feat: implement clear context option in Plan Mode and update related prompts

docs/plan-mode.md

@@ -90,10 +90,11 @@ Plan Mode 的核心规则是**只规划，不动手**。例如以下操作是**
 | 选项 | 作用 |
 | ---- | ---- |
 | **1. implement this plan** | 退出 Plan Mode，自动发送实现指令，让 AI 开始按方案写代码 |
-| **2. stay in Plan mode** | 保持在 Plan Mode，继续修改或完善方案 |
-| **3. switch to Default mode** | 退出 Plan Mode，回到默认模式（不自动开始实现） |
+| **2. clear context and implement** | 保留当前会话，创建一个仅携带已确认方案的新会话，并在 Default mode 下开始实现 |
+| **3. stay in Plan mode** | 保持在 Plan Mode，继续修改或完善方案 |
+| **4. switch to Default mode** | 退出 Plan Mode，回到默认模式（不自动开始实现） |
 
-你可以用数字键 `1-3` 直接选择，也可以用 `↑/↓` 移动光标后按 `Enter` 确认。按 `Esc` 等同于选择 "stay in Plan mode"。
+你可以用数字键 `1-4` 直接选择，也可以用 `↑/↓` 移动光标后按 `Enter` 确认。按 `Esc` 等同于选择 "stay in Plan mode"。选择清除上下文后，原 Plan 会话仍可通过 `/resume` 恢复。新会话不会继承旧对话消息。
 
 ## Plan Mode 与 UpdatePlan 工具的区别
 

docs/plan-mode_en.md

@@ -90,10 +90,11 @@ After the plan is output, Deep Code automatically shows a choice dialog—no ext
 | Option | Effect |
 | ------ | ------ |
 | **1. implement this plan** | Leave Plan Mode and automatically send an implementation prompt so the AI starts coding |
-| **2. stay in Plan mode** | Stay in Plan Mode to continue refining the plan |
-| **3. switch to Default mode** | Leave Plan Mode and return to Default mode without starting implementation |
+| **2. clear context and implement** | Preserve the current session, create a new session carrying only the approved plan, and start implementing in Default mode |
+| **3. stay in Plan mode** | Stay in Plan Mode to continue refining the plan |
+| **4. switch to Default mode** | Leave Plan Mode and return to Default mode without starting implementation |
 
-You can press `1-3` to select directly, or use `↑/↓` to move the cursor and `Enter` to confirm. Pressing `Esc` is equivalent to choosing "stay in Plan mode."
+You can press `1-4` to select directly, or use `↑/↓` to move the cursor and `Enter` to confirm. Pressing `Esc` is equivalent to choosing "stay in Plan mode." After clearing context, the original Plan session remains available through `/resume`. The new session does not inherit its conversation messages.
 
 ## Plan Mode vs. UpdatePlan Tool
 

packages/cli/src/tests/prompt-input-keys.test.ts

@@ -23,6 +23,7 @@ import {
   buildInitPromptSubmission,
   buildPromptDraftFromSessionMessage,
   extractProposedPlan,
+  getClearContextImplementationPrompt,
   getImplementationPrompt,
   getPlanImplementationChoice,
   disableTerminalExtendedKeys,
@@ -181,6 +182,27 @@ test("getImplementationPrompt uses Chinese only above five full-width punctuatio
   assert.equal(getImplementationPrompt("，、；。；。"), "实现此方案。");
 });
 
+test("getClearContextImplementationPrompt carries the complete plan into a fresh context", () => {
+  const plan = "# 方案\n\n- 保留 `Markdown`\n- Verify tests";
+  const prompt = getClearContextImplementationPrompt(plan);
+
+  assert.equal(
+    prompt,
+    "A previous agent produced the plan below to accomplish the user's task. " +
+      "Implement the plan in a fresh context. Treat the plan as the source of " +
+      "user intent, re-read files as needed, and carry the work through " +
+      `implementation and verification.\n\n${plan}`
+  );
+});
+
+test("getPlanImplementationChoice maps all four number shortcuts", () => {
+  const key = { escape: false, return: false };
+  assert.equal(getPlanImplementationChoice("1", key, 0), "implement");
+  assert.equal(getPlanImplementationChoice("2", key, 0), "clear-context");
+  assert.equal(getPlanImplementationChoice("3", key, 0), "stay");
+  assert.equal(getPlanImplementationChoice("4", key, 0), "default");
+});
+
 test("getPlanImplementationChoice treats escape as staying in Plan Mode", () => {
   assert.equal(getPlanImplementationChoice("", { escape: true, return: false }, 0), "stay");
 });

packages/cli/src/ui/index.ts

@@ -18,8 +18,10 @@ export { AskUserQuestionPrompt, applyOtherAnswerEdit } from "./views/AskUserQues
 export {
   PlanImplementationPrompt,
   extractProposedPlan,
+  getClearContextImplementationPrompt,
   getImplementationPrompt,
   getPlanImplementationChoice,
+  type PlanImplementationChoice,
 } from "./views/PlanImplementationPrompt";
 export { MessageView } from "./components";
 export { parseDiffPreview } from "./components/MessageView/utils";

packages/cli/src/ui/views/App.tsx

@@ -20,7 +20,13 @@ import {
   formatAskUserQuestionAnswers,
 } from "../core/ask-user-question";
 import { PermissionPrompt, type PermissionPromptResult } from "./PermissionPrompt";
-import { PlanImplementationPrompt, extractProposedPlan, getImplementationPrompt } from "./PlanImplementationPrompt";
+import {
+  PlanImplementationPrompt,
+  extractProposedPlan,
+  getClearContextImplementationPrompt,
+  getImplementationPrompt,
+  type PlanImplementationChoice,
+} from "./PlanImplementationPrompt";
 import { buildExitSummaryText, buildPluginRateLimitHintText, buildResumeHintText } from "../exit-summary";
 import { RawMode, useRawModeContext } from "../contexts";
 import { renderMessageToStdout } from "../components/MessageView/utils";
@@ -561,13 +567,23 @@ function App({ projectRoot, initialPrompt, resumeSessionId, forkSessionId, onRes
   );
 
   const handlePlanImplementationChoice = useCallback(
-    (choice: "implement" | "stay" | "default") => {
+    (choice: PlanImplementationChoice) => {
       const proposedPlan = pendingPlanImplementation;
       setPendingPlanImplementation(null);
       if (choice === "stay") {
         return;
       }
       setPlanMode(false);
+      if (choice === "clear-context" && proposedPlan) {
+        void resetToWelcome().then(() => {
+          handleSubmit({
+            text: getClearContextImplementationPrompt(proposedPlan),
+            imageUrls: [],
+            planMode: false,
+          });
+        });
+        return;
+      }
       if (choice === "implement" && proposedPlan) {
         handleSubmit({
           text: getImplementationPrompt(proposedPlan),
@@ -576,7 +592,7 @@ function App({ projectRoot, initialPrompt, resumeSessionId, forkSessionId, onRes
         });
       }
     },
-    [handleSubmit, pendingPlanImplementation]
+    [handleSubmit, pendingPlanImplementation, resetToWelcome]
   );
 
   const handleExitShortcut = useCallback(() => {

packages/cli/src/ui/views/PlanImplementationPrompt.tsx

@@ -3,18 +3,25 @@ import { Box, Text } from "ink";
 import { useTerminalInput } from "../hooks";
 import type { InputKey } from "../hooks";
 
-type PlanImplementationChoice = "implement" | "stay" | "default";
+export type PlanImplementationChoice = "implement" | "clear-context" | "stay" | "default";
 
 type Props = {
   onSelect: (choice: PlanImplementationChoice) => void;
 };
 
 const CHOICES: Array<{ value: PlanImplementationChoice; label: string }> = [
   { value: "implement", label: "implement this plan" },
+  { value: "clear-context", label: "clear context and implement" },
   { value: "stay", label: "stay in Plan mode" },
   { value: "default", label: "switch to Default mode" },
 ];
 
+const CLEAR_CONTEXT_IMPLEMENTATION_PREFIX =
+  "A previous agent produced the plan below to accomplish the user's task. " +
+  "Implement the plan in a fresh context. Treat the plan as the source of " +
+  "user intent, re-read files as needed, and carry the work through " +
+  "implementation and verification.";
+
 /** Return only a complete proposed plan, so historical or partial tags cannot trigger the chooser. */
 export function extractProposedPlan(reply: string | null): string | null {
   if (!reply) {
@@ -29,6 +36,10 @@ export function getImplementationPrompt(plan: string): string {
   return fullWidthPunctuationCount > 5 ? "实现此方案。" : "Implement the plan.";
 }
 
+export function getClearContextImplementationPrompt(plan: string): string {
+  return `${CLEAR_CONTEXT_IMPLEMENTATION_PREFIX}\n\n${plan}`;
+}
+
 export function getPlanImplementationChoice(
   input: string,
   key: Pick<InputKey, "escape" | "return">,
@@ -37,7 +48,7 @@ export function getPlanImplementationChoice(
   if (key.escape) {
     return "stay";
   }
-  if (input && /^[1-3]$/.test(input)) {
+  if (input && /^[1-4]$/.test(input)) {
     return CHOICES[Number(input) - 1]!.value;
   }
   return key.return ? CHOICES[cursor]!.value : null;
@@ -81,7 +92,7 @@ export function PlanImplementationPrompt({ onSelect }: Props): React.ReactElemen
         ))}
       </Box>
       <Box marginTop={1}>
-        <Text dimColor>1-3 select · ↑/↓ move · Enter select</Text>
+        <Text dimColor>1-4 select · ↑/↓ move · Enter select</Text>
       </Box>
     </Box>
   );