diff --git a/apps/web/src/components/CommandPalette.browser.test.tsx b/apps/web/src/components/CommandPalette.browser.test.tsx
index 3883a3e2258e9..9faeab83c6ffc 100644
--- a/apps/web/src/components/CommandPalette.browser.test.tsx
+++ b/apps/web/src/components/CommandPalette.browser.test.tsx
@@ -1,13 +1,28 @@
-import { describe, expect, it } from "vite-plus/test";
+import { EnvironmentId, ProjectId, ThreadId } from "@t3tools/contracts";
+import { describe, expect, it, vi } from "vite-plus/test";
 import { page } from "vite-plus/test/browser";
 
 import { render } from "../../test/render";
 import { openCommandPalette } from "../commandPaletteBus";
 import { useCommandPaletteStore } from "../commandPaletteStore";
+import { makeThreadFixture } from "../test-fixtures";
+import type { Project, Thread } from "../types";
 import { CommandPalette } from "./CommandPalette";
 
-function setup() {
+const entities = vi.hoisted(() => ({
+  projects: [] as ReadonlyArray<Project>,
+  threads: [] as ReadonlyArray<Thread>,
+}));
+vi.mock("../state/entities", async (original) => ({
+  ...(await original<typeof import("../state/entities")>()),
+  useProjects: () => entities.projects,
+  useVisibleThreadShells: () => entities.threads,
+}));
+
+function setup(state: { projects?: ReadonlyArray<Project>; threads?: ReadonlyArray<Thread> } = {}) {
   useCommandPaletteStore.setState(useCommandPaletteStore.getInitialState(), true);
+  entities.projects = state.projects ?? [];
+  entities.threads = state.threads ?? [];
 }
 
 describe("CommandPalette open intents", () => {
@@ -30,4 +45,50 @@ describe("CommandPalette open intents", () => {
     await expect.element(input).toHaveFocus();
     await expect.element(input).toHaveValue("acme");
   });
+
+  it("opens a searched project's latest listed thread, not a newer subagent", async () => {
+    const environmentId = EnvironmentId.make("local");
+    const projectId = ProjectId.make("acme");
+    const parentId = ThreadId.make("parent");
+    setup({
+      projects: [
+        {
+          id: projectId,
+          environmentId,
+          title: "Acme",
+          workspaceRoot: "/work/acme",
+          repositoryIdentity: null,
+          defaultModelSelection: null,
+          createdAt: "2026-03-01T00:00:00.000Z",
+          updatedAt: "2026-03-01T00:00:00.000Z",
+          scripts: [],
+        },
+      ],
+      threads: [
+        makeThreadFixture({
+          id: parentId,
+          environmentId,
+          projectId,
+          latestUserMessageAt: "2026-03-02T00:00:00.000Z",
+        }),
+        makeThreadFixture({
+          id: ThreadId.make("subagent"),
+          environmentId,
+          projectId,
+          updatedAt: "2026-03-03T00:00:00.000Z",
+          lineage: {
+            rootThreadId: parentId,
+            parentThreadId: parentId,
+            relationshipToParent: "subagent",
+          },
+        }),
+      ],
+    });
+    await using screen = await render(<CommandPalette>{null}</CommandPalette>);
+
+    openCommandPalette({ query: "Acme" });
+    await page.getByRole("option", { name: /Acme/ }).first().click();
+
+    await vi.waitFor(() => expect(screen.router?.state.location.pathname).toBe("/local/parent"));
+  });
 });
diff --git a/apps/web/src/components/CommandPalette.tsx b/apps/web/src/components/CommandPalette.tsx
index 068808707b4f5..ddac4fc4d7c17 100644
--- a/apps/web/src/components/CommandPalette.tsx
+++ b/apps/web/src/components/CommandPalette.tsx
@@ -212,6 +212,7 @@ import {
   type SearchOverlayMode,
 } from "./CommandPalette.logic";
 import { resolveEnvironmentOptionLabel } from "./BranchToolbar.logic";
+import { isSidebarHiddenThread } from "./Sidebar.logic";
 import { CommandPaletteContent } from "./CommandPaletteContent";
 import {
   selectCommandPaletteClientSettings,
@@ -493,7 +494,8 @@ function OpenCommandPaletteDialog(props: {
     if (activeThreadReferenceCopyTarget === null) return;
     await copyThreadReference(activeThreadReferenceCopyTarget);
   };
-  const threads = useVisibleThreadShells();
+  // Side chats and subagents open inside their parent, so opening a project never lands on one.
+  const threads = useVisibleThreadShells().filter((thread) => !isSidebarHiddenThread(thread));
   const keybindings = useAtomValue(primaryServerKeybindingsAtom);
   const providersByEnvironment = useEnvironmentProviders();
   const { changeThemeItem, changeAppearanceItem, themeEditorItem } = useCommandPaletteThemeItems();