diff --git a/src/summary_mcp/models/llm_result.py b/src/summary_mcp/models/llm_result.py
index e9de07c..0d4ba8a 100644
--- a/src/summary_mcp/models/llm_result.py
+++ b/src/summary_mcp/models/llm_result.py
@@ -11,7 +11,7 @@ Category = Literal["资讯", "方法论", "工具实践", "观点评论"]
 class LlmSummaryResult(BaseModel):
     title: str = Field(min_length=1)
     url: HttpUrl
-    summary: str = Field(min_length=20, max_length=140)
+    summary: str = Field(min_length=20, max_length=300)
     highlights: list[str] = Field(min_length=3, max_length=5)
     keywords: list[str] = Field(min_length=5, max_length=8)
     topics: list[str] = Field(min_length=3, max_length=5)