diff --git a/app/config.py b/app/config.py
index bd78863..eb91cf4 100644
--- a/app/config.py
+++ b/app/config.py
@@ -38,7 +38,7 @@ class ProxySettings(BaseModel):
 class SearchSettings(BaseModel):
     engine: str = Field(default="Google", description="Search engine the llm to use")
     fallback_engines: List[str] = Field(
-        default_factory=lambda: ["DuckDuckGo", "Baidu"],
+        default_factory=lambda: ["DuckDuckGo", "Baidu", "Bing"],
         description="Fallback search engines to try if the primary engine fails",
     )
     retry_delay: int = Field(
@@ -49,6 +49,14 @@ class SearchSettings(BaseModel):
         default=3,
         description="Maximum number of times to retry all engines when all fail",
     )
+    lang: str = Field(
+        default="en",
+        description="Language code for search results (e.g., en, zh, fr)",
+    )
+    country: str = Field(
+        default="us",
+        description="Country code for search results (e.g., us, cn, uk)",
+    )
 
 
 class BrowserSettings(BaseModel):
diff --git a/app/tool/search/baidu_search.py b/app/tool/search/baidu_search.py
index a6fca59..8beb330 100644
--- a/app/tool/search/baidu_search.py
+++ b/app/tool/search/baidu_search.py
@@ -1,10 +1,14 @@
+from typing import List
+
 from baidusearch.baidusearch import search
 
 from app.tool.search.base import SearchItem, WebSearchEngine
 
 
 class BaiduSearchEngine(WebSearchEngine):
-    def perform_search(self, query, num_results=10, *args, **kwargs):
+    def perform_search(
+        self, query: str, num_results: int = 10, *args, **kwargs
+    ) -> List[SearchItem]:
         """
         Baidu search engine.
 
diff --git a/app/tool/search/base.py b/app/tool/search/base.py
index 1f2aeb7..31d78b9 100644
--- a/app/tool/search/base.py
+++ b/app/tool/search/base.py
@@ -17,7 +17,11 @@ class SearchItem(BaseModel):
         return f"{self.title} - {self.url}"
 
 
-class WebSearchEngine(object):
+class WebSearchEngine(BaseModel):
+    """Base class for web search engines."""
+
+    model_config = {"arbitrary_types_allowed": True}
+
     def perform_search(
         self, query: str, num_results: int = 10, *args, **kwargs
     ) -> List[SearchItem]:
diff --git a/app/tool/search/bing_search.py b/app/tool/search/bing_search.py
index 3a316aa..620620c 100644
--- a/app/tool/search/bing_search.py
+++ b/app/tool/search/bing_search.py
@@ -1,4 +1,4 @@
-from typing import List, Tuple
+from typing import List, Optional, Tuple
 
 import requests
 from bs4 import BeautifulSoup
@@ -36,7 +36,7 @@ BING_SEARCH_URL = "https://www.bing.com/search?q="
 
 
 class BingSearchEngine(WebSearchEngine):
-    session: requests.Session = None
+    session: Optional[requests.Session] = None
 
     def __init__(self, **data):
         """Initialize the BingSearch tool with a requests session."""
@@ -133,7 +133,9 @@ class BingSearchEngine(WebSearchEngine):
             logger.warning(f"Error parsing HTML: {e}")
             return [], None
 
-    def perform_search(self, query, num_results=10, *args, **kwargs):
+    def perform_search(
+        self, query: str, num_results: int = 10, *args, **kwargs
+    ) -> List[SearchItem]:
         """
         Bing search engine.
 
diff --git a/app/tool/search/duckduckgo_search.py b/app/tool/search/duckduckgo_search.py
index d7024fd..ca269b8 100644
--- a/app/tool/search/duckduckgo_search.py
+++ b/app/tool/search/duckduckgo_search.py
@@ -1,10 +1,14 @@
+from typing import List
+
 from duckduckgo_search import DDGS
 
 from app.tool.search.base import SearchItem, WebSearchEngine
 
 
 class DuckDuckGoSearchEngine(WebSearchEngine):
-    def perform_search(self, query, num_results=10, *args, **kwargs):
+    def perform_search(
+        self, query: str, num_results: int = 10, *args, **kwargs
+    ) -> List[SearchItem]:
         """
         DuckDuckGo search engine.
 
@@ -18,14 +22,14 @@ class DuckDuckGoSearchEngine(WebSearchEngine):
                 # If it's just a URL
                 results.append(
                     SearchItem(
-                        title=f"DuckDuckGo Result {i+1}", url=item, description=None
+                        title=f"DuckDuckGo Result {i + 1}", url=item, description=None
                     )
                 )
             elif isinstance(item, dict):
                 # Extract data from the dictionary
                 results.append(
                     SearchItem(
-                        title=item.get("title", f"DuckDuckGo Result {i+1}"),
+                        title=item.get("title", f"DuckDuckGo Result {i + 1}"),
                         url=item.get("href", ""),
                         description=item.get("body", None),
                     )
@@ -35,7 +39,7 @@ class DuckDuckGoSearchEngine(WebSearchEngine):
                 try:
                     results.append(
                         SearchItem(
-                            title=getattr(item, "title", f"DuckDuckGo Result {i+1}"),
+                            title=getattr(item, "title", f"DuckDuckGo Result {i + 1}"),
                             url=getattr(item, "href", ""),
                             description=getattr(item, "body", None),
                         )
@@ -44,7 +48,7 @@ class DuckDuckGoSearchEngine(WebSearchEngine):
                     # Fallback
                     results.append(
                         SearchItem(
-                            title=f"DuckDuckGo Result {i+1}",
+                            title=f"DuckDuckGo Result {i + 1}",
                             url=str(item),
                             description=None,
                         )
diff --git a/app/tool/search/google_search.py b/app/tool/search/google_search.py
index 03f21b5..bd0838e 100644
--- a/app/tool/search/google_search.py
+++ b/app/tool/search/google_search.py
@@ -1,10 +1,14 @@
+from typing import List
+
 from googlesearch import search
 
 from app.tool.search.base import SearchItem, WebSearchEngine
 
 
 class GoogleSearchEngine(WebSearchEngine):
-    def perform_search(self, query, num_results=10, *args, **kwargs):
+    def perform_search(
+        self, query: str, num_results: int = 10, *args, **kwargs
+    ) -> List[SearchItem]:
         """
         Google search engine.
 
diff --git a/app/tool/web_search.py b/app/tool/web_search.py
index 0ce504f..da15489 100644
--- a/app/tool/web_search.py
+++ b/app/tool/web_search.py
@@ -207,8 +207,8 @@ class WebSearch(BaseTool):
         self,
         query: str,
         num_results: int = 5,
-        lang: str = "en",
-        country: str = "us",
+        lang: Optional[str] = None,
+        country: Optional[str] = None,
         fetch_content: bool = False,
     ) -> SearchResponse:
         """
@@ -217,14 +217,14 @@ class WebSearch(BaseTool):
         Args:
             query: The search query to submit to the search engine
             num_results: The number of search results to return (default: 5)
-            lang: Language code for search results (default: en)
-            country: Country code for search results (default: us)
+            lang: Language code for search results (default from config)
+            country: Country code for search results (default from config)
             fetch_content: Whether to fetch content from result pages (default: False)
 
         Returns:
             A structured response containing search results and metadata
         """
-        # Get retry settings from config
+        # Get settings from config
         retry_delay = (
             getattr(config.search_config, "retry_delay", 60)
             if config.search_config
@@ -235,6 +235,22 @@ class WebSearch(BaseTool):
             if config.search_config
             else 3
         )
+
+        # Use config values for lang and country if not specified
+        if lang is None:
+            lang = (
+                getattr(config.search_config, "lang", "en")
+                if config.search_config
+                else "en"
+            )
+
+        if country is None:
+            country = (
+                getattr(config.search_config, "country", "us")
+                if config.search_config
+                else "us"
+            )
+
         search_params = {"lang": lang, "country": country}
 
         # Try searching with retries when all engines fail
diff --git a/config/config.example.toml b/config/config.example.toml
index 82a80c4..e456051 100644
--- a/config/config.example.toml
+++ b/config/config.example.toml
@@ -79,6 +79,10 @@ temperature = 0.0                          # Controls randomness for vision mode
 #retry_delay = 60
 # Maximum number of times to retry all engines when all fail. Default is 3.
 #max_retries = 3
+# Language code for search results. Options: "en" (English), "zh" (Chinese), etc.
+#lang = "en"
+# Country code for search results. Options: "us" (United States), "cn" (China), etc.
+#country = "us"
 
 
 ## Sandbox configuration
diff --git a/requirements.txt b/requirements.txt
index e2867e9..3324283 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,3 +33,9 @@ httpx>=0.27.0
 tomli>=2.0.0
 
 boto3~=1.37.18
+
+requests~=2.32.3
+beautifulsoup4~=4.13.3
+
+huggingface-hub~=0.29.2
+setuptools~=75.8.0