diff --git a/src/repository/error-rules.ts b/src/repository/error-rules.ts
index 51e15181a..4e2ef5d3f 100644
--- a/src/repository/error-rules.ts
+++ b/src/repository/error-rules.ts
@@ -437,6 +437,23 @@ const DEFAULT_ERROR_RULES = [
       },
     },
   },
+  // Issue #432: Empty message content validation error (non-retryable)
+  {
+    pattern: "all messages must have non-empty content",
+    category: "validation_error",
+    description: "Message content is empty (client error)",
+    matchType: "contains" as const,
+    isDefault: true,
+    isEnabled: true,
+    priority: 89,
+    overrideResponse: {
+      type: "error",
+      error: {
+        type: "validation_error",
+        message: "消息内容不能为空，请确保所有消息都有有效内容（最后一条 assistant 消息除外）",
+      },
+    },
+  },
   // Issue #366: Tool names must be unique (MCP server configuration error)
   {
     pattern: "Tool names must be unique",