diff --git a/tests/gateway/test_chat_completions_approval.py b/tests/gateway/test_chat_completions_approval.py
index 44d0eaf5f7..ba4dd9c69e 100644
--- a/tests/gateway/test_chat_completions_approval.py
+++ b/tests/gateway/test_chat_completions_approval.py
@@ -1,23 +1,59 @@
-"""Legacy /v1/chat/completions streams surface approval requests (#51871)."""
+"""Legacy /v1/chat/completions streams surface approval requests that the client can resolve
+through ``POST /v1/runs/{completion_id}/approval`` (#51871)."""
 import asyncio
+import json
+from unittest.mock import MagicMock, patch
 
-from gateway.platforms.api_server import ThreadSafeAsyncQueue
-from gateway.platforms.api_server_openai_routes import OpenAICompatRoutesMixin
+import pytest
+from aiohttp.test_utils import TestClient, TestServer
+
+from tests.gateway.test_api_server import _create_app, _make_adapter
 
 
-class _Host(OpenAICompatRoutesMixin):
-    def __init__(self):
-        self._run_approval_sessions = {}
+def _approval_agent(decisions):
+    agent = MagicMock()
+    agent.session_prompt_tokens = agent.session_completion_tokens = agent.session_total_tokens = 0
+
+    def run_conversation(**_kw):
+        # The real blocking wait the terminal guard uses, reached through the turn's contextvar.
+        from tools.approval import _gateway_notify_cb
+        from tools.approval_context import get_current_session_key
+        from tools.approval_gateway_wait import _await_gateway_decision
+        key = get_current_session_key(default="")
+        decisions.append(_await_gateway_decision(
+            key, _gateway_notify_cb(key), {"command": "rm -rf /tmp/x", "description": "dangerous",
+                                           "pattern_key": "rm"}))
+        return {"final_response": "ok", "messages": []}
+    agent.run_conversation.side_effect = run_conversation
+    return agent
 
 
-def test_stream_approval_keyed_by_completion_id_and_enqueued():
-    async def _go():
-        host, q = _Host(), ThreadSafeAsyncQueue()
-        notify = host._register_stream_approval("chatcmpl-1", q, "sess-1")
-        assert host._run_approval_sessions == {"chatcmpl-1": "chatcmpl-1"}
-        notify({"command": "rm -rf /", "description": "dangerous"})
-        kind, event = await asyncio.wait_for(q.get(), 2)
-        assert kind == "__approval__"
-        assert event["event"] == "approval.request" and event["run_id"] == "chatcmpl-1"
-        assert "once" in event["choices"] and "deny" in event["choices"]
-    asyncio.run(_go())
+@pytest.mark.asyncio
+async def test_streamed_completion_approval_resolves_via_runs_endpoint(monkeypatch):
+    # Bound the agent thread's blocking wait so a regression fails fast instead of holding teardown.
+    monkeypatch.setattr("tools.approval_context._get_approval_timeout", lambda: 5)
+    adapter, decisions = _make_adapter(), []
+    app = _create_app(adapter)
+    app.router.add_post("/v1/runs/{run_id}/approval", adapter._handle_run_approval)
+    async with TestClient(TestServer(app)) as cli:
+        with patch.object(adapter, "_create_agent", side_effect=lambda **_k: _approval_agent(decisions)):
+            resp = await cli.post("/v1/chat/completions", json={
+                "model": "hermes-agent", "stream": True, "messages": [{"role": "user", "content": "hi"}]})
+            assert resp.status == 200
+            async def _first_approval():
+                event = None
+                async for raw in resp.content:
+                    line = raw.decode().strip()
+                    if line == "event: approval.request":
+                        event = "next"
+                    elif event == "next" and line.startswith("data: "):
+                        return json.loads(line[6:])
+                return None
+            event = await asyncio.wait_for(_first_approval(), 10)
+            assert event and event["run_id"].startswith("chatcmpl") and event["command"]
+            approval = await cli.post(f"/v1/runs/{event['run_id']}/approval", json={"choice": "once"})
+            assert approval.status == 200, await approval.text()
+            assert "[DONE]" in (await asyncio.wait_for(resp.text(), 10))
+    assert decisions and decisions[0]["choice"] == "once"
+    assert event["run_id"] not in adapter._run_approval_sessions
+    assert adapter._run_statuses[event["run_id"]]["status"] == "completed"
diff --git a/tests/gateway/test_session_chat_approval.py b/tests/gateway/test_session_chat_approval.py
index 4d175ed5eb..b86ef06712 100644
--- a/tests/gateway/test_session_chat_approval.py
+++ b/tests/gateway/test_session_chat_approval.py
@@ -1,5 +1,6 @@
 """Session chat streams surface approval requests keyed by run id (#58856)."""
 import asyncio
+from unittest.mock import patch
 
 from gateway.platforms.api_server import APIServerAdapter, _SessionEventQueue
 
@@ -11,7 +12,9 @@ def test_session_stream_approval_keyed_by_run_id_and_enqueued():
         events = _SessionEventQueue("sess-1", "run_1")
         notify = host._register_session_stream_approval("run_1", events, "msg_1")
         assert host._run_approval_sessions == {"run_1": "run_1"}
-        await asyncio.to_thread(notify, {"command": "rm -rf /", "description": "dangerous"})
+        with patch.object(host, "_set_run_status") as set_status:
+            await asyncio.to_thread(notify, {"command": "rm -rf /", "description": "dangerous"})
+        assert set_status.call_args.args == ("run_1", "waiting_for_approval")
         name, event = await asyncio.wait_for(events.queue.get(), 2)
         assert name == "approval.request"
         assert event["run_id"] == "run_1" and event["message_id"] == "msg_1"