diff --git a/agent_reach/channels/xiaoyuzhou.py b/agent_reach/channels/xiaoyuzhou.py
index 5afee0e1a..ae8ffebc4 100644
--- a/agent_reach/channels/xiaoyuzhou.py
+++ b/agent_reach/channels/xiaoyuzhou.py
@@ -61,5 +61,22 @@ def check(self, config=None):
                 "  2. 运行: agent-reach configure groq-key（隐藏输入）"
             )
 
+        # The shipped script invokes all three before it can produce a
+        # transcript. ffmpeg alone can be installed while ffprobe is absent.
+        missing = []
+        for tool, flag in (("ffprobe", "-version"), ("curl", "--version"), ("perl", "-v")):
+            tool_probe = probe_command(tool, [flag], timeout=10)
+            if tool_probe.status == "missing":
+                missing.append(tool)
+            elif not tool_probe.ok:
+                return "error", f"小宇宙转录工具 {tool} 无法执行，请修复该工具后重试"
+        if missing:
+            return "off", (
+                "小宇宙转录还缺少运行工具：" + "、".join(missing) + "。\n"
+                "  ffprobe 随 ffmpeg 安装；curl/perl 可通过系统包管理器安装。\n"
+                "  Ubuntu/Debian: apt install ffmpeg curl perl\n"
+                "  macOS: brew install ffmpeg curl perl"
+            )
+
         self.active_backend = "groq-whisper"
         return "ok", "完整可用（播客下载 + Whisper 转录）"
diff --git a/tests/test_xiaoyuzhou_runtime.py b/tests/test_xiaoyuzhou_runtime.py
new file mode 100644
index 000000000..6a9407fbc
--- /dev/null
+++ b/tests/test_xiaoyuzhou_runtime.py
@@ -0,0 +1,39 @@
+"""Probe real PATH executables before promising podcast transcription."""
+
+import os
+
+import pytest
+
+from agent_reach.channels.xiaoyuzhou import XiaoyuzhouChannel
+
+
+@pytest.mark.skipif(os.name == "nt", reason="native POSIX executable PATH fixture")
+@pytest.mark.parametrize(
+    "unusable,broken",
+    [("ffprobe", False), ("curl", False), ("perl", False), ("ffprobe", True), (None, False)],
+)
+def test_mandatory_script_tools_are_checked(tmp_path, monkeypatch, isolated_home, unusable, broken):
+    bins = tmp_path / "bin"
+    bins.mkdir()
+    for tool in ("ffmpeg", "ffprobe", "curl", "perl"):
+        if tool == unusable and not broken:
+            continue
+        executable = bins / tool
+        exit_code = 127 if tool == unusable else 0
+        executable.write_text(f"#!/bin/sh\nprintf 'test version\\n'\nexit {exit_code}\n")
+        executable.chmod(0o755)
+    script = isolated_home / ".agent-reach/tools/xiaoyuzhou/transcribe.sh"
+    script.parent.mkdir(parents=True)
+    script.write_text("#!/bin/bash\n", encoding="utf-8")
+    monkeypatch.setenv("PATH", str(bins))
+    monkeypatch.setenv("GROQ_API_KEY", "test-only-explicit-key")
+
+    channel = XiaoyuzhouChannel()
+    status, message = channel.check()
+    if unusable is None:
+        assert status == "ok"
+        assert channel.active_backend == "groq-whisper"
+    else:
+        assert status == ("error" if broken else "off")
+        assert unusable in message
+        assert channel.active_backend is None