diff --git a/ollama/_client.py b/ollama/_client.py
index 18cb0fb4..bc154338 100644
--- a/ollama/_client.py
+++ b/ollama/_client.py
@@ -801,7 +801,12 @@ async def web_search(self, query: str, max_results: int = 3) -> WebSearchRespons
 
     Returns:
       WebSearchResponse with the search results
+    Raises:
+      ValueError: If OLLAMA_API_KEY environment variable is not set
     """
+    if not self._client.headers.get('authorization', '').startswith('Bearer '):
+      raise ValueError('Authorization header with Bearer token is required for web search')
+
     return await self._request(
       WebSearchResponse,
       'POST',
@@ -821,7 +826,12 @@ async def web_fetch(self, url: str) -> WebFetchResponse:
 
     Returns:
       WebFetchResponse with the fetched result
+    Raises:
+      ValueError: If OLLAMA_API_KEY environment variable is not set
     """
+    if not self._client.headers.get('authorization', '').startswith('Bearer '):
+      raise ValueError('Authorization header with Bearer token is required for web fetch')
+
     return await self._request(
       WebFetchResponse,
       'POST',