fix: restore input on submission error and enforce clean working tree for git operations

packages/app/src/app/agent/new.tsx

@@ -122,6 +122,7 @@ export default function DraftAgentScreen() {
   >(null);
   const [errorMessage, setErrorMessage] = useState("");
   const [isLoading, setIsLoading] = useState(false);
+  const [promptText, setPromptText] = useState("");
   const [baseBranch, setBaseBranch] = useState("");
   // Isolation mode: "none" | "branch" | "worktree"
   const [isolationMode, setIsolationMode] = useState<"none" | "branch" | "worktree">("none");
@@ -487,27 +488,27 @@ export default function DraftAgentScreen() {
       const trimmedPrompt = text.trim();
       if (!trimmedPath) {
         setErrorMessage("Working directory is required");
-        return;
+        throw new Error("Working directory is required");
       }
       if (!trimmedPrompt) {
         setErrorMessage("Initial prompt is required");
-        return;
+        throw new Error("Initial prompt is required");
       }
       if (!selectedServerId) {
         setErrorMessage("No host selected");
-        return;
+        throw new Error("No host selected");
       }
       if (gitBlockingError) {
         setErrorMessage(gitBlockingError);
-        return;
+        throw new Error(gitBlockingError);
       }
       if (isLoading) {
-        return;
+        throw new Error("Already loading");
       }
       const createAgent = sessionMethods?.createAgent;
       if (!createAgent) {
         setErrorMessage("Host is not connected");
-        return;
+        throw new Error("Host is not connected");
       }
       const modeId =
         modeOptions.length > 0 && selectedMode !== "" ? selectedMode : undefined;
@@ -608,6 +609,7 @@ export default function DraftAgentScreen() {
       }
       pendingRequestIdRef.current = null;
       setIsLoading(false);
+      setPromptText("");
       router.push({
         pathname: "/agent/[serverId]/[agentId]",
         params: {
@@ -905,6 +907,8 @@ export default function DraftAgentScreen() {
             serverId={selectedServerId ?? ""}
             onSubmitMessage={handleCreateFromInput}
             isSubmitLoading={isLoading}
+            value={promptText}
+            onChangeText={setPromptText}
           />
         </View>
       </View>

packages/app/src/components/agent-input-area.tsx

@@ -52,6 +52,8 @@ interface AgentInputAreaProps {
   }) => Promise<void>;
   /** Externally controlled loading state. When true, disables the submit button. */
   isSubmitLoading?: boolean;
+  value?: string;
+  onChangeText?: (text: string) => void;
 }
 
 const MIN_INPUT_HEIGHT = 50;
@@ -96,6 +98,8 @@ export function AgentInputArea({
   serverId,
   onSubmitMessage,
   isSubmitLoading = false,
+  value,
+  onChangeText,
 }: AgentInputAreaProps) {
   const { theme } = useUnistyles();
   const insets = useSafeAreaInsets();
@@ -146,7 +150,9 @@ export function AgentInputArea({
   const wsOrInert = ws ?? inertWebSocket;
   const { startRealtime, stopRealtime, isRealtimeMode } = useRealtime();
   
-  const [userInput, setUserInput] = useState("");
+  const [internalInput, setInternalInput] = useState("");
+  const userInput = value ?? internalInput;
+  const setUserInput = onChangeText ?? setInternalInput;
   const [inputHeight, setInputHeight] = useState(MIN_INPUT_HEIGHT);
   const [isProcessing, setIsProcessing] = useState(false);
   const [selectedImages, setSelectedImages] = useState<Array<{ uri: string; mimeType: string }>>([]);
@@ -367,8 +373,11 @@ export function AgentInputArea({
 
     const message = userInput.trim();
     const imageAttachments = selectedImages.length > 0 ? selectedImages : undefined;
-    
-    setUserInput("");
+
+    const isControlled = value !== undefined;
+    if (!isControlled) {
+      setUserInput("");
+    }
     setSelectedImages([]);
     setInputHeight(MIN_INPUT_HEIGHT);
     setIsProcessing(true);
@@ -377,6 +386,11 @@ export function AgentInputArea({
       await submitMessage(message, imageAttachments);
     } catch (error) {
       console.error("[AgentInput] Failed to send message:", error);
+      // Restore input on error so user doesn't lose their message
+      setUserInput(message);
+      if (imageAttachments) {
+        setSelectedImages(imageAttachments);
+      }
     } finally {
       setIsProcessing(false);
     }

packages/server/src/server/session.ts

@@ -1503,10 +1503,6 @@ export class Session {
       };
     }
 
-    if (!normalized.createWorktree) {
-      await this.ensureCleanWorkingTree(cwd);
-    }
-
     if (normalized.createWorktree) {
       const targetBranch = normalized.createNewBranch
         ? normalized.newBranchName
@@ -1751,6 +1747,7 @@ export class Session {
       return;
     }
 
+    await this.ensureCleanWorkingTree(cwd);
     await execAsync(`git checkout ${branch}`, { cwd });
   }
 
@@ -1773,6 +1770,7 @@ export class Session {
       throw new Error(`Branch already exists: ${newBranchName}`);
     }
 
+    await this.ensureCleanWorkingTree(cwd);
     await execAsync(`git checkout -b ${newBranchName} ${baseBranch}`, {
       cwd,
     });