fix(web): add default thread env mode setting

KEYBINDINGS.md

@@ -51,7 +51,7 @@ Invalid rules are ignored. Invalid config files are ignored. Warnings are logged
 - `terminal.new`: create new terminal (in focused terminal context by default)
 - `terminal.close`: close/kill the focused terminal (in focused terminal context by default)
 - `chat.new`: create a new chat thread preserving the active thread's branch/worktree state
-- `chat.newLocal`: create a new local chat thread for the active project (no worktree context)
+- `chat.newLocal`: create a new chat thread for the active project in a new environment (local/worktree determined by app settings (default `local`))
 - `editor.openFavorite`: open current project/worktree in the last-used editor
 - `script.{id}.run`: run a project script by id (for example `script.test.run`)
 

apps/web/src/appSettings.ts

@@ -21,6 +21,9 @@ const AppSettingsSchema = Schema.Struct({
   codexHomePath: Schema.String.check(Schema.isMaxLength(4096)).pipe(
     Schema.withConstructorDefault(() => Option.some("")),
   ),
+  defaultThreadEnvMode: Schema.Literals(["local", "worktree"]).pipe(
+    Schema.withConstructorDefault(() => Option.some("local")),
+  ),
   confirmThreadDelete: Schema.Boolean.pipe(Schema.withConstructorDefault(() => Option.some(true))),
   enableAssistantStreaming: Schema.Boolean.pipe(
     Schema.withConstructorDefault(() => Option.some(false)),

apps/web/src/components/Sidebar.logic.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, it } from "vitest";
 
 import {
   hasUnseenCompletion,
+  resolveSidebarNewThreadEnvMode,
   resolveThreadRowClassName,
   resolveThreadStatusPill,
   shouldClearThreadSelectionOnMouseDown,
@@ -63,6 +64,25 @@ describe("shouldClearThreadSelectionOnMouseDown", () => {
   });
 });
 
+describe("resolveSidebarNewThreadEnvMode", () => {
+  it("uses the app default when the caller does not request a specific mode", () => {
+    expect(
+      resolveSidebarNewThreadEnvMode({
+        defaultEnvMode: "worktree",
+      }),
+    ).toBe("worktree");
+  });
+
+  it("preserves an explicit requested mode over the app default", () => {
+    expect(
+      resolveSidebarNewThreadEnvMode({
+        requestedEnvMode: "local",
+        defaultEnvMode: "worktree",
+      }),
+    ).toBe("local");
+  });
+});
+
 describe("resolveThreadStatusPill", () => {
   const baseThread = {
     interactionMode: "plan" as const,

apps/web/src/components/Sidebar.logic.ts

@@ -3,6 +3,7 @@ import { cn } from "../lib/utils";
 import { findLatestProposedPlan, isLatestTurnSettled } from "../session-logic";
 
 export const THREAD_SELECTION_SAFE_SELECTOR = "[data-thread-item], [data-thread-selection-safe]";
+export type SidebarNewThreadEnvMode = "local" | "worktree";
 
 export interface ThreadStatusPill {
   label:
@@ -38,6 +39,13 @@ export function shouldClearThreadSelectionOnMouseDown(target: HTMLElement | null
   return !target.closest(THREAD_SELECTION_SAFE_SELECTOR);
 }
 
+export function resolveSidebarNewThreadEnvMode(input: {
+  requestedEnvMode?: SidebarNewThreadEnvMode;
+  defaultEnvMode: SidebarNewThreadEnvMode;
+}): SidebarNewThreadEnvMode {
+  return input.requestedEnvMode ?? input.defaultEnvMode;
+}
+
 export function resolveThreadRowClassName(input: {
   isActive: boolean;
   isSelected: boolean;

apps/web/src/components/Sidebar.tsx

@@ -84,6 +84,7 @@ import { useThreadSelectionStore } from "../threadSelectionStore";
 import { formatWorktreePathForDisplay, getOrphanedWorktreePathForThread } from "../worktreeCleanup";
 import { isNonEmpty as isNonEmptyString } from "effect/String";
 import {
+  resolveSidebarNewThreadEnvMode,
   resolveThreadRowClassName,
   resolveThreadStatusPill,
   shouldClearThreadSelectionOnMouseDown,
@@ -440,7 +441,9 @@ export default function Sidebar() {
           defaultModel: DEFAULT_MODEL_BY_PROVIDER.codex,
           createdAt,
         });
-        await handleNewThread(projectId).catch(() => undefined);
+        await handleNewThread(projectId, {
+          envMode: appSettings.defaultThreadEnvMode,
+        }).catch(() => undefined);
       } catch (error) {
         const description =
           error instanceof Error ? error.message : "An error occurred while adding the project.";
@@ -464,6 +467,7 @@ export default function Sidebar() {
       isAddingProject,
       projects,
       shouldBrowseForProjectImmediately,
+      appSettings.defaultThreadEnvMode,
     ],
   );
 
@@ -1355,7 +1359,11 @@ export default function Sidebar() {
                                     onClick={(event) => {
                                       event.preventDefault();
                                       event.stopPropagation();
-                                      void handleNewThread(project.id);
+                                      void handleNewThread(project.id, {
+                                        envMode: resolveSidebarNewThreadEnvMode({
+                                          defaultEnvMode: appSettings.defaultThreadEnvMode,
+                                        }),
+                                      });
                                     }}
                                   >
                                     <SquarePenIcon className="size-3.5" />

apps/web/src/components/ui/switch.tsx

@@ -8,7 +8,7 @@ function Switch({ className, ...props }: SwitchPrimitive.Root.Props) {
   return (
     <SwitchPrimitive.Root
       className={cn(
-        "inline-flex h-[calc(var(--thumb-size)+2px)] w-[calc(var(--thumb-size)*2-2px)] shrink-0 items-center rounded-full p-px outline-none transition-[background-color,box-shadow] duration-200 [--thumb-size:--spacing(5)] focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-1 focus-visible:ring-offset-background data-checked:bg-primary data-unchecked:bg-input data-disabled:opacity-64 sm:[--thumb-size:--spacing(4)]",
+        "inline-flex h-[calc(var(--thumb-size)+2px)] w-[calc(var(--thumb-size)*2-2px)] shrink-0 cursor-pointer items-center rounded-full p-px outline-none transition-[background-color,box-shadow] duration-200 [--thumb-size:--spacing(5)] focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-1 focus-visible:ring-offset-background data-checked:bg-primary data-unchecked:bg-input data-disabled:cursor-not-allowed data-disabled:opacity-64 sm:[--thumb-size:--spacing(4)]",
         className,
       )}
       data-slot="switch"

apps/web/src/routes/_chat.settings.tsx

@@ -502,6 +502,49 @@ function SettingsRouteView() {
               </div>
             </section>
 
+            <section className="rounded-2xl border border-border bg-card p-5">
+              <div className="mb-4">
+                <h2 className="text-sm font-medium text-foreground">Threads</h2>
+                <p className="mt-1 text-xs text-muted-foreground">
+                  Choose the default workspace mode for newly created draft threads.
+                </p>
+              </div>
+
+              <div className="flex items-center justify-between rounded-lg border border-border bg-background px-3 py-2">
+                <div>
+                  <p className="text-sm font-medium text-foreground">Default to New worktree</p>
+                  <p className="text-xs text-muted-foreground">
+                    New threads start in New worktree mode instead of Local.
+                  </p>
+                </div>
+                <Switch
+                  checked={settings.defaultThreadEnvMode === "worktree"}
+                  onCheckedChange={(checked) =>
+                    updateSettings({
+                      defaultThreadEnvMode: checked ? "worktree" : "local",
+                    })
+                  }
+                  aria-label="Default new threads to New worktree mode"
+                />
+              </div>
+
+              {settings.defaultThreadEnvMode !== defaults.defaultThreadEnvMode ? (
+                <div className="mt-3 flex justify-end">
+                  <Button
+                    size="xs"
+                    variant="outline"
+                    onClick={() =>
+                      updateSettings({
+                        defaultThreadEnvMode: defaults.defaultThreadEnvMode,
+                      })
+                    }
+                  >
+                    Restore default
+                  </Button>
+                </div>
+              ) : null}
+            </section>
+
             <section className="rounded-2xl border border-border bg-card p-5">
               <div className="mb-4">
                 <h2 className="text-sm font-medium text-foreground">Responses</h2>

apps/web/src/routes/_chat.tsx

@@ -12,6 +12,8 @@ import { resolveShortcutCommand } from "../keybindings";
 import { selectThreadTerminalState, useTerminalStateStore } from "../terminalStateStore";
 import { useThreadSelectionStore } from "../threadSelectionStore";
 import { Sidebar, SidebarProvider } from "~/components/ui/sidebar";
+import { resolveSidebarNewThreadEnvMode } from "~/components/Sidebar.logic";
+import { useAppSettings } from "~/appSettings";
 
 const EMPTY_KEYBINDINGS: ResolvedKeybindingsConfig = [];
 
@@ -27,6 +29,7 @@ function ChatRouteGlobalShortcuts() {
       ? selectThreadTerminalState(state.terminalStateByThreadId, routeThreadId).terminalOpen
       : false,
   );
+  const { settings: appSettings } = useAppSettings();
 
   useEffect(() => {
     const onWindowKeyDown = (event: KeyboardEvent) => {
@@ -51,7 +54,11 @@ function ChatRouteGlobalShortcuts() {
       if (command === "chat.newLocal") {
         event.preventDefault();
         event.stopPropagation();
-        void handleNewThread(projectId);
+        void handleNewThread(projectId, {
+          envMode: resolveSidebarNewThreadEnvMode({
+            defaultEnvMode: appSettings.defaultThreadEnvMode,
+          }),
+        });
         return;
       }
 
@@ -78,6 +85,7 @@ function ChatRouteGlobalShortcuts() {
     projects,
     selectedThreadIdsSize,
     terminalOpen,
+    appSettings.defaultThreadEnvMode,
   ]);
 
   return null;