diff --git a/bridge/server.py b/bridge/server.py
index 5f46c0d..c68b798 100644
--- a/bridge/server.py
+++ b/bridge/server.py
@@ -197,7 +197,10 @@ def synthesize(text: str) -> Optional[bytes]:
         return None
     buf = io.BytesIO()
     with wave.open(buf, "wb") as wf:
-        _piper_voice.synthesize(text, wf)
+        # piper-tts API: synthesize_wav(text, wav_file) writes a full WAV;
+        # plain synthesize() returns AudioChunks and takes a SynthesisConfig
+        # (NOT a wav file) as its 2nd arg.
+        _piper_voice.synthesize_wav(text, wf)
     return buf.getvalue()
 
 
diff --git a/docker/run-bot.sh b/docker/run-bot.sh
index a67c9a8..1ad801b 100755
--- a/docker/run-bot.sh
+++ b/docker/run-bot.sh
@@ -7,8 +7,11 @@
 set -e
 cd /app/bot
 
-if [ -z "${DISCORD_BOT_TOKEN:-}" ]; then
-  echo "[bot] DISCORD_BOT_TOKEN 미설정 — 봇 대기 중. .env에 토큰을 넣고 'docker compose up -d' 하면 시작됩니다."
+# The bot needs all three to log in AND register slash commands. If any is
+# missing, wait instead of crash-looping (config.ts throws on a missing var).
+if [ -z "${DISCORD_BOT_TOKEN:-}" ] || [ -z "${DISCORD_APP_ID:-}" ] || [ -z "${DISCORD_GUILD_ID:-}" ]; then
+  echo "[bot] DISCORD_BOT_TOKEN/DISCORD_APP_ID/DISCORD_GUILD_ID 중 일부 미설정 — 봇 대기 중."
+  echo "[bot] .env에 셋 다 넣고 'docker compose up -d' 하면 시작됩니다."
   echo "[bot] (그동안 VNC 데스크톱 / 브릿지 / Ollama 는 정상 동작합니다.)"
   exec sleep infinity
 fi