fix: guard TTS after markdown stripping (openclaw#13237) thanks @danielwanwx

src/tts/tts.test.ts

@@ -471,6 +471,31 @@ describe("tts", () => {
       process.env.OPENCLAW_TTS_PREFS = prevPrefs;
     });
 
+    it("skips auto-TTS when markdown stripping leaves text too short", async () => {
+      const prevPrefs = process.env.OPENCLAW_TTS_PREFS;
+      process.env.OPENCLAW_TTS_PREFS = `/tmp/tts-test-${Date.now()}.json`;
+      const originalFetch = globalThis.fetch;
+      const fetchMock = vi.fn(async () => ({
+        ok: true,
+        arrayBuffer: async () => new ArrayBuffer(1),
+      }));
+      globalThis.fetch = fetchMock as unknown as typeof fetch;
+
+      const payload = { text: "### **bold**" };
+      const result = await maybeApplyTtsToPayload({
+        payload,
+        cfg: baseCfg,
+        kind: "final",
+        inboundAudio: true,
+      });
+
+      expect(result).toBe(payload);
+      expect(fetchMock).not.toHaveBeenCalled();
+
+      globalThis.fetch = originalFetch;
+      process.env.OPENCLAW_TTS_PREFS = prevPrefs;
+    });
+
     it("attempts auto-TTS when inbound audio gating is on and the message is audio", async () => {
       const prevPrefs = process.env.OPENCLAW_TTS_PREFS;
       process.env.OPENCLAW_TTS_PREFS = `/tmp/tts-test-${Date.now()}.json`;

src/tts/tts.ts

@@ -1522,7 +1522,11 @@ export async function maybeApplyTtsToPayload(params: {
     }
   }
 
-  textForAudio = stripMarkdown(textForAudio); // strip markdown for TTS (### → "hashtag" etc.)
+  textForAudio = stripMarkdown(textForAudio).trim(); // strip markdown for TTS (### → "hashtag" etc.)
+  if (textForAudio.length < 10) {
+    return nextPayload;
+  }
+
   const ttsStart = Date.now();
   const result = await textToSpeech({
     text: textForAudio,