feat: add optional multi-run isolation

Adds an Isolate runs toggle for Git projects
Allows Git multi-runs to share the same directory
Keeps non-Git runs unisolated with clear footer info

packages/ui/src/components/multirun/MultiRunLauncher.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { toast } from '@/components/ui';
 import { Button } from '@/components/ui/button';
+import { Checkbox } from '@/components/ui/checkbox';
 import { Input } from '@/components/ui/input';
 import { Textarea } from '@/components/ui/textarea';
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip';
@@ -105,6 +106,7 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
   const [setupCommands, setSetupCommands] = React.useState<string[]>([]);
   const [isSetupCommandsOpen, setIsSetupCommandsOpen] = React.useState(false);
   const [isLoadingSetupCommands, setIsLoadingSetupCommands] = React.useState(false);
+  const [isolateRuns, setIsolateRuns] = React.useState(true);
   const [showFileMention, setShowFileMention] = React.useState(false);
   const [mentionQuery, setMentionQuery] = React.useState('');
   const [showCommandAutocomplete, setShowCommandAutocomplete] = React.useState(false);
@@ -301,6 +303,22 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
   // Use the BranchSelector hook for branch state management
   const [worktreeBaseBranch, setWorktreeBaseBranch] = React.useState<string>('');
   const { isLoading: isLoadingWorktreeBaseBranches, isGitRepository } = useBranchOptions(selectedProjectDirectory);
+  const wasIsolationDisabledByNonGitRef = React.useRef(false);
+  const canIsolateRuns = isGitRepository === true;
+  const effectiveIsolateRuns = canIsolateRuns && isolateRuns;
+
+  React.useEffect(() => {
+    if (isGitRepository === false) {
+      wasIsolationDisabledByNonGitRef.current = true;
+      setIsolateRuns(false);
+      return;
+    }
+
+    if (isGitRepository === true && wasIsolationDisabledByNonGitRef.current) {
+      wasIsolationDisabledByNonGitRef.current = false;
+      setIsolateRuns(true);
+    }
+  }, [isGitRepository]);
 
   const createMultiRun = useMultiRunStore((state) => state.createMultiRun);
   const error = useMultiRunStore((state) => state.error);
@@ -567,7 +585,8 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
         prompt: prompt.trim(),
         models: modelsForStore,
         agent: selectedAgent || undefined,
-        worktreeBaseBranch,
+        worktreeBaseBranch: effectiveIsolateRuns ? worktreeBaseBranch : undefined,
+        isolateRuns: effectiveIsolateRuns,
         files: filesForStore.length > 0 ? filesForStore : undefined,
         setupCommands: commandsForStore.length > 0 ? commandsForStore : undefined,
       };
@@ -592,7 +611,7 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
     selectedModels.length >= 2 &&
     selectedProjectDirectory &&
     !isLoadingWorktreeBaseBranches &&
-    (isGitRepository === false || (isGitRepository === true && worktreeBaseBranch))
+    (isGitRepository === false || !effectiveIsolateRuns || worktreeBaseBranch)
   );
 
   const configuredSetupCount = setupCommands.filter(cmd => cmd.trim()).length;
@@ -698,8 +717,18 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
                   directory={selectedProjectDirectory}
                   value={worktreeBaseBranch}
                   onChange={setWorktreeBaseBranch}
+                  disabled={!effectiveIsolateRuns}
                   id="multirun-worktree-base-branch"
                 />
+                <label className="mt-1.5 flex w-fit items-center gap-1.5 typography-micro text-muted-foreground">
+                  <Checkbox
+                    checked={isolateRuns}
+                    onChange={setIsolateRuns}
+                    disabled={!canIsolateRuns}
+                    ariaLabel={t('multirun.launcher.isolateRuns.label')}
+                  />
+                  <span>{t('multirun.launcher.isolateRuns.label')}</span>
+                </label>
               </div>
 
               {/* Agent */}
@@ -934,7 +963,7 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
       {/* ── Fixed footer ── */}
       <div className="shrink-0 px-4 sm:px-6 py-3">
         <div className="mx-auto w-full max-w-2xl flex items-center justify-end gap-2">
-          {isGitRepository === false ? (
+          {!effectiveIsolateRuns && isGitRepository !== null ? (
             <div className="mr-auto flex min-w-0 items-center gap-1.5 typography-micro text-muted-foreground">
               <Icon name="information" className="h-3.5 w-3.5 shrink-0" />
               <span className="truncate">{t('multirun.launcher.project.gitRequired')}</span>

packages/ui/src/lib/i18n/messages/en.ts

@@ -151,6 +151,7 @@ export const dict = {
   'multirun.launcher.groupName.placeholder': 'feature-auth, bugfix-login',
   'multirun.launcher.baseBranch.label': 'Base branch',
   'multirun.launcher.baseBranch.info': 'New branch created from this base per model',
+  'multirun.launcher.isolateRuns.label': 'Isolate runs',
   'multirun.launcher.agent.label': 'Agent',
   'multirun.launcher.agent.info': 'Agent used for all runs. Defaults to your configured agent.',
   'multirun.launcher.setupCommands.label': 'Setup commands',

packages/ui/src/lib/i18n/messages/es.ts

@@ -152,6 +152,7 @@ export const dict: Record<I18nKey, string> = {
   "multirun.launcher.groupName.placeholder": "feature-auth, bugfix-login",
   "multirun.launcher.baseBranch.label": "Rama base",
   "multirun.launcher.baseBranch.info": "Nueva rama creada desde esta base por modelo",
+  "multirun.launcher.isolateRuns.label": "Aislar ejecuciones",
   "multirun.launcher.agent.label": "Agente",
   "multirun.launcher.agent.info": "Agente usado para todas las ejecuciones. Por defecto es el agente configurado.",
   "multirun.launcher.setupCommands.label": "Comandos de configuración",

packages/ui/src/lib/i18n/messages/ko.ts

@@ -152,6 +152,7 @@ export const dict: Record<I18nKey, string> = {
   'multirun.launcher.groupName.placeholder': 'feature-auth, bugfix-login',
   'multirun.launcher.baseBranch.label': '기본 브랜치',
   'multirun.launcher.baseBranch.info': '각 모델은 이 기본 브랜치에서 새 브랜치를 만듭니다',
+  'multirun.launcher.isolateRuns.label': '실행 격리',
   'multirun.launcher.agent.label': '에이전트',
   'multirun.launcher.agent.info': '모든 실행에 사용할 에이전트입니다. 설정된 기본 에이전트를 사용합니다.',
   'multirun.launcher.setupCommands.label': '셋업 명령',

packages/ui/src/lib/i18n/messages/pl.ts

@@ -227,6 +227,7 @@ export const dict: Record<I18nKey, string> = {
   'multirun.launcher.groupName.placeholder': 'feature-auth, bugfix-login',
   'multirun.launcher.baseBranch.label': 'Gałąź bazowa',
   'multirun.launcher.baseBranch.info': 'Nowa gałąź tworzona z tej bazy dla każdego modelu',
+  'multirun.launcher.isolateRuns.label': 'Izoluj uruchomienia',
   'multirun.launcher.agent.label': 'Agent',
   'multirun.launcher.agent.info': 'Agent używany dla wszystkich uruchomień. Domyślnie twój skonfigurowany agent.',
   'multirun.launcher.setupCommands.label': 'Polecenia konfiguracji',

packages/ui/src/lib/i18n/messages/pt-BR.ts

@@ -152,6 +152,7 @@ export const dict: Record<I18nKey, string> = {
   "multirun.launcher.groupName.placeholder": "feature-auth, bugfix-login",
   "multirun.launcher.baseBranch.label": "Branch base",
   "multirun.launcher.baseBranch.info": "Cria uma nova branch a partir desta base para cada modelo",
+  "multirun.launcher.isolateRuns.label": "Isolar execuções",
   "multirun.launcher.agent.label": "Agente",
   "multirun.launcher.agent.info": "Agente usado para todas as execuções. Por padrão, usa o agente configurado.",
   "multirun.launcher.setupCommands.label": "Comandos de configuração",

packages/ui/src/lib/i18n/messages/uk.ts

@@ -152,6 +152,7 @@ export const dict: Record<I18nKey, string> = {
   "multirun.launcher.groupName.placeholder": "feature-auth, bugfix-login",
   "multirun.launcher.baseBranch.label": "Базова гілка",
   "multirun.launcher.baseBranch.info": "Нова гілка, створена з цієї бази для кожної моделі",
+  "multirun.launcher.isolateRuns.label": "Ізолювати запуски",
   "multirun.launcher.agent.label": "Агент",
   "multirun.launcher.agent.info": "Агент використовується для всіх запусків. За замовчуванням налаштований агент.",
   "multirun.launcher.setupCommands.label": "Команди налаштування",

packages/ui/src/lib/i18n/messages/zh-CN.ts

@@ -152,6 +152,7 @@ export const dict: Record<I18nKey, string> = {
   'multirun.launcher.groupName.placeholder': 'feature-auth, bugfix-login',
   'multirun.launcher.baseBranch.label': '基础分支',
   'multirun.launcher.baseBranch.info': '每个模型都会基于此分支创建新分支',
+  'multirun.launcher.isolateRuns.label': '隔离运行',
   'multirun.launcher.agent.label': '智能体',
   'multirun.launcher.agent.info': '所有运行使用同一智能体。默认使用你当前配置的智能体。',
   'multirun.launcher.setupCommands.label': '设置命令',

packages/ui/src/stores/useMultiRunStore.ts

@@ -118,10 +118,11 @@ export const useMultiRunStore = create<MultiRunStore>()(
           const directory = project.path;
 
           const isGit = await checkIsGitRepository(directory);
+          const shouldIsolateRuns = isGit && params.isolateRuns !== false;
 
           const groupSlug = toGitSafeSlug(groupName);
-          const rootBranch = isGit ? await getRootBranch(directory) : undefined;
+          const rootBranch = shouldIsolateRuns ? await getRootBranch(directory) : undefined;
-          const rootTrackingRemote = isGit ? await resolveRootTrackingRemote(directory) : null;
+          const rootTrackingRemote = shouldIsolateRuns ? await resolveRootTrackingRemote(directory) : null;
 
           const createdRuns: Array<{
             sessionId: string;
@@ -161,7 +162,7 @@ export const useMultiRunStore = create<MultiRunStore>()(
                 ? `${groupSlug}/${model.providerID}/${model.modelID}/${index}`
                 : `${groupSlug}/${model.providerID}/${model.modelID}`;
 
-              if (!isGit) {
+              if (!shouldIsolateRuns) {
                 const session = await opencodeClient.withDirectory(
                   directory,
                   () => opencodeClient.createSession({ title: sessionTitle })

packages/ui/src/types/multirun.ts

@@ -32,6 +32,8 @@ export interface CreateMultiRunParams {
   agent?: string;
   /** Base branch for new branches (defaults to `HEAD`). */
   worktreeBaseBranch?: string;
+  /** Whether Git projects should isolate each run in its own worktree. */
+  isolateRuns?: boolean;
   /** Files to attach to all runs */
   files?: MultiRunFileAttachment[];
   /** Setup commands to run in each new worktree after creation */