fix: disable upstream stream timeouts by default

.env.example

@@ -72,6 +72,12 @@ ROUTSTR_SECRET_KEY=
 # UPSTREAM_POOL_TIMEOUT=5
 # UPSTREAM_READ_TIMEOUT=900
 
+# Upstream Streaming Guards (0 disables; keep above reasoning models' think time)
+# UPSTREAM_FIRST_TOKEN_TIMEOUT_SECONDS=0
+# UPSTREAM_STREAM_IDLE_TIMEOUT_SECONDS=0
+# UPSTREAM_ALLOWED_FAILS=3
+# UPSTREAM_COOLDOWN_SECONDS=30
+
 # Logging
 # LOG_LEVEL=INFO
 # ENABLE_CONSOLE_LOGGING=true

routstr/core/settings.py

@@ -40,14 +40,15 @@ class Settings(BaseSettings):
     upstream_5xx_retry_attempts: int = Field(
         default=1, ge=0, env="UPSTREAM_5XX_RETRY_ATTEMPTS"
     )
-    # Streaming guards, both disabled by 0. A stream that never produces a
+    # Streaming guards, off by default (0). A stream that never produces a
     # first chunk can still fail over; one that stalls later can only be
-    # aborted and billed for what it delivered.
+    # aborted and billed for what it delivered. Reasoning models can stay
+    # silent for minutes, so set these above the longest expected think time.
     upstream_first_token_timeout_seconds: float = Field(
-        default=60.0, ge=0, env="UPSTREAM_FIRST_TOKEN_TIMEOUT_SECONDS"
+        default=0.0, ge=0, env="UPSTREAM_FIRST_TOKEN_TIMEOUT_SECONDS"
     )
     upstream_stream_idle_timeout_seconds: float = Field(
-        default=120.0, ge=0, env="UPSTREAM_STREAM_IDLE_TIMEOUT_SECONDS"
+        default=0.0, ge=0, env="UPSTREAM_STREAM_IDLE_TIMEOUT_SECONDS"
     )
     # Circuit breaker: timeouts/5xx per (provider, model) within a minute that
     # take the pair out of candidate selection. 0 seconds disables it.

tests/unit/test_upstream_stream_timeout.py

@@ -15,7 +15,7 @@ from routstr.core.error_scope import (
     ERROR_SCOPE_UPSTREAM,
 )
 from routstr.core.exceptions import UpstreamError
-from routstr.core.settings import settings
+from routstr.core.settings import Settings, settings
 from routstr.upstream.base import BaseUpstreamProvider
 from routstr.upstream.cooldown import is_cooling_down, record_failure
 from routstr.upstream.stream_timeout import open_guarded_stream
@@ -149,15 +149,12 @@ async def test_zero_first_token_timeout_disables_the_guard(
     assert [chunk async for chunk in stream] == [b"first"]
 
 
-@pytest.mark.asyncio
-async def test_idle_timeout_ends_the_stream_without_raising(
-    fast_timeouts: None,
-) -> None:
-    stream = await open_guarded_stream(_response(_stalls_after_first()), "test")
-
-    # The stalled stream ends after the delivered bytes; the caller's finalizer
-    # then settles actual usage instead of the request hanging.
-    assert [chunk async for chunk in stream] == [b"first"]
+def test_stream_guards_are_off_by_default() -> None:
+    # Reasoning models can think silently for minutes; on by default, the
+    # guards would fail requests that succeed without them.
+    fields = Settings.__fields__
+    assert fields["upstream_first_token_timeout_seconds"].default == 0
+    assert fields["upstream_stream_idle_timeout_seconds"].default == 0
 
 
 @pytest.mark.asyncio