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litellm/tests/unit/proxy/response_api_endpoints/test_endpoints.py
devin-ai-integration[bot] 25109a523b
test(proxy): move utils, agent_endpoints and endpoint tests into tests/unit/proxy (#44006) 
* test(proxy): move utils, agent_endpoints and endpoint tests into tests/unit/proxy

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* test(proxy): package moved unit test directories

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* test(proxy): exclude proxy-db-owned files from the misc target

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* test(proxy): drop the redundant fixture docstrings in the proxy conftest

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

---------

Co-authored-by: yuneng <yuneng@berri.ai>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
2026-10-01 11:06:42 -07:00

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"""
Test for response_api_endpoints/endpoints.py
"""
import unittest
from collections.abc import Mapping
from typing import Any, Final, Literal
from unittest.mock import AsyncMock, MagicMock, patch
import httpx
import pytest
import respx
from fastapi.testclient import TestClient
from httpx import Response
import litellm
from litellm.proxy.proxy_server import app
from litellm.types.llms.openai import ResponsesAPIResponse
@pytest.mark.asyncio
@pytest.mark.parametrize(
"path,error_kind",
[
("/v1/responses", "rate_limit"),
("/v1/responses", "numeric_rate_limit"),
("/v1/responses", "server_error"),
("/v1/responses", "response_failed"),
("/v1/responses", "cyber_policy"),
("/cursor/chat/completions", "server_error"),
("/v1/chat/completions", "server_error"),
],
)
async def test_streaming_upstream_errors_keep_the_client_protocol(
monkeypatch: pytest.MonkeyPatch,
path: str,
error_kind: Literal["rate_limit", "numeric_rate_limit", "server_error", "response_failed", "cyber_policy"],
) -> None:
import litellm.proxy.proxy_server as ps
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
model: Final = "gpt-6-astra"
message: Final = "Upstream cannot complete this response"
code: Final = {
"rate_limit": "rate_limit_exceeded", "numeric_rate_limit": "429",
"server_error": "server_error", "response_failed": "server_error", "cyber_policy": "cyber_policy",
}[error_kind]
error: Final = {"message": message, "code": code, "type": None, "param": "input"}
response: Final = {"id": "resp_upstream", "object": "response", "created_at": 1,
"status": "in_progress", "model": model, "output": [],
"parallel_tool_calls": True, "tool_choice": "auto", "tools": []}
created: Final = {"type": "response.created", "sequence_number": 0, "response": response}
tool_added: Final = {"type": "response.output_item.added", "sequence_number": 1, "output_index": 0,
"item": {"type": "function_call", "id": "fc_partial", "call_id": "call_partial",
"name": "read_file", "arguments": "", "status": "in_progress"}}
tool_delta: Final = {"type": "response.function_call_arguments.delta", "sequence_number": 2,
"item_id": "fc_partial", "output_index": 0, "delta": '{"path":"partial'}
failed: Final = (
{"type": "response.failed", "sequence_number": 9,
"response": {**response, "status": "failed", "error": error}}
if error_kind in ("response_failed", "cyber_policy") else {"type": "error", "error": error}
)
chat: Final = {"id": "chatcmpl_partial", "object": "chat.completion.chunk", "created": 1,
"model": model, "choices": [{"index": 0, "delta": {"content": "partial"},
"finish_reason": None}]}
is_chat: Final = path == "/v1/chat/completions"
partial: Final = path != "/v1/responses" or error_kind in ("numeric_rate_limit", "response_failed", "cyber_policy")
response_events: Final = (created, tool_added, tool_delta, failed) if partial else (failed,)
upstream_events: Final = (chat, {"error": error}) if is_chat else response_events
wire: Final = "".join("data: " + json.dumps(event) + "\n\n" for event in upstream_events)
upstream_url: Final = "https://streaming.example/v1"
router: Final = litellm.Router(
model_list=[{"model_name": model, "litellm_params": {
"model": "openai/" + model, "api_base": upstream_url, "api_key": "fixture-key"}}],
num_retries=0,
)
monkeypatch.setattr(ps, "llm_router", router)
monkeypatch.setattr(litellm, "disable_aiohttp_transport", True)
monkeypatch.setitem(app.dependency_overrides, user_api_key_auth, _auth_override)
with respx.mock as transport:
transport.post(upstream_url + ("/chat/completions" if is_chat else "/responses")).respond(
200, content=wire, headers={"Content-Type": "text/event-stream"}
)
async with httpx.AsyncClient(transport=httpx.ASGITransport(app), base_url="http://testserver") as client:
result: Final = await client.post(
path, json={
"model": model, "stream": True,
**({"messages": [{"role": "user", "content": "hello"}]} if is_chat else {"input": "hello"}),
},
)
frames: Final = tuple(frame for frame in result.text.split("\n\n") if "data: " in frame)
events: Final = tuple(
json.loads(next(line[6:] for line in frame.splitlines() if line.startswith("data: ")))
for frame in frames if "data: [DONE]" not in frame
)
assert result.status_code == 200, result.text
assert message in result.text
if path == "/v1/responses":
assert frames[-1] == "data: [DONE]", result.text
assert frames[-2].startswith("event: response.failed\n"), result.text
if partial:
assert [event["type"] for event in events] == [
"response.created", "response.output_item.added",
"response.function_call_arguments.delta", "response.failed",
]
assert events[2]["delta"] == tool_delta["delta"]
assert events[-1]["sequence_number"] == events[-2]["sequence_number"] + 1
assert events[-1]["response"]["id"] == events[0]["response"]["id"]
else:
assert [event["type"] for event in events] == ["response.failed"]
assert events[0]["sequence_number"] == 0
assert events[0]["response"]["id"].startswith("resp_")
assert events[-1]["response"]["status"] == "failed"
assert events[-1]["response"]["error"]["code"] == {
"rate_limit": "rate_limit_exceeded", "numeric_rate_limit": "rate_limit_exceeded",
"server_error": "server_error", "response_failed": "server_error", "cyber_policy": "cyber_policy",
}[error_kind]
assert events[-1]["response"]["error"]["message"] == message
else:
assert events[0]["object"] == "chat.completion.chunk", result.text
assert "response.failed" not in result.text
assert "error" in events[-1]
@pytest.mark.asyncio
async def test_responses_api_background_polling_rejects_missing_input():
from fastapi import Response as FastAPIResponse
from starlette.requests import Request
from litellm.proxy._types import ProxyException, UserAPIKeyAuth
from litellm.proxy.response_api_endpoints.endpoints import responses_api
processor = MagicMock()
async def return_exception(*, e: Exception, **kwargs: object) -> Exception:
return e
processor._handle_llm_api_exception = AsyncMock(side_effect=return_exception)
processor.common_processing_pre_call_logic = AsyncMock(return_value=({"model": "gpt-4o"}, MagicMock()))
async def receive():
return {
"type": "http.request",
"body": b'{"model":"gpt-4o","background":true}',
"more_body": False,
}
request = Request(
{
"type": "http",
"method": "POST",
"path": "/v1/responses",
"headers": [(b"content-type", b"application/json")],
},
receive,
)
with (
patch( # test-quality-ok: endpoint constructs the processor directly
"litellm.proxy.response_api_endpoints.endpoints.ProxyBaseLLMRequestProcessing",
return_value=processor,
),
patch( # test-quality-ok: polling decision is imported inside the endpoint
"litellm.proxy.response_polling.polling_handler.should_use_polling_for_request",
return_value=True,
),
patch( # test-quality-ok: background task is imported inside the endpoint
"litellm.proxy.response_polling.background_streaming.background_streaming_task",
new_callable=AsyncMock,
) as mock_background_streaming_task,
patch( # test-quality-ok: polling handler is imported inside the endpoint
"litellm.proxy.response_polling.polling_handler.ResponsePollingHandler.create_initial_state",
new_callable=AsyncMock,
) as mock_create_initial_state,
):
with pytest.raises(ProxyException) as exc_info:
await responses_api(
request=request,
fastapi_response=FastAPIResponse(),
user_api_key_dict=UserAPIKeyAuth(api_key="sk-test"),
)
assert exc_info.value.code == "400"
assert exc_info.value.param == "input"
processor.common_processing_pre_call_logic.assert_awaited_once()
mock_background_streaming_task.assert_not_called()
mock_create_initial_state.assert_not_awaited()
@pytest.mark.asyncio
async def test_responses_api_background_polling_accepts_input_from_prompt_template():
from fastapi import Response as FastAPIResponse
from starlette.requests import Request
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.response_api_endpoints.endpoints import responses_api
processor = MagicMock()
processor.common_processing_pre_call_logic = AsyncMock(
return_value=({"model": "gpt-4o", "input": "hello from prompt"}, MagicMock())
)
initial_state = MagicMock()
async def receive():
return {
"type": "http.request",
"body": b'{"model":"gpt-4o","prompt_id":"greeting","background":true}',
"more_body": False,
}
request = Request(
{
"type": "http",
"method": "POST",
"path": "/v1/responses",
"headers": [(b"content-type", b"application/json")],
},
receive,
)
with (
patch( # test-quality-ok: endpoint constructs the processor directly
"litellm.proxy.response_api_endpoints.endpoints.ProxyBaseLLMRequestProcessing",
return_value=processor,
),
patch( # test-quality-ok: polling decision is imported inside the endpoint
"litellm.proxy.response_polling.polling_handler.should_use_polling_for_request",
return_value=True,
),
patch( # test-quality-ok: background task is imported inside the endpoint
"litellm.proxy.response_polling.background_streaming.background_streaming_task",
new_callable=AsyncMock,
),
patch( # test-quality-ok: avoid scheduling a background task in this unit test
"litellm.proxy.response_api_endpoints.endpoints.asyncio.create_task",
),
patch( # test-quality-ok: polling handler is imported inside the endpoint
"litellm.proxy.response_polling.polling_handler.ResponsePollingHandler.create_initial_state",
new_callable=AsyncMock,
) as mock_create_initial_state,
):
mock_create_initial_state.return_value = initial_state
result = await responses_api(
request=request,
fastapi_response=FastAPIResponse(),
user_api_key_dict=UserAPIKeyAuth(api_key="sk-test"),
)
assert result is initial_state
processor.common_processing_pre_call_logic.assert_awaited_once()
mock_create_initial_state.assert_awaited_once()
request_data = mock_create_initial_state.await_args.kwargs["request_data"]
assert request_data["input"] == "hello from prompt"
class TestResponsesAPIEndpoints(unittest.TestCase):
@pytest.mark.asyncio
@patch("litellm.proxy.proxy_server.llm_router")
@patch("litellm.proxy.proxy_server.user_api_key_auth")
async def test_openai_v1_responses_route(self, mock_auth, mock_router):
"""
Test that /openai/v1/responses endpoint is correctly registered and accessible.
"""
mock_auth.return_value = MagicMock(
token="test_token",
user_id="test_user",
team_id=None,
)
mock_router.aresponses = AsyncMock(
return_value={
"id": "resp_abc123",
"object": "realtime.response",
"status": "completed",
"output": [
{
"type": "message",
"role": "assistant",
"content": [{"type": "text", "text": "Test response"}],
}
],
}
)
client = TestClient(app)
test_data = {"model": "gpt-4o", "input": "Tell me about AI"}
response = client.post(
"/openai/v1/responses",
json=test_data,
headers={"Authorization": "Bearer sk-1234"},
)
assert response.status_code in [200, 401, 500]
@pytest.mark.asyncio
@patch("litellm.proxy.proxy_server.llm_router")
@patch("litellm.proxy.proxy_server.user_api_key_auth")
async def test_cursor_chat_completions_route(self, mock_auth, mock_router):
"""
Test that /cursor/chat/completions endpoint:
1. Accepts Responses API input format
2. Returns chat completions format response
3. Transforms streaming responses correctly
"""
from litellm.types.llms.openai import ResponsesAPIResponse
from litellm.types.utils import ResponseOutputMessage, ResponseOutputText
mock_auth.return_value = MagicMock(
token="test_token",
user_id="test_user",
team_id=None,
)
# Mock a Responses API response
mock_responses_response = ResponsesAPIResponse(
id="resp_cursor123",
created_at=1234567890,
model="gpt-4o",
object="response",
output=[
ResponseOutputMessage(
type="message",
role="assistant",
content=[ResponseOutputText(type="output_text", text="Hello from Cursor!")],
)
],
)
mock_router.aresponses = AsyncMock(return_value=mock_responses_response)
client = TestClient(app)
# Test with Responses API input format (what Cursor sends)
test_data = {
"model": "gpt-4o",
"input": [{"role": "user", "content": "Hello"}],
}
response = client.post(
"/cursor/chat/completions",
json=test_data,
headers={"Authorization": "Bearer sk-1234"},
)
# Should return 200 (or 401/500 if auth fails)
assert response.status_code in [200, 401, 500]
# If successful, verify it returns chat completions format
if response.status_code == 200:
response_data = response.json()
# Should have chat completion structure
assert "choices" in response_data or "id" in response_data
# Should not have Responses API structure
assert "output" not in response_data or "status" not in response_data
@pytest.mark.asyncio
@patch("litellm.proxy.proxy_server.llm_router")
@patch("litellm.proxy.proxy_server.user_api_key_auth")
async def test_responses_api_key_spend_header_includes_response_cost(self, mock_auth, mock_router):
"""
Test that x-litellm-key-spend header includes the current request's response_cost
for /v1/responses endpoint.
This ensures the spend header reflects updated spend including the current request,
even though spend tracking updates happen asynchronously after the response.
"""
from litellm.types.llms.openai import ResponsesAPIResponse
from litellm.types.utils import ResponseOutputMessage, ResponseOutputText
# Create mock user API key with initial spend
mock_user_api_key_dict = MagicMock()
mock_user_api_key_dict.token = "test_token"
mock_user_api_key_dict.user_id = "test_user"
mock_user_api_key_dict.team_id = None
mock_user_api_key_dict.spend = 0.001 # Initial spend: $0.001
mock_user_api_key_dict.tpm_limit = None
mock_user_api_key_dict.rpm_limit = None
mock_user_api_key_dict.max_budget = None
mock_user_api_key_dict.allowed_model_region = None
mock_user_api_key_dict.api_key = "sk-test-key"
mock_user_api_key_dict.metadata = {}
mock_auth.return_value = mock_user_api_key_dict
# Mock response with hidden_params containing response_cost
mock_response = ResponsesAPIResponse(
id="resp_test123",
created_at=1234567890,
model="gpt-4o",
object="response",
output=[
ResponseOutputMessage(
type="message",
role="assistant",
content=[ResponseOutputText(type="output_text", text="Test response")],
)
],
)
# Add hidden_params with response_cost to the mock response
mock_response._hidden_params = {
"response_cost": 0.0005, # Current request cost: $0.0005
"model_id": "test-model-id",
}
mock_router.aresponses = AsyncMock(return_value=mock_response)
client = TestClient(app)
test_data = {"model": "gpt-4o", "input": "Tell me about AI"}
response = client.post(
"/v1/responses",
json=test_data,
headers={"Authorization": "Bearer sk-test-key"},
)
# Verify the response was successful
assert response.status_code == 200
# Verify x-litellm-key-spend header includes current request cost
assert "x-litellm-key-spend" in response.headers
key_spend_value = float(response.headers["x-litellm-key-spend"])
expected_spend = 0.001 + 0.0005 # Initial spend + current request cost
assert key_spend_value == pytest.approx(expected_spend, abs=1e-10)
# Verify x-litellm-response-cost header is present
assert "x-litellm-response-cost" in response.headers
response_cost_value = float(response.headers["x-litellm-response-cost"])
assert response_cost_value == pytest.approx(0.0005, abs=1e-10)
import json
class TestManagedResponsesWSFirstMessage:
@pytest.mark.asyncio
async def test_first_message_processed_before_loop(self):
"""
ManagedResponsesWebSocketHandler must process first_message before
entering its receive loop. Regression for clients that connect without
?model= (e.g. Codex) and send model inside the first response.create event.
"""
from litellm.responses.streaming_iterator import ManagedResponsesWebSocketHandler
first = json.dumps(
{
"type": "response.create",
"model": "gpt-4o-mini",
"store": False,
"input": [
{
"type": "message",
"role": "user",
"content": [{"type": "input_text", "text": "hi"}],
}
],
}
)
ws = MagicMock()
ws.receive_text = AsyncMock(side_effect=Exception("disconnect"))
ws.send_text = AsyncMock()
processed: list = []
async def fake_process(msg: str) -> None:
processed.append(msg)
handler = ManagedResponsesWebSocketHandler(
websocket=ws,
model="gpt-4o-mini",
logging_obj=MagicMock(),
first_message=first,
)
handler._process_response_create = fake_process # type: ignore[method-assign]
await handler.run()
assert processed == [first]
@pytest.mark.asyncio
async def test_no_first_message_falls_through_to_loop(self):
"""When first_message is None, run() goes straight to receive_text()."""
from litellm.responses.streaming_iterator import ManagedResponsesWebSocketHandler
subsequent = json.dumps({"type": "response.create", "model": "gpt-4o-mini"})
ws = MagicMock()
ws.receive_text = AsyncMock(side_effect=[subsequent, Exception("disconnect")])
ws.send_text = AsyncMock()
processed: list = []
async def fake_process(msg: str) -> None:
processed.append(msg)
handler = ManagedResponsesWebSocketHandler(
websocket=ws,
model="gpt-4o-mini",
logging_obj=MagicMock(),
first_message=None,
)
handler._process_response_create = fake_process # type: ignore[method-assign]
await handler.run()
assert processed == [subsequent]
class TestResponsesWSStreamingFirstMessage:
@pytest.mark.asyncio
async def test_client_to_backend_replays_first_message(self):
"""
ResponsesWebSocketStreaming.client_to_backend must send first_message to
the backend before entering the receive loop.
"""
from litellm.responses.streaming_iterator import ResponsesWebSocketStreaming
first = json.dumps({"type": "response.create", "model": "gpt-4o-mini", "input": []})
ws = MagicMock()
ws.receive_text = AsyncMock(side_effect=Exception("disconnect"))
backend_ws = MagicMock()
backend_ws.send = AsyncMock()
streaming = ResponsesWebSocketStreaming(
websocket=ws,
backend_ws=backend_ws,
logging_obj=MagicMock(),
first_message=first,
)
await streaming.client_to_backend()
backend_ws.send.assert_awaited_once_with(first)
class TestWSSessionCostTracking:
@pytest.mark.asyncio
async def test_router_budget_limiter_skips_aresponses_websocket_call_type(self):
"""
RouterBudgetLimiting.async_log_success_event must not raise when
call_type='_aresponses_websocket', even when standard_logging_object is None.
Per-turn costs are tracked by individual aresponses calls inside the session;
the outer session wrapper fires with result=None.
"""
from litellm.router_strategy.budget_limiter import RouterBudgetLimiting
limiter = RouterBudgetLimiting.__new__(RouterBudgetLimiting)
kwargs = {
"call_type": "_aresponses_websocket",
"standard_logging_object": None,
"litellm_params": {"custom_llm_provider": "vertex_ai"},
}
await limiter.async_log_success_event(
kwargs=kwargs,
response_obj=None,
start_time=None,
end_time=None,
)
@pytest.mark.asyncio
async def test_router_budget_limiter_skips_arealtime_call_type(self):
"""Same guard applies to _arealtime WS session wrappers."""
from litellm.router_strategy.budget_limiter import RouterBudgetLimiting
limiter = RouterBudgetLimiting.__new__(RouterBudgetLimiting)
kwargs = {
"call_type": "_arealtime",
"standard_logging_object": None,
"litellm_params": {"custom_llm_provider": "openai"},
}
await limiter.async_log_success_event(
kwargs=kwargs,
response_obj=None,
start_time=None,
end_time=None,
)
class TestWSModelExtraction:
"""Test _extract_model_from_first_ws_event for flat and nested frame formats."""
def test_flat_format_extracts_model(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_extract_model_from_first_ws_event,
)
event = {"type": "response.create", "model": "gpt-4o", "input": "hello"}
assert _extract_model_from_first_ws_event(event) == "gpt-4o"
def test_nested_format_extracts_model(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_extract_model_from_first_ws_event,
)
event = {"type": "response.create", "response": {"model": "gpt-4o", "input": "hello"}}
assert _extract_model_from_first_ws_event(event) == "gpt-4o"
def test_nested_format_takes_precedence_over_flat(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_extract_model_from_first_ws_event,
)
event = {
"type": "response.create",
"model": "flat-model",
"response": {"model": "nested-model"},
}
assert _extract_model_from_first_ws_event(event) == "nested-model"
def test_no_model_returns_none(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_extract_model_from_first_ws_event,
)
event = {"type": "response.create", "input": "hello"}
assert _extract_model_from_first_ws_event(event) is None
def test_non_object_returns_none(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_extract_model_from_first_ws_event,
)
assert _extract_model_from_first_ws_event([]) is None
class TestResponsesWSFirstFrameValidation:
@pytest.mark.asyncio
async def test_rejects_non_response_create_first_frame(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
ws = MagicMock()
ws.receive_text = AsyncMock(return_value=json.dumps({"type": "session.update", "model": "gpt-4o"}))
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result is None
ws.send_text.assert_awaited_once()
ws.close.assert_awaited_once_with(code=1008, reason="Invalid first message")
error_payload = json.loads(ws.send_text.await_args.args[0])
assert error_payload["error"]["message"] == "First message must be a response.create JSON object."
@pytest.mark.asyncio
async def test_rejects_non_object_json_first_frame(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
ws = MagicMock()
ws.receive_text = AsyncMock(return_value=json.dumps(["gpt-4o"]))
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result is None
ws.send_text.assert_awaited_once()
ws.close.assert_awaited_once_with(code=1008, reason="Invalid first message")
@pytest.mark.asyncio
async def test_client_disconnect_first_frame_does_not_close(self):
from fastapi import WebSocketDisconnect
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
ws = MagicMock()
ws.receive_text = AsyncMock(side_effect=WebSocketDisconnect(code=1006))
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result is None
ws.close.assert_not_awaited()
ws.send_text.assert_not_awaited()
@pytest.mark.asyncio
async def test_server_error_first_frame_closes_with_internal_error(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
ws = MagicMock()
ws.receive_text = AsyncMock(side_effect=RuntimeError("boom"))
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result is None
ws.close.assert_awaited_once_with(code=1011, reason="Internal server error")
class TestResponsesWSFirstFrameModelAuth:
@pytest.mark.asyncio
async def test_endpoint_enforces_auth_after_model_from_first_frame(self):
from litellm.proxy.response_api_endpoints.endpoints import (
responses_websocket_endpoint,
)
ws = MagicMock()
ws.headers = {}
ws.query_params = {}
ws.scope = {"headers": []}
ws.url = "ws://testserver/v1/responses"
ws.accept = AsyncMock()
ws.receive_text = AsyncMock(
return_value=json.dumps({"type": "response.create", "model": "gpt-4o-mini", "input": []})
)
ws.close = AsyncMock()
processor = MagicMock()
processor.common_processing_pre_call_logic = AsyncMock(return_value=({"model": "gpt-4o-mini"}, MagicMock()))
async def fake_llm_call():
return None
with (
patch(
"litellm.proxy.response_api_endpoints.endpoints._enforce_responses_ws_first_frame_model_auth",
new_callable=AsyncMock,
) as mock_model_auth,
patch(
"litellm.proxy.response_api_endpoints.endpoints.ProxyBaseLLMRequestProcessing",
return_value=processor,
),
patch(
"litellm.proxy.route_llm_request.route_request",
new_callable=AsyncMock,
return_value=fake_llm_call(),
),
):
await responses_websocket_endpoint(
websocket=ws,
model=None,
user_api_key_dict=MagicMock(),
)
mock_model_auth.assert_awaited_once()
@pytest.mark.asyncio
@pytest.mark.parametrize("nested", [False, True])
@pytest.mark.parametrize("query_model", [None, "gpt-4o-mini"])
async def test_endpoint_routes_on_first_frame_input_and_previous_response_id(
self, nested: bool, query_model: str | None
):
from litellm.proxy.response_api_endpoints.endpoints import (
responses_websocket_endpoint,
)
replayed_input = [{"type": "reasoning", "id": "encitem_abc", "encrypted_content": "litellm_enc:abc;blob"}]
payload = {"model": "gpt-4o-mini", "input": replayed_input, "previous_response_id": "resp_prev"}
first_frame = {"type": "response.create", "response": payload} if nested else {"type": "response.create", **payload}
raw_first_frame = json.dumps(first_frame)
ws = MagicMock()
ws.headers = {}
ws.query_params = {}
ws.scope = {"headers": []}
ws.url = "ws://testserver/v1/responses"
ws.accept = AsyncMock()
ws.receive_text = AsyncMock(return_value=raw_first_frame)
ws.close = AsyncMock()
processor = MagicMock()
processor.common_processing_pre_call_logic = AsyncMock(
return_value=({"model": "gpt-4o-mini", "litellm_metadata": {}}, MagicMock())
)
async def fake_llm_call():
return None
with (
patch( # test-quality-ok: first-frame model auth needs a live router and key table and has its own tests below
"litellm.proxy.response_api_endpoints.endpoints._enforce_responses_ws_first_frame_model_auth",
new_callable=AsyncMock,
),
patch( # test-quality-ok: the pre-call processor needs a live proxy; the payload it hands to routing is what is under test
"litellm.proxy.response_api_endpoints.endpoints.ProxyBaseLLMRequestProcessing",
return_value=processor,
),
patch( # test-quality-ok: routing is the seam where the first frame's input and previous_response_id become observable
"litellm.proxy.route_llm_request.route_request",
new_callable=AsyncMock,
return_value=fake_llm_call(),
) as mock_route_request,
):
await responses_websocket_endpoint(
websocket=ws,
model=query_model,
user_api_key_dict=MagicMock(),
)
ws.receive_text.assert_awaited_once()
routed = mock_route_request.await_args.kwargs["data"]
assert routed["model"] == "gpt-4o-mini"
assert routed["input"] == replayed_input
assert routed["previous_response_id"] == "resp_prev"
assert processor.common_processing_pre_call_logic.await_args.kwargs["model"] == "gpt-4o-mini"
assert mock_route_request.await_args.kwargs["route_type"] == "_aresponses_websocket"
ws.close.assert_not_awaited()
@pytest.mark.asyncio
@pytest.mark.parametrize("provider_rejected", [True, False])
async def test_endpoint_books_a_provider_rejected_connection_as_a_failed_request(self, provider_rejected: bool):
from litellm.proxy.response_api_endpoints.endpoints import (
responses_websocket_endpoint,
)
ws = MagicMock()
ws.headers = {}
ws.query_params = {}
ws.scope = {"headers": []}
ws.url = "ws://testserver/v1/responses"
ws.accept = AsyncMock()
ws.receive_text = AsyncMock(
return_value=json.dumps({"type": "response.create", "model": "gpt-4o-mini", "input": []})
)
ws.close = AsyncMock()
processor = MagicMock()
processor.common_processing_pre_call_logic = AsyncMock(
return_value=({"model": "gpt-4o-mini", "litellm_metadata": {}}, MagicMock())
)
failure = litellm.BadRequestError(
message="invalid_encrypted_content", model="gpt-4o-mini", llm_provider="openai"
)
async def fake_llm_call():
return failure if provider_rejected else None
proxy_logging_obj = MagicMock()
proxy_logging_obj.post_call_failure_hook = AsyncMock(return_value=None)
user_api_key_dict = MagicMock()
with (
patch( # test-quality-ok: first-frame model auth needs a live router and key table and has its own tests above
"litellm.proxy.response_api_endpoints.endpoints._enforce_responses_ws_first_frame_model_auth",
new_callable=AsyncMock,
),
patch( # test-quality-ok: the pre-call processor needs a live proxy; what the endpoint does with the relay's outcome is under test
"litellm.proxy.response_api_endpoints.endpoints.ProxyBaseLLMRequestProcessing",
return_value=processor,
),
patch( # test-quality-ok: routing is the seam that hands back the relay's outcome
"litellm.proxy.route_llm_request.route_request",
new_callable=AsyncMock,
return_value=fake_llm_call(),
),
patch( # test-quality-ok: the failure hook is the proxy's only path to a failed spend log row
"litellm.proxy.proxy_server.proxy_logging_obj",
proxy_logging_obj,
),
):
await responses_websocket_endpoint(
websocket=ws,
model=None,
user_api_key_dict=user_api_key_dict,
)
ws.close.assert_not_awaited()
if not provider_rejected:
proxy_logging_obj.post_call_failure_hook.assert_not_awaited()
return
proxy_logging_obj.post_call_failure_hook.assert_awaited_once()
booked = proxy_logging_obj.post_call_failure_hook.await_args.kwargs
assert booked["original_exception"] is failure
assert booked["user_api_key_dict"] is user_api_key_dict
assert booked["request_data"]["model"] == "gpt-4o-mini"
@pytest.mark.asyncio
async def test_endpoint_sends_an_error_frame_when_routing_rejects_the_connection(self):
from litellm.proxy.response_api_endpoints.endpoints import (
responses_websocket_endpoint,
)
ws = MagicMock()
ws.headers = {}
ws.query_params = {}
ws.scope = {"headers": []}
ws.url = "ws://testserver/v1/responses"
ws.accept = AsyncMock()
ws.receive_text = AsyncMock(
return_value=json.dumps({"type": "response.create", "model": "gpt-4o-mini", "input": []})
)
ws.send_text = AsyncMock()
ws.close = AsyncMock()
processor = MagicMock()
processor.common_processing_pre_call_logic = AsyncMock(
return_value=({"model": "gpt-4o-mini", "litellm_metadata": {}}, MagicMock())
)
rejection = litellm.RateLimitError(
message="origin deployment is cooling down", model="gpt-4o-mini", llm_provider="openai"
)
proxy_logging_obj = MagicMock()
proxy_logging_obj.post_call_failure_hook = AsyncMock(return_value=None)
user_api_key_dict = MagicMock()
with (
patch( # test-quality-ok: first-frame model auth needs a live router and key table and has its own tests above
"litellm.proxy.response_api_endpoints.endpoints._enforce_responses_ws_first_frame_model_auth",
new_callable=AsyncMock,
),
patch( # test-quality-ok: the pre-call processor needs a live proxy; what the endpoint tells the client is under test
"litellm.proxy.response_api_endpoints.endpoints.ProxyBaseLLMRequestProcessing",
return_value=processor,
),
patch( # test-quality-ok: routing is the seam that raises the affinity rejection
"litellm.proxy.route_llm_request.route_request",
new_callable=AsyncMock,
side_effect=rejection,
),
patch( # test-quality-ok: the failure hook is the proxy's only path to a failed spend log row
"litellm.proxy.proxy_server.proxy_logging_obj",
proxy_logging_obj,
),
):
await responses_websocket_endpoint(
websocket=ws,
model=None,
user_api_key_dict=user_api_key_dict,
)
frame = json.loads(ws.send_text.await_args.args[0])
assert frame["type"] == "error"
assert frame["status"] == 429
assert frame["error"]["type"] == "rate_limit_exceeded"
assert "cooling down" in frame["error"]["message"]
ws.close.assert_awaited_once_with(code=1011, reason="Internal server error")
booked = proxy_logging_obj.post_call_failure_hook.await_args.kwargs
assert booked["original_exception"] is rejection
assert booked["user_api_key_dict"] is user_api_key_dict
assert booked["request_data"]["model"] == "gpt-4o-mini"
@pytest.mark.asyncio
async def test_reruns_model_auth_for_first_frame_model(self):
from starlette.requests import Request
from litellm.proxy.response_api_endpoints.endpoints import (
_enforce_responses_ws_first_frame_model_auth,
)
request = Request({"type": "http", "method": "POST", "path": "/v1/responses", "headers": []})
user_api_key_dict = MagicMock()
llm_router = MagicMock()
with (
patch(
"litellm.proxy.auth.user_api_key_auth._enforce_key_and_fallback_model_access",
new_callable=AsyncMock,
) as mock_key_check,
patch(
"litellm.proxy.auth.user_api_key_auth._run_centralized_common_checks",
new_callable=AsyncMock,
) as mock_common_checks,
patch(
"litellm.proxy.proxy_server.llm_model_list",
[],
),
patch("litellm.proxy.proxy_server.master_key", "sk-test"),
patch("litellm.proxy.proxy_server.user_custom_auth", None),
patch("litellm.proxy.proxy_server.general_settings", {}),
):
await _enforce_responses_ws_first_frame_model_auth(
request=request,
model="gpt-4o-mini",
user_api_key_dict=user_api_key_dict,
llm_router=llm_router,
)
mock_key_check.assert_awaited_once_with(
valid_token=user_api_key_dict,
request_data={"model": "gpt-4o-mini"},
route="/v1/responses",
request=request,
llm_model_list=[],
llm_router=llm_router,
)
mock_common_checks.assert_awaited_once_with(
user_api_key_auth_obj=user_api_key_dict,
request=request,
request_data={"model": "gpt-4o-mini"},
route="/v1/responses",
)
class TestReadWSModelFromFirstFrameErrors:
@pytest.mark.asyncio
async def test_timeout_closes_without_error_frame(self):
import asyncio
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
ws = MagicMock()
ws.receive_text = AsyncMock(side_effect=asyncio.TimeoutError())
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result is None
ws.send_text.assert_not_awaited()
ws.close.assert_awaited_once_with(code=1008, reason="Timed out waiting for first message")
@pytest.mark.asyncio
async def test_invalid_json_sends_error_and_closes(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
ws = MagicMock()
ws.receive_text = AsyncMock(return_value="this is not json")
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result is None
payload = json.loads(ws.send_text.await_args.args[0])
assert payload["error"]["message"] == "First message is not valid JSON."
ws.close.assert_awaited_once_with(code=1008, reason="Invalid JSON in first message")
@pytest.mark.asyncio
async def test_missing_model_sends_error_and_closes(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
ws = MagicMock()
ws.receive_text = AsyncMock(return_value=json.dumps({"type": "response.create", "input": []}))
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result is None
payload = json.loads(ws.send_text.await_args.args[0])
assert "No model provided" in payload["error"]["message"]
ws.close.assert_awaited_once_with(code=1008, reason="No model provided")
@pytest.mark.asyncio
async def test_valid_first_frame_returns_model_and_raw(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
raw = json.dumps({"type": "response.create", "model": "gpt-4o", "input": []})
ws = MagicMock()
ws.receive_text = AsyncMock(return_value=raw)
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws)
assert result == ("gpt-4o", raw)
ws.send_text.assert_not_awaited()
ws.close.assert_not_awaited()
@pytest.mark.asyncio
async def test_query_model_wins_over_first_frame_model(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
raw = json.dumps({"type": "response.create", "model": "gpt-4o", "input": []})
ws = MagicMock()
ws.receive_text = AsyncMock(return_value=raw)
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws, query_model="reasoning-group")
assert result == ("reasoning-group", raw)
ws.close.assert_not_awaited()
@pytest.mark.asyncio
async def test_query_model_satisfies_a_first_frame_without_model(self):
from litellm.proxy.response_api_endpoints.endpoints import (
_read_ws_model_from_first_frame,
)
raw = json.dumps({"type": "response.create", "input": []})
ws = MagicMock()
ws.receive_text = AsyncMock(return_value=raw)
ws.send_text = AsyncMock()
ws.close = AsyncMock()
result = await _read_ws_model_from_first_frame(ws, query_model="reasoning-group")
assert result == ("reasoning-group", raw)
ws.send_text.assert_not_awaited()
ws.close.assert_not_awaited()
class TestManagedResponsesSameProvider:
def _handler(self, model, custom_llm_provider=None):
from litellm.responses.streaming_iterator import (
ManagedResponsesWebSocketHandler,
)
return ManagedResponsesWebSocketHandler(
websocket=MagicMock(),
model=model,
logging_obj=MagicMock(),
custom_llm_provider=custom_llm_provider,
)
def test_none_model_treated_as_same_provider(self):
assert self._handler("openai/gpt-4o")._same_provider(None) is True
def test_identical_model_is_same_provider(self):
assert self._handler("openai/gpt-4o")._same_provider("openai/gpt-4o") is True
def test_same_provider_different_model(self):
assert self._handler("gpt-4o")._same_provider("gpt-4o-mini") is True
def test_different_provider_is_not_same(self):
assert self._handler("gpt-4o")._same_provider("vertex_ai/gemini-2.0-flash") is False
def test_inject_credentials_keeps_provider_for_same_provider_model(self):
handler = self._handler("gpt-4o", custom_llm_provider="openai")
call_kwargs: dict = {}
handler._inject_credentials(call_kwargs, model="gpt-4o-mini")
assert call_kwargs["custom_llm_provider"] == "openai"
def test_inject_credentials_drops_provider_for_cross_provider_model(self):
handler = self._handler("gpt-4o", custom_llm_provider="openai")
call_kwargs: dict = {}
handler._inject_credentials(call_kwargs, model="vertex_ai/gemini-2.0-flash")
assert "custom_llm_provider" not in call_kwargs
def test_unresolvable_connection_model_falls_back_to_custom_provider(self):
handler = self._handler("my-custom-deployment", custom_llm_provider="openai")
assert handler._same_provider("gpt-4o-mini") is True
call_kwargs: dict = {}
handler._inject_credentials(call_kwargs, model="gpt-4o-mini")
assert call_kwargs["custom_llm_provider"] == "openai"
def test_unresolvable_connection_model_still_drops_cross_provider(self):
handler = self._handler("my-custom-deployment", custom_llm_provider="openai")
call_kwargs: dict = {}
handler._inject_credentials(call_kwargs, model="vertex_ai/gemini-2.0-flash")
assert "custom_llm_provider" not in call_kwargs
def _auth_override():
from litellm.proxy._types import UserAPIKeyAuth
return UserAPIKeyAuth(api_key="sk-test-cursor", user_id="cursor-user")
def test_cursor_chat_completions_messages_body_uses_chat_pipeline():
"""A genuine chat-completions body (``messages`` present; what Cursor sends for
models whose BYOK it already fixed) must run through the standard chat pipeline
untouched: multi-turn tool history (assistant tool_calls + role="tool" results)
and nested chat-format tool defs are valid there, while blindly renaming
``messages`` to ``input`` (the pre-fix behavior) produced items the Responses API
rejects. Asserts acompletion is called with the exact messages and aresponses is
never touched."""
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
import litellm.proxy.proxy_server as ps
messages = [
{"role": "user", "content": "read a file"},
{
"role": "assistant",
"content": None,
"tool_calls": [
{
"id": "call_hist1",
"type": "function",
"function": {"name": "read_file", "arguments": '{"path": "a.py"}'},
}
],
},
{"role": "tool", "tool_call_id": "call_hist1", "content": "file contents"},
{"role": "user", "content": "now summarize"},
]
mock_router = MagicMock()
mock_router.acompletion = AsyncMock(
return_value=litellm.ModelResponse(
id="chatcmpl-cursor-1",
choices=[
{
"index": 0,
"message": {"role": "assistant", "content": "summary"},
"finish_reason": "stop",
}
],
model="gpt-4o",
)
)
mock_router.aresponses = AsyncMock()
mock_router.get_available_deployment = MagicMock(return_value=None)
app.dependency_overrides[user_api_key_auth] = _auth_override
try:
with patch.object(ps, "llm_router", mock_router):
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={
"model": "gpt-4o",
"messages": messages,
"tools": [
{
"type": "function",
"function": {"name": "read_file", "parameters": {"type": "object"}},
}
],
},
headers={"Authorization": "Bearer sk-test-cursor"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200, response.text
body = response.json()
assert body["choices"][0]["message"]["content"] == "summary"
assert "output" not in body
mock_router.acompletion.assert_called_once()
called_kwargs = mock_router.acompletion.call_args.kwargs
assert called_kwargs["messages"] == messages
assert "input" not in called_kwargs
mock_router.aresponses.assert_not_called()
def test_cursor_chat_completions_input_body_uses_responses_pipeline_and_strips_stream_options():
"""A Responses-shaped body (``input``, no ``messages``; what Cursor agent mode
sends) must run through the Responses pipeline with chat-completions output, and
``stream_options`` (chat-completions-only; Cursor sends include_usage) must be
stripped before the Responses call since OpenAI's Responses API rejects it.
Stripping must not mutate the dict _read_request_body returned: that can be the
request-scope cached parsed body itself, and removing a key from it corrupts the
cache's key snapshot so any later _read_request_body caller (spend tracking,
logging hooks) silently gets an empty body; a follow-up read must still see the
full original body."""
import asyncio
from openai.types.responses import ResponseOutputMessage, ResponseOutputText
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from litellm.proxy.common_utils.http_parsing_utils import (
_read_request_body as real_read_request_body,
)
from litellm.types.llms.openai import ResponsesAPIResponse
import litellm.proxy.proxy_server as ps
captured_requests = []
async def capturing_read_request_body(request):
captured_requests.append(request)
return await real_read_request_body(request=request)
mock_router = MagicMock()
mock_router.aresponses = AsyncMock(
return_value=ResponsesAPIResponse(
id="resp_cursor_agent1",
created_at=1234567890,
model="gpt-4o",
object="response",
output=[
ResponseOutputMessage(
id="msg_agent1",
type="message",
role="assistant",
status="completed",
content=[ResponseOutputText(type="output_text", text="agent reply", annotations=[])],
)
],
)
)
mock_router.acompletion = AsyncMock()
app.dependency_overrides[user_api_key_auth] = _auth_override
try:
with (
patch.object(ps, "llm_router", mock_router),
patch(
"litellm.proxy.response_api_endpoints.endpoints._read_request_body",
side_effect=capturing_read_request_body,
),
):
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={
"model": "gpt-4o",
"input": [{"role": "user", "content": "hello"}],
"stream_options": {"include_usage": True},
},
headers={"Authorization": "Bearer sk-test-cursor"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200, response.text
body = response.json()
assert body["choices"][0]["message"]["content"] == "agent reply"
assert "output" not in body
mock_router.aresponses.assert_called_once()
called_kwargs = mock_router.aresponses.call_args.kwargs
assert "stream_options" not in called_kwargs
mock_router.acompletion.assert_not_called()
assert captured_requests
followup_body = asyncio.run(real_read_request_body(request=captured_requests[0]))
assert followup_body.get("stream_options") == {"include_usage": True}
assert followup_body.get("input") == [{"role": "user", "content": "hello"}]
def test_cursor_models_route_delegates_to_model_list():
"""Clients pointed at <proxy>/cursor as an OpenAI-compatible base URL resolve and
verify keys via GET {base}/models (the OpenAI SDK contract). Without a dedicated
route those requests fall through to the Cursor Cloud Agents passthrough and 401
for lack of a Cursor API key, so BYOK verification fails before any chat request
is sent. Both /cursor/models and /cursor/v1/models must serve the standard model
list instead."""
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
import litellm.proxy.proxy_server as ps
model_payload = {"data": [{"id": "gpt-5.6", "object": "model"}], "object": "list"}
app.dependency_overrides[user_api_key_auth] = _auth_override
try:
with patch.object(ps, "model_list", AsyncMock(return_value=model_payload)) as mock_model_list:
client = TestClient(app)
for path in ("/cursor/models", "/cursor/v1/models"):
response = client.get(path, headers={"Authorization": "Bearer sk-test-cursor"})
assert response.status_code == 200, f"{path}: {response.text}"
assert response.json() == model_payload
assert mock_model_list.call_count == 2
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
class TestNestFlatChatTools:
def test_flat_custom_tool_is_nested(self):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
result = _convert_tool_envelope(
{"type": "custom", "name": "ApplyPatch", "description": "V4A patch", "format": {"type": "text"}},
to_chat=True,
)
assert result == {
"type": "custom",
"custom": {"name": "ApplyPatch", "description": "V4A patch", "format": {"type": "text"}},
}
def test_flat_function_tool_is_nested(self):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
result = _convert_tool_envelope(
{"type": "function", "name": "read_file", "description": "d", "parameters": {"type": "object"}},
to_chat=True,
)
assert result == {
"type": "function",
"function": {"name": "read_file", "description": "d", "parameters": {"type": "object"}},
}
def test_already_nested_and_unrecognized_tools_pass_through_unchanged(self):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
tools = [
{"type": "custom", "custom": {"name": "already_nested"}},
{"type": "function", "function": {"name": "f", "parameters": {}}},
{"type": "web_search"},
{"type": "custom"},
{"name": "typeless"},
{},
"junk",
None,
42,
]
assert [_convert_tool_envelope(tool, to_chat=True) for tool in tools] == tools
class TestCursorMessagesArmToolNormalization:
@pytest.mark.asyncio
async def test_flat_custom_tool_nested_before_chat_completion_delegation(self):
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from litellm.proxy._types import UserAPIKeyAuth
seen = {}
async def fake_chat_completion(request, fastapi_response, model, user_api_key_dict):
from litellm.proxy.common_utils.http_parsing_utils import _read_request_body
seen["body"] = await _read_request_body(request=request)
return {"id": "chatcmpl-fake", "object": "chat.completion", "choices": []}
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(api_key="sk-1234")
try:
with patch("litellm.proxy.proxy_server.chat_completion", new=fake_chat_completion):
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={
"model": "gpt-5.6",
"messages": [{"role": "user", "content": "use ApplyPatch"}],
"tools": [
{
"type": "function",
"function": {"name": "read_file", "parameters": {"type": "object"}},
},
{
"type": "custom",
"name": "ApplyPatch",
"description": "V4A patch",
"format": {
"type": "grammar",
"definition": "start: patch",
"syntax": "lark",
},
},
],
"tool_choice": {"type": "custom", "name": "ApplyPatch"},
},
headers={"Authorization": "Bearer sk-1234"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200
assert seen["body"]["tools"] == [
{"type": "function", "function": {"name": "read_file", "parameters": {"type": "object"}}},
{
"type": "custom",
"custom": {
"name": "ApplyPatch",
"description": "V4A patch",
"format": {
"type": "grammar",
"grammar": {"definition": "start: patch", "syntax": "lark"},
},
},
},
]
assert seen["body"]["tool_choice"] == {"type": "custom", "custom": {"name": "ApplyPatch"}}
assert seen["body"]["messages"] == [{"role": "user", "content": "use ApplyPatch"}]
@pytest.mark.asyncio
async def test_messages_body_without_flat_tools_leaves_parsed_body_cache_untouched(self):
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from litellm.proxy._types import UserAPIKeyAuth
seen = {}
async def fake_chat_completion(request, fastapi_response, model, user_api_key_dict):
from litellm.proxy.common_utils.http_parsing_utils import _read_request_body
seen["body"] = await _read_request_body(request=request)
return {"id": "chatcmpl-fake", "object": "chat.completion", "choices": []}
body = {
"model": "gpt-5.6",
"messages": [{"role": "user", "content": "hi"}],
"tools": [{"type": "function", "function": {"name": "f", "parameters": {}}}],
}
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(api_key="sk-1234")
try:
with patch("litellm.proxy.proxy_server.chat_completion", new=fake_chat_completion):
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json=body,
headers={"Authorization": "Bearer sk-1234"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200
assert seen["body"]["tools"] == body["tools"]
assert seen["body"]["messages"] == body["messages"]
class TestToolEnvelopeConversionMatrix:
"""
Cursor mixes Responses API shapes into chat bodies PER LEVEL, independently
(live-captured: a pre-nested custom envelope carrying a flat grammar format).
Tool definitions and tool_choice share one envelope rule, so every cell of
direction x envelope x format must land on that direction's canonical shape.
"""
FLAT_GRAMMAR = {"type": "grammar", "definition": "start: patch", "syntax": "lark"}
NESTED_GRAMMAR = {"type": "grammar", "grammar": {"definition": "start: patch", "syntax": "lark"}}
TEXT = {"type": "text"}
@pytest.mark.parametrize("to_chat", [True, False])
@pytest.mark.parametrize("envelope", ["flat", "nested"])
@pytest.mark.parametrize("format_shape", ["absent", "text", "flat_grammar", "nested_grammar"])
def test_every_direction_envelope_and_format_lands_canonical(self, to_chat, envelope, format_shape):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
format_value = {
"absent": None,
"text": self.TEXT,
"flat_grammar": self.FLAT_GRAMMAR,
"nested_grammar": self.NESTED_GRAMMAR,
}[format_shape]
payload = {"name": "ApplyPatch", "description": "V4A patch"}
if format_value is not None:
payload["format"] = format_value
tool = {"type": "custom", "custom": payload} if envelope == "nested" else {"type": "custom", **payload}
canonical_payload = {"name": "ApplyPatch", "description": "V4A patch"}
if format_shape in ("flat_grammar", "nested_grammar"):
canonical_payload["format"] = self.NESTED_GRAMMAR if to_chat else self.FLAT_GRAMMAR
elif format_shape == "text":
canonical_payload["format"] = self.TEXT
expected = (
{"type": "custom", "custom": canonical_payload} if to_chat else {"type": "custom", **canonical_payload}
)
assert _convert_tool_envelope(tool, to_chat=to_chat) == expected
def test_nested_envelope_with_flat_grammar_matches_live_cursor_capture(self):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
cursor_tool = {"type": "custom", "custom": {"name": "ApplyPatch", "format": self.FLAT_GRAMMAR}}
assert _convert_tool_envelope(cursor_tool, to_chat=True) == {
"type": "custom",
"custom": {"name": "ApplyPatch", "format": self.NESTED_GRAMMAR},
}
@pytest.mark.parametrize("to_chat", [True, False])
def test_conversion_is_idempotent(self, to_chat):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
once = _convert_tool_envelope({"type": "custom", "name": "A", "format": self.FLAT_GRAMMAR}, to_chat=to_chat)
assert _convert_tool_envelope(once, to_chat=to_chat) == once
def test_nested_function_tool_flattens_and_flat_passes_through(self):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
nested = {"type": "function", "function": {"name": "read_file", "parameters": {"type": "object"}}}
flat = {"type": "function", "name": "read_file", "parameters": {"type": "object"}}
assert _convert_tool_envelope(nested, to_chat=False) == flat
assert _convert_tool_envelope(flat, to_chat=False) == flat
@pytest.mark.parametrize("to_chat", [True, False])
def test_unrecognized_entries_pass_through(self, to_chat):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
entries = [{"type": "web_search"}, {"type": "custom"}, "junk", None, {}, 42, {"type": "auto"}]
assert [_convert_tool_envelope(entry, to_chat=to_chat) for entry in entries] == entries
@pytest.mark.parametrize("to_chat", [True, False])
def test_empty_nested_envelope_falls_back_to_top_level_payload(self, to_chat):
"""An empty nested envelope must not shadow payload fields that sit at the top
level; treating the empty dict as the sole payload source dropped the name."""
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
hybrid = {"type": "custom", "custom": {}, "name": "ApplyPatch", "format": self.TEXT}
expected_payload = {"name": "ApplyPatch", "format": self.TEXT}
expected = {"type": "custom", "custom": expected_payload} if to_chat else {"type": "custom", **expected_payload}
assert _convert_tool_envelope(hybrid, to_chat=to_chat) == expected
def test_nested_payload_wins_over_stray_top_level_fields(self):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
tool = {"type": "custom", "custom": {"name": "NestedName"}, "name": "TopName"}
assert _convert_tool_envelope(tool, to_chat=False) == {"type": "custom", "name": "NestedName"}
@pytest.mark.parametrize("to_chat", [True, False])
def test_nameless_envelope_passes_through_unchanged(self, to_chat):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
nameless = {"type": "custom", "custom": {}, "description": "no name anywhere"}
assert _convert_tool_envelope(nameless, to_chat=to_chat) == nameless
class TestToolChoiceSharesTheToolEnvelopeRule:
"""
tool_choice carries the same {"type": T, T: {...}} chat envelope as a tool
definition, so it converts through the same function in both directions.
OpenAI requires the nested key on chat (SDK ChatCompletionNamedToolChoiceParam
and ChatCompletionNamedToolChoiceCustomParam both mark it Required).
"""
@pytest.mark.parametrize("choice_type", ["custom", "function"])
def test_flat_tool_choice_is_nested_for_chat(self, choice_type):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
assert _convert_tool_envelope({"type": choice_type, "name": "ApplyPatch"}, to_chat=True) == {
"type": choice_type,
choice_type: {"name": "ApplyPatch"},
}
@pytest.mark.parametrize("choice_type", ["custom", "function"])
def test_nested_tool_choice_is_flattened_for_responses(self, choice_type):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
assert _convert_tool_envelope({"type": choice_type, choice_type: {"name": "ApplyPatch"}}, to_chat=False) == {
"type": choice_type,
"name": "ApplyPatch",
}
@pytest.mark.parametrize("to_chat", [True, False])
def test_sentinel_and_malformed_tool_choice_pass_through(self, to_chat):
from litellm.proxy.response_api_endpoints.endpoints import _convert_tool_envelope
for unchanged in ("auto", "required", "none", None, {"type": "auto"}, 42):
assert _convert_tool_envelope(unchanged, to_chat=to_chat) == unchanged
class TestNormalizeToolDialectCoversBothFields:
"""
The regression that motivated one normalizer: tools were converted while
tool_choice was left flat, so OpenAI rejected the request. Both fields move
together in a single call, on both arms.
"""
@pytest.mark.parametrize("to_chat", [True, False])
def test_tools_and_tool_choice_convert_together(self, to_chat):
from litellm.proxy.response_api_endpoints.endpoints import _normalize_tool_dialect
flat = {"type": "custom", "name": "ApplyPatch"}
nested = {"type": "custom", "custom": {"name": "ApplyPatch"}}
source = flat if to_chat else nested
expected = nested if to_chat else flat
out = _normalize_tool_dialect({"messages": [], "tools": [source], "tool_choice": source}, to_chat=to_chat)
assert out["tools"] == [expected]
assert out["tool_choice"] == expected
def test_body_needing_no_conversion_is_returned_by_identity(self):
from litellm.proxy.response_api_endpoints.endpoints import _normalize_tool_dialect
data = {"messages": [], "tools": [{"type": "function", "function": {"name": "f"}}], "tool_choice": "auto"}
assert _normalize_tool_dialect(data, to_chat=True) is data
def test_absent_tool_fields_are_not_invented(self):
from litellm.proxy.response_api_endpoints.endpoints import _normalize_tool_dialect
data = {"messages": [{"role": "user", "content": "hi"}]}
result = _normalize_tool_dialect(data, to_chat=True)
assert result == data
assert "tools" not in result and "tool_choice" not in result
class TestCursorInputArmFlattening:
@pytest.mark.asyncio
async def test_nested_chat_shapes_in_input_body_reach_aresponses_flattened(self):
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from openai.types.responses import ResponseOutputMessage, ResponseOutputText
from litellm.types.llms.openai import ResponsesAPIResponse
mock_response = ResponsesAPIResponse(
id="resp_flat123",
created_at=1234567890,
model="gpt-5.6",
object="response",
output=[
ResponseOutputMessage(
id="msg_flat123",
type="message",
role="assistant",
status="completed",
content=[ResponseOutputText(type="output_text", text="ok", annotations=[])],
)
],
)
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(api_key="sk-1234")
try:
with patch("litellm.proxy.proxy_server.llm_router") as mock_router:
mock_router.aresponses = AsyncMock(return_value=mock_response)
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={
"model": "gpt-5.6",
"input": [{"role": "user", "content": "use ApplyPatch"}],
"tools": [
{
"type": "custom",
"custom": {
"name": "ApplyPatch",
"format": {
"type": "grammar",
"grammar": {"definition": "start: patch", "syntax": "lark"},
},
},
},
{"type": "function", "name": "read_file", "parameters": {"type": "object"}},
],
"tool_choice": {"type": "custom", "custom": {"name": "ApplyPatch"}},
},
headers={"Authorization": "Bearer sk-1234"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200
call_kwargs = mock_router.aresponses.call_args.kwargs
assert call_kwargs["tools"] == [
{
"type": "custom",
"name": "ApplyPatch",
"format": {"type": "grammar", "definition": "start: patch", "syntax": "lark"},
},
{"type": "function", "name": "read_file", "parameters": {"type": "object"}},
]
assert call_kwargs["tool_choice"] == {"type": "custom", "name": "ApplyPatch"}
class TestChatCompletionsBodyDetection:
def test_routing_matrix(self):
from litellm.proxy.response_api_endpoints.endpoints import _is_chat_completions_body
assert _is_chat_completions_body({"messages": [{"role": "user", "content": "hi"}]}) is True
assert _is_chat_completions_body({"messages": [{"role": "user", "content": "hi"}], "input": []}) is True
assert _is_chat_completions_body({"messages": None, "input": [{"role": "user", "content": "hi"}]}) is False
assert _is_chat_completions_body({"messages": [], "input": [{"role": "user", "content": "hi"}]}) is False
assert _is_chat_completions_body({"messages": None}) is True
assert _is_chat_completions_body({"messages": []}) is True
assert _is_chat_completions_body({"input": [{"role": "user", "content": "hi"}]}) is False
assert _is_chat_completions_body({}) is False
@pytest.mark.asyncio
async def test_null_messages_stub_with_input_reaches_responses_arm(self):
from openai.types.responses import ResponseOutputMessage, ResponseOutputText
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from litellm.types.llms.openai import ResponsesAPIResponse
mock_response = ResponsesAPIResponse(
id="resp_stub1",
created_at=1234567890,
model="gpt-5.6",
object="response",
output=[
ResponseOutputMessage(
id="msg_stub1",
type="message",
role="assistant",
status="completed",
content=[ResponseOutputText(type="output_text", text="ok", annotations=[])],
)
],
)
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(api_key="sk-1234")
try:
with patch("litellm.proxy.proxy_server.llm_router") as mock_router:
mock_router.aresponses = AsyncMock(return_value=mock_response)
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={
"model": "gpt-5.6",
"messages": None,
"input": [{"role": "user", "content": "hello"}],
},
headers={"Authorization": "Bearer sk-1234"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200
assert mock_router.aresponses.call_args is not None
assert mock_router.aresponses.call_args.kwargs["input"] == [{"role": "user", "content": "hello"}]
class TestParseCursorModelVariant:
@pytest.mark.parametrize(
"model,expected_base,expected_effort",
[
("claude-opus-5-thinking-high", "claude-opus-5", "high"),
("claude-opus-5-thinking-xhigh-fast", "claude-opus-5", "xhigh"),
("gemini-3.0-pro-thinking-low", "gemini-3.0-pro", "low"),
("claude-opus-5-fast", "claude-opus-5", None),
("gpt-5.6-sol", "gpt-5.6-sol", None),
("foo-thinking-ultra-fast", "foo-thinking-ultra", None),
("gpt-5.6-thinking-max", "gpt-5.6", "max"),
("foo-thinking-mega-fast", "foo-thinking-mega", None),
("-thinking-high", "-thinking-high", None),
],
)
def test_parse_matrix(self, model, expected_base, expected_effort):
from litellm.proxy.response_api_endpoints.endpoints import _parse_cursor_model_variant
variant = _parse_cursor_model_variant(model)
assert variant.base_model == expected_base
assert variant.reasoning_effort == expected_effort
class TestResolveCursorModelVariant:
@pytest.fixture(scope="class")
def wildcard_router(self):
from litellm import Router
return Router(
model_list=[
{"model_name": "anthropic/*", "litellm_params": {"model": "anthropic/*", "api_key": "fake"}},
{"model_name": "openai/*", "litellm_params": {"model": "openai/*", "api_key": "fake"}},
{
"model_name": "explicit-alias-thinking-high",
"litellm_params": {"model": "anthropic/claude-opus-5", "api_key": "fake"},
},
]
)
def test_chat_body_suffix_stripped_into_reasoning_effort(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {
"model": "claude-opus-5-thinking-xhigh-fast",
"messages": [{"role": "user", "content": "hi"}],
}
resolved = _resolve_cursor_model_variant(body, wildcard_router)
assert resolved["model"] == "claude-opus-5"
assert resolved["reasoning_effort"] == "xhigh"
assert resolved["messages"] == body["messages"]
assert body["model"] == "claude-opus-5-thinking-xhigh-fast"
def test_responses_body_suffix_stripped_into_reasoning_dict(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {"model": "claude-opus-5-thinking-high", "input": [{"role": "user", "content": "hi"}]}
resolved = _resolve_cursor_model_variant(body, wildcard_router)
assert resolved["model"] == "claude-opus-5"
assert resolved["reasoning"] == {"effort": "high"}
def test_responses_body_merges_effort_into_existing_reasoning(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {
"model": "claude-opus-5-thinking-high",
"input": [{"role": "user", "content": "hi"}],
"reasoning": {"summary": "auto"},
}
resolved = _resolve_cursor_model_variant(body, wildcard_router)
assert resolved["model"] == "claude-opus-5"
assert resolved["reasoning"] == {"summary": "auto", "effort": "high"}
def test_existing_reasoning_effort_wins_but_model_still_rewritten(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
chat_body = {
"model": "claude-opus-5-thinking-high",
"messages": [{"role": "user", "content": "hi"}],
"reasoning_effort": "low",
}
resolved_chat = _resolve_cursor_model_variant(chat_body, wildcard_router)
assert resolved_chat["model"] == "claude-opus-5"
assert resolved_chat["reasoning_effort"] == "low"
responses_body = {
"model": "claude-opus-5-thinking-high",
"input": [{"role": "user", "content": "hi"}],
"reasoning": {"effort": "low"},
}
resolved_responses = _resolve_cursor_model_variant(responses_body, wildcard_router)
assert resolved_responses["model"] == "claude-opus-5"
assert resolved_responses["reasoning"] == {"effort": "low"}
def test_fast_only_suffix_strips_without_reasoning(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {"model": "claude-opus-5-fast", "messages": [{"role": "user", "content": "hi"}]}
resolved = _resolve_cursor_model_variant(body, wildcard_router)
assert resolved["model"] == "claude-opus-5"
assert "reasoning_effort" not in resolved
def test_explicitly_configured_suffixed_name_untouched(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {"model": "explicit-alias-thinking-high", "messages": [{"role": "user", "content": "hi"}]}
assert _resolve_cursor_model_variant(body, wildcard_router) is body
def test_provider_inferable_bare_name_untouched(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {"model": "gpt-4o-mini", "messages": [{"role": "user", "content": "hi"}]}
assert _resolve_cursor_model_variant(body, wildcard_router) is body
def test_unservable_base_untouched(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {"model": "totally-unknown-thinking-high", "messages": [{"role": "user", "content": "hi"}]}
assert _resolve_cursor_model_variant(body, wildcard_router) is body
def test_no_router_untouched(self):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
body = {"model": "claude-opus-5-thinking-high", "messages": [{"role": "user", "content": "hi"}]}
assert _resolve_cursor_model_variant(body, None) is body
def test_missing_or_non_string_model_untouched(self, wildcard_router):
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
no_model = {"messages": [{"role": "user", "content": "hi"}]}
assert _resolve_cursor_model_variant(no_model, wildcard_router) is no_model
null_model = {"model": None, "messages": [{"role": "user", "content": "hi"}]}
assert _resolve_cursor_model_variant(null_model, wildcard_router) is null_model
def _router_serving_only(base_model: str) -> MagicMock:
mock_router = MagicMock()
mock_router.model_names = set()
mock_router.model_group_alias = {}
mock_router.team_public_model_names = frozenset()
mock_router.is_recognized_model.side_effect = lambda model: (
model in mock_router.model_names or model in mock_router.model_group_alias
)
mock_router.router_general_settings.pass_through_all_models = False
mock_router.default_deployment = None
mock_router.pattern_router.patterns = {base_model: ["anthropic/*"]}
mock_router.pattern_router.get_pattern.side_effect = lambda model: (
[{"model_name": "anthropic/*"}] if model == base_model else None
)
return mock_router
class TestCursorModelSuffixResolutionEndToEnd:
@pytest.mark.asyncio
async def test_chat_arm_rewrites_suffixed_model_before_delegation(self):
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
seen = {}
async def fake_chat_completion(request, fastapi_response, model, user_api_key_dict):
from litellm.proxy.common_utils.http_parsing_utils import _read_request_body
seen["body"] = await _read_request_body(request=request)
return {"id": "chatcmpl-fake", "object": "chat.completion", "choices": []}
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(api_key="sk-1234")
try:
with (
patch("litellm.proxy.proxy_server.llm_router", new=_router_serving_only("claude-opus-5")),
patch("litellm.proxy.proxy_server.chat_completion", new=fake_chat_completion),
):
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={
"model": "claude-opus-5-thinking-xhigh-fast",
"messages": [{"role": "user", "content": "hi"}],
},
headers={"Authorization": "Bearer sk-1234"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200
assert seen["body"]["model"] == "claude-opus-5"
assert seen["body"]["reasoning_effort"] == "xhigh"
assert seen["body"]["messages"] == [{"role": "user", "content": "hi"}]
@pytest.mark.asyncio
async def test_responses_arm_rewrites_suffixed_model_before_routing(self):
from openai.types.responses import ResponseOutputMessage, ResponseOutputText
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from litellm.types.llms.openai import ResponsesAPIResponse
mock_response = ResponsesAPIResponse(
id="resp_suffix1",
created_at=1234567890,
model="claude-opus-5",
object="response",
output=[
ResponseOutputMessage(
id="msg_suffix1",
type="message",
role="assistant",
status="completed",
content=[ResponseOutputText(type="output_text", text="ok", annotations=[])],
)
],
)
mock_router = _router_serving_only("claude-opus-5")
mock_router.aresponses = AsyncMock(return_value=mock_response)
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(api_key="sk-1234")
try:
with patch("litellm.proxy.proxy_server.llm_router", new=mock_router):
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={
"model": "claude-opus-5-thinking-high",
"input": [{"role": "user", "content": "hello"}],
},
headers={"Authorization": "Bearer sk-1234"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200
assert mock_router.aresponses.call_args is not None
assert mock_router.aresponses.call_args.kwargs["model"] == "claude-opus-5"
assert mock_router.aresponses.call_args.kwargs["reasoning"] == {"effort": "high"}
def _cursor_budget_auth_env(base_model: str, spend: float):
from litellm import Router
from litellm.caching.dual_cache import DualCache
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.hooks.model_max_budget_limiter import (
VIRTUAL_KEY_SPEND_CACHE_KEY_PREFIX,
_PROXY_VirtualKeyModelMaxBudgetLimiter,
)
valid_token = UserAPIKeyAuth(
api_key="sk-cursor-budget-test",
token="hashed-cursor-budget-token",
model_max_budget={base_model: {"budget_limit": 0.00001, "time_period": "1d"}},
)
limiter = _PROXY_VirtualKeyModelMaxBudgetLimiter(dual_cache=DualCache())
limiter.dual_cache.in_memory_cache.set_cache(
key=f"{VIRTUAL_KEY_SPEND_CACHE_KEY_PREFIX}:{valid_token.token}:{base_model}:1d",
value=spend,
)
router = Router(
model_list=[{"model_name": "anthropic/*", "litellm_params": {"model": "anthropic/*", "api_key": "fake"}}]
)
mock_proxy_logging_obj = MagicMock()
mock_proxy_logging_obj.post_call_failure_hook = AsyncMock(return_value=None)
proxy_server_attrs = {
"prisma_client": MagicMock(),
"user_api_key_cache": DualCache(),
"proxy_logging_obj": mock_proxy_logging_obj,
"master_key": "sk-master-key",
"general_settings": {},
"llm_model_list": [],
"llm_router": router,
"open_telemetry_logger": None,
"model_max_budget_limiter": limiter,
"user_custom_auth": None,
"jwt_handler": None,
"litellm_proxy_admin_name": "admin",
}
return valid_token, proxy_server_attrs
def _post_cursor_with_real_auth(valid_token, proxy_server_attrs, request_model: str):
with (
patch.multiple("litellm.proxy.proxy_server", **proxy_server_attrs),
patch(
"litellm.proxy.auth.resolvers.store.IdentityStore._resolve_key",
new_callable=AsyncMock,
return_value=valid_token,
),
):
client = TestClient(app)
return client.post(
"/cursor/chat/completions",
json={"model": request_model, "input": [{"role": "user", "content": "hi"}]},
headers={"Authorization": "Bearer sk-cursor-budget-test"},
)
class TestCursorVariantPerModelBudgetEnforcement:
"""Regression tests for the per-model budget bypass on /cursor/chat/completions.
user_api_key_auth enforced key model_max_budget against the raw request model,
but _resolve_cursor_model_variant only rewrote minted aliases like
<base>-thinking-<level> to <base> inside the handler, after auth had already
run. A key whose budget for <base> was exhausted could keep calling <base>
through any unconfigured alias. The variant must now be resolved in a
route-level dependency that runs before user_api_key_auth, so these tests
exercise the real dependency chain (real auth, real budget limiter) through
TestClient and fail if that ordering ever breaks."""
def test_minted_alias_rejected_when_base_model_budget_exhausted(self):
valid_token, attrs = _cursor_budget_auth_env(base_model="claude-opus-5", spend=1.0)
response = _post_cursor_with_real_auth(valid_token, attrs, request_model="claude-opus-5-thinking-high")
assert response.status_code == 422, response.text
error = response.json()["error"]
assert error["type"] == "budget_exceeded"
assert "exceeded budget for model=claude-opus-5" in error["message"]
def test_alias_rejection_matches_base_model_rejection(self):
valid_token, attrs = _cursor_budget_auth_env(base_model="claude-opus-5", spend=1.0)
base_response = _post_cursor_with_real_auth(valid_token, attrs, request_model="claude-opus-5")
alias_response = _post_cursor_with_real_auth(valid_token, attrs, request_model="claude-opus-5-fast")
assert base_response.status_code == 422, base_response.text
assert alias_response.status_code == 422, alias_response.text
assert alias_response.json() == base_response.json()
class TestCursorVariantResolvedBeforeAuth:
"""The route-level resolver dependency must rewrite the parsed body before
user_api_key_auth reads it, so every auth check (model access, key and
end-user model budgets, rate limits) sees the base model, and names the
router already serves must reach auth untouched."""
def _run_with_recording_auth(self, mock_router, request_model: str):
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from litellm.proxy.common_utils.http_parsing_utils import _read_request_body
from fastapi import Request
bodies_seen_by_auth = []
async def recording_auth(request: Request) -> UserAPIKeyAuth:
bodies_seen_by_auth.append(await _read_request_body(request=request))
return UserAPIKeyAuth(api_key="sk-test-cursor")
async def fake_chat_completion(request, fastapi_response, model, user_api_key_dict):
return {"id": "chatcmpl-fake", "object": "chat.completion", "choices": []}
app.dependency_overrides[user_api_key_auth] = recording_auth
try:
with (
patch("litellm.proxy.proxy_server.llm_router", new=mock_router),
patch("litellm.proxy.proxy_server.chat_completion", new=fake_chat_completion),
):
client = TestClient(app)
response = client.post(
"/cursor/chat/completions",
json={"model": request_model, "messages": [{"role": "user", "content": "hi"}]},
headers={"Authorization": "Bearer sk-test-cursor"},
)
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
assert response.status_code == 200, response.text
assert len(bodies_seen_by_auth) == 1
return bodies_seen_by_auth[0]
def test_auth_sees_base_model_for_minted_alias(self):
auth_body = self._run_with_recording_auth(
mock_router=_router_serving_only("claude-opus-5"),
request_model="claude-opus-5-thinking-xhigh-fast",
)
assert auth_body["model"] == "claude-opus-5"
assert auth_body["reasoning_effort"] == "xhigh"
def test_auth_sees_servable_model_name_untouched(self):
mock_router = _router_serving_only("claude-opus-5")
mock_router.model_names = {"claude-opus-5-thinking-high"}
auth_body = self._run_with_recording_auth(
mock_router=mock_router,
request_model="claude-opus-5-thinking-high",
)
assert auth_body["model"] == "claude-opus-5-thinking-high"
assert "reasoning_effort" not in auth_body
class TestCursorGateRecognizesRoutingGroups:
def test_group_name_variant_is_not_mangled(self):
from litellm import Router
from litellm.proxy.response_api_endpoints.endpoints import _resolve_cursor_model_variant
router = Router(
model_list=[{"model_name": "member-fast", "litellm_params": {"model": "openai/gpt-4o", "api_key": "fake"}}],
routing_groups=[
{"group_name": "grouped-thinking-high", "models": ["member-fast"], "routing_strategy": "simple-shuffle"}
],
)
body = {"model": "grouped-thinking-high", "messages": [{"role": "user", "content": "hi"}]}
resolved = _resolve_cursor_model_variant(body, router)
assert resolved["model"] == "grouped-thinking-high"
assert "reasoning_effort" not in resolved
BLOCK_MESSAGE = "Content flagged by policy, response withheld"
def _post_blocked_responses(
original_response: ResponsesAPIResponse | litellm.ModelResponse | None,
payload: Mapping[str, object] | None = None,
) -> httpx.Response:
from litellm.integrations.custom_guardrail import ModifyResponseException
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
exc = ModifyResponseException(
message=BLOCK_MESSAGE,
model="gpt-4o-mini",
request_data={"model": "gpt-4o-mini", "input": "hi"},
guardrail_name="zero-usage-regression",
original_response=original_response,
)
mock_proxy_logging = MagicMock()
mock_proxy_logging.post_call_failure_hook = AsyncMock()
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(
api_key="sk-test", request_route="/v1/responses"
)
body = {"model": "gpt-4o-mini", "input": "Write a haiku about token accounting"}
if payload:
body.update(payload)
try:
with (
patch(
"litellm.proxy.response_api_endpoints.endpoints.ProxyBaseLLMRequestProcessing.base_process_llm_request",
new=AsyncMock(side_effect=exc),
),
patch("litellm.proxy.proxy_server.proxy_logging_obj", mock_proxy_logging),
):
client = TestClient(app)
return client.post("/v1/responses", json=body, headers={"Authorization": "Bearer sk-1234"})
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
def _assert_blocked_output_item(item: Mapping[str, object], text: str) -> None:
assert item["type"] == "message"
assert item["id"].startswith("msg_")
assert item["role"] == "assistant"
assert item["status"] == "completed"
assert item["content"][0]["type"] == "output_text"
assert item["content"][0]["text"] == text
def _sse_data_frames(text: str) -> list[str]:
return [line.removeprefix("data: ").strip() for line in text.splitlines() if line.startswith("data: ")]
class TestGuardrailBlockedResponsesUsage:
"""Regression tests for https://github.com/BerriAI/litellm/issues/36880.
The ModifyResponseException handler in responses_api hardcoded the synthetic
blocked reply's usage to zeros, discarding the real token counts the blocked
upstream call consumed. The blocked reply must carry the usage from
e.original_response, exactly like /v1/chat/completions already does."""
def _post_blocked_responses(self, original_response):
return _post_blocked_responses(original_response)
def test_post_call_block_reports_real_upstream_usage(self):
from litellm.types.llms.openai import ResponseAPIUsage, ResponsesAPIResponse
original = ResponsesAPIResponse(
id="resp_upstream",
created_at=1,
model="gpt-4o-mini",
object="response",
output=[],
status="completed",
usage=ResponseAPIUsage(input_tokens=14, output_tokens=20, total_tokens=34),
)
response = self._post_blocked_responses(original)
assert response.status_code == 200, response.text
body = response.json()
assert body["output"][0]["content"][0]["text"] == "Content flagged by policy, response withheld"
assert body["usage"]["input_tokens"] == 14
assert body["usage"]["output_tokens"] == 20
assert body["usage"]["total_tokens"] == 34
def test_post_call_block_maps_bridged_chat_usage(self):
original = litellm.ModelResponse()
original.usage = litellm.Usage(prompt_tokens=14, completion_tokens=18, total_tokens=32)
response = self._post_blocked_responses(original)
assert response.status_code == 200, response.text
usage = response.json()["usage"]
assert usage["input_tokens"] == 14
assert usage["output_tokens"] == 18
assert usage["total_tokens"] == 32
def test_pre_call_block_reports_zero_usage(self):
response = self._post_blocked_responses(None)
assert response.status_code == 200, response.text
usage = response.json()["usage"]
assert usage["input_tokens"] == 0
assert usage["output_tokens"] == 0
assert usage["total_tokens"] == 0
class TestResponsesInputTokens:
"""Regression tests for POST /v1/responses/input_tokens.
The docs promise OpenAI-format token counting on the proxy, but the route was
never registered, so the POST fell through to the GET/DELETE-only
/v1/responses/{response_id} route and returned 405."""
def _post_input_tokens(
self,
body: dict[str, Any],
path: str = "/v1/responses/input_tokens",
counter: AsyncMock | None = None,
) -> tuple[Response, AsyncMock]:
from litellm.proxy._types import UserAPIKeyAuth
from litellm.proxy.auth.user_api_key_auth import user_api_key_auth
from litellm.proxy.response_api_endpoints.endpoints import _proxy_token_counter
from litellm.types.utils import TokenCountResponse
token_counter_mock = (
counter
if counter is not None
else AsyncMock(
return_value=TokenCountResponse(
total_tokens=13,
request_model=body.get("model", ""),
model_used=body.get("model", ""),
tokenizer_type="openai_api",
)
)
)
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(api_key="sk-test", request_route=path)
app.dependency_overrides[_proxy_token_counter] = lambda: token_counter_mock
try:
client = TestClient(app)
response = client.post(path, json=body, headers={"Authorization": "Bearer sk-1234"})
return response, token_counter_mock
finally:
app.dependency_overrides.pop(user_api_key_auth, None)
app.dependency_overrides.pop(_proxy_token_counter, None)
def test_string_input_returns_openai_input_tokens_shape(self):
response, counter = self._post_input_tokens({"model": "gpt-4o", "input": "Hello, how are you?"})
assert response.status_code == 200, response.text
assert response.json() == {"object": "response.input_tokens", "input_tokens": 13}
counter.assert_awaited_once()
assert counter.call_args.kwargs["call_endpoint"] is True
token_request = counter.call_args.kwargs["request"]
assert token_request.model == "gpt-4o"
assert token_request.messages == [{"role": "user", "content": "Hello, how are you?"}]
def test_every_route_alias_is_registered(self):
for path in ("/v1/responses/input_tokens", "/responses/input_tokens", "/openai/v1/responses/input_tokens"):
response, _ = self._post_input_tokens({"model": "gpt-4o", "input": "hi"}, path=path)
assert response.status_code == 200, f"{path}: {response.status_code} {response.text}"
def test_input_items_instructions_and_tools_are_forwarded(self):
tools = [
{
"type": "function",
"name": "get_weather",
"description": "Get weather for a city",
"parameters": {"type": "object", "properties": {"city": {"type": "string"}}},
}
]
response, counter = self._post_input_tokens(
{
"model": "gpt-4o",
"input": [{"role": "user", "content": "What is the weather in Paris?"}],
"instructions": "You are terse.",
"tools": tools,
}
)
assert response.status_code == 200, response.text
token_request = counter.call_args.kwargs["request"]
assert token_request.messages == [
{"role": "system", "content": "You are terse."},
{"role": "user", "content": "What is the weather in Paris?"},
]
assert token_request.tools == tools
def test_missing_model_returns_openai_400(self):
response, counter = self._post_input_tokens({"input": "Hello"})
assert response.status_code == 400, response.text
assert response.json() == {
"error": {
"message": "Missing required parameter: 'model'.",
"type": "invalid_request_error",
"param": "model",
"code": "missing_required_parameter",
}
}
counter.assert_not_awaited()
def test_missing_input_returns_openai_400(self):
response, counter = self._post_input_tokens({"model": "gpt-4o"})
assert response.status_code == 400, response.text
assert response.json() == {
"error": {
"message": "Missing required parameter: 'input'.",
"type": "invalid_request_error",
"param": "input",
"code": "missing_required_parameter",
}
}
counter.assert_not_awaited()
@pytest.mark.parametrize("empty_input", ["", []])
def test_empty_input_returns_openai_400(self, empty_input):
response, counter = self._post_input_tokens({"model": "gpt-4o", "input": empty_input})
assert response.status_code == 400, response.text
assert response.json() == {
"error": {
"message": """One of "input" or "previous_response_id" or 'prompt' or 'conversation' must be provided.""",
"type": "invalid_request_error",
"param": None,
"code": "missing_required_parameter",
}
}
counter.assert_not_awaited()
def test_invalid_tools_returns_openai_400(self):
response, counter = self._post_input_tokens({"model": "gpt-4o", "input": "hi", "tools": "not-a-list"})
assert response.status_code == 400, response.text
error = response.json()["error"]
assert error["type"] == "invalid_request_error"
counter.assert_not_awaited()
def test_provider_error_maps_status_code(self):
from litellm.proxy._types import ProxyException
failing_counter = AsyncMock(
side_effect=ProxyException(
message="rate limited",
type="token_counting_error",
param="model",
code="429",
)
)
response, _ = self._post_input_tokens({"model": "gpt-4o", "input": "hi"}, counter=failing_counter)
assert response.status_code == 429, response.text
assert response.json()["error"]["message"] == "rate limited"
class TestGuardrailBlockedResponsesShape:
"""A pre_call block raises ModifyResponseException before any provider call.
The reply must satisfy the Responses API contract the request selected:
stream=true answers SSE ending in one response.completed whose output[0] is
a completed assistant message item with output_text content, and a plain
POST answers JSON with the same item, both with the usage the blocked call
consumed (zero for pre_call)."""
def test_non_stream_block_is_a_completed_assistant_message(self):
response = _post_blocked_responses(None)
assert response.status_code == 200, response.text
assert response.headers["content-type"].startswith("application/json")
body = response.json()
_assert_blocked_output_item(body["output"][0], BLOCK_MESSAGE)
assert body["usage"]["total_tokens"] == 0
def test_stream_block_answers_sse_with_completed_event(self):
response = _post_blocked_responses(None, payload={"stream": True})
assert response.status_code == 200, response.text
assert response.headers["content-type"].startswith("text/event-stream")
frames = _sse_data_frames(response.text)
assert frames[-1] == "[DONE]"
events = [json.loads(frame) for frame in frames[:-1]]
types = [event["type"] for event in events]
assert "response.created" in types
completed = [event for event in events if event["type"] == "response.completed"]
assert len(completed) == 1
completed_response = completed[0]["response"]
_assert_blocked_output_item(completed_response["output"][0], BLOCK_MESSAGE)
assert completed_response["usage"]["total_tokens"] == 0
delta_text = "".join(event["delta"] for event in events if event["type"] == "response.output_text.delta")
assert delta_text == BLOCK_MESSAGE
def test_stream_block_keeps_upstream_usage(self):
from litellm.types.llms.openai import ResponseAPIUsage, ResponsesAPIResponse
original = ResponsesAPIResponse(
id="resp_upstream",
created_at=1,
model="gpt-4o-mini",
object="response",
output=[],
status="completed",
usage=ResponseAPIUsage(input_tokens=14, output_tokens=20, total_tokens=34),
)
response = _post_blocked_responses(original, payload={"stream": True})
assert response.status_code == 200, response.text
frames = _sse_data_frames(response.text)
completed = [json.loads(frame) for frame in frames[:-1] if json.loads(frame)["type"] == "response.completed"]
usage = completed[0]["response"]["usage"]
assert usage["input_tokens"] == 14
assert usage["output_tokens"] == 20
assert usage["total_tokens"] == 34
def test_responses_routes_document_response_models_in_openapi_schema():
from typing import cast
from fastapi import FastAPI
from litellm.proxy.response_api_endpoints.endpoints import router
def as_object(value: object) -> dict[str, object]:
assert isinstance(value, dict)
return cast(dict[str, object], value)
openapi_app = FastAPI()
openapi_app.include_router(router)
openapi: Final = cast(dict[str, object], openapi_app.openapi())
def ok_200_properties(path: str, method: str) -> dict[str, object]:
operation: Final = as_object(as_object(as_object(openapi)["paths"])[path])[method]
schema: Final = as_object(
as_object(
as_object(as_object(as_object(as_object(operation)["responses"])["200"])["content"])["application/json"]
)["schema"]
)
ref: Final = schema["$ref"]
assert isinstance(ref, str)
component: Final = ref.rsplit("/", 1)[-1]
return as_object(
as_object(as_object(as_object(as_object(openapi)["components"])["schemas"])[component])["properties"]
)
assert "output" in ok_200_properties("/v1/responses", "post")
assert "output" in ok_200_properties("/v1/responses/{response_id}", "get")
assert "deleted" in ok_200_properties("/v1/responses/{response_id}", "delete")
assert "data" in ok_200_properties("/v1/responses/{response_id}/input_items", "get")
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