diff --git a/apps/api/src/api/v1/health.py b/apps/api/src/api/v1/health.py
index 0c24b7660..bc3d1867b 100644
--- a/apps/api/src/api/v1/health.py
+++ b/apps/api/src/api/v1/health.py
@@ -47,6 +47,11 @@ class ComponentHealth(BaseModel):
     status: Literal["up", "down", "degraded"]
     latency_ms: float | None = None
     error: str | None = None
+    provider_name: str | None = None
+    diagnosis_code: str | None = None
+    retry_after_seconds: float | None = None
+    cooldown_remaining_seconds: float | None = None
+    is_cooldown: bool = False
 
 
 class HealthResponse(BaseModel):
@@ -194,16 +199,47 @@ async def _ollama_endpoint_health_check(name: str, url: str) -> ComponentHealth:
         return ComponentHealth(
             status="down",
             error=f"recent endpoint failure cooldown: {cooldown_remaining:.0f}s",
+            provider_name=name,
+            diagnosis_code="endpoint_cooldown",
+            retry_after_seconds=round(cooldown_remaining, 1),
+            cooldown_remaining_seconds=round(cooldown_remaining, 1),
+            is_cooldown=True,
         )
 
     result = await _http_health_check(name, url, "/api/tags")
+    result.provider_name = name
     if result.status == "up":
+        result.diagnosis_code = "endpoint_reachable"
         record_ollama_endpoint_success(url)
     else:
+        result.diagnosis_code = _classify_ollama_endpoint_failure(name, result.error)
         record_ollama_endpoint_failure(url)
     return result
 
 
+def _classify_ollama_endpoint_failure(
+    provider_name: str,
+    error: str | None,
+) -> str:
+    """Return a stable diagnosis code for UI/alert rendering."""
+    normalized_error = (error or "").lower()
+    if "cooldown" in normalized_error:
+        return "endpoint_cooldown"
+    if "502" in normalized_error or "bad gateway" in normalized_error:
+        return (
+            "local_proxy_upstream_unreachable"
+            if provider_name == "ollama_local"
+            else "proxy_upstream_unreachable"
+        )
+    if "timeout" in normalized_error:
+        return "endpoint_timeout"
+    if "connection refused" in normalized_error:
+        return "endpoint_connection_refused"
+    if "no route to host" in normalized_error or "network is unreachable" in normalized_error:
+        return "endpoint_network_unreachable"
+    return "endpoint_unreachable"
+
+
 async def check_openclaw() -> ComponentHealth:
     """Async OpenClaw health check via /health"""
     return await _http_health_check("openclaw", settings.OPENCLAW_URL, "/health")
diff --git a/apps/api/tests/test_health_ollama_provider_chain.py b/apps/api/tests/test_health_ollama_provider_chain.py
index 312a4bab8..3c9af9765 100644
--- a/apps/api/tests/test_health_ollama_provider_chain.py
+++ b/apps/api/tests/test_health_ollama_provider_chain.py
@@ -43,7 +43,10 @@ async def test_ollama_provider_chain_reports_fallback_when_primary_down(monkeypa
     assert aggregate.latency_ms == 42.0
     assert aggregate.error == "primary unavailable; fallback active: ollama_gcp_b"
     assert details["ollama_gcp_a"].status == "down"
+    assert details["ollama_gcp_a"].provider_name == "ollama_gcp_a"
+    assert details["ollama_gcp_a"].diagnosis_code == "endpoint_timeout"
     assert details["ollama_gcp_b"].status == "up"
+    assert details["ollama_gcp_b"].diagnosis_code == "endpoint_reachable"
     assert details["ollama_local"].status == "up"
 
 
@@ -108,6 +111,9 @@ async def test_ollama_provider_chain_uses_cooldown_after_failure(
     assert aggregate.status == "degraded"
     assert details["ollama_gcp_a"].status == "down"
     assert "cooldown" in (details["ollama_gcp_a"].error or "")
+    assert details["ollama_gcp_a"].diagnosis_code == "endpoint_cooldown"
+    assert details["ollama_gcp_a"].is_cooldown is True
+    assert details["ollama_gcp_a"].retry_after_seconds is not None
     assert "ollama_gcp_a" not in calls
     assert {"ollama_gcp_b", "ollama_local"} == set(calls)
 
@@ -132,3 +138,23 @@ async def test_ollama_provider_chain_success_clears_cooldown(
     await health.check_ollama_provider_chain()
 
     assert not is_ollama_endpoint_blocked("http://gcp-a:11434")
+
+
+def test_ollama_failure_classifier_marks_local_proxy_502() -> None:
+    assert (
+        health._classify_ollama_endpoint_failure(
+            "ollama_local",
+            "Server error '502 Bad Gateway' for url",
+        )
+        == "local_proxy_upstream_unreachable"
+    )
+
+
+def test_ollama_failure_classifier_marks_network_unreachable() -> None:
+    assert (
+        health._classify_ollama_endpoint_failure(
+            "ollama_local",
+            "No route to host",
+        )
+        == "endpoint_network_unreachable"
+    )
diff --git a/apps/web/messages/en.json b/apps/web/messages/en.json
index 4d28e587c..5a29ab182 100644
--- a/apps/web/messages/en.json
+++ b/apps/web/messages/en.json
@@ -230,6 +230,14 @@
       "agent": "Agent",
       "provider": "Provider"
     },
+    "aiModelHealth": {
+      "cooldown": "冷卻",
+      "cooldownSeconds": "冷卻 {seconds}s",
+      "localProxy": "111 proxy",
+      "timeout": "逾時",
+      "network": "網路不可達",
+      "refused": "拒絕"
+    },
     "loading": "載入中...",
     "trendUp": "↑{pct}%",
     "searchPlaceholderShort": "搜尋...",
diff --git a/apps/web/messages/zh-TW.json b/apps/web/messages/zh-TW.json
index 4d28e587c..5a29ab182 100644
--- a/apps/web/messages/zh-TW.json
+++ b/apps/web/messages/zh-TW.json
@@ -230,6 +230,14 @@
       "agent": "Agent",
       "provider": "Provider"
     },
+    "aiModelHealth": {
+      "cooldown": "冷卻",
+      "cooldownSeconds": "冷卻 {seconds}s",
+      "localProxy": "111 proxy",
+      "timeout": "逾時",
+      "network": "網路不可達",
+      "refused": "拒絕"
+    },
     "loading": "載入中...",
     "trendUp": "↑{pct}%",
     "searchPlaceholderShort": "搜尋...",
diff --git a/apps/web/src/components/shared/ai-model-status.tsx b/apps/web/src/components/shared/ai-model-status.tsx
index 2c078e9a0..ed96d7b91 100644
--- a/apps/web/src/components/shared/ai-model-status.tsx
+++ b/apps/web/src/components/shared/ai-model-status.tsx
@@ -16,11 +16,18 @@ interface ModelInfo {
   role: 'primary' | 'backup' | 'local' | 'agent' | 'provider'
   status: 'up' | 'down' | 'degraded' | 'unknown'
   latencyMs?: number | null
+  diagnosisCode?: string | null
+  retryAfterSeconds?: number | null
+  isCooldown?: boolean
 }
 
 interface HealthComponent {
   status?: 'up' | 'down' | 'degraded'
   latency_ms?: number | null
+  diagnosis_code?: string | null
+  retry_after_seconds?: number | null
+  is_cooldown?: boolean
+  error?: string | null
 }
 
 interface HealthResponse {
@@ -49,6 +56,31 @@ function statusColor(status: ModelInfo['status']) {
   return '#87867f'
 }
 
+function modelDetail(model: ModelInfo, t: ReturnType<typeof useTranslations>) {
+  if (typeof model.latencyMs === 'number' && model.status === 'up') {
+    return `${Math.round(model.latencyMs)}ms`
+  }
+  if (model.isCooldown) {
+    const seconds = Math.max(0, Math.round(model.retryAfterSeconds ?? 0))
+    return seconds > 0
+      ? t('aiModelHealth.cooldownSeconds', { seconds })
+      : t('aiModelHealth.cooldown')
+  }
+  if (model.diagnosisCode === 'local_proxy_upstream_unreachable') {
+    return t('aiModelHealth.localProxy')
+  }
+  if (model.diagnosisCode === 'endpoint_timeout') {
+    return t('aiModelHealth.timeout')
+  }
+  if (model.diagnosisCode === 'endpoint_network_unreachable') {
+    return t('aiModelHealth.network')
+  }
+  if (model.diagnosisCode === 'endpoint_connection_refused') {
+    return t('aiModelHealth.refused')
+  }
+  return t(`aiModelRoles.${model.role}` as never)
+}
+
 export function AIModelStatus() {
   const t = useTranslations('dashboard')
   const [models, setModels] = useState<ModelInfo[]>([
@@ -72,6 +104,9 @@ export function AIModelStatus() {
           role: PROVIDER_ROLES[key] ?? 'provider',
           status: d.components?.[key]?.status ?? 'unknown',
           latencyMs: d.components?.[key]?.latency_ms,
+          diagnosisCode: d.components?.[key]?.diagnosis_code,
+          retryAfterSeconds: d.components?.[key]?.retry_after_seconds,
+          isCooldown: d.components?.[key]?.is_cooldown,
         })))
       })
       .catch(() => {})
@@ -98,9 +133,7 @@ export function AIModelStatus() {
             <span style={{ width: 5, height: 5, borderRadius: '50%', background: statusColor(m.status), flexShrink: 0 }} />
             <span style={{ fontSize: 12, fontWeight: 500, color: '#141413' }}>{m.name}</span>
             <span style={{ fontSize: 10, color: '#87867f', marginLeft: 'auto' }}>
-              {typeof m.latencyMs === 'number'
-                ? `${Math.round(m.latencyMs)}ms`
-                : t(`aiModelRoles.${m.role}` as never)}
+              {modelDetail(m, t)}
             </span>
           </div>
         ))}
diff --git a/docs/LOGBOOK.md b/docs/LOGBOOK.md
index fa6866d93..0270fdbdd 100644
--- a/docs/LOGBOOK.md
+++ b/docs/LOGBOOK.md
@@ -51,6 +51,49 @@ http://127.0.0.1:3107/zh-TW/awooop/work-items?project_id=awoooi&incident_id=INC-
 - 整體 AI 自動化飛輪：約 73%；仍不能宣稱 24h 全自動 repair 閉環，需以 production evidence 持續補齊。
 - 24h 完整 AI Agent 自動修復 production claim：0%；仍維持嚴格口徑，只能宣稱「已驗證的特定 controlled apply / drill-down 能被追蹤」。
 
+## 2026-05-31｜Ollama health 診斷碼與前台冷卻顯示
+
+**背景**：
+
+- 111 local fallback 復原時，production health 曾短暫顯示 `recent endpoint failure cooldown`；這是 API pod 內 60 秒短期抑制，不等於 endpoint 當下仍不可用。
+- 既有 `/api/v1/health` 只回 `status/latency/error`，前台與告警只能把 cooldown / 502 upstream / timeout 都看成同一種 down。
+
+**本次調整**：
+
+- `apps/api/src/api/v1/health.py` 的 `ComponentHealth` 新增：
+  - `provider_name`
+  - `diagnosis_code`
+  - `retry_after_seconds`
+  - `cooldown_remaining_seconds`
+  - `is_cooldown`
+- Ollama endpoint health 會穩定分類：
+  - `endpoint_reachable`
+  - `endpoint_cooldown`
+  - `local_proxy_upstream_unreachable`
+  - `proxy_upstream_unreachable`
+  - `endpoint_timeout`
+  - `endpoint_connection_refused`
+  - `endpoint_network_unreachable`
+  - `endpoint_unreachable`
+- `AIModelStatus` 前台卡片讀取這些欄位，將 cooldown 顯示成 `冷卻 Ns`，111 proxy / timeout / network unreachable / refused 也顯示短標籤。
+
+**驗證**：
+
+```text
+python3 -m py_compile apps/api/src/api/v1/health.py apps/api/tests/test_health_ollama_provider_chain.py -> pass
+pytest tests/test_health_ollama_provider_chain.py -q -> 7 passed
+ruff check src/api/v1/health.py tests/test_health_ollama_provider_chain.py --select E9,F401,F821,F841 -> pass
+python3 -m json.tool apps/web/messages/zh-TW.json / en.json -> pass
+cmp apps/web/messages/zh-TW.json apps/web/messages/en.json -> pass
+pnpm --dir apps/web exec tsc --noEmit --tsBuildInfoFile /tmp/awoooi-ai-model-health-diagnosis-20260531.tsbuildinfo -> pass
+git diff --check -> pass
+```
+
+**判讀**：
+
+- 這不是改路由策略，也不是新增修復動作；只是把健康檢查結果從「一段文字」升級成可被 Telegram / 前台穩定解讀的診斷欄位。
+- 後續若 111 再短暫抖動，前台應能看到「冷卻」或「111 proxy」而不是只看到泛化的 Ollama down。
+
 ## 2026-05-31｜Ollama 111 local fallback 復原確認
 
 **背景**：
diff --git a/docs/superpowers/specs/2026-04-15-MASTER-ai-autonomous-flywheel-v2.md b/docs/superpowers/specs/2026-04-15-MASTER-ai-autonomous-flywheel-v2.md
index a544dc93a..6fdb8e2e6 100644
--- a/docs/superpowers/specs/2026-04-15-MASTER-ai-autonomous-flywheel-v2.md
+++ b/docs/superpowers/specs/2026-04-15-MASTER-ai-autonomous-flywheel-v2.md
@@ -2727,6 +2727,12 @@ Phase 6 完成後
 - Verification：`110 -> 192.168.0.111:11434 /api/tags -> 200`、`110 -> 127.0.0.1:11437 /api/tags -> 200`、production `/api/v1/health` cooldown expiry 後 `ollama_local=up`；`11437 hermes3:latest /api/generate -> 200 response=OK`，同輪 `11435/11436 hermes3:latest` 也皆成功。111 host 上 `com.momo.ollama111-allow-proxy` 為 running，allowlist 包含 `192.168.0.110/32`，`pmset sleep=0`。
 - 判讀：11437 目前已恢復，三層 Ollama health 已全綠；中間的 `recent endpoint failure cooldown` 是 API pod 內 60 秒短期抑制殘留，不代表 endpoint 當下仍不可用。若再復發，告警需把 111 reachability / wake evidence 顯示出來，避免被誤讀成 GCP-A/B Ollama 全掛。
 
+**T154j Ollama health diagnosis codes surfaced（2026-05-31 台北）**：
+- 觸發：T154i 暴露 health surface 只剩 `status/latency/error`，無法讓 Telegram / 前台穩定區分 cooldown、111 proxy upstream、timeout、network unreachable。
+- 修正：`ComponentHealth` 新增 `provider_name`、`diagnosis_code`、`retry_after_seconds`、`cooldown_remaining_seconds`、`is_cooldown`；Ollama endpoint health 分類 `endpoint_reachable`、`endpoint_cooldown`、`local_proxy_upstream_unreachable`、`endpoint_timeout`、`endpoint_network_unreachable` 等。`AIModelStatus` 讀取診斷欄位，前台顯示 `冷卻 Ns`、`111 proxy`、`逾時`、`網路不可達`、`拒絕`。
+- Verification：focused `py_compile` pass、pytest `test_health_ollama_provider_chain.py` 7 passed、ruff `E9/F401/F821/F841` pass、i18n JSON parse/cmp pass、web `tsc --noEmit` pass、`git diff --check` pass。
+- 判讀：T154j 不改 ADR-110 路由策略、不新增自動修復，只把 health truth 變成可機器判讀的欄位，避免未來把 cooldown 或 111 upstream 抖動誤報成「所有 Ollama 掛」。
+
 **T152 Ansible runtime readiness surfaced（2026-05-24 台北）**：
 - 觸發：T151 已讓首頁看到 execution backend / Ansible attribution，但 operator 仍看不到 runtime 端缺什麼，容易把「Ansible 有候選」誤解成「Ansible 已能自動修復」。
 - 修正：API image 複製 `infra/ansible/` 作 read-only catalog；`truth-chain/quality/summary` 新增 `ansible_runtime`，回報 playbook binary、catalog、inventory、playbook_count、can_run_check_mode、blockers。首頁 execution evidence 同步顯示 runtime 狀態；目前 production 顯示 `runtime 未就緒：ansible_playbook_binary_missing`。未安裝 `ansible-core`、未啟用 check-mode / apply。