feat: AgentManager - foundation for unified execution (#4389) (#4684)

crates/goose/src/agents/context.rs

@@ -33,7 +33,7 @@ impl Agent {
         // Only add an assistant message if we have room for it and it won't cause another overflow
         let assistant_message = Message::assistant().with_text("I had run into a context length exceeded error so I truncated some of the oldest messages in our conversation.");
         let assistant_tokens =
-            token_counter.count_chat_tokens("", &[assistant_message.clone()], &[]);
+            token_counter.count_chat_tokens("", std::slice::from_ref(&assistant_message), &[]);
 
         let current_total: usize = new_token_counts.iter().sum();
         if current_total + assistant_tokens <= target_context_limit {

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

@@ -45,7 +45,7 @@ pub async fn execute_single_task(
         .await;
 
     let execution_time = start_time.elapsed().as_millis();
-    let stats = calculate_stats(&[result.clone()], execution_time);
+    let stats = calculate_stats(std::slice::from_ref(&result), execution_time);
 
     ExecutionResponse {
         status: EXECUTION_STATUS_COMPLETED.to_string(),