diff --git a/apps/api/src/services/platform_operator_service.py b/apps/api/src/services/platform_operator_service.py
index a4cd1d90..92573af4 100644
--- a/apps/api/src/services/platform_operator_service.py
+++ b/apps/api/src/services/platform_operator_service.py
@@ -401,7 +401,7 @@ async def list_callback_replies(
         total = count_result.scalar_one()
         rows_result = await db.execute(list_sql, params)
         rows = list(rows_result.mappings().all())
-        summary = await _fetch_callback_reply_audit_summary(
+        audit_summary = await _fetch_callback_reply_audit_summary(
             db,
             project_id=project_id or "awoooi",
         )
@@ -446,22 +446,22 @@ async def list_callback_replies(
             item["awooop_status_chain"] = chain
 
         summary_cache_key = (item_project_id, incident_id)
-        summary = km_completion_summary_cache.get(summary_cache_key)
-        if summary is None:
-            summary = await _fetch_km_stale_completion_summary_for_incident(
+        km_summary = km_completion_summary_cache.get(summary_cache_key)
+        if km_summary is None:
+            km_summary = await _fetch_km_stale_completion_summary_for_incident(
                 project_id=item_project_id,
                 incident_id=incident_id,
                 queue_cache=km_completion_queue_cache,
             )
-            km_completion_summary_cache[summary_cache_key] = summary
-        item["km_stale_completion_summary"] = summary
+            km_completion_summary_cache[summary_cache_key] = km_summary
+        item["km_stale_completion_summary"] = km_summary
 
     return {
         "items": items,
         "total": total,
         "page": page,
         "per_page": per_page,
-        "summary": summary,
+        "summary": audit_summary,
     }
 
 
diff --git a/apps/api/tests/test_awooop_operator_timeline_labels.py b/apps/api/tests/test_awooop_operator_timeline_labels.py
index 1c44f895..4b6dbe9f 100644
--- a/apps/api/tests/test_awooop_operator_timeline_labels.py
+++ b/apps/api/tests/test_awooop_operator_timeline_labels.py
@@ -1,4 +1,5 @@
 import asyncio
+import inspect
 from datetime import datetime
 from decimal import Decimal
 from types import SimpleNamespace
@@ -706,6 +707,15 @@ def test_list_callback_replies_response_preserves_callback_evidence() -> None:
     assert dumped["summary"]["snapshot_status"] == "not_captured"
 
 
+def test_list_callback_replies_keeps_audit_summary_separate_from_km_summary() -> None:
+    source = inspect.getsource(platform_operator_service.list_callback_replies)
+
+    assert "audit_summary = await _fetch_callback_reply_audit_summary" in source
+    assert '"summary": audit_summary' in source
+    assert "km_summary = km_completion_summary_cache.get" in source
+    assert 'item["km_stale_completion_summary"] = km_summary' in source
+
+
 def test_callback_reply_audit_summary_marks_missing_snapshots() -> None:
     summary = _callback_reply_audit_summary_from_row(
         {
diff --git a/docs/LOGBOOK.md b/docs/LOGBOOK.md
index 64aaa7cd..e58e8553 100644
--- a/docs/LOGBOOK.md
+++ b/docs/LOGBOOK.md
@@ -20268,6 +20268,24 @@ pnpm --dir apps/web lint -- --file 'src/app/[locale]/awooop/runs/page.tsx'
 NEXT_PUBLIC_API_URL=https://awoooi.wooo.work pnpm --dir apps/web run build
 ```
 
+**T183b production smoke hotfix**：
+
+- 首次 production smoke `/api/v1/platform/runs/callback-replies?project_id=awoooi&per_page=2` 回傳 HTTP 500。
+- root cause：`list_callback_replies()` 的 API 頂層 coverage `summary` 被每筆 callback event 的 KM completion `summary` 區域變數覆蓋，FastAPI response validation 收到 `km_stale_owner_review_completion_callback_summary_v1`，因此不符合 `telegram_callback_reply_audit_summary_v1` schema。
+- 修正：
+  - API 頂層 coverage 改名為 `audit_summary`。
+  - 每筆事件的 KM completion summary 改名為 `km_summary`。
+  - response 固定回傳 `"summary": audit_summary`。
+  - 新增 regression test 防止 audit summary / KM summary 再次 shadowing。
+- hotfix local validation：
+
+```text
+python3 -m py_compile apps/api/src/services/platform_operator_service.py apps/api/tests/test_awooop_operator_timeline_labels.py
+git diff --check
+PYTHONPATH=. DATABASE_URL='postgresql+asyncpg://test:test@localhost/test' /Users/ogt/.pyenv/shims/pytest tests/test_awooop_operator_timeline_labels.py -q
+  52 passed in 0.80s
+```
+
 **目前整體進度**：
 
 - AwoooP 告警可觀測鏈：約 99.52%。