diff --git a/src/auto-reply/reply/session.ts b/src/auto-reply/reply/session.ts
index a70ff6909d6..36131932bb4 100644
--- a/src/auto-reply/reply/session.ts
+++ b/src/auto-reply/reply/session.ts
@@ -558,7 +558,6 @@ export async function initSessionState(params: {
     },
   );
 
-  // When a session is auto-reset (idle timeout or daily reset), emit a
   // When a session is auto-reset (idle timeout or daily reset), emit a
   // session:reset internal hook so the session-memory hook can persist
   // the outgoing session context — just as it does for manual /new and /reset.
@@ -566,6 +565,17 @@ export async function initSessionState(params: {
   // the handler reads it, getRecentSessionContentWithResetFallback() will
   // locate it via the .reset.* sibling naming convention.
   if (isNewSession && !resetTriggered && previousSessionEntry) {
+    const workspaceDir = resolveAgentWorkspaceDir(cfg, agentId);
+    const autoResetEvent = createInternalHookEvent("session", "reset", sessionKey, {
+      sessionEntry,
+      previousSessionEntry,
+      commandSource: "auto-reset",
+      workspaceDir,
+      cfg,
+    });
+    void triggerInternalHook(autoResetEvent).catch((err) => {
+      log.debug("session:reset hook error (auto-reset)", { error: String(err) });
+    });
   }
 
   // Archive old transcript so it doesn't accumulate on disk (#14869).