Google Search Integration with Gemini Models

lib/ruby_llm/providers/gemini/google_search_tool.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module RubyLLM
+  module Providers
+    module Gemini
+      # Marker for Gemini's native Google search
+      class GoogleSearchTool < RubyLLM::Tool
+        description 'Gemini built-in Google search capability'
+
+        def name = :google_search
+        def payload = { google_search: {} }
+      end
+    end
+  end
+end

lib/ruby_llm/providers/gemini/tools.rb

@@ -9,9 +9,16 @@ module Tools
         def format_tools(tools)
           return [] if tools.empty?
 
-          [{
-            functionDeclarations: tools.values.map { |tool| function_declaration_for(tool) }
-          }]
+          builtins, customs = tools.values.partition { |t| t.name == :google_search }
+
+          formatted_tools = builtins.map(&:payload).uniq
+          unless customs.empty?
+            formatted_tools << {
+              functionDeclarations: customs.map { |t| function_declaration_for(t) }
+            }
+          end
+
+          formatted_tools
         end
 
         # Extract tool calls from response data