreads: threads.filter((thread) => visibleThreadIds.has(thread.id)),
-  };
-}
-
 export function getFallbackThreadIdAfterDelete<
   T extends Pick<Thread, "id" | "projectId" | "createdAt" | "updatedAt"> & ThreadSortInput,
 >(input: {