Skip subagents for gemini (#5257)

Co-authored-by: Douwe Osinga <douwe@squareup.com>

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

@@ -27,6 +27,7 @@ pub struct CreateDynamicTaskParams {
 
     /// How to execute multiple tasks (default: parallel for multiple tasks, sequential for single task)
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[schemars(with = "Option<String>")]
     pub execution_mode: Option<ExecutionModeParam>,
 }
 
@@ -90,6 +91,18 @@ pub struct TaskParameter {
     pub return_last_only: Option<bool>,
 }
 
+pub fn should_enabled_subagents(model_name: &str) -> bool {
+    let config = crate::config::Config::global();
+    let is_autonomous = config.get_param("GOOSE_MODE").unwrap_or("auto".to_string()) == "auto";
+    if !is_autonomous {
+        return false;
+    }
+    if model_name.starts_with("gemini") {
+        return false;
+    }
+    true
+}
+
 pub fn create_dynamic_task_tool() -> Tool {
     let schema = schema_for!(CreateDynamicTaskParams);
     let schema_value =