feat: Tavily search integration (#1039)

Co-authored-by: Wendong <w3ndong.fan@gmail.com>

camel/toolkits/search_toolkit.py

@@ -305,7 +305,56 @@ def query_wolfram_alpha(self, query: str, is_detailed: bool) -> str:
                 for sub in pod.subpods:
                     result += (sub.plaintext or "None") + '\n'
 
-        return result.rstrip()  # Remove trailing whitespace
+        return result.rstrip()
+
+    def tavily_search(
+        self, query: str, num_results: int = 5, **kwargs
+    ) -> List[Dict[str, Any]]:
+        r"""Use Tavily Search API to search information for the given query.
+
+        Args:
+            query (str): The query to be searched.
+            num_results (int): The number of search results to retrieve
+                (default is `5`).
+            **kwargs: Additional optional parameters supported by Tavily's API:
+                - search_depth (str): "basic" or "advanced" search depth.
+                - topic (str): The search category, e.g., "general" or "news."
+                - days (int): Time frame in days for news-related searches.
+                - max_results (int): Max number of results to return
+                  (overrides `num_results`).
+                See https://docs.tavily.com/docs/python-sdk/tavily-search/
+                api-reference for details.
+
+        Returns:
+            List[Dict[str, Any]]: A list of dictionaries representing search
+                results. Each dictionary contains:
+                - 'result_id' (int): The result's index.
+                - 'title' (str): The title of the result.
+                - 'description' (str): A brief description of the result.
+                - 'long_description' (str): Detailed information, if available.
+                - 'url' (str): The URL of the result.
+                - 'content' (str): Relevant content from the search result.
+                - 'images' (list): A list of related images (if
+                  `include_images` is True).
+                - 'published_date' (str): Publication date for news topics
+                  (if available).
+        """
+        from tavily import TavilyClient  # type: ignore[import-untyped]
+
+        Tavily_API_KEY = os.getenv("TAVILY_API_KEY")
+        if not Tavily_API_KEY:
+            raise ValueError(
+                "`TAVILY_API_KEY` not found in environment variables. "
+                "Get `TAVILY_API_KEY` here: `https://www.tavily.com/api/`."
+            )
+
+        client = TavilyClient(Tavily_API_KEY)
+
+        try:
+            results = client.search(query, max_results=num_results, **kwargs)
+            return results
+        except Exception as e:
+            return [{"error": f"An unexpected error occurred: {e!s}"}]
 
     def get_tools(self) -> List[FunctionTool]:
         r"""Returns a list of FunctionTool objects representing the
@@ -320,6 +369,7 @@ def get_tools(self) -> List[FunctionTool]:
             FunctionTool(self.search_google),
             FunctionTool(self.search_duckduckgo),
             FunctionTool(self.query_wolfram_alpha),
+            FunctionTool(self.tavily_search),
         ]