diff --git a/apps/memos-local-plugin/adapters/hermes/memos_provider/__init__.py b/apps/memos-local-plugin/adapters/hermes/memos_provider/__init__.py
index e2389e498..3e9adcee4 100644
--- a/apps/memos-local-plugin/adapters/hermes/memos_provider/__init__.py
+++ b/apps/memos-local-plugin/adapters/hermes/memos_provider/__init__.py
@@ -514,6 +514,7 @@ def initialize(self, session_id: str, **kwargs: Any) -> None:  # type: ignore[ov
                         MemosBridgeClient(
                             runtime_home=home,
                             extra_env=env,
+                            owner_id=f"provider-{id(self)}",
                         )
                     ),
                     before_spawn=lambda home=runtime_home: _prepare_shared_bridge(home),
@@ -526,6 +527,7 @@ def initialize(self, session_id: str, **kwargs: Any) -> None:  # type: ignore[ov
                 new_bridge = MemosBridgeClient(
                     runtime_home=str(runtime_home),
                     extra_env=runtime_env,
+                    owner_id=f"provider-{id(self)}",
                 )
                 new_bridge.register_host_handler(
                     "host.llm.complete",
@@ -2195,6 +2197,7 @@ def _reconnect_bridge(self, session_id: str = "", *, timeout: float = 30.0) -> N
                             MemosBridgeClient(
                                 runtime_home=home,
                                 extra_env=env,
+                                owner_id=f"provider-{id(self)}",
                             )
                         ),
                         before_spawn=lambda home=runtime_home: _prepare_shared_bridge(home),
@@ -2261,6 +2264,7 @@ def _reconnect_bridge(self, session_id: str = "", *, timeout: float = 30.0) -> N
                 new_bridge = MemosBridgeClient(
                     runtime_home=str(runtime_home),
                     extra_env=runtime_env,
+                    owner_id=f"provider-{id(self)}",
                 )
                 logger.info(
                     "MemOS: new bridge created (pid=%s)",
diff --git a/apps/memos-local-plugin/adapters/hermes/memos_provider/bridge_client.py b/apps/memos-local-plugin/adapters/hermes/memos_provider/bridge_client.py
index e137729ed..650cda763 100644
--- a/apps/memos-local-plugin/adapters/hermes/memos_provider/bridge_client.py
+++ b/apps/memos-local-plugin/adapters/hermes/memos_provider/bridge_client.py
@@ -46,7 +46,7 @@
 # This is the Python-side guard against issue #1910 (bridge process leak:
 # every turn spawns new bridge.cjs). Defence in depth on the Node side
 # lives in ``bridge.cts`` via ``bridge-stdio.pid``.
-_ACTIVE_CLIENTS: dict[tuple[str, bool, str], MemosBridgeClient] = {}
+_ACTIVE_CLIENTS: dict[tuple[str, bool, str, str], MemosBridgeClient] = {}
 _ACTIVE_CLIENTS_LOCK = threading.Lock()
 
 
@@ -150,6 +150,7 @@ def __init__(
         no_viewer: bool = True,
         extra_env: dict[str, str] | None = None,
         runtime_home: str | None = None,
+        owner_id: str | None = None,
     ) -> None:
         self._lock = threading.Lock()
         self._next_id = 1
@@ -265,6 +266,10 @@ def __init__(
         self._singleton_agent = agent
         self._singleton_no_viewer = bool(no_viewer)
         self._singleton_runtime_home = str(resolved_runtime_home)
+        # owner-keying: widen the singleton tracker key to (agent, no_viewer, home,
+        # owner_id) so concurrent provider instances in ONE process (gateway
+        # email/cron/subagent sessions) do not reap each other's bridges.
+        self._singleton_owner = owner_id or f"anon-{id(self)}"
         previous = self._register_active()
         if previous is not None and previous is not self:
             prev_pid = getattr(previous, "pid", "?")
@@ -282,6 +287,7 @@ def _register_active(self) -> MemosBridgeClient | None:
             self._singleton_agent,
             self._singleton_no_viewer,
             self._singleton_runtime_home,
+            self._singleton_owner,
         )
         with _ACTIVE_CLIENTS_LOCK:
             previous = _ACTIVE_CLIENTS.get(key)
@@ -294,6 +300,7 @@ def _unregister_active(self) -> None:
             self._singleton_agent,
             self._singleton_no_viewer,
             self._singleton_runtime_home,
+            self._singleton_owner,
         )
         with _ACTIVE_CLIENTS_LOCK:
             if _ACTIVE_CLIENTS.get(key) is self: