fix(worktrees): disable selector outside git repos

Expose isGitRepo on worktree listing and show Worktree: Unavailable while disabling the dropdown when a workspace folder is not a Git repository.

packages/server/src/api-types.ts

@@ -64,6 +64,8 @@ export interface WorktreeDescriptor {
 
 export interface WorktreeListResponse {
   worktrees: WorktreeDescriptor[]
+  /** True when the workspace folder resolves to a Git repository. */
+  isGitRepo?: boolean
 }
 
 export interface WorktreeCreateRequest {

packages/server/src/server/routes/worktrees.ts

@@ -34,9 +34,9 @@ export function registerWorktreeRoutes(app: FastifyInstance, deps: RouteDeps) {
       return { error: "Workspace not found" }
     }
 
-    const { repoRoot } = await resolveRepoRoot(workspace.path, request.log)
+    const { repoRoot, isGitRepo } = await resolveRepoRoot(workspace.path, request.log)
     const worktrees = await listWorktrees({ repoRoot, workspaceFolder: workspace.path, logger: request.log })
-    const response: WorktreeListResponse = { worktrees }
+    const response: WorktreeListResponse = { worktrees, isGitRepo }
     return response
   })
 

packages/ui/src/components/worktree-selector.tsx

@@ -10,6 +10,7 @@ import {
   createWorktree,
   deleteWorktree,
   getParentSessionId,
+  getGitRepoStatus,
   getWorktreeSlugForParentSession,
   getWorktrees,
   reloadWorktreeMap,
@@ -85,6 +86,10 @@ export default function WorktreeSelector(props: WorktreeSelectorProps) {
   const parentId = createMemo(() => getParentSessionId(props.instanceId, props.sessionId))
   const currentSlug = createMemo(() => getWorktreeSlugForParentSession(props.instanceId, parentId()))
 
+  const gitRepoStatus = createMemo(() => getGitRepoStatus(props.instanceId))
+  const worktreesUnavailable = createMemo(() => gitRepoStatus() === false)
+  const dropdownDisabled = createMemo(() => isChildSession() || worktreesUnavailable())
+
   const worktreeOptions = createMemo<WorktreeOption[]>(() => {
     const list = getWorktrees(props.instanceId)
     const mapped: WorktreeOption[] = list.map((wt) => ({
@@ -134,6 +139,7 @@ export default function WorktreeSelector(props: WorktreeSelectorProps) {
   }
 
   const handleChange = async (value: WorktreeOption | null) => {
+    if (worktreesUnavailable()) return
     if (!value) return
     if (value.kind === "action") {
       setIsOpen(false)
@@ -157,7 +163,7 @@ export default function WorktreeSelector(props: WorktreeSelectorProps) {
         optionValue="key"
         optionTextValue={(opt) => (opt.kind === "action" ? opt.label : opt.slug)}
         placeholder="Worktree"
-        disabled={isChildSession()}
+        disabled={dropdownDisabled()}
         itemComponent={(itemProps) => {
           const opt = itemProps.item.rawValue
           if (opt.kind === "action") {
@@ -234,6 +240,14 @@ export default function WorktreeSelector(props: WorktreeSelectorProps) {
           <div class="flex-1 min-w-0">
             <Select.Value<WorktreeOption>>
               {(state) => {
+                if (worktreesUnavailable()) {
+                  return (
+                    <div class="selector-trigger-label selector-trigger-label--stacked">
+                      <span class="selector-trigger-primary selector-trigger-primary--align-left">Worktree: Unavailable</span>
+                    </div>
+                  )
+                }
+
                 const value = state.selectedOption()
                 const label = value && value.kind === "worktree" ? (value.slug === "root" ? "root" : value.slug) : "root"
                 return (

packages/ui/src/stores/worktrees.ts

@@ -9,6 +9,7 @@ const log = getLogger("api")
 
 const [worktreesByInstance, setWorktreesByInstance] = createSignal<Map<string, WorktreeDescriptor[]>>(new Map())
 const [worktreeMapByInstance, setWorktreeMapByInstance] = createSignal<Map<string, WorktreeMap>>(new Map())
+const [gitRepoStatusByInstance, setGitRepoStatusByInstance] = createSignal<Map<string, boolean | null>>(new Map())
 
 const worktreeLoads = new Map<string, Promise<void>>()
 const mapLoads = new Map<string, Promise<void>>()
@@ -26,7 +27,7 @@ function normalizeMap(input?: WorktreeMap | null): WorktreeMap {
 
 async function ensureWorktreesLoaded(instanceId: string): Promise<void> {
   if (!instanceId) return
-  if (worktreesByInstance().has(instanceId)) return
+  if (worktreesByInstance().has(instanceId) && gitRepoStatusByInstance().has(instanceId)) return
   const existing = worktreeLoads.get(instanceId)
   if (existing) return existing
 
@@ -38,6 +39,12 @@ async function ensureWorktreesLoaded(instanceId: string): Promise<void> {
         next.set(instanceId, response.worktrees ?? [])
         return next
       })
+
+      setGitRepoStatusByInstance((prev) => {
+        const next = new Map(prev)
+        next.set(instanceId, typeof response.isGitRepo === "boolean" ? response.isGitRepo : null)
+        return next
+      })
     })
     .catch((error) => {
       log.warn("Failed to load worktrees", { instanceId, error })
@@ -46,6 +53,14 @@ async function ensureWorktreesLoaded(instanceId: string): Promise<void> {
         next.set(instanceId, [])
         return next
       })
+
+      // Preserve any previous value; if unknown, keep it unknown.
+      setGitRepoStatusByInstance((prev) => {
+        if (prev.has(instanceId)) return prev
+        const next = new Map(prev)
+        next.set(instanceId, null)
+        return next
+      })
     })
     .finally(() => {
       worktreeLoads.delete(instanceId)
@@ -65,12 +80,22 @@ async function reloadWorktrees(instanceId: string): Promise<void> {
         next.set(instanceId, response.worktrees ?? [])
         return next
       })
+
+      setGitRepoStatusByInstance((prev) => {
+        const next = new Map(prev)
+        next.set(instanceId, typeof response.isGitRepo === "boolean" ? response.isGitRepo : null)
+        return next
+      })
     })
     .catch((error) => {
       log.warn("Failed to reload worktrees", { instanceId, error })
     })
 }
 
+function getGitRepoStatus(instanceId: string): boolean | null {
+  return gitRepoStatusByInstance().get(instanceId) ?? null
+}
+
 async function createWorktree(instanceId: string, slug: string): Promise<{ slug: string; directory: string; branch?: string }> {
   if (!instanceId) {
     throw new Error("Missing instanceId")
@@ -242,10 +267,12 @@ function getRootClient(instanceId: string): OpencodeClient {
 export {
   worktreesByInstance,
   worktreeMapByInstance,
+  gitRepoStatusByInstance,
   ensureWorktreesLoaded,
   reloadWorktrees,
   reloadWorktreeMap,
   ensureWorktreeMapLoaded,
+  getGitRepoStatus,
   getWorktrees,
   getWorktreeMap,
   getDefaultWorktreeSlug,