1 files changed, 13 insertions, 1 deletions
diff --git a/lib/dispatch/adapter/interface/tool_definition.rb b/lib/dispatch/adapter/interface/tool_definition.rb
index 7b435a3..4a8ca5a 100644
--- a/lib/dispatch/adapter/interface/tool_definition.rb
+++ b/lib/dispatch/adapter/interface/tool_definition.rb
@@ -2,6 +2,18 @@
 
 module Dispatch
   module Adapter
-    ToolDefinition = Struct.new(:name, :description, :parameters, keyword_init: true)
+    # +cache_control+ values:
+    #   nil                                — no cache breakpoint (default)
+    #   { type: :ephemeral }               — provider default TTL
+    #   { type: :ephemeral, ttl: :"5m" }   — short-lived cache
+    #   { type: :ephemeral, ttl: :"1h" }   — long-lived cache
+    ToolDefinition = Struct.new(
+      :name, :description, :parameters, :cache_control,
+      keyword_init: true
+    ) do
+      def initialize(name:, description:, parameters:, cache_control: nil)
+        super
+      end
+    end
   end
 end