fix(site): improve Workspace Autostop Fallback UX on agents settings page (#23465)

https://github.com/user-attachments/assets/a482ef45-402a-4d86-af59-b1526b2ce3e2

## Summary

Redesigns the **Default Autostop** section on the `/agents` settings
page to clarify that it is a fallback for chat-linked workspaces whose
templates do not define their own autostop policy. Template-level
settings always take priority — this is a backstop, not an override.

## Changes

### UX
- Renamed to **Workspace Autostop Fallback** with clearer description
- Replaced always-visible duration field (confusing `0` in an hours box)
with a **toggle-to-enable** pattern matching the Virtual Desktop section
- Toggle ON auto-saves with a 1-hour default; toggle OFF auto-saves with
0
- Save button is always visible when the toggle is on but disabled until
the user changes the duration value
- Per-section disabled flags — toggling autostop no longer freezes the
Virtual Desktop switch or prompt textareas during the save round-trip

### Reliability
- `onError` rollback on toggle auto-saves so the UI snaps back to server
truth on failure
- Stateful mocks in Storybook stories to prevent race conditions from
instant mock resolution

### Accessibility
- Added `aria-label="Autostop duration"` to the DurationField input
- Updated `DurationField` component to merge external `inputProps` with
internal ones (preserves `step: 1`)

### Stories
- Updated all existing autostop stories for the new toggle-based flow
- Added `DefaultAutostopToggleOff` — tests disabling from an enabled
state
- Added `DefaultAutostopSaveDisabled` — verifies Save button is visible
but disabled when no duration change

---

PR generated with Coder Agents

site/src/pages/AgentsPage/AgentSettingsPageView.stories.tsx

@@ -210,20 +210,20 @@ export const DefaultAutostopDefault: Story = {
 	play: async ({ canvasElement }) => {
 		const canvas = within(canvasElement);
 
-		await canvas.findByText("Default Autostop");
-		// When disabled (0s), shows template-default copy.
-		await canvas.findByText(/stopped as configured by their templates/i);
+		await canvas.findByText("Workspace Autostop Fallback");
+		// Description is always visible.
+		await canvas.findByText(
+			/set a default autostop for agent-created workspaces/i,
+		);
 
-		// DurationField renders a text input labeled "Default autostop".
-		const durationInput = await canvas.findByLabelText("Default autostop");
+		// Toggle should be OFF when TTL is 0.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		expect(toggle).not.toBeChecked();
 
-		// Default is "0s" → 0 hours (disabled).
-		expect(durationInput).toHaveValue("0");
-
-		// Save button should be disabled (no local change).
-		const ttlForm = durationInput.closest("form")!;
-		const saveButton = within(ttlForm).getByRole("button", { name: "Save" });
-		expect(saveButton).toBeDisabled();
+		// Duration field should not be visible when disabled.
+		expect(canvas.queryByLabelText("Autostop Fallback")).toBeNull();
 	},
 };
 
@@ -237,29 +237,54 @@ export const DefaultAutostopCustomValue: Story = {
 	play: async ({ canvasElement }) => {
 		const canvas = within(canvasElement);
 
-		const durationInput = await canvas.findByLabelText("Default autostop");
+		// Toggle should be ON when TTL > 0.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		expect(toggle).toBeChecked();
 
-		// Shows 2 hours from the mock.
+		// Duration field should be visible with 2 hours.
+		const durationInput = await canvas.findByLabelText("Autostop Fallback");
 		expect(durationInput).toHaveValue("2");
-
-		// When non-zero, shows the duration in the description.
-		await canvas.findByText(/stopped after 2 hours of inactivity/i);
 	},
 };
 
 export const DefaultAutostopSave: Story = {
+	beforeEach: () => {
+		let currentTTL = 0;
+		spyOn(API.experimental, "getChatWorkspaceTTL").mockImplementation(
+			async () => ({ workspace_ttl_ms: currentTTL }),
+		);
+		spyOn(API.experimental, "updateChatWorkspaceTTL").mockImplementation(
+			async (req) => {
+				currentTTL = req.workspace_ttl_ms;
+			},
+		);
+	},
 	play: async ({ canvasElement }) => {
 		const canvas = within(canvasElement);
 
-		const durationInput = await canvas.findByLabelText("Default autostop");
-		const ttlForm = durationInput.closest("form")!;
-		const saveButton = within(ttlForm).getByRole("button", { name: "Save" });
+		// Toggle ON — should auto-save with 1-hour default.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		await userEvent.click(toggle);
 
-		// Change to 3 hours.
+		await waitFor(() => {
+			expect(API.experimental.updateChatWorkspaceTTL).toHaveBeenCalledWith({
+				workspace_ttl_ms: 3_600_000,
+			});
+		});
+
+		const durationInput = await canvas.findByLabelText("Autostop Fallback");
+		expect(durationInput).toHaveValue("1");
+
+		// Change to 3 hours — Save button should appear.
 		await userEvent.clear(durationInput);
 		await userEvent.type(durationInput, "3");
 
-		// Save button should now be enabled.
+		const ttlForm = durationInput.closest("form")!;
+		const saveButton = within(ttlForm).getByRole("button", { name: "Save" });
 		await waitFor(() => {
 			expect(saveButton).toBeEnabled();
 		});
@@ -270,16 +295,39 @@ export const DefaultAutostopSave: Story = {
 				workspace_ttl_ms: 10_800_000,
 			});
 		});
+
+		// Verify the isTTLZero guard: clearing to 0 should disable Save
+		// because the toggle is still ON.
+		await userEvent.clear(durationInput);
+		await waitFor(() => {
+			expect(saveButton).toBeDisabled();
+		});
 	},
 };
 
 export const DefaultAutostopExceedsMax: Story = {
+	beforeEach: () => {
+		let currentTTL = 0;
+		spyOn(API.experimental, "getChatWorkspaceTTL").mockImplementation(
+			async () => ({ workspace_ttl_ms: currentTTL }),
+		);
+		spyOn(API.experimental, "updateChatWorkspaceTTL").mockImplementation(
+			async (req) => {
+				currentTTL = req.workspace_ttl_ms;
+			},
+		);
+	},
 	play: async ({ canvasElement }) => {
 		const canvas = within(canvasElement);
 
-		const durationInput = await canvas.findByLabelText("Default autostop");
+		// Toggle ON to reveal the duration field.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		await userEvent.click(toggle);
+
+		const durationInput = await canvas.findByLabelText("Autostop Fallback");
 		const ttlForm = durationInput.closest("form")!;
-		const saveButton = within(ttlForm).getByRole("button", { name: "Save" });
 
 		// Enter 721 hours (exceeds 30-day / 720h limit).
 		await userEvent.clear(durationInput);
@@ -291,10 +339,164 @@ export const DefaultAutostopExceedsMax: Story = {
 		});
 
 		// Save button should be disabled despite the field being dirty.
+		const saveButton = within(ttlForm).getByRole("button", { name: "Save" });
 		expect(saveButton).toBeDisabled();
 	},
 };
 
+export const DefaultAutostopToggleOff: Story = {
+	beforeEach: () => {
+		let currentTTL = 7_200_000;
+		spyOn(API.experimental, "getChatWorkspaceTTL").mockImplementation(
+			async () => ({ workspace_ttl_ms: currentTTL }),
+		);
+		spyOn(API.experimental, "updateChatWorkspaceTTL").mockImplementation(
+			async (req) => {
+				currentTTL = req.workspace_ttl_ms;
+			},
+		);
+	},
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+
+		// Toggle should start ON since TTL > 0.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		expect(toggle).toBeChecked();
+
+		// Click toggle OFF.
+		await userEvent.click(toggle);
+
+		await waitFor(() => {
+			expect(API.experimental.updateChatWorkspaceTTL).toHaveBeenCalledWith({
+				workspace_ttl_ms: 0,
+			});
+		});
+
+		// Duration field should no longer be visible.
+		await waitFor(() => {
+			expect(canvas.queryByLabelText("Autostop Fallback")).toBeNull();
+		});
+	},
+};
+
+export const DefaultAutostopSaveDisabled: Story = {
+	beforeEach: () => {
+		spyOn(API.experimental, "getChatWorkspaceTTL").mockResolvedValue({
+			workspace_ttl_ms: 7_200_000,
+		});
+	},
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+
+		// Toggle should be ON since TTL > 0.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		expect(toggle).toBeChecked();
+
+		// Duration field should show 2 hours.
+		const durationInput = await canvas.findByLabelText("Autostop Fallback");
+		expect(durationInput).toHaveValue("2");
+
+		// Save button should exist but be disabled (no changes made).
+		const ttlForm = durationInput.closest("form")!;
+		const saveButton = within(ttlForm).getByRole("button", { name: "Save" });
+		expect(saveButton).toBeDisabled();
+	},
+};
+
+export const DefaultAutostopToggleFailure: Story = {
+	beforeEach: () => {
+		spyOn(API.experimental, "getChatWorkspaceTTL").mockResolvedValue({
+			workspace_ttl_ms: 0,
+		});
+		spyOn(API.experimental, "updateChatWorkspaceTTL").mockRejectedValue(
+			new Error("Server error"),
+		);
+	},
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+
+		// Toggle starts OFF since TTL is 0.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		expect(toggle).not.toBeChecked();
+
+		// Click toggle ON.
+		await userEvent.click(toggle);
+
+		// Verify the mutation was called with the 1-hour default.
+		await waitFor(() => {
+			expect(API.experimental.updateChatWorkspaceTTL).toHaveBeenCalledWith({
+				workspace_ttl_ms: 3_600_000,
+			});
+		});
+
+		// The onError handler resets state, reverting the toggle.
+		await waitFor(() => {
+			expect(toggle).not.toBeChecked();
+		});
+
+		// Error message should be visible.
+		expect(
+			canvas.getByText("Failed to save autostop setting."),
+		).toBeInTheDocument();
+
+		// DurationField should not be visible since toggle reverted to OFF.
+		expect(canvas.queryByLabelText("Autostop Fallback")).toBeNull();
+	},
+};
+
+export const DefaultAutostopToggleOffFailure: Story = {
+	beforeEach: () => {
+		spyOn(API.experimental, "getChatWorkspaceTTL").mockResolvedValue({
+			workspace_ttl_ms: 7_200_000,
+		});
+		spyOn(API.experimental, "updateChatWorkspaceTTL").mockRejectedValue(
+			new Error("Server error"),
+		);
+	},
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+
+		// Toggle starts ON since TTL > 0.
+		const toggle = await canvas.findByRole("switch", {
+			name: "Enable default autostop",
+		});
+		expect(toggle).toBeChecked();
+
+		// Duration should show 2 hours initially.
+		const durationInput = await canvas.findByLabelText("Autostop Fallback");
+		expect(durationInput).toHaveValue("2");
+
+		// Click toggle OFF.
+		await userEvent.click(toggle);
+
+		// Verify the mutation was called with 0 to disable.
+		await waitFor(() => {
+			expect(API.experimental.updateChatWorkspaceTTL).toHaveBeenCalledWith({
+				workspace_ttl_ms: 0,
+			});
+		});
+
+		// The onError handler resets state, reverting the toggle to ON.
+		await waitFor(() => {
+			expect(toggle).toBeChecked();
+		});
+
+		// Error message should be visible.
+		expect(
+			canvas.getByText("Failed to save autostop setting."),
+		).toBeInTheDocument();
+
+		// DurationField should still be visible with 2 hours.
+		expect(canvas.getByLabelText("Autostop Fallback")).toHaveValue("2");
+	},
+};
+
 export const DefaultAutostopNotVisibleToNonAdmin: Story = {
 	args: {
 		canSetSystemPrompt: false,
@@ -306,7 +508,7 @@ export const DefaultAutostopNotVisibleToNonAdmin: Story = {
 		await canvas.findByText("Personal Instructions");
 
 		// Admin-only sections should not be present.
-		const ttlHeading = canvas.queryByText("Default Autostop");
+		const ttlHeading = canvas.queryByText("Workspace Autostop Fallback");
 		expect(ttlHeading).toBeNull();
 
 		const desktopHeading = canvas.queryByText("Virtual Desktop");

site/src/pages/AgentsPage/AgentSettingsPageView.tsx

@@ -52,7 +52,6 @@ import { useSearchParams } from "react-router";
 import TextareaAutosize from "react-textarea-autosize";
 import { formatTokenCount } from "utils/analytics";
 import { formatCostMicros } from "utils/currency";
-import { humanDuration } from "utils/time";
 import {
 	DateRange,
 	type DateRangeValue,
@@ -552,15 +551,16 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 	const desktopEnabled = desktopEnabledQuery.data?.enable_desktop ?? false;
 	const serverTTLMs = workspaceTTLQuery.data?.workspace_ttl_ms ?? 0;
 	const [localTTLMs, setLocalTTLMs] = useState<number | null>(null);
+	const [autostopToggled, setAutostopToggled] = useState<boolean | null>(null);
 	const ttlMs = localTTLMs ?? serverTTLMs;
+	const isAutostopEnabled = autostopToggled ?? serverTTLMs > 0;
 	const isTTLDirty = localTTLMs !== null && localTTLMs !== serverTTLMs;
 	const maxTTLMs = 30 * 24 * 60 * 60_000; // 30 days
 	const isTTLOverMax = ttlMs > maxTTLMs;
-	const isDisabled =
-		isSavingSystemPrompt ||
-		isSavingUserPrompt ||
-		isSavingDesktopEnabled ||
-		isSavingWorkspaceTTL;
+	const isTTLZero = isAutostopEnabled && ttlMs === 0;
+	const isPromptSaving = isSavingSystemPrompt || isSavingUserPrompt;
+	const isDesktopSaving = isSavingDesktopEnabled;
+	const isTTLSaving = isSavingWorkspaceTTL;
 	const isTTLLoading = workspaceTTLQuery.isLoading;
 
 	const handleSaveSystemPrompt = (event: FormEvent) => {
@@ -581,12 +581,41 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 		);
 	};
 
+	const resetAutostopState = () => {
+		setLocalTTLMs(null);
+		setAutostopToggled(null);
+	};
+
+	const handleToggleAutostop = (checked: boolean) => {
+		if (checked) {
+			// Defensive: restore server value if query cache is
+			// stale; otherwise default to 1 hour.
+			const defaultTTL = serverTTLMs > 0 ? serverTTLMs : 3_600_000;
+			setAutostopToggled(true);
+			setLocalTTLMs(defaultTTL);
+			saveWorkspaceTTL(
+				{ workspace_ttl_ms: defaultTTL },
+				{ onSuccess: resetAutostopState, onError: resetAutostopState },
+			);
+		} else {
+			setAutostopToggled(false);
+			setLocalTTLMs(0);
+			saveWorkspaceTTL(
+				{ workspace_ttl_ms: 0 },
+				{ onSuccess: resetAutostopState, onError: resetAutostopState },
+			);
+		}
+	};
+
 	const handleSaveChatWorkspaceTTL = (event: FormEvent) => {
 		event.preventDefault();
-		if (!isTTLDirty) return;
+		if (!isTTLDirty || isTTLSaving) return;
 		saveWorkspaceTTL(
 			{ workspace_ttl_ms: localTTLMs ?? 0 },
-			{ onSuccess: () => setLocalTTLMs(null) },
+			{
+				onSuccess: resetAutostopState,
+				onError: () => setAutostopToggled(null),
+			},
 		);
 	};
 	return (
@@ -614,7 +643,7 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 								placeholder="Additional behavior, style, and tone preferences"
 								value={userPromptDraft}
 								onChange={(event) => setLocalUserEdit(event.target.value)}
-								disabled={isDisabled}
+								disabled={isPromptSaving}
 								minRows={1}
 							/>
 							<div className="flex justify-end gap-2">
@@ -623,14 +652,14 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 									variant="outline"
 									type="button"
 									onClick={() => setLocalUserEdit("")}
-									disabled={isDisabled || !userPromptDraft}
+									disabled={isPromptSaving || !userPromptDraft}
 								>
 									Clear
 								</Button>
 								<Button
 									size="sm"
 									type="submit"
-									disabled={isDisabled || !isUserPromptDirty}
+									disabled={isPromptSaving || !isUserPromptDirty}
 								>
 									Save
 								</Button>
@@ -672,7 +701,7 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 										placeholder="Additional behavior, style, and tone preferences for all users"
 										value={systemPromptDraft}
 										onChange={(event) => setLocalEdit(event.target.value)}
-										disabled={isDisabled}
+										disabled={isPromptSaving}
 										minRows={1}
 									/>
 									<div className="flex justify-end gap-2">
@@ -681,14 +710,14 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 											variant="outline"
 											type="button"
 											onClick={() => setLocalEdit("")}
-											disabled={isDisabled || !systemPromptDraft}
+											disabled={isPromptSaving || !systemPromptDraft}
 										>
 											Clear
 										</Button>
 										<Button
 											size="sm"
 											type="submit"
-											disabled={isDisabled || !isSystemPromptDirty}
+											disabled={isPromptSaving || !isSystemPromptDirty}
 										>
 											Save
 										</Button>
@@ -733,7 +762,7 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 												saveDesktopEnabled({ enable_desktop: checked })
 											}
 											aria-label="Enable"
-											disabled={isDisabled}
+											disabled={isDesktopSaving}
 										/>
 									</div>
 									{isSaveDesktopEnabledError && (
@@ -749,36 +778,63 @@ export const AgentSettingsPageView: FC<AgentSettingsPageViewProps> = ({
 								>
 									<div className="flex items-center gap-2">
 										<h3 className="m-0 text-[13px] font-semibold text-content-primary">
-											Default Autostop
+											Workspace Autostop Fallback
 										</h3>
 										<AdminBadge />
 									</div>
-									<p className="!mt-0.5 m-0 text-xs text-content-secondary">
-										{ttlMs === 0
-											? "Workspaces linked to chats will be stopped as configured by their templates. Active chats continuously extend the deadline."
-											: `Workspaces linked to chats will be stopped after ${humanDuration(ttlMs)} of inactivity. Active chats continuously extend the deadline.`}
-									</p>
-									<DurationField
-										label="Default autostop"
-										valueMs={ttlMs}
-										onChange={(v) => setLocalTTLMs(v)}
-										disabled={isDisabled || isTTLLoading}
-										error={isTTLOverMax}
-										helperText={
-											isTTLOverMax
-												? "Must not exceed 30 days (720 hours)."
-												: undefined
-										}
-									/>
-									<div className="flex justify-end">
-										<Button
-											size="sm"
-											type="submit"
-											disabled={isDisabled || !isTTLDirty || isTTLOverMax}
-										>
-											Save
-										</Button>
+									<div className="flex items-center justify-between gap-4">
+										<p className="!mt-0.5 m-0 flex-1 text-xs text-content-secondary">
+											Set a default autostop for agent-created workspaces that
+											don't have one defined in their template. Template-defined
+											autostop rules always take precedence. Active chats will
+											extend the stop time.
+										</p>
+										<Switch
+											checked={isAutostopEnabled}
+											onCheckedChange={handleToggleAutostop}
+											aria-label="Enable default autostop"
+											disabled={isTTLSaving || isTTLLoading}
+										/>{" "}
 									</div>
+									{isAutostopEnabled && (
+										<DurationField
+											valueMs={ttlMs}
+											onChange={(v) => {
+												setLocalTTLMs(v);
+												// Latch the toggle open while the user is editing
+												// so a background refetch cannot unmount the field.
+												if (autostopToggled === null) {
+													setAutostopToggled(true);
+												}
+											}}
+											label="Autostop Fallback"
+											disabled={isTTLSaving || isTTLLoading}
+											error={isTTLOverMax || isTTLZero}
+											helperText={
+												isTTLZero
+													? "Duration must be greater than zero."
+													: isTTLOverMax
+														? "Must not exceed 30 days (720 hours)."
+														: undefined
+											}
+										/>
+									)}
+									{isAutostopEnabled && (
+										<div className="flex justify-end">
+											<Button
+												size="sm"
+												type="submit"
+												disabled={
+													isTTLSaving ||
+													!isTTLDirty ||
+													isTTLOverMax ||
+													isTTLZero
+												}
+											>
+												Save
+											</Button>
+										</div>
+									)}
 									{isSaveWorkspaceTTLError && (
 										<p className="m-0 text-xs text-content-destructive">
 											Failed to save autostop setting.