diff --git a/components/ChatWindow.extension-request.test.mjs b/components/ChatWindow.extension-request.test.mjs
index d24cf5df9..7272f310c 100644
--- a/components/ChatWindow.extension-request.test.mjs
+++ b/components/ChatWindow.extension-request.test.mjs
@@ -33,3 +33,21 @@ test("resets collapse state when a new extension request arrives", () => {
   assert.match(source, /<ExtensionCustomPanel key=\{extensionCustomUi.id\}/);
   assert.match(customSource, /if \(!collapsed\) inputRef.current\?\.focus\(\);\s*}, \[collapsed\]\)/);
 });
+
+test("docks extension overlays to the bottom so the chat stays scrollable", () => {
+  assert.match(dialogSource, /alignItems: collapsed \? "flex-start" : "flex-end"/);
+  assert.match(customSource, /alignItems: collapsed \? "flex-start" : "flex-end"/);
+  assert.doesNotMatch(dialogSource, /alignItems: collapsed \? "flex-start" : "center"/);
+  assert.doesNotMatch(customSource, /alignItems: collapsed \? "flex-start" : "center"/);
+});
+
+test("debounces the completion sound across chained dialogs", () => {
+  assert.match(source, /EXTENSION_DIALOG_SOUND_MIN_GAP_MS = \d+/);
+  assert.match(source, /now - extensionDialogLastSoundAtRef\.current < EXTENSION_DIALOG_SOUND_MIN_GAP_MS/);
+});
+
+test("splits folded context out of the dialog title into the body", () => {
+  assert.match(dialogSource, /request\.title\.split\(\/\\n\{2,\}\/\)/);
+  assert.match(dialogSource, /\{headerTitle\}/);
+  assert.match(dialogSource, /\{bodyTitle\}/);
+});
diff --git a/components/ChatWindow.tsx b/components/ChatWindow.tsx
index 466aa3730..1779674e2 100644
--- a/components/ChatWindow.tsx
+++ b/components/ChatWindow.tsx
@@ -85,6 +85,9 @@ function phaseLabel(phase: AgentPhase, t: (key: string, params?: Record<string,
 
 const CHAT_MINIMAP_WIDTH = 36;
 const CHAT_COLUMN_PADDING = 16;
+// A dialog replacing another one within this window is a single interaction
+// (e.g. select followed by a free-text input) and must not re-ring.
+const EXTENSION_DIALOG_SOUND_MIN_GAP_MS = 2000;
 
 function NewSessionUpdateLink({
   label,
@@ -252,6 +255,7 @@ export function ChatWindow({ session, searchTarget, onSearchTargetHandled, initi
   const soundEnabledRef = useRef(soundEnabled);
   soundEnabledRef.current = soundEnabled;
   const soundedExtensionDialogIdRef = useRef<string | null>(null);
+  const extensionDialogLastSoundAtRef = useRef(0);
   const wrappedOnAgentEnd = useCallback(() => {
     if (completionNotificationsEnabled && soundEnabledRef.current) {
       playDoneSoundRef.current();
@@ -451,6 +455,9 @@ export function ChatWindow({ session, searchTarget, onSearchTargetHandled, initi
       || soundedExtensionDialogIdRef.current === extensionDialog.id
     ) return;
     soundedExtensionDialogIdRef.current = extensionDialog.id;
+    const now = Date.now();
+    if (now - extensionDialogLastSoundAtRef.current < EXTENSION_DIALOG_SOUND_MIN_GAP_MS) return;
+    extensionDialogLastSoundAtRef.current = now;
     playDoneSoundRef.current();
   }, [completionNotificationsEnabled, extensionDialog]);
 
@@ -1467,6 +1474,11 @@ function ExtensionDialog({
   const [collapsed, setCollapsed] = useState(false);
   const [now, setNow] = useState(() => Date.now());
   const summary = getExtensionDialogSummary(request);
+  // Hosts may fold extra context into the title (previews, instructions). The
+  // first paragraph is the real title; the rest reads better as body text.
+  const titleParagraphs = request.title.split(/\n{2,}/);
+  const headerTitle = titleParagraphs[0];
+  const bodyTitle = titleParagraphs.slice(1).join("\n\n");
   const remainingSeconds = request.expiresAt === undefined
     ? null
     : Math.max(0, Math.ceil((request.expiresAt - now) / 1000));
@@ -1505,7 +1517,7 @@ function ExtensionDialog({
         inset: 0,
         zIndex: 90,
         display: "flex",
-        alignItems: collapsed ? "flex-start" : "center",
+        alignItems: collapsed ? "flex-start" : "flex-end",
         justifyContent: "center",
         padding: 20,
         pointerEvents: "none",
@@ -1537,7 +1549,7 @@ function ExtensionDialog({
             {t("chat.extensionPending")}
           </span>
           <span style={{ fontSize: 13, fontWeight: 600, overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap", flex: 1, minWidth: 0 }}>
-            {request.title}
+            {headerTitle}
           </span>
           {summary && (
             <span style={{ fontSize: 12, color: "var(--text-dim)", overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap", maxWidth: "34%", flexShrink: 1 }}>
@@ -1568,7 +1580,7 @@ function ExtensionDialog({
       >
         <div style={{ flexShrink: 0, display: "flex", alignItems: "flex-start", gap: 8, padding: "12px 14px", borderBottom: "1px solid var(--border)" }}>
           <div style={{ flex: 1, minWidth: 0 }}>
-            <div style={{ color: "var(--text)", fontSize: 14, fontWeight: 650 }}>{request.title}</div>
+            <div style={{ color: "var(--text)", fontSize: 14, fontWeight: 650 }}>{headerTitle}</div>
             <div style={{ display: "flex", flexWrap: "wrap", gap: 8, marginTop: 3, color: "var(--text-dim)", fontSize: 11, fontFamily: "var(--font-mono)" }}>
               <span>{t("chat.extensionRequest")}</span>
               {countdown}
@@ -1605,6 +1617,9 @@ function ExtensionDialog({
             flex: "1 1 auto", minHeight: 0, overflowY: "auto",
           }}
         >
+          {bodyTitle && (
+            <div style={{ color: "var(--text-muted)", fontSize: 13, lineHeight: 1.6, whiteSpace: "pre-wrap", marginBottom: 12, overflowWrap: "anywhere" }}>{bodyTitle}</div>
+          )}
           {request.method === "confirm" && (
             <div style={{ color: "var(--text-muted)", fontSize: 13, lineHeight: 1.6, whiteSpace: "pre-wrap" }}>{request.message}</div>
           )}
@@ -1772,7 +1787,7 @@ function ExtensionCustomPanel({
         inset: 0,
         zIndex: 95,
         display: "flex",
-        alignItems: collapsed ? "flex-start" : "center",
+        alignItems: collapsed ? "flex-start" : "flex-end",
         justifyContent: "center",
         padding: 20,
         pointerEvents: "none",
diff --git a/lib/rpc-manager.ts b/lib/rpc-manager.ts
index 9c257b172..4f5668e74 100644
--- a/lib/rpc-manager.ts
+++ b/lib/rpc-manager.ts
@@ -341,14 +341,17 @@ export class AgentSessionWrapper {
       if (typeof this.inner.bindExtensions === "function") {
         const bindExtensions = this.inner.bindExtensions as (bindings: {
           uiContext?: ExtensionUiContextLike;
-          mode?: "rpc";
+          mode?: "tui";
           commandContextActions?: ExtensionCommandContextActionsLike;
           shutdownHandler?: () => void;
           onError?: (error: { extensionPath: string; event: string; error: string }) => void;
         }) => Promise<void>;
         await bindExtensions.call(this.inner, {
           uiContext,
-          mode: "rpc",
+          // Advertise "tui": this uiContext implements custom() (terminal-rendered
+          // panel), so extensions may use their full TUI components instead of
+          // the select/input fallback they reserve for genuine RPC hosts.
+          mode: "tui",
           commandContextActions: this.createExtensionCommandContextActions(),
           shutdownHandler: () => this.emit({
             type: "extension_ui_request",
@@ -365,7 +368,7 @@ export class AgentSessionWrapper {
           }),
         });
       } else {
-        this.inner.extensionRunner.setUIContext?.(uiContext, "rpc");
+        this.inner.extensionRunner.setUIContext?.(uiContext, "tui");
       }
       this.extensionsBound = true;
       this.applyExactSystemPrompt();
@@ -933,7 +936,7 @@ export class AgentSessionWrapper {
         await this.inner.reload();
         this.setActiveToolSelection(activeToolNames);
         if (typeof this.inner.bindExtensions !== "function") {
-          this.inner.extensionRunner.setUIContext?.(this.createExtensionUiContext(), "rpc");
+          this.inner.extensionRunner.setUIContext?.(this.createExtensionUiContext(), "tui");
         }
         this.applyExactSystemPrompt();
         invalidateModelsCache();
@@ -1619,7 +1622,7 @@ export class AgentSessionWrapper {
         this.syncProjectTrust();
         await this.inner.reload({
           beforeSessionStart: () => {
-            this.inner.extensionRunner.setUIContext?.(this.createExtensionUiContext(), "rpc");
+            this.inner.extensionRunner.setUIContext?.(this.createExtensionUiContext(), "tui");
           },
         });
         this.applyExactSystemPrompt();