fix(gateway): default an Anthropic client timeout so the non-streaming pre-flight guard does not 502 - #799
fix(gateway): default an Anthropic client timeout so the non-streaming pre-flight guard does not 502#799AmirF194 wants to merge 3 commits into
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…g pre-flight guard does not 502 Anthropic's SDK raises a status-less ValueError before any request is sent when a non-streaming call's max_tokens implies more than 10 minutes and the client's timeout is untouched. build_attempt_client_args never set one, so both the bare no-extra_params path and the hybrid-mode extra_params path built an Anthropic client with the SDK's own default, and classify_provider_error returned None for the status-less error, collapsing it to a generic 502. Give Anthropic clients an explicit default timeout (the SDK's own default value, so this only defuses the guard rather than changing behavior) unless an operator already configured one, and add a classifier branch so any occurrence that still reaches it maps to a 400 naming the cause instead of a generic 502. Fixes mozilla-ai#533
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WalkthroughChangesAnthropic timeout handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to Anthropic requests configured with a null timeout can run without a timeout rather than receiving the safe default, potentially tying up request capacity indefinitely. Handle null as missing before merging. Suggested reviewers: 🚥 Pre-merge checks | ✅ 2 | ❌ 3❌ Failed checks (3 warnings)
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Pull request overview
This PR fixes an Anthropic-specific failure mode in the gateway where large non-streaming requests could be rejected client-side by the Anthropic SDK’s pre-flight timeout guard, then surfaced as an opaque 502 with no billing signal. It ensures Anthropic clients are constructed with an explicit timeout (matching the SDK’s default) to bypass the guard and adds a classifier fallback that maps the guard’s status-less failure to an actionable 400.
Changes:
- Inject an explicit default Anthropic
timeoutintoclient_argswhen none is provided (standalone config path and platform/hybrid attempt path). - Add a provider error classification branch to map the Anthropic non-streaming timeout-guard
ValueError(including wrapped forms) to HTTP 400 with a fixed, actionable detail. - Add/extend unit tests covering config kwargs injection, hybrid routing propagation into the real SDK client, and classification behavior.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
src/gateway/services/provider_kwargs.py |
Adds Anthropic default timeout constant + helper and applies it when building Anthropic provider kwargs. |
src/gateway/api/routes/_platform.py |
Ensures platform-resolved attempts also inject the Anthropic default timeout into client_args (including hybrid/extra_params path). |
src/gateway/api/routes/_pipeline.py |
Adds a specific classifier for the Anthropic non-streaming timeout guard and a new fixed 400 detail. |
tests/unit/test_provider_instances.py |
Adds unit coverage for Anthropic timeout injection behavior in get_provider_kwargs and the helper. |
tests/unit/test_provider_error_classification.py |
Adds unit coverage for the new Anthropic guard classification (direct, wrapped, and any-llm-translated shapes). |
tests/unit/test_hybrid_client_args_routing.py |
Adds regression tests ensuring the explicit timeout reaches the real Anthropic SDK client (standalone and hybrid-mode shapes). |
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| attempt, | ||
| {"messages": [{"role": "user", "content": "hi"}], "max_tokens": 65536, "stream": False}, | ||
| ) | ||
| assert kwargs["client_args"]["timeout"] == 600.0 |
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Notes, not a block. Finding 1 is a behavior change on paths this fix was not aimed at, so worth a look before merge.
Two docs are now out of step with the code (neither file is in the diff, so no inline anchor):
docs/hybrid-mode-protocol.md:140still presents Bedrock as the only provider that gets handling beyond the genericextra_params->client_argsnesting. Anthropic is now a second one. The_platform.pydocstring was updated for this; the doc was not, and per the rootAGENTS.mdthe stale copy is the one someone believes.docs/configuration.md:397listsclient_argsas "Extra client options:custom_headers,timeout(optional)" with no note that an Anthropic instance now gets atimeoutfilled in when none is configured.
Lint, mypy --strict, and the three touched test files (139 passed) are clean locally. No generated-artifact obligation: no route or schema changed.
Review written by Claude Code (Opus 5), posted by @KhaledOsm.
| if provider != LLMProvider.ANTHROPIC: | ||
| return client_args | ||
| merged = dict(client_args) if client_args else {} | ||
| merged.setdefault("timeout", ANTHROPIC_DEFAULT_TIMEOUT_SECONDS) |
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A flat float raises the Anthropic client's connect timeout from 5s to 600s on every request, including the streaming ones the guard never touched. Verified against the installed SDK:
anthropic._constants.DEFAULT_TIMEOUT -> Timeout(connect=5.0, read=600, write=600, pool=600)
_calculate_nonstreaming_timeout(...) -> Timeout(connect=5.0, read=600, write=600, pool=600)
AsyncAnthropic(timeout=600.0).timeout -> Timeout(timeout=600.0) # connect=600.0
The guard's trigger is self._client.timeout == DEFAULT_TIMEOUT (anthropic/resources/messages/messages.py:1061), so 600.0 disarms it only because it is unequal to the default, and the inequality is exactly the connect dimension. There is no client-level value that both disarms the guard and keeps connect=5.0: httpx.Timeout(600.0, connect=5.0) compares equal to DEFAULT_TIMEOUT and re-arms it. This also reaches alist_models, where the surrounding code already treats a 600s hang as a hazard (model_discovery_service.py:317, "so a black-holed endpoint cannot hang the test button for the SDK's ~600s default").
A per-request timeout disarms the guard and leaves the client at DEFAULT_TIMEOUT. Against the real any-llm/Anthropic stack with httpx.AsyncClient.send patched:
client_args {"timeout": 600.0} -> APIConnectionError (guard skipped, connect=600)
client_args httpx.Timeout(600.0, connect=5.0) -> InvalidRequestError (guard re-armed)
acompletion(..., timeout=600.0) -> APIConnectionError (guard skipped, connect=5)
Fix: inject timeout as a completion kwarg instead of into client_args. That moves the injection to where request kwargs are assembled (default_attempt_kwargs, responses.py:381, and the standalone path) rather than get_provider_kwargs, so it is a wider change than this one. If it has to stay client-level, httpx.Timeout(601.0, connect=5.0) keeps the 5s connect.
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You are right on every part of this, and I reproduced it before changing anything. In a Docker container with anthropic 0.88.0 installed, AsyncAnthropic(timeout=600.0)._client.timeout is Timeout(timeout=600.0), and its connect attribute reads 600.0, not 5.0. anthropic._constants.DEFAULT_TIMEOUT is Timeout(connect=5.0, read=600, write=600, pool=600), and the guard in messages.py checks self._client.timeout == DEFAULT_TIMEOUT exactly as you quoted. I also patched httpx.AsyncClient.send and ran your three cases through the real SDK: a flat 600.0 skips the guard and reaches the transport layer with connect=600, httpx.Timeout(600.0, connect=5.0) compares equal to DEFAULT_TIMEOUT and puts the guard back, and httpx.Timeout(601.0, connect=5.0) skips the guard and reaches the transport with connect still at 5.0.
I went with your client-level alternative rather than moving this to a completion kwarg. with_anthropic_default_timeout now injects httpx.Timeout(601.0, connect=5.0) instead of a flat float. That function already backs both call sites, get_provider_kwargs and build_attempt_client_args, so the platform-attempt path gets the fix too without touching responses.py or the completion-kwarg assembly. A new test in test_hybrid_client_args_routing.py drives an attempt through the real any-llm/anthropic stack and captures the constructed httpx.AsyncClient's own timeout to confirm connect lands at 5.0 end to end, not just in our own dict construction.
Pushed at 4bdef8c.
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| # The anthropic SDK's non-streaming pre-flight guard fires for a large max_tokens | ||
| # only while the client's timeout is untouched (otari#533); this is also the | ||
| # guard's own fallback value, so setting it explicitly disables the guard alone. |
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Nothing ties 600.0 to anthropic.DEFAULT_TIMEOUT, so if the SDK bumps its default the constant diverges silently and this comment's "also the guard's own fallback value" goes stale. Add the drift assertion this repo already uses for the same class of coupling (test_the_uncredentialed_provider_roster_has_not_drifted):
assert anthropic.DEFAULT_TIMEOUT.read == ANTHROPIC_DEFAULT_TIMEOUT_SECONDSThere was a problem hiding this comment.
Agreed on the drift risk, though the exact assertion changed shape along with the fix. Since with_anthropic_default_timeout now injects httpx.Timeout(601.0, connect=5.0) instead of a flat 600.0 (see the reply on the finding above), the constant that has to track the SDK is the connect value, not the read value. tests/unit/test_provider_instances.py now has test_anthropic_default_timeout_constants_track_the_sdks_own_default, asserting anthropic.DEFAULT_TIMEOUT.connect == ANTHROPIC_DEFAULT_CONNECT_TIMEOUT_SECONDS and that the httpx.Timeout we build stays unequal to anthropic.DEFAULT_TIMEOUT. Either one drifting fails the test.
Pushed at 4bdef8c.
| # whole signal here, and its message names the unsupported feature. | ||
| if _is_unsupported_feature_error(exc): | ||
| return ProviderErrorMapping(status.HTTP_400_BAD_REQUEST, _unsupported_feature_detail(exc)) | ||
| # Defense in depth for otari#533: an operator-supplied timeout equal to the |
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The scenario named here cannot occur. A YAML client_args: {timeout: 600} becomes httpx.Timeout(600.0), which is not equal to DEFAULT_TIMEOUT (connect=5.0), so an operator-supplied timeout equal to the SDK's default is not expressible from config and never re-arms the guard.
Keep the branch: it still catches any-llm's InvalidRequestError translation and any future Anthropic client built without with_anthropic_default_timeout. Reword the justification, or the next reader will trust it.
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You're right about the mechanism, and I rewrote the comment rather than the branch. An operator's client_args.timeout can only ever arrive as a flat number from config, and a flat number sets every httpx.Timeout dimension including connect, so it can equal DEFAULT_TIMEOUT only by also setting connect to 5.0, at which point read/write/pool are 5.0 too, not 600. Config alone can't reproduce the real default, so the old comment's stated scenario doesn't happen.
The branch itself stays, and the comment now says what it actually catches: a client built without with_anthropic_default_timeout, i.e. some future call path that skips get_provider_kwargs and build_attempt_client_args. That client is left at the SDK's real default and can still trip the guard for a large max_tokens.
Pushed at 4bdef8c.
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| def test_get_provider_kwargs_fills_a_default_anthropic_timeout() -> None: |
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get_provider_kwargs(GatewayConfig(), ANTHROPIC) now returns {"client_args": {"timeout": 600.0}} where it returned {}. It still reports exhausted, because client_args is already in _NON_CREDENTIAL_KWARGS, but that is load-bearing for the organization-key and fallback-rung paths and nothing here holds it. Worth pinning alongside these:
def test_a_default_anthropic_timeout_does_not_look_like_a_credential() -> None:
kwargs = get_provider_kwargs(GatewayConfig(), LLMProvider.ANTHROPIC)
assert credential_ladder_exhausted(LLMProvider.ANTHROPIC, kwargs) is TrueThere was a problem hiding this comment.
Added, close to what you proposed. tests/unit/test_provider_instances.py now has test_a_default_anthropic_timeout_does_not_look_like_a_credential, asserting that get_provider_kwargs(GatewayConfig(), LLMProvider.ANTHROPIC) still reports credential_ladder_exhausted() as True. It pins exactly the thing you flagged: a default-filled client_args stays in _NON_CREDENTIAL_KWARGS and never gets read as a credential by itself.
Pushed at 4bdef8c.
Dismissing the blocking state; posting these as non-blocking comments instead. The findings stand.
…streaming-timeout-guard # Conflicts: # src/gateway/api/routes/_pipeline.py # tests/unit/test_provider_error_classification.py
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A flat float timeout disarms the anthropic SDK's non-streaming pre-flight guard, but the SDK expands a flat float into an httpx.Timeout that sets every dimension including connect, raising it from 5s to 600s on every Anthropic request. Inject an explicit httpx.Timeout with connect pinned at the SDK's own default instead. Also add a drift assertion on the SDK's own default, reword an inaccurate defense-in-depth comment, pin the credential ladder against a default-filled client_args, and update the two docs that were never touched for the original fix (otari#799 review).
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Both of these are right, and both are fixed now. docs/hybrid-mode-protocol.md has a new paragraph right after the Bedrock section describing Anthropic's default-timeout fill-in and why it's an httpx.Timeout rather than a flat number. docs/configuration.md's client_args row now has a note that an anthropic instance gets a default timeout filled in when none is configured, so an operator reading that table sees it without having to find the code. Pushed at 4bdef8c. |
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Inline comments:
In `@src/gateway/services/provider_kwargs.py`:
- Around line 128-131: Update the timeout injection around merged.setdefault so
a timeout value of None is replaced with the existing Anthropic default Timeout,
while preserving explicit values including 0. Add a regression test covering
timeout=None and verifying the default is injected.
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| merged.setdefault( | ||
| "timeout", | ||
| httpx.Timeout(ANTHROPIC_DEFAULT_TIMEOUT_SECONDS, connect=ANTHROPIC_DEFAULT_CONNECT_TIMEOUT_SECONDS), | ||
| ) |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
🔎 Supported by static analysis
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import anthropic
client = anthropic.AsyncAnthropic(api_key="sk-test", timeout=None)
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anthropic Python 0.88.0 AsyncAnthropic timeout=None DEFAULT_TIMEOUT messages non-streaming pre-flight guard
💡 Result:
In the Anthropic Python SDK (v0.88.0), the SDK includes a safety mechanism for non-streaming requests to ensure they do not exceed reasonable time limits [1][2][3]. Default Timeout and Safety Guard The SDK defines a DEFAULT_TIMEOUT of 10 minutes [4]. For non-streaming requests, the SDK performs a pre-flight "guard" check [5]. If a request is expected to take longer than this 10-minute threshold—calculated based on the provided max_tokens and model—the SDK will raise a ValueError [1][2][6]. This guard specifically checks if: 1. The request is non-streaming (stream=False) [5]. 2. The user has not explicitly provided a custom timeout [5]. 3. The client is still using the DEFAULT_TIMEOUT [5]. If these conditions are met, the SDK runs internal logic to estimate the duration [5]. If that estimate exceeds the limit, it throws the error: "Streaming is required for operations that may take longer than 10 minutes" [6]. How to Disable the Guard You can bypass this pre-flight check and the associated error by either: - Enabling streaming (stream=True) [1][2]. - Explicitly overriding the timeout at the client or request level (e.g., setting a higher timeout or passing None) [1][2][3]. AsyncAnthropic Context The AsyncAnthropic client follows these same patterns and logic for timeouts as the synchronous Anthropic client [7][1]. When initializing an asynchronous client, you can pass a custom timeout value (as a float or httpx.Timeout object) to override the 10-minute default and prevent the SDK from triggering the non-streaming guard [1][2]. Note: Setting timeout=None on an httpx client (which the SDK wraps) instructs the underlying library to wait indefinitely, effectively disabling any timeout-based aborts by the client [8].
Citations:
- 1: https://github.com/anthropics/anthropic-sdk-python/blob/3955600d/README.md
- 2: https://platform.claude.com/docs/en/cli-sdks-libraries/sdks/python
- 3: https://pypi.org/project/anthropic/0.83.0/
- 4: https://github.com/anthropics/anthropic-sdk-python/blob/main/src/anthropic/_constants.py
- 5: https://github.com/anthropics/anthropic-sdk-python/blob/main/src/anthropic/resources/messages/messages.py
- 6: GitHub issue 1430 in anthropics/anthropic-sdk-python (link omitted to avoid creating a cross-reference)
- 7: https://github.com/anthropics/anthropic-sdk-python/blob/d2f6543e/src/anthropic/_base_client.py
- 8: https://github.com/anthropics/anthropic-sdk-python/blob/d2f6543e/tests/test_client.py
Treat None as missing when injecting the Anthropic timeout.
setdefault passes timeout=None to AsyncAnthropic. Anthropic 0.88.0 treats this as no timeout, so requests can wait indefinitely. Use an is None check, preserve 0 and other explicit values, and add a regression test.
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In `@src/gateway/services/provider_kwargs.py` around lines 128 - 131, Update the
timeout injection around merged.setdefault so a timeout value of None is
replaced with the existing Anthropic default Timeout, while preserving explicit
values including 0. Add a regression test covering timeout=None and verifying
the default is injected.
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Checked the mechanism against the installed SDK and it holds up: the guard is not stream and not is_given(timeout) and self._client.timeout == DEFAULT_TIMEOUT, and its non-raising branch returns Timeout(600, connect=5.0), identical to what the client would have used anyway. So disarming it by inequality costs nothing for a small max_tokens, and building the httpx.Timeout explicitly to keep connect at 5s rather than passing a flat float is the right call. credential_ladder_exhausted staying pinned is the load-bearing test here.
Three non-blocking points inline.
Review by Claude Opus 5 via Claude Code, run against the repo's review skill and the scoped guidance in src/gateway/AGENTS.md, backend-standards, and .github/instructions/.
| # read/write/pool one second above the SDK's own default and connect pinned at | ||
| # the SDK's own default, disarms the guard (unequal to DEFAULT_TIMEOUT on | ||
| # read/write/pool) without touching connect at all. | ||
| ANTHROPIC_DEFAULT_TIMEOUT_SECONDS = 601.0 |
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The name reads as "the SDK's default" but this is default + 1, and the PR description states it is "the SDK's own default value". Derive it instead of restating it:
httpx.Timeout(anthropic.DEFAULT_TIMEOUT.read + 1, connect=anthropic.DEFAULT_TIMEOUT.connect)Then neither constant can go stale against an SDK bump, and test_anthropic_default_timeout_constants_track_the_sdks_own_default stops being load-bearing for correctness.
| # (any future call path that does not route through get_provider_kwargs or | ||
| # build_attempt_client_args), which is left at the SDK's real default and can | ||
| # still trip the guard for a large max_tokens. | ||
| if _is_anthropic_nonstreaming_timeout_guard(exc): |
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This branch is unreachable through either client-construction path once the timeout is injected, and it couples the classifier to an English sentence in a vendored SDK. Meanwhile any-llm 1.25's _translating_nonstreaming_guard already converts the guard into an InvalidRequestError whose message names the actual max_tokens value, which this replaces with a fixed string.
Classifying a status-less any_llm.exceptions.InvalidRequestError as a 400 through _redacted_caller_fault_detail is reachable today, generalizes to every other status-less InvalidRequestError, keeps the more specific message, and sits on the same rung as the existing _is_unsupported_feature_error branch.
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| For an `anthropic` instance, a `timeout` is filled in automatically when | ||
| `client_args` does not set one, so the anthropic SDK's non-streaming | ||
| pre-flight guard does not turn a large `max_tokens` into an opaque 502 |
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The guard has a second raise condition the injected timeout also disarms: MODEL_NONSTREAMING_TOKENS (the opus-4 family, capped at 8192). Those requests now round-trip to Anthropic for the rejection instead of failing pre-flight. Worth naming here, since this paragraph and the hybrid-protocol note both describe only the 10-minute case.
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Hey @AmirF194 , thanks for your patience on this one. Tbh we're in the middle of a huge codebase refactor to open source almost all of our otari.ai platform, so we didn't have time to dig into this ticket as much as we needed to. The code here is well implemented and really appreciate the iterations based on comments. However, I think at the core, the problem that is being fixed here mostly belongs in any-llm and not otari. And, since we originally created the issue this PR solves, we have since added a toggle into any-llm so that otari only needs a small change to benefit from the any-llm feature. Sorry again about all the back and forth, and hopefully you're not discouraged from continuing to make contributions! Things will soon be back to normal in the next few weeks once we finish this big migration. 🙏 Here's Claudes full feedback for context: #533 was written against any-llm-sdk==1.24.0, and its suggested fix named client_args in build_attempt_client_args. That was right at 1.24.0. mozilla-ai/any-llm#1255 then landed a first-class timeout on acompletion for this same SDK guard, reported upstream as mozilla-ai/any-llm#1251, and otari picked it up when #777 moved the floor to 1.25.0 on 2026-08-25. This PR opened a day later, so it implements an instruction whose premise had already changed. The work here follows the issue faithfully; the issue was the stale part. Passing any-llm's timeout lifts the guard, and on current main it is documented on messages and responses as well, with TIMEOUT_SUPPORT declaring it per provider, native on anthropic and inherited by azureanthropic and vertexaianthropic. Going through client_args instead couples otari to the dimension structure of anthropic.DEFAULT_TIMEOUT and to a hand-maintained set of anthropic-SDK providers that BaseAnthropicProvider already groups. That set is short by two here: azureanthropic and vertexaianthropic reach the same messages.create and still fail on the request this fixes for anthropic. Upstream declined to default the timeout as a deliberate choice, making it settable and the error legible instead, since a silent 600s default turns a request that needs streaming into a ten-minute hang. Two follow-ups:
The root-cause analysis, the max_tokens > 128000/6 boundary and the MODEL_NONSTREAMING_TOKENS second trigger are accurate and carry into both. |
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Appreciate the detailed writeup, that pins down exactly why this landed a day too late: any-llm's own timeout support closes the guard at a lower layer than client_args ever could, and it covers azureanthropic/vertexaianthropic too, which my approach didn't. Good call closing in favor of that. The status-less InvalidRequestError to 400 mapping in classify_provider_error still stands on its own regardless of which timeout path ships, so #989 makes sense as separate work. |
Description
A non-streaming Anthropic request with
max_tokensabove roughly 21,333 failswith a generic
502 {"detail": "LLM provider error"}and bills no tokens. TheAnthropic SDK builds its client with no explicit
timeouthere, so its ownnon-streaming pre-flight guard (
_calculate_nonstreaming_timeout) fireswhenever
max_tokensimplies more than 10 minutes at its worst-case rate, andraises a bare, status-less
ValueErrorbefore anything is sent.classify_provider_errorreturnsNonefor a status-less error, so it fallsthrough to the generic 502 with no hint that a client-side limit was hit.
build_attempt_client_args(src/gateway/api/routes/_platform.py) andget_provider_kwargs(src/gateway/services/provider_kwargs.py) now give anAnthropic client an explicit
timeout(the SDK's own default value, so thisonly disables the guard's own-default check rather than changing the wire
timeout for any request the guard already let through) whenever the attempt
carries none, including the hybrid-mode path that sources
client_argsfromextra_params. An operator-configured timeout is left untouched.classify_provider_erroralso gets a defense-in-depth branch: anoperator-supplied timeout equal to the SDK's default can still re-arm the
guard, and it maps that status-less failure to a 400 naming the cause instead
of the generic 502.
PR Type
Relevant issues
Fixes #533
Checklist
tests/unit,tests/integration).make lint,make typecheck,make test).uv run python scripts/generate_openapi.py).AI Usage
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Verification
tests/unit/test_provider_error_classification.py,tests/unit/test_provider_instances.py, andtests/unit/test_hybrid_client_args_routing.py: fail onmain(
6eade8378) with the new symbols missing or the pre-flightValueErrorreaching the transport unmodified, pass on this branch; ran both ways in a
clean
python:3.14container, matching this repo's own CI matrix.test_anthropic_default_timeout_reaches_the_real_sdk_client[_in_hybrid_mode]drive the real
any-llm/Anthropic SDK stack, patching onlyhttpx.AsyncClient.send, so they prove the guard is actually skipped ratherthan only that our own classifier returns the value we expect.
tests/unitsuite (2540 passed, 8 skipped),ruff check,check_architecture.py, andmypy --strictall clean on the branch, samecontainer.
tests/integrationwas not run (needs a PostgresTestcontainer); none of it imports the changed symbols.
exercises the SDK's own client construction and pre-flight guard; no
network credentials were used or needed.
Summary
Anthropic requests with large
max_tokensvalues now avoid premature client-side rejection. Configured timeouts remain unchanged, including in hybrid mode.Status-less timeout guard failures now return an actionable HTTP 400 response instead of a generic 502 error.
Added regression tests and documentation for timeout handling, hybrid routing, error classification, and SDK behavior.