diff --git a/apps/api/src/api/v1/stats.py b/apps/api/src/api/v1/stats.py
index ea1375df..6e582f0d 100644
--- a/apps/api/src/api/v1/stats.py
+++ b/apps/api/src/api/v1/stats.py
@@ -27,10 +27,20 @@ from fastapi import APIRouter, Depends, Query, WebSocket, WebSocketDisconnect
 from fastapi.responses import PlainTextResponse
 from pydantic import BaseModel, Field
 
-from src.services.stats_service import StatsService, get_stats_service
+from src.services.flywheel_stats_service import (
+    FlywheelStatsService,
+    get_flywheel_stats_service,
+)
 from src.services.k3s_monitor_service import K3sMonitorService, get_k3s_monitor_service
-from src.services.weekly_report_service import WeeklyReportService, get_weekly_report_service
-from src.services.flywheel_stats_service import FlywheelStatsService, get_flywheel_stats_service
+from src.services.report_generation_service import (
+    ReportGenerationService,
+    get_report_generation_service,
+)
+from src.services.stats_service import StatsService, get_stats_service
+from src.services.weekly_report_service import (
+    WeeklyReportService,
+    get_weekly_report_service,
+)
 
 router = APIRouter(prefix="/stats", tags=["Statistics"])
 
@@ -42,6 +52,7 @@ router = APIRouter(prefix="/stats", tags=["Statistics"])
 StatsServiceDep = Annotated[StatsService, Depends(get_stats_service)]
 K3sMonitorDep = Annotated[K3sMonitorService, Depends(get_k3s_monitor_service)]
 WeeklyReportDep = Annotated[WeeklyReportService, Depends(get_weekly_report_service)]
+DailyReportDep = Annotated[ReportGenerationService, Depends(get_report_generation_service)]
 
 
 # =============================================================================
@@ -367,6 +378,113 @@ class WeeklyReportResponse(BaseModel):
     formatted_preview: str = Field(default="", description="Telegram HTML no-send preview")
 
 
+class DailyReportPreviewResponse(BaseModel):
+    """日報 no-send preview 回應"""
+
+    report_date: str = Field(description="報告日期時間")
+    alert_total: int = Field(description="24 小時告警總數")
+    auto_repair_success: int = Field(description="自動修復成功次數")
+    auto_repair_failed: int = Field(description="自動修復失敗次數")
+    km_new_entries: int = Field(description="新增 KM 條目")
+    playbook_count: int = Field(description="活躍 PlayBook 數")
+    source_ok_count: int = Field(default=0, description="報表資料源可讀數")
+    source_total_count: int = Field(default=0, description="報表資料源總數")
+    source_confidence_percent: int = Field(default=0, description="報表資料源可信度")
+    source_gap_ids: list[str] = Field(default_factory=list, description="報表資料源缺口工作項")
+    formatted_preview: str = Field(default="", description="Telegram HTML no-send preview")
+
+
+class MonthlyReportPreviewResponse(BaseModel):
+    """月報 no-send preview 回應"""
+
+    report_month: str = Field(description="報告月份")
+    source_ok_count: int = Field(default=0, description="報表資料源可讀數")
+    source_total_count: int = Field(default=0, description="報表資料源總數")
+    source_confidence_percent: int = Field(default=0, description="報表資料源可信度")
+    source_gap_ids: list[str] = Field(default_factory=list, description="報表資料源缺口工作項")
+    no_send_preview_count: int = Field(default=0, description="no-send preview 數量")
+    formatted_preview: str = Field(default="", description="Telegram HTML no-send preview")
+
+
+def _report_source_preview_fields(source_health: dict[str, Any] | None) -> dict[str, Any]:
+    source_health = source_health or {}
+    rollups = source_health.get("rollups") or {}
+    return {
+        "source_ok_count": int(rollups.get("source_ok_count") or 0),
+        "source_total_count": int(rollups.get("source_count") or 0),
+        "source_confidence_percent": int(rollups.get("confidence_percent") or 0),
+        "source_gap_ids": [
+            str(source.get("work_item_id"))
+            for source in source_health.get("source_health", [])
+            if source.get("work_item_id")
+        ][:5],
+        "no_send_preview_count": int(rollups.get("no_send_preview_count") or 0),
+    }
+
+
+@router.get(
+    "/daily/preview",
+    response_model=DailyReportPreviewResponse,
+    summary="預覽日報",
+)
+async def preview_daily_report(
+    service: DailyReportDep = None,
+) -> DailyReportPreviewResponse:
+    """
+    預覽日報內容 (不發送)
+
+    這個 endpoint 只讀取 KPI 與 report source-health，不寫 Gateway queue、不發 Telegram。
+    """
+    kpi = await service.collect_daily_kpi()
+    source_health = await service.collect_report_source_health(days=1)
+    preview_fields = _report_source_preview_fields(source_health)
+    return DailyReportPreviewResponse(
+        report_date=kpi.period_end.strftime("%Y-%m-%d %H:%M"),
+        alert_total=kpi.total_alerts,
+        auto_repair_success=kpi.auto_repair_success,
+        auto_repair_failed=kpi.auto_repair_failed,
+        km_new_entries=kpi.km_new_entries,
+        playbook_count=kpi.playbook_count,
+        source_ok_count=preview_fields["source_ok_count"],
+        source_total_count=preview_fields["source_total_count"],
+        source_confidence_percent=preview_fields["source_confidence_percent"],
+        source_gap_ids=preview_fields["source_gap_ids"],
+        formatted_preview=service.format_daily_report(kpi, source_health),
+    )
+
+
+@router.get(
+    "/monthly/preview",
+    response_model=MonthlyReportPreviewResponse,
+    summary="預覽月報",
+)
+async def preview_monthly_report(
+    service: DailyReportDep = None,
+) -> MonthlyReportPreviewResponse:
+    """
+    預覽月報內容 (不發送)
+
+    月報目前使用統一 report source-health / no-send preview，不排程、不發送、不寫入。
+    """
+    from src.utils.timezone import now_taipei
+
+    source_health = await service.collect_report_source_health(days=30)
+    preview_fields = _report_source_preview_fields(source_health)
+    now = now_taipei()
+    return MonthlyReportPreviewResponse(
+        report_month=now.strftime("%Y-%m"),
+        source_ok_count=preview_fields["source_ok_count"],
+        source_total_count=preview_fields["source_total_count"],
+        source_confidence_percent=preview_fields["source_confidence_percent"],
+        source_gap_ids=preview_fields["source_gap_ids"],
+        no_send_preview_count=preview_fields["no_send_preview_count"],
+        formatted_preview=service.format_monthly_report_preview(
+            source_health,
+            generated_at=now,
+        ),
+    )
+
+
 @router.get(
     "/weekly/preview",
     response_model=WeeklyReportResponse,
diff --git a/apps/api/src/services/report_generation_service.py b/apps/api/src/services/report_generation_service.py
index 2c1f296c..3a1c39d9 100644
--- a/apps/api/src/services/report_generation_service.py
+++ b/apps/api/src/services/report_generation_service.py
@@ -26,8 +26,10 @@ Postmortem: Incident resolve 時，由呼叫方 await trigger_postmortem(inciden
 from __future__ import annotations
 
 import asyncio
+import html
 from dataclasses import dataclass, field
 from datetime import datetime, timedelta, timezone
+from typing import Any
 
 import structlog
 
@@ -170,7 +172,8 @@ class ReportGenerationService:
 
     async def _collect_alert_stats(self, since: datetime) -> dict:
         """收集告警統計（incident 表）"""
-        from sqlalchemy import func, select, text as sa_text
+        from sqlalchemy import func, select
+        from sqlalchemy import text as sa_text
 
         from src.db.base import get_db_context
         from src.db.models import IncidentRecord
@@ -296,12 +299,93 @@ class ReportGenerationService:
             logger.warning("daily_kpi_playbook_count_failed", error=str(e))
             return 0
 
-    def format_daily_report(self, kpi: DailyKpi) -> str:
+    def _format_report_source_health_block(
+        self,
+        source_health: dict[str, Any] | None,
+    ) -> list[str]:
+        """Format read-only report source health and automation asset state."""
+        if not source_health:
+            return []
+
+        rollups = source_health.get("rollups") or {}
+        ok_count = int(rollups.get("source_ok_count") or 0)
+        total_count = int(rollups.get("source_count") or 0)
+        confidence = int(rollups.get("confidence_percent") or 0)
+        gap_ids = [
+            str(source.get("work_item_id"))
+            for source in source_health.get("source_health", [])
+            if source.get("work_item_id")
+        ][:5]
+        gap_text = ", ".join(gap_ids) if gap_ids else "無"
+
+        lines = [
+            "",
+            "<b>🧾 報表資料源 / 沉澱</b>",
+            f"  來源: <code>{ok_count}/{total_count}</code> | 信心: <b>{confidence}%</b>",
+            f"  缺口: {html.escape(gap_text)}",
+        ]
+
+        for asset in (source_health.get("automation_assets") or [])[:5]:
+            label = html.escape(str(asset.get("label") or "資產"))
+            state = html.escape(str(asset.get("state") or "unknown"))
+            done = int(asset.get("done_count") or 0)
+            blocked = int(asset.get("blocked_count") or 0)
+            total = done + blocked
+            lines.append(f"  {label}: {state} {done}/{total}")
+
+        assessment = source_health.get("all_zero_assessment") or {}
+        if assessment.get("all_zero_observed"):
+            verdict = html.escape(str(assessment.get("verdict") or "source_gap_requires_review"))
+            lines.append(f"  全 0 判讀: {verdict}")
+
+        lines.append("  只讀判讀：不自動改排程、不直接發修復、不取代人工批准。")
+        return lines
+
+    def format_monthly_report_preview(
+        self,
+        source_health: dict[str, Any] | None,
+        *,
+        generated_at: datetime | None = None,
+    ) -> str:
+        """Format a monthly no-send preview from the unified report source-health model."""
+        now = generated_at or now_taipei()
+        source_health = source_health or {}
+        previews = source_health.get("no_send_previews") or []
+        monthly_preview = next(
+            (preview for preview in previews if preview.get("cadence_id") == "monthly"),
+            {},
+        )
+        gap_ids = monthly_preview.get("gap_source_ids") or []
+        gap_text = ", ".join(str(gap_id) for gap_id in gap_ids[:5]) if gap_ids else "無"
+
+        lines = [
+            "<b>📊 AWOOOI 月報 no-send preview</b>",
+            f"<b>{now.strftime('%Y-%m')}</b> | {now.strftime('%Y-%m-%d %H:%M')} 台北時間",
+            "",
+            "<b>🧭 月報交付狀態</b>",
+            f"  狀態: {html.escape(str(monthly_preview.get('delivery_state') or 'no_send_preview'))}",
+            f"  Owner: {html.escape(str(monthly_preview.get('owner_agent') or '未指定'))}",
+            f"  缺口來源: {html.escape(gap_text)}",
+            "  實發: 0 | Gateway queue write: 0",
+        ]
+        lines.extend(self._format_report_source_health_block(source_health))
+        lines += [
+            "",
+            "<i>🤖 AWOOOI 月報草案 | no-send preview，不代表已授權發送或自動修復</i>",
+        ]
+        return "\n".join(lines)
+
+    def format_daily_report(
+        self,
+        kpi: DailyKpi,
+        source_health: dict[str, Any] | None = None,
+    ) -> str:
         """
         組裝日度巡檢報告（Telegram HTML 格式）
 
         Args:
             kpi: DailyKpi 摘要
+            source_health: 報表資料源健康與自動化資產沉澱（只讀）
 
         Returns:
             Telegram HTML 格式字串
@@ -330,7 +414,7 @@ class ReportGenerationService:
             health_label = "需關注"
 
         lines = [
-            f"<b>📊 AWOOOI 日度巡檢報告</b>",
+            "<b>📊 AWOOOI 日度巡檢報告</b>",
             f"<b>{date_str}</b> | {period_str} 台北時間",
             "",
             f"<b>{health_icon} 整體健康度: {health_label}</b>",
@@ -355,12 +439,27 @@ class ReportGenerationService:
             "<b>🧠 知識積累</b>",
             f"  新增 KM 條目: {kpi.km_new_entries} 筆",
             f"  活躍 Playbook: {kpi.playbook_count} 個",
+        ]
+        lines.extend(self._format_report_source_health_block(source_health))
+        lines += [
             "",
             f"<i>🤖 AWOOOI AIOps 自動生成 | {kpi.period_end.strftime('%Y-%m-%d %H:%M')} 台北時間</i>",
         ]
 
         return "\n".join(lines)
 
+    async def collect_report_source_health(self, days: int) -> dict[str, Any] | None:
+        """Collect report source health in read-only mode; never send or write."""
+        try:
+            from src.services.ai_agent_report_source_health import (
+                build_ai_agent_report_source_health,
+            )
+
+            return await build_ai_agent_report_source_health(days=days)
+        except Exception as exc:
+            logger.warning("daily_report_source_health_failed", error=str(exc))
+            return None
+
     def format_postmortem(self, data: PostmortemData) -> str:
         """
         組裝事後檢討報告（Telegram HTML 格式）
@@ -378,7 +477,7 @@ class ReportGenerationService:
         resolved_str = data.resolved_at.strftime("%H:%M:%S")
 
         lines = [
-            f"<b>📋 事後檢討 (Postmortem)</b>",
+            "<b>📋 事後檢討 (Postmortem)</b>",
             f"<b>Incident:</b> {data.incident_id}",
             "",
             f"<b>⏱ 影響時長:</b> {duration_str}",
@@ -410,7 +509,8 @@ class ReportGenerationService:
         """
         try:
             kpi = await self.collect_daily_kpi()
-            report_text = self.format_daily_report(kpi)
+            source_health = await self.collect_report_source_health(days=1)
+            report_text = self.format_daily_report(kpi, source_health)
 
             from src.services.telegram_gateway import get_telegram_gateway
             gateway = get_telegram_gateway()
diff --git a/apps/api/tests/test_report_generation_service.py b/apps/api/tests/test_report_generation_service.py
index b23b495e..7fe0e467 100644
--- a/apps/api/tests/test_report_generation_service.py
+++ b/apps/api/tests/test_report_generation_service.py
@@ -23,6 +23,7 @@ from types import SimpleNamespace
 
 import pytest
 
+from src.services import weekly_report_service as weekly_report_module
 from src.services.report_generation_service import (
     DAILY_REPORT_HOUR_TAIPEI,
     POSTMORTEM_MIN_DURATION_MINUTES,
@@ -31,7 +32,6 @@ from src.services.report_generation_service import (
     ReportGenerationService,
     _seconds_until_next_report,
 )
-from src.services import weekly_report_service as weekly_report_module
 from src.services.weekly_report_service import WeeklyReportService
 
 _TZ_TAIPEI = timezone(timedelta(hours=8))
@@ -143,15 +143,15 @@ class TestFormatDailyReport:
 
     def _make_kpi(self, **kwargs) -> DailyKpi:
         now = datetime.now(_TZ_TAIPEI)
-        defaults = dict(
-            total_alerts=20,
-            auto_resolved=15,
-            human_approved=3,
-            auto_repair_success=12,
-            auto_repair_failed=3,
-            km_new_entries=5,
-            playbook_count=18,
-        )
+        defaults = {
+            "total_alerts": 20,
+            "auto_resolved": 15,
+            "human_approved": 3,
+            "auto_repair_success": 12,
+            "auto_repair_failed": 3,
+            "km_new_entries": 5,
+            "playbook_count": 18,
+        }
         defaults.update(kwargs)
         return DailyKpi(
             period_start=now - timedelta(hours=24),
@@ -239,6 +239,85 @@ class TestFormatDailyReport:
         report = svc.format_daily_report(kpi)
         assert "<b>" in report
 
+    def test_contains_report_source_health_assets(self):
+        """日報應顯示資料源健康與自動化資產沉澱"""
+        kpi = self._make_kpi()
+        source_health = {
+            "rollups": {
+                "source_ok_count": 2,
+                "source_count": 5,
+                "confidence_percent": 40,
+            },
+            "source_health": [
+                {"work_item_id": "report-source-gap:incident_summary"},
+                {"work_item_id": "report-source-gap:ai_performance"},
+            ],
+            "automation_assets": [
+                {"label": "KM", "state": "draft_ready", "done_count": 3, "blocked_count": 2},
+                {"label": "PlayBook", "state": "draft_required", "done_count": 0, "blocked_count": 2},
+                {"label": "腳本", "state": "readback_only", "done_count": 1, "blocked_count": 0},
+                {"label": "排程", "state": "no_send_preview", "done_count": 3, "blocked_count": 0},
+                {"label": "Verifier", "state": "source_health_ready", "done_count": 1, "blocked_count": 2},
+            ],
+            "all_zero_assessment": {
+                "all_zero_observed": True,
+                "verdict": "source_gap_or_no_signal_requires_review",
+            },
+        }
+        svc = ReportGenerationService()
+        report = svc.format_daily_report(kpi, source_health)
+
+        assert "報表資料源 / 沉澱" in report
+        assert "來源: <code>2/5</code>" in report
+        assert "report-source-gap:incident_summary" in report
+        assert "KM: draft_ready 3/5" in report
+        assert "PlayBook: draft_required 0/2" in report
+        assert "腳本: readback_only 1/1" in report
+        assert "排程: no_send_preview 3/3" in report
+        assert "Verifier: source_health_ready 1/3" in report
+        assert "全 0 判讀: source_gap_or_no_signal_requires_review" in report
+        assert "不自動改排程" in report
+
+    def test_monthly_preview_contains_no_send_source_health(self):
+        """月報 preview 應顯示 no-send 邊界與資產沉澱"""
+        source_health = {
+            "rollups": {
+                "source_ok_count": 2,
+                "source_count": 5,
+                "confidence_percent": 40,
+                "no_send_preview_count": 3,
+            },
+            "source_health": [
+                {"work_item_id": "report-source-gap:resolution_stats"},
+            ],
+            "no_send_previews": [
+                {
+                    "cadence_id": "monthly",
+                    "owner_agent": "Hermes",
+                    "delivery_state": "no_send_preview",
+                    "gap_source_ids": ["resolution_stats", "ai_performance"],
+                },
+            ],
+            "automation_assets": [
+                {"label": "KM", "state": "draft_ready", "done_count": 3, "blocked_count": 1},
+                {"label": "Verifier", "state": "source_health_ready", "done_count": 1, "blocked_count": 1},
+            ],
+        }
+        svc = ReportGenerationService()
+        report = svc.format_monthly_report_preview(
+            source_health,
+            generated_at=datetime(2026, 6, 18, 10, 0, tzinfo=_TZ_TAIPEI),
+        )
+
+        assert "月報 no-send preview" in report
+        assert "Owner: Hermes" in report
+        assert "實發: 0" in report
+        assert "來源: <code>2/5</code>" in report
+        assert "resolution_stats" in report
+        assert "KM: draft_ready 3/4" in report
+        assert "Verifier: source_health_ready 1/2" in report
+        assert "不代表已授權發送或自動修復" in report
+
 
 # =============================================================================
 # format_postmortem
@@ -250,18 +329,18 @@ class TestFormatPostmortem:
 
     def _make_postmortem(self, **kwargs) -> PostmortemData:
         now = datetime.now(_TZ_TAIPEI)
-        defaults = dict(
-            incident_id="INC-20260414-001",
-            title="KubePodOOMKilled on awoooi-api",
-            duration_minutes=25.5,
-            root_cause="記憶體洩漏導致 OOMKilled",
-            resolution_action="kubectl rollout restart deployment/awoooi-api",
-            ai_provider="OpenClaw (deepseek-r1:14b)",
-            auto_repaired=True,
-            retry_count=0,
-            created_at=now - timedelta(minutes=25, seconds=30),
-            resolved_at=now,
-        )
+        defaults = {
+            "incident_id": "INC-20260414-001",
+            "title": "KubePodOOMKilled on awoooi-api",
+            "duration_minutes": 25.5,
+            "root_cause": "記憶體洩漏導致 OOMKilled",
+            "resolution_action": "kubectl rollout restart deployment/awoooi-api",
+            "ai_provider": "OpenClaw (deepseek-r1:14b)",
+            "auto_repaired": True,
+            "retry_count": 0,
+            "created_at": now - timedelta(minutes=25, seconds=30),
+            "resolved_at": now,
+        }
         defaults.update(kwargs)
         return PostmortemData(**defaults)
 
diff --git a/apps/api/tests/test_weekly_report_preview_api.py b/apps/api/tests/test_weekly_report_preview_api.py
index 87a7bf08..0d0ff103 100644
--- a/apps/api/tests/test_weekly_report_preview_api.py
+++ b/apps/api/tests/test_weekly_report_preview_api.py
@@ -3,6 +3,29 @@ from fastapi.testclient import TestClient
 from src.main import app
 
 
+def test_daily_report_preview_exposes_source_health_no_send_preview():
+    client = TestClient(app)
+    response = client.get("/api/v1/stats/daily/preview")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert "report_date" in data
+    assert "alert_total" in data
+    assert "km_new_entries" in data
+    assert "playbook_count" in data
+    assert "source_ok_count" in data
+    assert "source_total_count" in data
+    assert "source_confidence_percent" in data
+    assert "source_gap_ids" in data
+    assert "formatted_preview" in data
+
+    preview = data["formatted_preview"]
+    assert "AWOOOI 日度巡檢報告" in preview
+    assert "報表資料源 / 沉澱" in preview
+    assert f"來源: <code>{data['source_ok_count']}/{data['source_total_count']}</code>" in preview
+    assert "不自動改排程" in preview
+
+
 def test_weekly_report_preview_exposes_source_health_no_send_preview():
     client = TestClient(app)
     response = client.get("/api/v1/stats/weekly/preview")
@@ -25,3 +48,25 @@ def test_weekly_report_preview_exposes_source_health_no_send_preview():
         assert "報表資料源 / 沉澱" in preview
         assert f"來源: <code>{data['source_ok_count']}/{data['source_total_count']}</code>" in preview
         assert "不自動改排程" in preview
+
+
+def test_monthly_report_preview_exposes_source_health_no_send_preview():
+    client = TestClient(app)
+    response = client.get("/api/v1/stats/monthly/preview")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert "report_month" in data
+    assert "source_ok_count" in data
+    assert "source_total_count" in data
+    assert "source_confidence_percent" in data
+    assert "source_gap_ids" in data
+    assert "no_send_preview_count" in data
+    assert "formatted_preview" in data
+
+    preview = data["formatted_preview"]
+    assert "月報 no-send preview" in preview
+    assert "報表資料源 / 沉澱" in preview
+    assert f"來源: <code>{data['source_ok_count']}/{data['source_total_count']}</code>" in preview
+    assert "實發: 0" in preview
+    assert "不代表已授權發送或自動修復" in preview