diff --git a/internal/mcp/tools/fetch_url.go b/internal/mcp/tools/fetch_url.go
index 23e6198..3f514e6 100644
--- a/internal/mcp/tools/fetch_url.go
+++ b/internal/mcp/tools/fetch_url.go
@@ -209,12 +209,8 @@ func hostAllowed(host string, allowed []string) bool {
 		if pattern == host {
 			return true
 		}
-		if strings.HasPrefix(pattern, "*.") {
-			pattern = pattern[2:]
-		}
-		if strings.HasPrefix(pattern, ".") {
-			pattern = pattern[1:]
-		}
+		pattern = strings.TrimPrefix(pattern, "*.")
+		pattern = strings.TrimPrefix(pattern, ".")
 		if host == pattern || strings.HasSuffix(host, "."+pattern) {
 			return true
 		}