diff --git a/src/polygateway/config.py b/src/polygateway/config.py
index 4f1b839..19bb13f 100644
--- a/src/polygateway/config.py
+++ b/src/polygateway/config.py
@@ -327,9 +327,7 @@ class GatewaySettings:
             backpressure=_load_backpressure(scope_u, env),
             selector=_load_choice(env, f"{scope_u}__SELECTOR", _SELECTORS, "health_aware"),
             quota_full=_load_choice(env, f"{scope_u}__QUOTA_FULL", _QUOTA_FULL, "wait"),
-            circuit_open=_load_choice(
-                env, f"{scope_u}__CIRCUIT_OPEN", _CIRCUIT_OPEN, "fail_fast"
-            ),
+            circuit_open=_load_choice(env, f"{scope_u}__CIRCUIT_OPEN", _CIRCUIT_OPEN, "fail_fast"),
             **_load_pgw(env),
         )
 
diff --git a/src/polygateway/middleware/admission.py b/src/polygateway/middleware/admission.py
index ca71563..21ac9ba 100644
--- a/src/polygateway/middleware/admission.py
+++ b/src/polygateway/middleware/admission.py
@@ -261,9 +261,7 @@ class SourceAdmission:
             )
         nap = self._nap(hint, clock)
         if hint > 0:
-            logger.info(
-                "熔断开路等待 {:.1f}s 后重试(scope={}, 原因={})", nap, self._scope, reasons
-            )
+            logger.info("熔断开路等待 {:.1f}s 后重试(scope={}, 原因={})", nap, self._scope, reasons)
         await self._sleep(nap)
 
     def _nap(self, hint: float, clock: StallClock) -> float:
diff --git a/tests/contracts/test_breaker_contract.py b/tests/contracts/test_breaker_contract.py
index 4df680e..2489008 100644
--- a/tests/contracts/test_breaker_contract.py
+++ b/tests/contracts/test_breaker_contract.py
@@ -291,7 +291,6 @@ class TestRetryAfter:
         await _open_gate(gate, "s1")  # s1 开路;s2 健康
         assert await gate.retry_after_s(("s1", "s2")) == 0.0
 
-
     async def test_half_open_rejection_reports_no_certain_wait(self, gate_factory, clock):
         """探针在途时被拒 → 0.0(issue #14): 探针随时可能出结果,不存在确定时刻。
 
diff --git a/tests/unit/test_backpressure.py b/tests/unit/test_backpressure.py
index df2e858..1a6c505 100644
--- a/tests/unit/test_backpressure.py
+++ b/tests/unit/test_backpressure.py
@@ -628,8 +628,12 @@ class TestCircuitOpenPolicy:
         clock = FakeClock()
         src = make_source()
         mw = _mw(
-            [src], self._free_limiter(clock, src), [], clock=clock,
-            sleep=BoundedSleep(), gate=await self._opened_gate(clock),
+            [src],
+            self._free_limiter(clock, src),
+            [],
+            clock=clock,
+            sleep=BoundedSleep(),
+            gate=await self._opened_gate(clock),
         )
         with pytest.raises(CircuitOpenError) as ei:
             await mw(_REQ)
@@ -650,8 +654,13 @@ class TestCircuitOpenPolicy:
 
         sleep._side_effect = advance
         mw = _mw(
-            [src], self._free_limiter(clock, src), [_ok()], clock=clock,
-            sleep=sleep, gate=await self._opened_gate(clock), circuit_open="wait",
+            [src],
+            self._free_limiter(clock, src),
+            [_ok()],
+            clock=clock,
+            sleep=sleep,
+            gate=await self._opened_gate(clock),
+            circuit_open="wait",
         )
         resp = await mw(_REQ)
         assert resp.content == "ok"
@@ -671,8 +680,14 @@ class TestCircuitOpenPolicy:
 
         sleep._side_effect = advance
         mw = _mw(
-            [src], self._free_limiter(clock, src), [_ok()], clock=clock, sleep=sleep,
-            gate=await self._opened_gate(clock), quota_full="fail_fast", circuit_open="wait",
+            [src],
+            self._free_limiter(clock, src),
+            [_ok()],
+            clock=clock,
+            sleep=sleep,
+            gate=await self._opened_gate(clock),
+            quota_full="fail_fast",
+            circuit_open="wait",
         )
         assert (await mw(_REQ)).content == "ok"
 
@@ -694,8 +709,13 @@ class TestCircuitOpenPolicy:
 
         sleep._side_effect = advance
         mw = _mw(
-            [src], self._free_limiter(clock, src), [], clock=clock, sleep=sleep,
-            gate=await self._opened_gate(clock, long_cooldown), circuit_open="wait",
+            [src],
+            self._free_limiter(clock, src),
+            [],
+            clock=clock,
+            sleep=sleep,
+            gate=await self._opened_gate(clock, long_cooldown),
+            circuit_open="wait",
         )
         with pytest.raises(AllSourcesExhausted) as ei:
             await mw(_REQ)
@@ -708,8 +728,13 @@ class TestCircuitOpenPolicy:
         clock = FakeClock()
         src = make_source()
         mw = _mw(
-            [src], self._free_limiter(clock, src), [], clock=clock,
-            sleep=asyncio.sleep, gate=await self._opened_gate(clock), circuit_open="wait",
+            [src],
+            self._free_limiter(clock, src),
+            [],
+            clock=clock,
+            sleep=asyncio.sleep,
+            gate=await self._opened_gate(clock),
+            circuit_open="wait",
         )
         task = asyncio.create_task(mw(_REQ))
         await asyncio.sleep(0.03)
diff --git a/tests/unit/test_config.py b/tests/unit/test_config.py
index 74011eb..82aeb8d 100644
--- a/tests/unit/test_config.py
+++ b/tests/unit/test_config.py
@@ -177,9 +177,7 @@ class TestResilienceKeys:
         是"快速失败 → 长时间挂起"这个最危险的方向,不能强加给存量下游。
         """
         assert GatewaySettings.from_env("LLM", env=_env()).circuit_open == "fail_fast"
-        waiting = GatewaySettings.from_env(
-            "LLM", env=_env(**{"LLM__CIRCUIT_OPEN": "wait"})
-        )
+        waiting = GatewaySettings.from_env("LLM", env=_env(**{"LLM__CIRCUIT_OPEN": "wait"}))
         assert waiting.circuit_open == "wait"
         with pytest.raises(ValueError, match="CIRCUIT_OPEN"):
             GatewaySettings.from_env("LLM", env=_env(**{"LLM__CIRCUIT_OPEN": "block"}))