feat(agent): add raw control sender

.fernignore

@@ -24,6 +24,7 @@ src/deepgram/listen/v2/types/_dict_compat.py
 # - _sanitize_numeric_types in agent socket client (float→int for API)
 # - optional message param on control send_ methods (send_keep_alive, send_close_stream, etc.)
 #   so users don't need to instantiate the type themselves for no-payload control messages
+# - agent/v1 send_raw: public raw-control sender for protocol-transparent bridges
 # - listen/v2 send_configure: runtime tolerance for a raw dict alongside the
 #   generated ListenV2Configure model
 # [temporarily frozen — manual patches listed above]

AGENTS.md

@@ -66,7 +66,7 @@ Current temporarily frozen files:
 - `src/deepgram/types/speak_settings_v1provider.py`, `src/deepgram/types/deepgram.py` — validate Agent TTS `expressivity` as `pydantic.StrictInt` so Pydantic v1 rejects fractional values instead of truncating them before they reach the API. Regression coverage in `tests/custom/test_socket_client_shims.py`. Unfreeze when Fern emits a strict integer.
 - `src/deepgram/listen/v1/socket_client.py` — same
 - `src/deepgram/listen/v2/socket_client.py` — same (broad except, optional `send_close_stream` default). As of the 2026-08-11 regen the generator properly types `send_configure(ListenV2Configure)` and puts `ListenV2ConfigureSuccess` in the response Union, so those are taken from the generator; the only `send_configure` patch retained is runtime tolerance for a raw dict (sent verbatim) for back-compat with pre-typed-model callers
-- `src/deepgram/agent/v1/socket_client.py` — same + `_sanitize_numeric_types`
+- `src/deepgram/agent/v1/socket_client.py` — same + `_sanitize_numeric_types` and public `send_raw()` for protocol-transparent control-frame bridges
 - `src/deepgram/agent/v1/types/agent_v1settings_agent_context.py`, `src/deepgram/agent/v1/types/agent_v1settings_agent.py`, `src/deepgram/agent/v1/types/agent_v1settings.py`, `src/deepgram/agent/v1/requests/agent_v1settings_agent_context.py`, `src/deepgram/agent/v1/requests/agent_v1settings_agent.py`, `src/deepgram/agent/v1/requests/agent_v1settings.py` — backward-compat patches for the 2026-05-05 Agent Settings schema restructure. These preserve callable `AgentV1SettingsAgent(...)`, keep `AgentV1Settings.agent` accepting both that wrapper and `agent_id` strings, restore the legacy request TypedDict shapes, remap legacy `messages=[...]` / nested `context=AgentV1SettingsAgentContext(messages=[...])` usage into the new `context={"messages": [...]}` wire shape, and keep read-side `obj.messages` access working.
 - `src/deepgram/core/api_error.py`, `src/deepgram/core/parse_error.py` — credential redaction. Every websocket `connect()` path raises `ApiError(headers=dict(headers), ...)` with the full request headers, and both error types stringify that dict, so an unredacted `Authorization` reached `str(e)`, tracebacks, log aggregators and error trackers (which serialise attributes as well as the message). Both now mask credential values at construction via `_secure_logging.redact_sensitive_headers`, preserving non-sensitive headers (`dg-request-id`) for debugging. This is the same threat `_secure_logging.py` covers for the `websockets` DEBUG handshake logs, via the other path to it. Regression coverage in `tests/custom/test_api_error_redaction.py`. Unfreeze if the generator starts redacting credentials itself.
 - `src/deepgram/core/query_encoder.py` — coerces Python bools to lowercase `"true"`/`"false"` before they reach `urllib.parse.urlencode` (which would otherwise produce `"True"`/`"False"` via `str()` and break websocket query strings). Only the four `*/connect()` paths call `urlencode`; HTTP raw clients hand params to httpx, which lowercases bools itself, so the patch is a no-op for the HTTP path. Once Fern's websocket codegen normalizes bools (or the spec types these as `boolean` end-to-end), this can be unfrozen.

src/deepgram/agent/v1/socket_client.py

@@ -198,6 +198,15 @@ async def send_force_end_turn(self, message: typing.Optional[AgentV1ForceEndTurn
         """
         await self._send_model(message or AgentV1ForceEndTurn(type="ForceEndTurn"))
 
+    async def send_raw(self, message: typing.Union[typing.Dict[str, typing.Any], str]) -> None:
+        """Send a JSON control frame without model validation.
+
+        Dictionaries are serialized to JSON. Serialized JSON strings are sent
+        unchanged, allowing protocol-transparent bridges to forward unknown
+        control frames.
+        """
+        await self._send(message)
+
     async def send_media(self, message: bytes) -> None:
         """
         Send a message to the websocket connection.
@@ -352,6 +361,15 @@ def send_force_end_turn(self, message: typing.Optional[AgentV1ForceEndTurn] = No
         """
         self._send_model(message or AgentV1ForceEndTurn(type="ForceEndTurn"))
 
+    def send_raw(self, message: typing.Union[typing.Dict[str, typing.Any], str]) -> None:
+        """Send a JSON control frame without model validation.
+
+        Dictionaries are serialized to JSON. Serialized JSON strings are sent
+        unchanged, allowing protocol-transparent bridges to forward unknown
+        control frames.
+        """
+        self._send(message)
+
     def send_media(self, message: bytes) -> None:
         """
         Send a message to the websocket connection.

tests/custom/test_socket_client_shims.py

@@ -178,6 +178,30 @@ async def test_agent_force_end_turn_async_no_arg(self):
         assert _sent_json(ws) == {"type": "ForceEndTurn"}
 
 
+class TestAgentRawControlSender:
+    def test_sync_send_raw_serializes_an_unknown_control_frame(self):
+        ws = _FakeWebSocket()
+        V1SocketClient(websocket=ws).send_raw({"type": "FutureControl", "sample_rate": 44100.0})
+        assert ws.sent == ['{"type": "FutureControl", "sample_rate": 44100.0}']
+
+    def test_sync_send_raw_preserves_serialized_json(self):
+        ws = _FakeWebSocket()
+        message = '{"type":"FutureControl","option":true}'
+        V1SocketClient(websocket=ws).send_raw(message)
+        assert ws.sent == [message]
+
+    async def test_async_send_raw_serializes_an_unknown_control_frame(self):
+        ws = _FakeAsyncWebSocket()
+        await AsyncV1SocketClient(websocket=ws).send_raw({"type": "FutureControl", "sample_rate": 44100.0})
+        assert ws.sent == ['{"type": "FutureControl", "sample_rate": 44100.0}']
+
+    async def test_async_send_raw_preserves_serialized_json(self):
+        ws = _FakeAsyncWebSocket()
+        message = '{"type":"FutureControl","option":true}'
+        await AsyncV1SocketClient(websocket=ws).send_raw(message)
+        assert ws.sent == [message]
+
+
 class TestAgentSettingsSerialization:
     @pytest.mark.parametrize("expressivity", [1.5, True, "2"])
     def test_expressivity_requires_a_plain_integer(self, expressivity):