diff --git a/rust/crates/rusty-claude-cli/src/main.rs b/rust/crates/rusty-claude-cli/src/main.rs
index 201e6d3..45c2ebb 100644
--- a/rust/crates/rusty-claude-cli/src/main.rs
+++ b/rust/crates/rusty-claude-cli/src/main.rs
@@ -6541,11 +6541,15 @@ mod tests {
     }
 
     fn temp_dir() -> PathBuf {
+        use std::sync::atomic::{AtomicU64, Ordering};
+
+        static COUNTER: AtomicU64 = AtomicU64::new(0);
         let nanos = SystemTime::now()
             .duration_since(UNIX_EPOCH)
             .expect("time should be after epoch")
             .as_nanos();
-        std::env::temp_dir().join(format!("rusty-claude-cli-{nanos}"))
+        let unique = COUNTER.fetch_add(1, Ordering::Relaxed);
+        std::env::temp_dir().join(format!("rusty-claude-cli-{nanos}-{unique}"))
     }
 
     fn git(args: &[&str], cwd: &Path) {