feat: add regenerate button to re‑send last prompt

src/renderer/src/assets/main.css

@@ -3036,6 +3036,36 @@ body {
   background: var(--bg-hover);
 }
 
+/* Regenerate button — thin bar below the last agent response */
+.chat-regenerate-bar {
+  display: flex;
+  justify-content: flex-start;
+  margin-left: 42px;
+  margin-top: 6px;
+  margin-bottom: 4px;
+}
+
+.chat-regenerate-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 12px;
+  background: none;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  color: var(--text-secondary);
+  font-size: 12px;
+  font-family: var(--font-sans);
+  cursor: pointer;
+  transition: all var(--transition);
+}
+
+.chat-regenerate-btn:hover {
+  color: var(--text-primary);
+  border-color: var(--border-bright);
+  background: var(--bg-tertiary);
+}
+
 /* Inline clarify card — a mid-turn question rendered in the transcript. */
 .chat-clarify {
   margin-top: 8px;

src/renderer/src/screens/Chat/Chat.tsx

@@ -468,6 +468,17 @@ function Chat({
     chatInputRef.current?.setText(text);
   }, []);
 
+  // Regenerate: re-send the last user message to get a new agent response
+  const handleRegenerate = useCallback(() => {
+    const lastUser = [...messages]
+      .reverse()
+      .find((m) => m.role === "user") as
+      | import("./types").ChatBubbleMessage
+      | undefined;
+    if (!lastUser?.content) return;
+    void handleSendRef.current(lastUser.content, lastUser.attachments || []);
+  }, [messages]);
+
   const handlePickFolder = useCallback(async () => {
     const path = await window.hermesAPI.selectFolder();
     if (path) setContextFolder(path);
@@ -559,6 +570,7 @@ function Chat({
               onApprove={actions.handleApprove}
               onDeny={actions.handleDeny}
               onClarifyResolved={handleClarifyResolved}
+              onRegenerate={handleRegenerate}
             />
           )}
           <div ref={bottomRef} />

src/renderer/src/screens/Chat/MessageList.tsx

@@ -1,7 +1,9 @@
 import { memo, useMemo } from "react";
+import { RefreshCw } from "lucide-react";
 import { HermesAvatar, MessageRow } from "./MessageRow";
 import { ReasoningRow, ToolActivityGroup } from "./HistoryRow";
 import { ClarifyCard } from "./ClarifyCard";
+import { useI18n } from "../../components/useI18n";
 import type {
   ChatMessage,
   ClarifyMessage,
@@ -22,6 +24,8 @@ interface MessageListProps {
   onDeny: () => void;
   /** Mark an inline clarify card resolved once the user answers/skips. */
   onClarifyResolved: (requestId: string, answer: string) => void;
+  /** Called when the user clicks the regenerate button below the last agent response. */
+  onRegenerate?: () => void;
 }
 
 function TypingIndicator({
@@ -59,13 +63,31 @@ function isBubble(m: ChatMessage): m is import("./types").ChatBubbleMessage {
   return !k || k === "user" || k === "assistant";
 }
 
+function RegenerateBar({ onClick }: { onClick: () => void }): React.JSX.Element {
+  const { t } = useI18n();
+  return (
+    <div className="chat-regenerate-bar">
+      <button
+        type="button"
+        className="chat-regenerate-btn"
+        onClick={onClick}
+        title={t("chat.regenerate")}
+      >
+        <RefreshCw size={14} />
+        <span>{t("chat.regenerate")}</span>
+      </button>
+    </div>
+  );
+}
+
 export const MessageList = memo(function MessageList({
   messages,
   isLoading,
   toolProgress,
   onApprove,
   onDeny,
   onClarifyResolved,
+  onRegenerate,
 }: MessageListProps): React.JSX.Element {
   // Bubbles with empty content are still hidden (live-stream placeholders).
   // History rows pass through unconditionally.
@@ -81,6 +103,13 @@ export const MessageList = memo(function MessageList({
   const lastBubble = [...messages].reverse().find(isBubble);
   const lastMessageIsAgent = !!lastBubble && lastBubble.role === "agent";
 
+  // Show regenerate: not loading, last message is from agent, has at least one user message
+  const hasUserMessage = messages.some(
+    (m) => isBubble(m) && m.role === "user",
+  );
+  const showRegenerate =
+    onRegenerate && !isLoading && lastMessageIsAgent && hasUserMessage;
+
   // Render plan: bubble/reasoning rows pass through one-to-one, but a
   // contiguous run of tool_call/tool_result rows folds into a single
   // ToolActivityGroup (collapsed by default) instead of one bubble per call.
@@ -162,6 +191,8 @@ export const MessageList = memo(function MessageList({
     <>
       {rows}
 
+      {showRegenerate && <RegenerateBar onClick={onRegenerate} />}
+
       {isLoading && !lastMessageIsAgent && (
         <TypingIndicator toolProgress={toolProgress} />
       )}
@@ -171,4 +202,4 @@ export const MessageList = memo(function MessageList({
       )}
     </>
   );
-});
+});

src/shared/i18n/locales/en/chat.ts

@@ -132,6 +132,8 @@ export default {
   queuedCount: "{{count}} queued",
   queuedAttachment: "{{count}} attachment(s)",
   queuedCancel: "Remove from queue",
+  copyMessage: "Copy message",
+  regenerate: "Regenerate",
   worktree: {
     loading: "Loading",
     empty: "Folder is empty",

src/shared/i18n/locales/es/chat.ts

@@ -108,6 +108,8 @@ export default {
   },
   queued: "{{count}} mensaje(s) en cola — se enviará cuando el agente termine",
   queuedCancel: "Quitar de la cola",
+  copyMessage: "Copiar mensaje",
+  regenerate: "Regenerar",
   worktree: {
     loading: "Cargando",
     empty: "La carpeta está vacía",

src/shared/i18n/locales/id/chat.ts

@@ -82,6 +82,8 @@ export default {
     version: "Tampilkan versi Hermes",
   },
   queuedCancel: "Batalkan pesan antrian",
+  copyMessage: "Salin pesan",
+  regenerate: "Buat ulang",
   worktree: {
     loading: "Memuat",
     empty: "Folder kosong",

src/shared/i18n/locales/ja/chat.ts

@@ -81,6 +81,8 @@ export default {
     version: "Hermes バージョンを表示",
   },
   queuedCancel: "キューから削除",
+  copyMessage: "メッセージをコピー",
+  regenerate: "再生成",
   worktree: {
     loading: "読み込み中",
     empty: "フォルダは空です",

src/shared/i18n/locales/pl/chat.ts

@@ -88,6 +88,8 @@ export default {
   queued:
     "{{count}} wiadomość/wiadomości w kolejce — zostaną wysłane po zakończeniu pracy agenta",
   queuedCancel: "Usuń z kolejki",
+  copyMessage: "Kopiuj wiadomość",
+  regenerate: "Wygeneruj ponownie",
   worktree: {
     loading: "Ładowanie",
     empty: "Folder jest pusty",

src/shared/i18n/locales/pt-BR/chat.ts

@@ -82,6 +82,8 @@ export default {
     version: "Mostrar a versão do Hermes",
   },
   queuedCancel: "Remover da fila",
+  copyMessage: "Copiar mensagem",
+  regenerate: "Regenerar",
   worktree: {
     loading: "Carregando",
     empty: "A pasta está vazia",

src/shared/i18n/locales/pt-PT/chat.ts

@@ -94,6 +94,8 @@ export default {
   queued:
     "{{count}} mensagem(ns) em fila — serão enviadas quando o agente terminar",
   queuedCancel: "Remover da fila",
+  copyMessage: "Copiar mensagem",
+  regenerate: "Regenerar",
   worktree: {
     loading: "A carregar",
     empty: "A pasta está vazia",

src/shared/i18n/locales/tr/chat.ts

@@ -105,6 +105,8 @@ export default {
   },
   queued: "{{count}} mesaj sırada — ajan işini bitirince gönderilecek",
   queuedCancel: "Sıradan kaldır",
+  copyMessage: "Mesajı kopyala",
+  regenerate: "Yeniden oluştur",
   worktree: {
     loading: "Yükleniyor",
     empty: "Klasör boş",

src/shared/i18n/locales/zh-CN/chat.ts

@@ -78,6 +78,8 @@ export default {
     version: "查看 Hermes 版本",
   },
   queuedCancel: "从队列中移除",
+  copyMessage: "复制消息",
+  regenerate: "重新生成",
   worktree: {
     loading: "加载中",
     empty: "文件夹为空",

src/shared/i18n/locales/zh-TW/chat.ts

@@ -67,6 +67,8 @@ export default {
   },
   queued: "{{count}} 則訊息已排隊 — 代理完成後將自動傳送",
   queuedCancel: "從佇列中移除",
+  copyMessage: "複製訊息",
+  regenerate: "重新生成",
   worktree: {
     loading: "載入中",
     empty: "資料夾是空的",