Ensure all tools have default initialize params

README.md

@@ -568,7 +568,7 @@ class MovieInfoTool
     property :movie_id, type: "integer", description: "The TMDb ID of the movie", required: true
   end
 
-  def initialize(api_key:)
+  def initialize(api_key: ENV["TMDB_API_KEY"])
     @api_key = api_key
   end
 

examples/assistant_chat.rb

@@ -11,7 +11,7 @@
   llm: openai,
   instructions: "You are a Meteorologist Assistant that is able to pull the weather for any location",
   tools: [
-    Langchain::Tool::Weather.new(api_key: ENV["OPEN_WEATHER_API_KEY"])
+    Langchain::Tool::Weather.new
   ]
 )
 

lib/langchain/tool/database.rb

@@ -36,7 +36,7 @@ class Database
     # @param tables [Array<Symbol>] The tables to use. Will use all if empty.
     # @param except_tables [Array<Symbol>] The tables to exclude. Will exclude none if empty.
     # @return [Database] Database object
-    def initialize(connection_string:, tables: [], exclude_tables: [])
+    def initialize(connection_string: ENV["DATABASE_URL"], tables: [], exclude_tables: [])
       depends_on "sequel"
 
       raise StandardError, "connection_string parameter cannot be blank" if connection_string.empty?

lib/langchain/tool/google_search.rb

@@ -27,7 +27,7 @@ class GoogleSearch
     # @param api_key [String] Search API key
     # @return [Langchain::Tool::GoogleSearch] Google search tool
     #
-    def initialize(api_key:)
+    def initialize(api_key: ENV["SERPAPI_API_KEY"])
       depends_on "google_search_results"
 
       @api_key = api_key

lib/langchain/tool/tavily.rb

@@ -26,7 +26,7 @@ class Tavily
       end
     end
 
-    def initialize(api_key:)
+    def initialize(api_key: ENV["TAVILY_API_KEY"])
       @api_key = api_key
     end
 

lib/langchain/tool/vectorsearch.rb

@@ -25,7 +25,7 @@ class Vectorsearch
     # Initializes the Vectorsearch tool
     #
     # @param vectorsearch [Langchain::Vectorsearch::Base] Vectorsearch instance to use
-    def initialize(vectorsearch:)
+    def initialize(vectorsearch: ENV["VECTORSEARCH_URL"])
       @vectorsearch = vectorsearch
     end
 

lib/langchain/tool/weather.rb

@@ -37,7 +37,7 @@ class Weather
         required: false
     end
 
-    def initialize(api_key:)
+    def initialize(api_key: ENV["OPEN_WEATHER_API_KEY"])
       @api_key = api_key
     end