diff --git a/pyflowlauncher/jsonrpc.py b/pyflowlauncher/jsonrpc.py
index fa8e477..cde22ba 100644
--- a/pyflowlauncher/jsonrpc.py
+++ b/pyflowlauncher/jsonrpc.py
@@ -75,7 +75,10 @@ async def messages(self):
                     _logger.warning(
                         "Discarding JSON-RPC response with unknown id: %r", req_id)
                 elif not fut.done():
-                    fut.set_result(msg.get('result'))
+                    if 'error' in msg and msg['error'] is not None:
+                        fut.set_exception(RuntimeError(msg['error']))
+                    else:
+                        fut.set_result(msg.get('result'))
                 continue
             yield msg
 
diff --git a/pyflowlauncher/launcher.py b/pyflowlauncher/launcher.py
index dcbf27b..ecebb1a 100644
--- a/pyflowlauncher/launcher.py
+++ b/pyflowlauncher/launcher.py
@@ -216,33 +216,36 @@ async def _handle_request(
             # JsonRPCExecuteResponse, so the command must be sent as our own
             # request instead of being dropped.
             try:
-                await self._forward_to_host(result['Method'], list(result.get('Parameters', [])))
+                succeeded = await self._forward_to_host(
+                    result['Method'], list(result.get('Parameters', [])))
             except asyncio.CancelledError:
                 self._client.send({'id': request_id, 'result': None, 'error': {
                     'code': -32800, 'message': 'Request cancelled',
                 }})
                 raise
-            self._respond(request_id, {'hide': True})
+            self._respond(request_id, {'hide': succeeded})
             return
         self._send_response(request_id, method, result)
 
     async def _handle_builtin_action(self, request_id: Any, method: str, params: list) -> None:
         try:
-            await self._forward_to_host(method, params)
+            succeeded = await self._forward_to_host(method, params)
         except asyncio.CancelledError:
             self._client.send({'id': request_id, 'result': None, 'error': {
                 'code': -32800, 'message': 'Request cancelled',
             }})
             raise
-        self._respond(request_id, {'hide': True})
+        self._respond(request_id, {'hide': succeeded})
 
-    async def _forward_to_host(self, method: str, params: list) -> None:
+    async def _forward_to_host(self, method: str, params: list) -> bool:
         try:
             await self._client.request(_host_method(method), params)
+            return True
         except asyncio.CancelledError:
             raise
         except Exception:
             self.logger.exception("Failed to forward action %r to the host", method)
+            return False
 
     def _respond(self, request_id: Any, result: Any) -> None:
         """Send a response in the uniform {id, result, error} envelope."""
diff --git a/tests/integration/test_v2_protocol.py b/tests/integration/test_v2_protocol.py
index c244961..6dfe5a9 100644
--- a/tests/integration/test_v2_protocol.py
+++ b/tests/integration/test_v2_protocol.py
@@ -498,6 +498,68 @@ async def _inner():
         resp = query_response(responses, 5)
         assert resp.get('result', {}).get('debugMessage') != 'Internal error'
 
+    def test_builtin_action_error_reply_does_not_hide_window(self):
+        """Regression: a host-side JSON-RPC error forwarding a built-in action
+        must not be reported as {'hide': True} — the window should stay open
+        so the user can see something went wrong."""
+        plugin = make_plugin()
+
+        async def dispatch(method: str, params: list) -> Any:
+            return await plugin._event_handler.trigger_event(method, *params)
+
+        stdin_text = (
+            json.dumps({'id': 10, 'method': 'Flow.Launcher.OpenAppUri',
+                        'params': [['playnite://playnite/start/abc']]}) + '\n'
+            + json.dumps({'id': 1, 'error': {'code': -32601, 'message': 'not found'}}) + '\n'
+            + json.dumps({'id': 11, 'method': 'close', 'params': []}) + '\n'
+        )
+        responses = []
+
+        async def _inner():
+            with patch('sys.stdin', StringIO(stdin_text)), \
+                 patch('sys.stdout', StringIO()) as out:
+                await plugin._launcher.run(dispatch)
+                out.seek(0)
+                for line in out.read().splitlines():
+                    if line.strip():
+                        responses.append(json.loads(line))
+
+        asyncio.run(_inner())
+
+        original = query_response(responses, 10)
+        assert original['result'] == {'hide': False}
+        assert original.get('error') is None
+
+    def test_builtin_action_stream_closed_does_not_hide_window(self):
+        """Regression: if the stream closes before the host replies to a
+        forwarded action, the original request must not be reported as
+        {'hide': True}."""
+        plugin = make_plugin()
+
+        async def dispatch(method: str, params: list) -> Any:
+            return await plugin._event_handler.trigger_event(method, *params)
+
+        stdin_text = (
+            json.dumps({'id': 10, 'method': 'Flow.Launcher.OpenAppUri',
+                        'params': [['playnite://playnite/start/abc']]}) + '\n'
+        )
+        responses = []
+
+        async def _inner():
+            with patch('sys.stdin', StringIO(stdin_text)), \
+                 patch('sys.stdout', StringIO()) as out:
+                await plugin._launcher.run(dispatch)
+                out.seek(0)
+                for line in out.read().splitlines():
+                    if line.strip():
+                        responses.append(json.loads(line))
+
+        asyncio.run(_inner())
+
+        original = query_response(responses, 10)
+        assert original['result'] == {'hide': False}
+        assert original.get('error') is None
+
 
 class TestV2ReturnedCommands:
     """A registered action method that returns an api Command (issue #41).
diff --git a/tests/unit/test_launcher.py b/tests/unit/test_launcher.py
index f94771c..65ac224 100644
--- a/tests/unit/test_launcher.py
+++ b/tests/unit/test_launcher.py
@@ -325,8 +325,10 @@ async def _run():
         asyncio.run(_run())
         # StreamJsonRpc reads the 'result' member of the response, so 'hide'
         # must be nested inside it (deserialized as JsonRPCExecuteResponse).
+        # The host never replies to the forwarded action here, so the forward
+        # times out and 'hide' must be False (don't hide on a failed forward).
         action_resp = next(r for r in output if r.get('id') == 5)
-        assert action_resp == {'id': 5, 'result': {'hide': True}, 'error': None}
+        assert action_resp == {'id': 5, 'result': {'hide': False}, 'error': None}
 
     def test_query_response_includes_error_key(self):
         """All responses must carry the same {id, result, error} envelope."""