diff --git a/src/headless.rs b/src/headless.rs
index bc900eb..e56bac7 100644
--- a/src/headless.rs
+++ b/src/headless.rs
@@ -195,6 +195,10 @@ fn execute_once(configs: Vec<config::AgentConfig>) -> Result<(), String> {
     let all: Vec<usize> = (0..agents.len()).collect();
     let path = save_session(1, &agents, &decision, &all);
     eprintln!("  saved: {path}");
+
+    // Write done marker for background monitoring
+    atomic_write(&format!("{STATE_DIR}/done"), b"1");
+
     Ok(())
 }
 
@@ -297,6 +301,7 @@ fn run_once(configs: &[config::AgentConfig]) -> Result<(), String> {
         return run_with_configs(next);
     }
 
+    atomic_write(&format!("{STATE_DIR}/done"), b"1");
     Ok(())
 }
 
@@ -804,6 +809,32 @@ pub fn remember() {
     }
 }
 
+/// Wait for background run to complete, then show summary.
+pub fn wait_done() {
+    let done_path = format!("{STATE_DIR}/done");
+    eprint!("  waiting...");
+    loop {
+        if std::path::Path::new(&done_path).exists() {
+            eprintln!(" done");
+            let _ = std::fs::remove_file(&done_path);
+            // Show compact summary
+            status(false);
+            if let Ok(content) = std::fs::read_to_string(format!("{STATE_DIR}/decision.json")) {
+                if let Ok(d) = serde_json::from_str::<serde_json::Value>(&content) {
+                    let text = d["decision"].as_str().unwrap_or("");
+                    let first: String = text.lines()
+                        .filter(|l| !l.starts_with('#') && !l.is_empty())
+                        .take(3).collect::<Vec<_>>().join("\n");
+                    if !first.is_empty() { println!("\n{first}"); }
+                }
+            }
+            return;
+        }
+        std::thread::sleep(std::time::Duration::from_millis(500));
+        eprint!(".");
+    }
+}
+
 pub fn signal_next(save: Vec<usize>) {
     let save_val = if save.is_empty() {
         serde_json::json!(null)
diff --git a/src/main.rs b/src/main.rs
index 3c4d6b1..7e4ddcf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -120,6 +120,7 @@ fn main() {
                 std::process::exit(1);
             }
         }
+        Some("wait") => aishell::headless::wait_done(),
         Some("next") => {
             let save: Vec<usize> = env::args().skip(2)
                 .filter_map(|s| s.parse().ok())