diff --git a/hive-c0re/src/coordinator.rs b/hive-c0re/src/coordinator.rs
index ad151a8..6f348cf 100644
--- a/hive-c0re/src/coordinator.rs
+++ b/hive-c0re/src/coordinator.rs
@@ -118,6 +118,10 @@ impl Coordinator {
         }
     }
 
+    pub fn list_agents(&self) -> Vec<String> {
+        self.agents.lock().unwrap().keys().cloned().collect()
+    }
+
     /// Mark an agent as in-progress (only one state per agent for now).
     pub fn set_transient(&self, name: &str, kind: TransientKind) {
         self.transient.lock().unwrap().insert(
diff --git a/hive-c0re/src/main.rs b/hive-c0re/src/main.rs
index 663f0ad..5908b7b 100644
--- a/hive-c0re/src/main.rs
+++ b/hive-c0re/src/main.rs
@@ -157,6 +157,52 @@ async fn main() -> Result<()> {
             // when a previously-running container goes away without an
             // operator-initiated transient state.
             crash_watch::spawn(coord.clone());
+            // Reminder scheduler: checks for due reminders every 5 seconds,
+            // delivers them as inbox messages from "reminder".
+            let reminder_coord = coord.clone();
+            tokio::spawn(async move {
+                use hive_sh4re::Message;
+                loop {
+                    // Get all agents currently registered
+                    let agents = reminder_coord.list_agents();
+                    for agent in agents {
+                        match reminder_coord.broker.get_due_reminders(&agent) {
+                            Ok(reminders) => {
+                                for (id, message, _file_path) in reminders {
+                                    // Deliver as inbox message from "reminder"
+                                    if let Err(e) = reminder_coord.broker.send(&Message {
+                                        from: "reminder".to_owned(),
+                                        to: agent.clone(),
+                                        body: message.clone(),
+                                    }) {
+                                        tracing::warn!(
+                                            reminder_id = id,
+                                            %agent,
+                                            error = ?e,
+                                            "failed to deliver reminder"
+                                        );
+                                        continue;
+                                    }
+                                    // Mark as sent
+                                    if let Err(e) = reminder_coord.broker.mark_reminder_sent(id) {
+                                        tracing::warn!(
+                                            reminder_id = id,
+                                            error = ?e,
+                                            "failed to mark reminder sent"
+                                        );
+                                    }
+                                }
+                            }
+                            Err(e) => tracing::warn!(
+                                %agent,
+                                error = ?e,
+                                "failed to query due reminders"
+                            ),
+                        }
+                    }
+                    tokio::time::sleep(std::time::Duration::from_secs(5)).await;
+                }
+            });
             let dash_coord = coord.clone();
             tokio::spawn(async move {
                 if let Err(e) = dashboard::serve(dashboard_port, dash_coord).await {