diff --git a/src/core/assembler.ts b/src/core/assembler.ts
index 1c43cdc..9bbff88 100644
--- a/src/core/assembler.ts
+++ b/src/core/assembler.ts
@@ -4,7 +4,7 @@ import { join } from "node:path";
 import type { RuneConfig } from "../types.ts";
 import { CommandError } from "../cli/errors.ts";
 import { getChangeDir } from "./config.ts";
-import { parseTasks } from "./task-parser.ts";
+import { parseTasks, validateTaskFormat } from "./task-parser.ts";
 import { applyCommandPrefix, getPmPrefix } from "./pm.ts";
 
 export function assembleDiscussPrompt(config: RuneConfig): string {
@@ -85,6 +85,10 @@ export async function assembleBuildPrompt(
     });
   }
 
+  if (!config.metadata?.tracked) {
+    return applyCommandPrefix(build.prompt, config);
+  }
+
   const changeDir = getChangeDir(projectRoot, changeName);
   const taskPath = join(changeDir, "task.md");
 
@@ -98,6 +102,8 @@ export async function assembleBuildPrompt(
     });
   }
 
+  validateTaskFormat(taskContent);
+
   const tasks = parseTasks(taskContent);
   const pendingTasks = tasks.filter((t) => !t.checked);
 
diff --git a/tests/core/assembler.test.ts b/tests/core/assembler.test.ts
index 2a2eb6d..d87adba 100644
--- a/tests/core/assembler.test.ts
+++ b/tests/core/assembler.test.ts
@@ -152,6 +152,48 @@ describe("assembleBuildPrompt", () => {
       expect(e.hint).toContain("plan nonexistent");
     }
   });
+
+  it("tracked=false 时只输出通用提示词", async () => {
+    const config: RuneConfig = {
+      stages: { build: { prompt: "按规划文档逐步实现功能" } },
+      metadata: { tracked: false },
+    };
+    const prompt = await assembleBuildPrompt(config, TMP_DIR, "user-auth");
+    expect(prompt).toBe("按规划文档逐步实现功能");
+  });
+
+  it("tracked=true 且 task.md 格式不合法时抛错", async () => {
+    const changeDir = join(TMP_DIR, ".rune", "changes", "user-auth");
+    await mkdir(changeDir, { recursive: true });
+    await writeFile(join(changeDir, "task.md"), "# 标题\n无 checkbox");
+    const config: RuneConfig = {
+      stages: { build: { prompt: "构建阶段" } },
+      metadata: { tracked: true },
+    };
+    try {
+      await assembleBuildPrompt(config, TMP_DIR, "user-auth");
+      expect.unreachable();
+    } catch (e: any) {
+      expect(e.message).toContain("task.md");
+      expect(e.message).toContain("checkbox");
+    }
+  });
+
+  it("tracked=true 且 task.md 有空 checkbox 文本时抛错", async () => {
+    const changeDir = join(TMP_DIR, ".rune", "changes", "user-auth");
+    await mkdir(changeDir, { recursive: true });
+    await writeFile(join(changeDir, "task.md"), "- [ ] \n- [x] 有内容");
+    const config: RuneConfig = {
+      stages: { build: { prompt: "构建阶段" } },
+      metadata: { tracked: true },
+    };
+    try {
+      await assembleBuildPrompt(config, TMP_DIR, "user-auth");
+      expect.unreachable();
+    } catch (e: any) {
+      expect(e.message).toContain("checkbox");
+    }
+  });
 });
 
 describe("assembleArchivePrompt", () => {
@@ -187,7 +229,7 @@ describe("命令前缀替换", () => {
   it("assembleBuildPrompt 错误提示使用动态前缀", async () => {
     const config: RuneConfig = {
       stages: { build: { prompt: "构建阶段" } },
-      metadata: { command: "pnpx @lanyuanxiaoyao/rune" },
+      metadata: { command: "pnpx @lanyuanxiaoyao/rune", tracked: true },
     };
     try {
       await assembleBuildPrompt(config, TMP_DIR, "nonexistent-build");