diff --git a/scripts/persona-lib.mjs b/scripts/persona-lib.mjs
index a3c460e..9c95a96 100644
--- a/scripts/persona-lib.mjs
+++ b/scripts/persona-lib.mjs
@@ -1967,6 +1967,33 @@ export function roomRepeat(room, speaker, text, opts = {}) {
   return findRepeat(rows, text, opts);
 }
 
+/**
+ * 這句台詞是不是把心裡話搬上台面了。
+ *
+ * 心裡話外流有兩種：一種是別的人格去讀你的檔案（那個 hook 早就擋死了），
+ * 另一種比較難防——**你自己把心裡想的原封不動講出來**。劇場模式尤其危險，
+ * 因為那裡只有台詞，別的人格看得到的就只有你說出口的東西。
+ *
+ * 「台詞不可以是心裡話的摘要」原本只是寫在規則裡靠自律，這裡把它變成機械檢查：
+ * 跟最近的心裡話太像就擋下來。害羞的人格更要擋——他們心裡那句才是真的。
+ */
+export const INNER_LEAK_THRESHOLD = 0.62;
+export const INNER_LEAK_WINDOW = 12;
+
+export function innerLeak(slug, text, { threshold = INNER_LEAK_THRESHOLD } = {}) {
+  const norm = normalizeSpeech(text);
+  if (norm.length < REPEAT_MIN_CHARS) return null;
+  let best = null;
+  for (const row of readJsonl(innerPath(slug), INNER_LEAK_WINDOW)) {
+    const score = similarity(text, row.text || "");
+    if (score < threshold) continue;
+    if (!best || score > best.similarity) {
+      best = { similarity: score, at: row.ts, kind: row.kind || "infer", text: String(row.text || "").slice(0, 120) };
+    }
+  }
+  return best;
+}
+
 /** 心裡話：只進自己的 inner.jsonl，永遠不回顯給使用者。 */
 export function recordInner(slug, text, { kind = "infer", room = null } = {}) {
   const entry = { ts: nowIso(), kind, room, text: String(text ?? "").slice(0, 1200) };
diff --git a/scripts/persona.mjs b/scripts/persona.mjs
index 944a39e..7379d6d 100644
--- a/scripts/persona.mjs
+++ b/scripts/persona.mjs
@@ -1361,6 +1361,18 @@ commands.room = ({ flags, positional }) => {
           "挑最想說的那一兩句就好，剩下的寫進心裡話。（真的需要長台詞才加 `--force`。）",
       );
     }
+    // 台詞不可以是心裡話搬上台面：劇場模式裡別的人格只看得到你說出口的東西，
+    // 心裡話外流最可能的路徑就是你自己把它講出來。
+    if (speakerRole !== "guest" && pl.personaExists(speaker)) {
+      const leak = pl.innerLeak(speaker, text);
+      if (leak && !flags.force) {
+        die(
+          `這句跟你剛才的心裡話太像了（${leak.similarity}）：「${leak.text.slice(0, 40)}…」。` +
+            "心裡話是只有你自己知道的東西——說出口的那句應該是你**決定要讓他聽到**的版本，" +
+            "不是把心裡那句唸出來。（真的要講開才加 `--force`。）",
+        );
+      }
+    }
     // 短句、日常話、講完不解釋、不說 AI 才會說的話——講話的樣子也擋在 CLI 裡，不靠自律。
     const lint = pl.speechBlockers(text);
     if (lint.length && !flags.force) {
diff --git a/scripts/selftest.mjs b/scripts/selftest.mjs
index 4ac28f7..a13c2b7 100644
--- a/scripts/selftest.mjs
+++ b/scripts/selftest.mjs
@@ -1387,6 +1387,35 @@ check("sleeper 型別存在且宣告了唯讀工具限制", (() => {
     md.includes("回傳值裡不得出現任何記憶內容");
 })());
 
+console.log("\n劇場模式：心裡話不能外流");
+{
+  const S_INNER = "sess-inner-8888";
+  cli(["load", "--persona", "alpha", "--session", S_INNER, "--takeover"]);
+  const room3 = JSON.parse(cli(["invite", "--session", S_INNER, "--guest", "beta", "--topic", "心裡話測試", "--json"]).stdout).room;
+  cli(["think", "--persona", "alpha", "--session", S_INNER, "--text", "我其實一直在等他先開口問我那件事"]);
+  const leak = cli(["room", "post", "--session", S_INNER, "--room", room3, "--as", "alpha",
+    "--text", "我其實一直在等你先開口問我那件事。"], { expectOk: false });
+  check("台詞跟心裡話太像 → room post 擋下（心裡話不能搬上台面）",
+    leak.status !== 0 && leak.stderr.includes("心裡話"), leak.stderr.slice(0, 160));
+  check("--force 仍可放行（真的要講開的時候）",
+    cli(["room", "post", "--session", S_INNER, "--room", room3, "--as", "alpha",
+      "--text", "我其實一直在等你先開口問我那件事。", "--force"]).status === 0);
+  check("換句話、講別的就過得去",
+    cli(["room", "post", "--session", S_INNER, "--room", room3, "--as", "alpha",
+      "--text", "外面雨停了。要不要走走？"]).status === 0);
+  // 逐字稿裡只有說出口的東西，沒有任何心裡話的欄位
+  const rows = pl.roomRead(room3, 20);
+  check("聊天室逐字稿不含心裡話欄位",
+    rows.length > 0 && rows.every((r) => !("inner" in r) && !("think" in r)), JSON.stringify(Object.keys(rows[0] || {})));
+  check("別的人格讀不到你的 inner.jsonl（hook 擋）",
+    guard({ session_id: S_OTHER, tool_name: "Read",
+      tool_input: { file_path: `${H}/alpha/state/inner.jsonl` } }) === "deny");
+  check("別的人格也不能用 grep 掃出來",
+    guard({ session_id: S_OTHER, tool_name: "Grep", tool_input: { path: `${H}/alpha/state` } }) === "deny");
+  cli(["leave", "--session", S_INNER, "--guest", "beta"]);
+  cli(["release", "--session", S_INNER]);
+}
+
 console.log(`\n${"=".repeat(60)}\n通過 ${passed} 項，失敗 ${failed} 項　→　${failed === 0 ? "全部通過 ✅" : "有測試失敗 ❌"}`);
 console.log(`（暫存倉庫留在 ${STORE}，可自行刪除）`);
 process.exit(failed ? 1 : 0);