diff --git a/.pi/extensions/goal-driven-loop/ui-prompts.ts b/.pi/extensions/goal-driven-loop/ui-prompts.ts
new file mode 100644
index 0000000..3f8355e
--- /dev/null
+++ b/.pi/extensions/goal-driven-loop/ui-prompts.ts
@@ -0,0 +1,106 @@
+/**
+ * UI prompts for goal-driven-loop.
+ *
+ * Wraps Pi's UI methods with timed auto-defaults to avoid
+ * blocking the user forever.
+ */
+
+export interface UIContext {
+  hasUI: boolean;
+  select: (
+    title: string,
+    options: string[],
+    opts?: { timeout?: number }
+  ) => Promise<string | undefined>;
+  notify: (message: string, level?: "info" | "warn" | "error") => void;
+  confirm: (
+    title: string,
+    message: string,
+    opts?: { timeout?: number }
+  ) => Promise<boolean>;
+}
+
+const DEFAULT_TIMEOUT_MS = 10_000;
+const STAGNATION_NOTIFY_THRESHOLD = 2;
+
+/**
+ * Prompt the user to resolve a stale goal state.
+ * Returns the choice or undefined on timeout.
+ * Auto-default: "continue"
+ */
+export async function promptStaleState(
+  ctx: UIContext
+): Promise<"continue" | "replace" | "abandon" | undefined> {
+  if (!ctx.hasUI) {
+    return "continue";
+  }
+
+  const choice = await ctx.select(
+    "已有目标在进行中",
+    ["继续当前目标", "替换为新目标", "放弃当前目标"],
+    { timeout: DEFAULT_TIMEOUT_MS }
+  );
+
+  switch (choice) {
+    case "继续当前目标":
+      return "continue";
+    case "替换为新目标":
+      return "replace";
+    case "放弃当前目标":
+      return "abandon";
+    default:
+      return "continue";
+  }
+}
+
+/**
+ * Notify the user that the goal is being delegated to comet.
+ */
+export function notifyCoarseGrainedDelegation(
+  ctx: UIContext,
+  goal: string
+): void {
+  if (!ctx.hasUI) return;
+  ctx.notify(
+    `目标粒度较大，已委托给 comet 全流程处理：${goal}`,
+    "info"
+  );
+}
+
+/**
+ * Notify the user about mid-loop granularity upgrade.
+ */
+export function notifyMidLoopUpgrade(ctx: UIContext, goal: string): void {
+  if (!ctx.hasUI) return;
+  ctx.notify(
+    `执行中发现目标比预期复杂，已升级到 comet：${goal}`,
+    "info"
+  );
+}
+
+/**
+ * Notify the user about stagnation that auto-recovery couldn't fix.
+ * Called after STAGNATION_NOTIFY_THRESHOLD auto-recovery attempts.
+ */
+export function notifyStagnation(
+  ctx: UIContext,
+  goal: string,
+  passedCount: number,
+  totalCount: number,
+  iteration: number
+): void {
+  if (!ctx.hasUI) return;
+  ctx.notify(
+    `目标停滞：${goal} (${passedCount}/${totalCount} 通过, 第 ${iteration} 轮)。自动策略调整未奏效，请人工介入。`,
+    "warn"
+  );
+}
+
+/**
+ * Check if we should notify the user about stagnation yet.
+ */
+export function shouldNotifyStagnation(
+  consecutiveStagnations: number
+): boolean {
+  return consecutiveStagnations > STAGNATION_NOTIFY_THRESHOLD;
+}