diff --git a/crates/ide-agent/src/lib.rs b/crates/ide-agent/src/lib.rs
index c62073bf..c276076f 100644
--- a/crates/ide-agent/src/lib.rs
+++ b/crates/ide-agent/src/lib.rs
@@ -191,6 +191,8 @@ struct Task {
     dirty: Mutex<BTreeSet<usize>>,
     flush_scheduled: AtomicBool,
     stderr: Mutex<VecDeque<String>>,
+    /// Set by `delete`; held while saving, so a late save can't bring the file back.
+    deleted: Mutex<bool>,
 }
 
 impl AgentManager {
@@ -519,6 +521,7 @@ impl AgentManager {
             blocking(move || worktree::remove(&root, &cwd)).await?;
         }
         self.tasks.write().remove(id);
+        *task.deleted.lock() = true;
         let _ = std::fs::remove_file(self.shared.paths.store_dir.join(format!("{id}.json")));
         self.shared.emit(AgentEvent::Removed { id: id.to_owned() });
         Ok(())
@@ -568,6 +571,7 @@ impl Task {
             dirty: Mutex::new(BTreeSet::new()),
             flush_scheduled: AtomicBool::new(false),
             stderr: Mutex::new(VecDeque::new()),
+            deleted: Mutex::new(false),
         })
     }
 
@@ -604,6 +608,10 @@ impl Task {
             })
         };
         let path = self.shared.paths.store_dir.join(format!("{}.json", self.id));
+        let deleted = self.deleted.lock();
+        if *deleted {
+            return;
+        }
         if let Err(e) = bytes.map_err(|e| e.to_string()).and_then(|b| write_file(&path, &b)) {
             tracing::warn!("saving agent task {}: {e}", self.id);
         }