Fixed DuckDuckGoSeacrhTool issue

tools/web_search.py

@@ -18,7 +18,7 @@ class DuckDuckGoSearchTool(Tool):
 
     def __init__(self, max_results=10, **kwargs):
         super().__init__()
-        self.max_results = max_results
+        self.default_max_results = max_results
         try:
             from duckduckgo_search import DDGS
         except ImportError as e:
@@ -27,8 +27,16 @@ class DuckDuckGoSearchTool(Tool):
             ) from e
         self.ddgs = DDGS(**kwargs)
 
-    def forward(self, query: str) -> str:
-        results = self.ddgs.text(query, max_results=self.max_results)
+    def forward(self, query: str, max_results: int = None) -> str:
+        """Performs a web search
+        Args:
+            query: The search query to perform
+            max_results: Maximum number of results to return. If not specified, uses the value from __init__
+        Returns:
+            String containing formatted search results
+        """
+        results_limit = max_results if max_results is not None else self.default_max_results
+        results = self.ddgs.text(query, max_results=results_limit)
         if len(results) == 0:
             raise Exception(
                 "No results found! Try a less restrictive/shorter query.")