diff --git a/src/cli.ts b/src/cli.ts
index 88c6652..d9223cf 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -69,17 +69,40 @@ cli.command("discuss", "讨论阶段").action(async () => {
   console.log(prompt);
 });
 
-cli.command("plan <change-name>", "规划阶段").action(
-  async (changeName: string) => {
+cli.command("plan <change-name> <document-name>", "规划阶段").action(
+  async (changeName: string, documentName: string) => {
     const root = requireProjectRoot();
-    await mkdir(getChangeDir(root, changeName), { recursive: true });
     const config = await loadConfig(root);
-    const plan = config.stages.plan;
-    if (!plan) throw new Error("plan 阶段未配置");
-    for (const doc of plan.documents) {
-      const prompt = await assemblePlanPrompt(config, root, changeName, doc.name);
-      console.log(prompt);
+    const planDocs = config.stages.plan?.documents;
+    if (!planDocs || !planDocs.find((d) => d.name === documentName)) {
+      throw new CommandError(
+        `文档 "${documentName}" 不在配置的 plan.documents 中`,
+        {
+          hint: `可用文档：${planDocs?.map((d) => d.name).join(", ") ?? "无"}`,
+        },
+      );
     }
+
+    const changeDir = getChangeDir(root, changeName);
+    await mkdir(changeDir, { recursive: true });
+
+    const doc = planDocs.find((d) => d.name === documentName)!;
+    if (doc.depend && doc.depend.length > 0) {
+      const missing = doc.depend.filter(
+        (dep) => !existsSync(join(changeDir, `${dep}.md`)),
+      );
+      if (missing.length > 0) {
+        throw new CommandError(
+          `文档 "${documentName}" 的前置依赖未满足：${missing.map((d) => `${d}.md`).join("、")} 尚未完成`,
+          {
+            hint: `请先完成依赖文档：rune plan ${changeName} ${missing[0]}`,
+          },
+        );
+      }
+    }
+
+    const prompt = await assemblePlanPrompt(config, root, changeName, documentName);
+    console.log(prompt);
   },
 );