fix: use sequential when sub recipe task is 1. (#3573)

crates/goose/src/agents/recipe_tools/sub_recipe_tools.rs

@@ -73,10 +73,15 @@ fn create_tasks_from_params(
 }
 
 fn create_task_execution_payload(tasks: &[Task], sub_recipe: &SubRecipe) -> Value {
+    let execution_mode = if tasks.len() == 1 || sub_recipe.sequential_when_repeated {
+        ExecutionMode::Sequential
+    } else {
+        ExecutionMode::Parallel
+    };
     let task_ids: Vec<String> = tasks.iter().map(|task| task.id.clone()).collect();
     json!({
         "task_ids": task_ids,
-        "execution_mode": if sub_recipe.sequential_when_repeated { ExecutionMode::Sequential } else { ExecutionMode::Parallel },
+        "execution_mode": execution_mode,
     })
 }
 

crates/goose/src/agents/subagent_execution_tool/lib/mod.rs

@@ -25,18 +25,7 @@ pub async fn execute_tasks(
     )
     .map_err(|e| format!("Failed to parse task_ids: {}", e))?;
 
-    let mut tasks = Vec::new();
-    for task_id in &task_ids {
-        match tasks_manager.get_task(task_id).await {
-            Some(task) => tasks.push(task),
-            None => {
-                return Err(format!(
-                    "Task with ID '{}' not found in TasksManager",
-                    task_id
-                ))
-            }
-        }
-    }
+    let tasks = tasks_manager.get_tasks(&task_ids).await?;
 
     let task_count = tasks.len();
     match execution_mode {

crates/goose/src/agents/subagent_execution_tool/tasks_manager.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use std::collections::HashMap;
 use std::sync::Arc;
 use tokio::sync::RwLock;
@@ -33,6 +34,22 @@ impl TasksManager {
         let tasks = self.tasks.read().await;
         tasks.get(task_id).cloned()
     }
+
+    pub async fn get_tasks(&self, task_ids: &[String]) -> Result<Vec<Task>, String> {
+        let mut tasks = Vec::new();
+        for task_id in task_ids {
+            match self.get_task(task_id).await {
+                Some(task) => tasks.push(task),
+                None => {
+                    return Err(format!(
+                        "Task with ID '{}' not found in TasksManager",
+                        task_id
+                    ))
+                }
+            }
+        }
+        Ok(tasks)
+    }
 }
 
 #[cfg(test)]