diff --git a/apps/api/src/api/v1/stats.py b/apps/api/src/api/v1/stats.py
index fe7c227a..ea1375df 100644
--- a/apps/api/src/api/v1/stats.py
+++ b/apps/api/src/api/v1/stats.py
@@ -360,6 +360,11 @@ class WeeklyReportResponse(BaseModel):
     ai_success_rate: float = Field(description="AI 成功率 (%)")
     commits_count: int = Field(description="本週 Commits 數")
     deploy_count: int = Field(description="本週部署次數")
+    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")
 
 
 @router.get(
@@ -385,6 +390,11 @@ async def preview_weekly_report(
         ai_success_rate=report.ai_success_rate,
         commits_count=report.commits_count,
         deploy_count=report.deploy_count,
+        source_ok_count=report.report_source_ok_count,
+        source_total_count=report.report_source_total_count,
+        source_confidence_percent=report.report_source_confidence_percent,
+        source_gap_ids=report.report_source_gap_ids,
+        formatted_preview=report.format(),
     )
 
 
diff --git a/apps/api/tests/test_weekly_report_preview_api.py b/apps/api/tests/test_weekly_report_preview_api.py
new file mode 100644
index 00000000..87a7bf08
--- /dev/null
+++ b/apps/api/tests/test_weekly_report_preview_api.py
@@ -0,0 +1,27 @@
+from fastapi.testclient import TestClient
+
+from src.main import app
+
+
+def test_weekly_report_preview_exposes_source_health_no_send_preview():
+    client = TestClient(app)
+    response = client.get("/api/v1/stats/weekly/preview")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert "week_range" in data
+    assert "alert_total" 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
+    assert data["source_total_count"] >= 0
+    assert data["source_ok_count"] >= 0
+
+    preview = data["formatted_preview"]
+    assert "報表資料信任度" in preview
+    if data["source_total_count"] > 0:
+        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