diff --git a/python/packages/redis/agent_framework_redis/_context_provider.py b/python/packages/redis/agent_framework_redis/_context_provider.py
index 4886731c99f..cf6d3175f90 100644
--- a/python/packages/redis/agent_framework_redis/_context_provider.py
+++ b/python/packages/redis/agent_framework_redis/_context_provider.py
@@ -295,7 +295,7 @@ def _schema_signature(schema: dict[str, Any]) -> dict[str, Any]:
             return sig
 
         existing_index: Any = await AsyncSearchIndex.from_existing(  # pyright: ignore[reportUnknownMemberType]
-            self.index_name, redis_url=self.redis_url
+            self.index_name, redis_client=self.redis_index.client
         )
         existing_schema = existing_index.schema.to_dict()
         current_schema = self.schema_dict
diff --git a/python/packages/redis/tests/test_context_provider_edges.py b/python/packages/redis/tests/test_context_provider_edges.py
index ea6287ffe37..155c81ee495 100644
--- a/python/packages/redis/tests/test_context_provider_edges.py
+++ b/python/packages/redis/tests/test_context_provider_edges.py
@@ -121,6 +121,48 @@ async def test_validate_schema_compatibility_raises_for_significant_mismatch(
         await provider._validate_schema_compatibility()
 
 
+@pytest.mark.parametrize("borrowed_index", [False, True])
+@pytest.mark.parametrize("compatible_schema", [False, True])
+async def test_existing_index_schema_check_uses_the_active_connection(
+    mock_index: AsyncMock,
+    patch_index: MagicMock,
+    borrowed_index: bool,
+    compatible_schema: bool,
+) -> None:
+    client = MagicMock()
+    mock_index.client = client
+    mock_index.exists.return_value = True
+    provider = RedisContextProvider(
+        source_id="ctx",
+        user_id="user-1",
+        redis_index=mock_index if borrowed_index else None,
+    )
+    existing_schema = provider.schema_dict
+    if not compatible_schema:
+        existing_schema = {**existing_schema, "index": {**existing_schema["index"], "prefix": "other"}}
+    existing_index = MagicMock()
+    existing_index.schema.to_dict.return_value = existing_schema
+
+    async def fetch_schema(name: str, **kwargs: Any) -> MagicMock:
+        assert name == provider.index_name
+        # The supplied index may use a different server or non-URL credentials.
+        if kwargs.get("redis_client") is not client or "redis_url" in kwargs:
+            raise ConnectionError("Schema lookup reached a different Redis connection")
+        return existing_index
+
+    patch_index.from_existing.side_effect = fetch_schema
+
+    if compatible_schema:
+        await provider._ensure_index()
+        mock_index.create.assert_awaited_once_with(overwrite=False, drop=False)
+        assert provider._index_initialized is True
+    else:
+        with pytest.raises(ValueError, match="overwrite_index=True"):
+            await provider._ensure_index()
+        mock_index.create.assert_not_awaited()
+        assert provider._index_initialized is False
+
+
 async def test_add_requires_content_field(
     patch_index: MagicMock,  # noqa: ARG001
 ) -> None:
diff --git a/python/packages/redis/tests/test_providers.py b/python/packages/redis/tests/test_providers.py
index 711c63e7686..89e9574aab6 100644
--- a/python/packages/redis/tests/test_providers.py
+++ b/python/packages/redis/tests/test_providers.py
@@ -48,7 +48,7 @@ def patch_index_from_dict(mock_index: AsyncMock):
     with patch("agent_framework_redis._context_provider.AsyncSearchIndex") as mock_cls:
         mock_cls.from_dict = MagicMock(return_value=mock_index)
 
-        async def mock_from_existing(index_name: str, redis_url: str):  # noqa: ARG001
+        async def mock_from_existing(index_name: str, redis_client: Any):  # noqa: ARG001
             mock_existing = AsyncMock()
             mock_existing.schema.to_dict = MagicMock(
                 side_effect=lambda: mock_cls.from_dict.call_args[0][0] if mock_cls.from_dict.call_args else {}