diff --git a/backend/app/tools/builtin/analysis.py b/backend/app/tools/builtin/analysis.py
index 43efd152..5f58b1d0 100644
--- a/backend/app/tools/builtin/analysis.py
+++ b/backend/app/tools/builtin/analysis.py
@@ -230,7 +230,7 @@ async def analysis_baseline(ctx: ToolContext, **kwargs: Any) -> dict[str, Any]:
 @register(
     name=contract.TOOL_NAMES["trend"],
     category=CATEGORY,
-    description="趋势：判断一条按期次排的序列是在持续上升、持续下降，还是没有明显趋势（只是一次波动）。",
+    description="趋势判断：判断一条按期次排的序列是在持续上升、持续下降，还是没有明显趋势（只是一次波动）。",
     args_schema=TrendArgs,
     guide=METHOD_GUIDE,
 )
diff --git a/backend/tests/test_analysis_tools.py b/backend/tests/test_analysis_tools.py
index 96513247..5e676e3d 100644
--- a/backend/tests/test_analysis_tools.py
+++ b/backend/tests/test_analysis_tools.py
@@ -156,6 +156,8 @@ def test_the_five_tools_take_no_thresholds_and_share_one_method():
         props = spec.args_schema.model_json_schema()["properties"]
         assert not set(props) & set(contract.DEFAULTS), f"{name} 的参数里有阈值：{set(props) & set(contract.DEFAULTS)}"
         assert spec.args_schema is ARGS[op] and spec.category == "分析" and spec.description
+        # 说明开头是契约里这种分析的叫法（「趋势判断：……」），助手的工具清单、证据面板、评测写的是同一种说法
+        assert spec.description.startswith(f"{contract.OP_LABELS[op]}："), spec.description[:12]
         assert spec.guide is METHOD_GUIDE and not spec.dangerous and not spec.writes_state
         # 不查库：能力登记、出处链都不把它的结果当查询快照
         assert not is_platform_query(name)