diff --git a/apps/api/src/services/drift_interpreter.py b/apps/api/src/services/drift_interpreter.py
index 0ca8ef58..be930267 100644
--- a/apps/api/src/services/drift_interpreter.py
+++ b/apps/api/src/services/drift_interpreter.py
@@ -17,6 +17,7 @@ Drift Interpreter - Phase 25 P2 Config Drift Detection
 from __future__ import annotations
 
 import json
+import re
 from typing import TYPE_CHECKING
 
 import structlog
@@ -52,6 +53,58 @@ _INTENT_PROMPT_TEMPLATE = """你是 AWOOOI GitOps 守門員，請分析以下 K8
 """
 
 
+def _strip_think_blocks(text: str) -> str:
+    """移除 qwen/deepseek 類模型常見的 <think> 推理段。"""
+    return re.sub(r"<think>[\s\S]*?</think>", "", text, flags=re.IGNORECASE).strip()
+
+
+def _extract_first_json_object(text: str) -> dict | None:
+    """
+    從 LLM 回應中擷取第一個 JSON object。
+
+    Ollama qwen3/deepseek 常會在 JSON 前後加 `<think>` 或短句；這些文字不應
+    讓 drift intent 直接降級成 UNKNOWN。
+    """
+    cleaned = _strip_think_blocks(text)
+
+    candidates = [cleaned]
+    candidates.extend(match.group(1).strip() for match in re.finditer(r"```(?:json)?\s*([\s\S]+?)```", cleaned))
+
+    start = cleaned.find("{")
+    if start >= 0:
+        in_string = False
+        escaped = False
+        depth = 0
+        for idx, ch in enumerate(cleaned[start:], start=start):
+            if escaped:
+                escaped = False
+                continue
+            if ch == "\\":
+                escaped = True
+                continue
+            if ch == '"':
+                in_string = not in_string
+                continue
+            if in_string:
+                continue
+            if ch == "{":
+                depth += 1
+            elif ch == "}":
+                depth -= 1
+                if depth == 0:
+                    candidates.append(cleaned[start : idx + 1])
+                    break
+
+    for candidate in candidates:
+        try:
+            data = json.loads(candidate)
+        except Exception:
+            continue
+        if isinstance(data, dict):
+            return data
+    return None
+
+
 class NemotronDriftInterpreter:
     """
     使用 Nemotron 分析漂移意圖
@@ -135,19 +188,9 @@ class NemotronDriftInterpreter:
 
     def _parse_response(self, text: str) -> DriftInterpretation:
         """解析 Nemotron JSON 回應"""
-        try:
-            # 嘗試直接解析
-            data = json.loads(text)
-        except Exception:
-            try:
-                import re
-                match = re.search(r"```(?:json)?\s*([\s\S]+?)```", text)
-                if match:
-                    data = json.loads(match.group(1))
-                else:
-                    return self._unknown_result("無法解析 JSON")
-            except Exception:
-                return self._unknown_result("JSON 解析失敗")
+        data = _extract_first_json_object(text)
+        if data is None:
+            return self._unknown_result("無法解析 JSON")
 
         try:
             intent_str = data.get("intent", "unknown")
diff --git a/apps/api/tests/test_drift_interpreter_ollama_first.py b/apps/api/tests/test_drift_interpreter_ollama_first.py
index bf645701..3ce72932 100644
--- a/apps/api/tests/test_drift_interpreter_ollama_first.py
+++ b/apps/api/tests/test_drift_interpreter_ollama_first.py
@@ -40,3 +40,36 @@ async def test_drift_interpreter_declares_ollama_first_governance_lane(
     assert fake_openclaw.alert_context["enforce_ollama_first"] is True
     assert fake_openclaw.alert_context["task_type"] == "diagnose"
     assert fake_openclaw.alert_context["allow_gcp_heavy_model"] is True
+
+
+def test_drift_interpreter_strips_think_blocks_before_json_parse() -> None:
+    result = NemotronDriftInterpreter()._parse_response(
+        """
+        <think>先判斷 replicas 變化是否為 HPA。</think>
+        {
+          "intent": "automated_change",
+          "explanation": "replicas 變化通常是 HPA 自動調整",
+          "risk": "LOW",
+          "confidence": 0.72
+        }
+        """
+    )
+
+    assert result.intent == DriftIntent.AUTOMATED_CHANGE
+    assert result.risk == "LOW"
+    assert result.confidence == 0.72
+
+
+def test_drift_interpreter_extracts_json_from_markdown() -> None:
+    result = NemotronDriftInterpreter()._parse_response(
+        """
+        以下為判斷：
+        ```json
+        {"intent":"human_error","explanation":"欄位異常變更","risk":"MEDIUM","confidence":0.61}
+        ```
+        """
+    )
+
+    assert result.intent == DriftIntent.HUMAN_ERROR
+    assert result.risk == "MEDIUM"
+    assert result.confidence == 0.61
diff --git a/docs/LOGBOOK.md b/docs/LOGBOOK.md
index e472775c..0e3fa168 100644
--- a/docs/LOGBOOK.md
+++ b/docs/LOGBOOK.md
@@ -4047,7 +4047,8 @@ ruff check --select F401,F821,I001 apps/api/src/services/heartbeat_report_servic
 | Production image | `awoooi-api:2ef54ccc9462c5fb1f74ca4f5997fe9564c9418f` |
 | Live provider order | Drift Interpreter 單次 live 驗證顯示 `ollama_gcp_a → ollama_gcp_b → ollama_local → gemini` |
 | Live 實際 provider | `ollama_gcp_a` 成功，模型 `qwen3:14b`，tokens `269`，latency 約 `56.5s`，未觸發 Gemini |
-| 後續缺口 | 測試 prompt 回傳仍解析成 `unknown`，需另外強化 Drift Interpreter 的 JSON schema / correction retry；這不是費用路由問題 |
+| Drift JSON parser | 補上 `<think>...</think>` 移除、Markdown code fence JSON、首個 JSON object 擷取，避免 qwen3/deepseek 回應外包文字時直接降級成 `unknown` |
+| 後續缺口 | 若模型輸出欄位語義錯誤，仍需後續補 JSON schema / correction retry；這不是費用路由問題 |
 
 ### 驗證
 
@@ -4055,7 +4056,7 @@ ruff check --select F401,F821,I001 apps/api/src/services/heartbeat_report_servic
 DATABASE_URL='postgresql+asyncpg://test:test@localhost:5432/test' pytest \
   apps/api/tests/test_openclaw_alert_cloud_fallback_gate.py \
   apps/api/tests/test_drift_interpreter_ollama_first.py
-# 8 passed
+# 10 passed
 
 ruff check \
   apps/api/src/services/openclaw.py \