diff --git a/packages/narada-pyodide/pyproject.toml b/packages/narada-pyodide/pyproject.toml
index 0a90196..a77c8bd 100644
--- a/packages/narada-pyodide/pyproject.toml
+++ b/packages/narada-pyodide/pyproject.toml
@@ -1,7 +1,7 @@
 
 [project]
 name = "narada-pyodide"
-version = "0.0.57"
+version = "0.0.58"
 description = "Pyodide-compatible Python client SDK for Narada"
 license = "Apache-2.0"
 readme = "README.md"
diff --git a/packages/narada-pyodide/src/narada/client.py b/packages/narada-pyodide/src/narada/client.py
index fb7576a..9d6886d 100644
--- a/packages/narada-pyodide/src/narada/client.py
+++ b/packages/narada-pyodide/src/narada/client.py
@@ -84,11 +84,19 @@ async def open_and_initialize_cloud_browser_window(
             user_id=self._user_id,
             env=self._env,
         )
-        request_body = {
+        request_body: dict[str, Any] = {
             "session_name": session_name,
             "session_timeout": session_timeout,
             "require_extension": require_extension,
         }
+        initiator_remote_dispatch_request_id = os.environ.get(
+            "NARADA_INITIATOR_REMOTE_DISPATCH_REQUEST_ID", ""
+        ).strip()
+        if not initiator_remote_dispatch_request_id:
+            raise ValueError("NARADA_INITIATOR_REMOTE_DISPATCH_REQUEST_ID is required")
+        request_body["initiator_remote_dispatch_request_id"] = (
+            initiator_remote_dispatch_request_id
+        )
 
         response = None
         max_attempts = 3
diff --git a/packages/narada-pyodide/tests/test_cloud_browser.py b/packages/narada-pyodide/tests/test_cloud_browser.py
index c5b4081..7098da3 100644
--- a/packages/narada-pyodide/tests/test_cloud_browser.py
+++ b/packages/narada-pyodide/tests/test_cloud_browser.py
@@ -96,6 +96,9 @@ def new() -> SimpleNamespace:
 async def test_open_and_initialize_cloud_browser_window_maps_response(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
+    monkeypatch.setenv(
+        "NARADA_INITIATOR_REMOTE_DISPATCH_REQUEST_ID", "request-maps-123"
+    )
     pyfetch = AsyncMock(
         return_value=_FakeResponse(
             json_data={
@@ -132,6 +135,53 @@ async def test_open_and_initialize_cloud_browser_window_maps_response(
         "session_name": "demo",
         "session_timeout": 321,
         "require_extension": False,
+        "initiator_remote_dispatch_request_id": "request-maps-123",
+    }
+
+
+@pytest.mark.asyncio
+async def test_open_and_initialize_cloud_browser_window_requires_initiator_env(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.delenv("NARADA_INITIATOR_REMOTE_DISPATCH_REQUEST_ID", raising=False)
+    pyfetch = AsyncMock()
+    narada_pkg, _, _ = _import_pyodide_narada(monkeypatch, pyfetch=pyfetch)
+
+    client = narada_pkg.Narada(api_key="test-api-key")
+    with pytest.raises(ValueError, match="NARADA_INITIATOR_REMOTE_DISPATCH_REQUEST_ID"):
+        await client.open_and_initialize_cloud_browser_window()
+
+    pyfetch.assert_not_awaited()
+
+
+@pytest.mark.asyncio
+async def test_open_and_initialize_cloud_browser_window_includes_initiator_request(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv(
+        "NARADA_INITIATOR_REMOTE_DISPATCH_REQUEST_ID", " request-local-123 "
+    )
+    pyfetch = AsyncMock(
+        return_value=_FakeResponse(
+            json_data={
+                "session_id": "session-123",
+                "session_name": "demo",
+                "browser_window_id": "browser-window-123",
+            }
+        )
+    )
+    narada_pkg, _, _ = _import_pyodide_narada(monkeypatch, pyfetch=pyfetch)
+
+    client = narada_pkg.Narada(api_key="test-api-key")
+    await client.open_and_initialize_cloud_browser_window()
+
+    call = pyfetch.await_args
+    assert call is not None
+    assert json.loads(call.kwargs["body"]) == {
+        "session_name": None,
+        "session_timeout": None,
+        "require_extension": True,
+        "initiator_remote_dispatch_request_id": "request-local-123",
     }
 
 
@@ -142,6 +192,9 @@ async def test_open_and_initialize_cloud_browser_window_supports_frontend_bearer
     monkeypatch.delenv("NARADA_API_KEY", raising=False)
     monkeypatch.setenv("NARADA_USER_ID", "user-123")
     monkeypatch.setenv("NARADA_ENV", "dev")
+    monkeypatch.setenv(
+        "NARADA_INITIATOR_REMOTE_DISPATCH_REQUEST_ID", "request-bearer-123"
+    )
 
     pyfetch = AsyncMock(
         side_effect=[
diff --git a/packages/narada/src/narada/window.py b/packages/narada/src/narada/window.py
index 494a976..e5b963a 100644
--- a/packages/narada/src/narada/window.py
+++ b/packages/narada/src/narada/window.py
@@ -24,10 +24,10 @@
 from narada_core.actions.critic import run_critic
 from narada_core.actions.models import (
     DEFAULT_HITL_TIMEOUT_SECONDS,
-    AgenticMouseAction,
-    AgenticMouseActionRequest,
     AgenticMatchingSelectorsFinderRequest,
     AgenticMatchingSelectorsFinderResponse,
+    AgenticMouseAction,
+    AgenticMouseActionRequest,
     AgenticSelectorAction,
     AgenticSelectorRequest,
     AgenticSelectorResponse,
diff --git a/uv.lock b/uv.lock
index 2194bba..06f9677 100644
--- a/uv.lock
+++ b/uv.lock
@@ -356,7 +356,7 @@ requires-dist = [{ name = "pydantic", specifier = "==2.12.5" }]
 
 [[package]]
 name = "narada-pyodide"
-version = "0.0.57"
+version = "0.0.58"
 source = { editable = "packages/narada-pyodide" }
 dependencies = [
     { name = "narada-core" },