need to enable the subagent tool whenever subrecipes are specified

crates/goose-cli/src/session/builder.rs

@@ -497,6 +497,8 @@ pub async fn build_session(session_config: SessionBuilderConfig) -> CliSession {
         }
     }
 
+    agent_ptr.ensure_subagent_for_recipes().await;
+
     // Determine editor mode
     let edit_mode = config
         .get_param::<String>("EDIT_MODE")

crates/goose-server/src/routes/recipe_utils.rs

@@ -170,6 +170,8 @@ pub async fn apply_recipe_to_agent(
         )
         .await;
 
+    agent.ensure_subagent_for_recipes().await;
+
     recipe.instructions.as_ref().map(|instructions| {
         let mut context: HashMap<&str, Value> = HashMap::new();
         context.insert("recipe_instructions", Value::String(instructions.clone()));

crates/goose/src/agents/agent.rs

@@ -407,8 +407,8 @@ impl Agent {
         response: Option<Response>,
         include_final_output: bool,
     ) {
-        if let Some(sub_recipes) = sub_recipes {
-            self.add_sub_recipes(sub_recipes).await;
+        if let Some(ref sub_recipes) = sub_recipes {
+            self.add_sub_recipes(sub_recipes.clone()).await;
         }
 
         if include_final_output {
@@ -418,6 +418,15 @@ impl Agent {
         }
     }
 
+    pub async fn ensure_subagent_for_recipes(&self) {
+        let has_sub_recipes = !self.sub_recipes.read().await.is_empty();
+        if has_sub_recipes {
+            if let Err(e) = self.enable_subagent_extension().await {
+                warn!("Failed to enable subagent extension for recipe: {}", e);
+            }
+        }
+    }
+
     /// Dispatch a single tool call to the appropriate client
     #[instrument(skip(self, tool_call, request_id), fields(input, output))]
     pub async fn dispatch_tool_call(