From 8aca1d8d7f59d2dab704abcc10bd69a5b8c9f323 Mon Sep 17 00:00:00 2001
From: Martin Meredith <martin@sourceguru.net>
Date: Tue, 10 Nov 2026 14:16:59 +0000
Subject: [PATCH] fix(web,mobile): thread-bound scheduled tasks no longer offer
 a model their runs ignore

A scheduled task bound to a thread runs on that thread's current model.
The saved selection only seeds new threads, but the editor's Model field
stayed editable, so a change saved and then did nothing. The field is now
disabled while the draft is bound, with a note saying runs use the
thread's model. Unbinding enables it again.

Co-Authored-By: Claude <noreply@anthropic.com>
---
 .../SettingsScheduledTasksRouteScreen.tsx        |  9 +++++++--
 .../ScheduledTasksSettings.browser.test.tsx      | 16 ++++++++++++++++
 .../settings/ScheduledTasksSettings.tsx          |  5 ++++-
 3 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx b/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx
index ef4b696c82ec8..7db9d48e6da4a 100644
--- a/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx
+++ b/apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx
@@ -858,7 +858,10 @@ function TaskForm({
           {promptField}
         </SettingsSection>
 
-        <SettingsSection title="Context">
+        <SettingsSection
+          title="Context"
+          footer={draft.threadId !== null ? "Runs use this thread's current model." : undefined}
+        >
           <SelectRow
             label="Project"
             value={
@@ -904,7 +907,9 @@ function TaskForm({
               (modelOptions.length ? "Choose model" : "No models available")
             }
             onPress={() => navigation.navigate("SettingsScheduledTaskModel")}
-            disabled={saving || dictationPending || environmentUnavailable}
+            disabled={
+              saving || dictationPending || environmentUnavailable || draft.threadId !== null
+            }
           />
         </SettingsSection>
 
diff --git a/apps/web/src/components/settings/ScheduledTasksSettings.browser.test.tsx b/apps/web/src/components/settings/ScheduledTasksSettings.browser.test.tsx
index ca8192dd894e3..59019fe85bccd 100644
--- a/apps/web/src/components/settings/ScheduledTasksSettings.browser.test.tsx
+++ b/apps/web/src/components/settings/ScheduledTasksSettings.browser.test.tsx
@@ -215,4 +215,20 @@ describe("ScheduledTasksSettings", () => {
     await expect.element(dialog.getByRole("heading", { name: "New task" })).toBeInTheDocument();
     await expect.element(name).toHaveValue("My draft");
   });
+
+  it("locks the model while the task is bound to a thread", async () => {
+    setup();
+    await using _screen = await render(<ScheduledTasksSettings taskId={task.id} />);
+    const dialog = page.getByRole("dialog");
+    const model = dialog.getByRole("button", { name: "Choose model" });
+    const note = dialog.getByText("Runs use this thread's current model.");
+    await expect.element(model).toBeDisabled();
+    await expect.element(note).toBeVisible();
+
+    await userEvent.click(dialog.getByRole("combobox", { name: "Destination" }));
+    await userEvent.click(page.getByRole("option", { name: "New thread each run" }));
+
+    await expect.element(model).toBeEnabled();
+    await expect.element(note).not.toBeInTheDocument();
+  });
 });
diff --git a/apps/web/src/components/settings/ScheduledTasksSettings.tsx b/apps/web/src/components/settings/ScheduledTasksSettings.tsx
index ff024e5ba2ed2..412bc9a43be47 100644
--- a/apps/web/src/components/settings/ScheduledTasksSettings.tsx
+++ b/apps/web/src/components/settings/ScheduledTasksSettings.tsx
@@ -1786,7 +1786,7 @@ function ScheduledTaskEditorForm({
             <div>
               <ProviderModelPicker
                 environmentId={environmentId}
-                disabled={saving || !connected}
+                disabled={saving || !connected || draft.threadId !== ""}
                 activeInstanceId={activeInstanceId}
                 model={activeModel}
                 lockedProvider={null}
@@ -1799,6 +1799,9 @@ function ScheduledTaskEditorForm({
                 }
               />
             </div>
+            {draft.threadId !== "" ? (
+              <p className="text-sm text-muted-foreground">Runs use this thread's current model.</p>
+            ) : null}
           </Field>
 
           <div className="space-y-3">