fix(desktop): more defensive agent access

packages/app/src/components/prompt-input.tsx

@@ -1115,11 +1115,17 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
     setStore("imageAttachments", [])
     setStore("mode", "normal")
 
+    const currentModel = local.model.current()
+    const currentAgent = local.agent.current()
+    if (!currentModel || !currentAgent) {
+      console.warn("No agent or model available for prompt submission")
+      return
+    }
     const model = {
-      modelID: local.model.current()!.id,
-      providerID: local.model.current()!.provider.id,
+      modelID: currentModel.id,
+      providerID: currentModel.provider.id,
     }
-    const agent = local.agent.current()!.name
+    const agent = currentAgent.name
 
     if (isShellMode) {
       sdk.client.session
@@ -1360,7 +1366,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
                 >
                   <Select
                     options={local.agent.list().map((agent) => agent.name)}
-                    current={local.agent.current().name}
+                    current={local.agent.current()?.name ?? ""}
                     onSelect={local.agent.set}
                     class="capitalize"
                     variant="ghost"

packages/app/src/context/local.tsx

@@ -65,23 +65,40 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
     const agent = (() => {
       const list = createMemo(() => sync.data.agent.filter((x) => x.mode !== "subagent" && !x.hidden))
       const [store, setStore] = createStore<{
-        current: string
+        current?: string
       }>({
-        current: list()[0].name,
+        current: list()[0]?.name,
       })
       return {
         list,
         current() {
-          return list().find((x) => x.name === store.current)!
+          const available = list()
+          if (available.length === 0) return undefined
+          return available.find((x) => x.name === store.current) ?? available[0]
         },
         set(name: string | undefined) {
-          setStore("current", name ?? list()[0].name)
+          const available = list()
+          if (available.length === 0) {
+            setStore("current", undefined)
+            return
+          }
+          if (name && available.some((x) => x.name === name)) {
+            setStore("current", name)
+            return
+          }
+          setStore("current", available[0].name)
         },
         move(direction: 1 | -1) {
-          let next = list().findIndex((x) => x.name === store.current) + direction
-          if (next < 0) next = list().length - 1
-          if (next >= list().length) next = 0
-          const value = list()[next]
+          const available = list()
+          if (available.length === 0) {
+            setStore("current", undefined)
+            return
+          }
+          let next = available.findIndex((x) => x.name === store.current) + direction
+          if (next < 0) next = available.length - 1
+          if (next >= available.length) next = 0
+          const value = available[next]
+          if (!value) return
           setStore("current", value.name)
           if (value.model)
             model.set({
@@ -182,11 +199,13 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
 
       const current = createMemo(() => {
         const a = agent.current()
+        if (!a) return undefined
         const key = getFirstValidModel(
           () => ephemeral.model[a.name],
           () => a.model,
           fallbackModel,
-        )!
+        )
+        if (!key) return undefined
         return find(key)
       })
 
@@ -232,7 +251,8 @@ export const { use: useLocal, provider: LocalProvider } = createSimpleContext({
         cycle,
         set(model: ModelKey | undefined, options?: { recent?: boolean }) {
           batch(() => {
-            setEphemeral("model", agent.current().name, model ?? fallbackModel())
+            const currentAgent = agent.current()
+            if (currentAgent) setEphemeral("model", currentAgent.name, model ?? fallbackModel())
             if (model) updateVisibility(model, "show")
             if (options?.recent && model) {
               const uniq = uniqueBy([model, ...store.recent], (x) => x.providerID + x.modelID)