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47300 commits

Author SHA1 Message Date
Moe Khalil
32a5b79d21 feat(deploy): add autorouter sandbox gateway that proxies to the upstream sandbox
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
2026-09-06 03:16:07 +00:00
yuneng-jiang
11a0c0abf0
Merge pull request #39995 from BerriAI/litellm_mongodb_extra_docker_images
fix(docker): ship pymongo in the proxy images for the MongoDB vector store
2026-09-05 20:08:01 -07:00
tin-berri
9fd60e4f95
feat(router): gate heuristic v1 tuning (#39952) 2026-09-05 19:24:00 -07:00
Yuneng Jiang
37e8b99a9f
fix(docker): ship pymongo in the proxy images for the MongoDB vector store
The MongoDB Atlas vector store provider imports pymongo lazily from the
opt-in `mongodb` extra, but none of the shipped images installed that
extra. Any image-based deployment that configured a MongoDB vector store
failed at search time with "requires the 'pymongo' package", which the
user cannot fix without extending the image

Adds `--extra mongodb` to every uv sync in the root Dockerfile,
Dockerfile.database, Dockerfile.non_root, and the gateway component
image. The backend component does not serve /vector_stores so it is left
as is. The extra resolves from the existing uv.lock to pymongo 4.17.0
plus dnspython 2.8.0, no lock change needed

(cherry picked from commit 16fd14f537)
2026-09-05 18:14:58 -07:00
ryan-crabbe-berri
09e9fd5f60
Merge pull request #39991 from BerriAI/litellm_remove_legacy_user_dashboard
refactor(ui): render the Virtual Keys page without the legacy user dashboard
2026-09-05 18:11:12 -07:00
tin-berri
60440ee4d3
feat(mcp): add opt-in per-server oauth relay discovery (#39936)
Resolves LIT-7074
2026-09-05 18:04:35 -07:00
moe-berri
91ae13d07d
Merge pull request #39955 from BerriAI/litellm_fix_adaptive_router_bandit_prior
fix(adaptive_router): add the persisted delta to the cold-start prior on load
2026-09-05 18:02:04 -07:00
moe-berri
aee819c976
Merge pull request #39957 from BerriAI/litellm_fix_adaptive_router_cost_from_model_info
fix(adaptive_router): fall back to model_info for cost-weighted scoring
2026-09-05 18:01:36 -07:00
moe-berri
b7a48b43b3
Merge pull request #39954 from BerriAI/litellm_fix_auto_router_blocking_cold_start
fix(auto_router): build the semantic route layer off the event loop
2026-09-05 18:01:11 -07:00
tin-berri
0315dd6f58
fix(headroom): inject headroom_retrieve only for service-declared ccr_hashes and keep assistant content blocks intact (#39974)
The retrieve tool was injected whenever any hash=<24hex> string appeared in the
restored conversation, including protected rows and caller-authored text, so a
git SHA in a tool result registered a bogus hash and billed a useless retrieval
round trip on every later turn. The compression service reports the hashes it
actually stored in ccr_hashes; that field is now the only source, validated to
the service's own 12 to 24 hex grammar before it reaches the retrieve URL.

Assistant rows are no longer flattened to strings before compression: the
service protects assistant text blocks but has no gate for assistant strings,
so the model's own earlier tables came back as a schema line plus CSV.

Adds ccr_retrieval (default true) so operators on a marker-free sidecar can
turn the retrieval loop off entirely.
2026-09-05 17:58:18 -07:00
ryan-crabbe-berri
8bfaaffba5 test(ui): stub the Virtual Keys dashboard in the expired-token page test 2026-09-05 17:57:38 -07:00
tin-berri
01680d7b42
fix(anthropic): keep provider_specific_fields off the native /v1/messages wire (#39967)
The chat and Responses bridges serialize tool_use blocks with model_dump(), so every
bridged /v1/messages response carried LiteLLM's internal provider_specific_fields key
(null, or a Gemini thought signature). Clients replay the block verbatim, and the next
turn that lands on a native Anthropic deployment (auto-router tier change, model swap)
is rejected with "tool_use.provider_specific_fields: Extra inputs are not permitted"

Strip the key from replayed content blocks at the single native Anthropic dispatch so
already-poisoned transcripts self-heal on every native provider, and stop emitting the
null on new responses. The bridges keep reading the signature for the Gemini round trip

Closes #19739
2026-09-05 17:50:54 -07:00
ryan-crabbe-berri
da705c9475 refactor(ui): render the Virtual Keys page without the legacy user dashboard
The API Keys route mounted the pre-App-Router UserDashboard component,
whose beforeunload handler cleared sessionStorage on every refresh of
the Virtual Keys page. That wiped the Playground chat history and model,
the logs live-tail preference, and everything else other pages keep in
session storage. The same component also re-decoded the login token,
re-fetched teams, and wrote cache entries nothing read.

ApiKeysDashboard now renders VirtualKeysTable and the Create Key button
directly, taking identity and role from useAuthorized like every other
page. Create Key is hidden for view-only roles, which the proxy already
rejects on /key/generate. The legacy component, its test, the fetch_teams
helper, and their grandfathered eslint suppressions are removed, and the
ProxySettings type moves to useProxySettings.
2026-09-05 17:49:29 -07:00
ryan-crabbe-berri
a9f8a8d794
Merge pull request #39978 from BerriAI/litellm_remove_migrated_pages_shim
refactor(ui): route the sidebar by pathname and shrink the ?page= shim to a redirect table
2026-09-05 17:17:34 -07:00
yucheng-berri
6e05ac5d97
feat(guardrails): add inspect_embeddings toggle for AIM and Cato (#39918)
* fix(guardrails): don't inspect embeddings in the AIM and Cato hooks

`pre_call_hook` fires for /embeddings as well as chat. An embeddings body
carries `input` — documents being indexed, not a prompt — which
`build_inspection_messages` lifts into synthetic chat messages, so both hooks
inspect it as a conversation and a policy verdict on that text breaks a request
that was never one:

- AIM, anonymize + batched `input`: `has_non_string_content` is true for any
  list, so `_anonymize_request` raises 400 "...multimodal input...".
- AIM, anonymize + single-string `input`: no error — the input is rewritten to
  redacted text and the caller embeds text it never sent.
- AIM and Cato, block: the embeddings request is blocked outright.

Gate both hooks on a new `NON_CONVERSATIONAL_CALL_TYPES` deny-list. This is
deliberately not `TEXT_CONTENT_CALL_TYPES`: that allow-list omits
`anthropic_messages`, `responses` and `call_mcp_tool`, so gating on it would
stop these guardrails inspecting real chat traffic. An unrecognised or newly
added call type is still inspected.

* feat(guardrails): add inspect_embeddings toggle for AIM and Cato

* fix(guardrails): redact batched embedding input on anonymize

A list of plain strings is the /embeddings batch shape. AIM rejected it as
multimodal and Cato forwarded the original strings, so anonymize never
reached the provider for batched input. Redactions are now written back
element-wise, one redacted message per non-empty element, so a fully
redacted element cannot shift the following documents into the wrong slot.

* fix(guardrails): reject partial embedding redactions

* fix(guardrails): avoid unnecessary batch type check

* style(tests): drop trailing blank line in cato guardrail tests

* fix(guardrails): reject malformed batch redactions

* fix(guardrails): reject malformed batch redactions

* fix(guardrails): reject aim redactions with no text content

The anonymize path read role and content off every entry of the vendor's
redacted_chat before the shared write-back helper could refuse the payload,
so a message missing content, or a bare string in place of a message, raised
out of the hook as a 500. Validate the vendor list first and return the 400
the guardrail already uses for an unusable redaction.

* fix(guardrails): validate all aim redaction paths

Validate AIM redaction containers before request or output rewrites, reject
cardinality mismatches and empty output, and cover malformed vendor payloads
with regression tests.

* fix(guardrails): preserve aim output redaction alignment

AIM returns the inspected request messages followed by the assistant output.
Validate that full response and select the final redacted message instead of
requiring a single entry.

* test(guardrails): cover aim output anonymize alignment and malformed redactions

---------

Co-authored-by: Guy Levi <guy.levi@catonetworks.com>
2026-09-05 17:15:46 -07:00
yucheng-berri
d515a285b1
fix(azure_sentinel): split batches under the 1MB ingestion cap (#39880)
* fix(azure_sentinel): split batches under the 1MB ingestion cap and keep undelivered records queued

Azure Monitor rejects any Logs Ingestion body over 1MB with a 413. The Sentinel logger
posted the whole queue as one body and cleared it in a finally block, so an oversize
batch, a transient 5xx, or a failed token call dropped every queued record, and records
logged while a send was in flight were cleared with it. Both the standard and the audit
queue share the sender.

Move Datadog's proactive size split and 413 halving into a shared helper,
litellm/integrations/batch_utils.send_batch_with_413_split, and route Sentinel through it
with a 1MB size check. A lone record that still 413s is dropped, everything a transient
failure leaves undelivered goes back to the front of its queue, and the retry queue is
capped at max_queue_size so an unreachable workspace cannot grow memory without bound

* fix(azure_sentinel): retry undelivered records on the flush timer only

Requeued records made every later event cross the batch_size threshold, so a
down ingestion endpoint got one full-queue resend per request. Threshold sends
now go through flush_queue, so they take the flush lock instead of racing the
timer, and they stand down while records are awaiting retry.

A record that cannot be serialized raised out of the size probe and killed the
periodic flush task. The probe now runs inside the failure handling, so the
batch is split and only the record that cannot be serialized is dropped.

* fix(azure_sentinel): decide threshold sends under the flush lock

Concurrent callbacks all read logs_awaiting_retry before the first send
finished, so each one resent the whole queue once that send failed. The
flag and the batch_size threshold are now rechecked while holding the
flush lock, and each queue sends only itself instead of going through
flush_queue, which was retrying the other queue too.

* test(azure_sentinel): cover successful threshold waiters

* fix(azure_sentinel): preserve cancelled batches for retry

* fix(azure_sentinel): requeue only the undelivered part of a cancelled split

A batch over the ingestion cap goes out in pieces, so a cancellation partway
through requeued pieces the destination had already accepted and sent them a
second time on the next flush

The split helper now raises a cancellation carrying the records it never
delivered, and Azure Sentinel requeues those instead of the whole batch

* fix(azure_sentinel): drop batches a permanent rejection will never accept

A non-413 4xx from the ingestion endpoint or from the OAuth token call means the request
will fail the same way on every retry, so requeueing it held the batch, and every record
logged behind it, until the queue cap dropped them. Retryable statuses (5xx, 408, 429)
still keep the whole batch, and a shared classifier gives Datadog the same rule

The serialization probe now catches any exception, not just TypeError and ValueError,
because safe_dumps hands pydantic models to model_dump and can raise anything. It also
splits on record count, so a recovery flush sends batch_size records per request instead
of serializing the whole requeued queue to measure it

Both integrations re-raise a cancelled send as exactly asyncio.CancelledError. Python
3.12's asyncio.wait_for only translates the exact class into TimeoutError, so the
BatchSendCancelled subclass escaped the logging worker as an unhandled error

The awaiting-retry flag now follows the queue that survived the max_queue_size trim, so
a deployment with the cap at zero is not left waiting for a timer flush with nothing
queued to retry

* chore(logging): document mutable queue ownership

Annotate the queue detach and requeue constructions required by the logger's appendable queue contract so the type-discipline budget stays clean

* fix(datadog): preserve non-413 retry behavior

Keep Datadog's existing contract of requeuing every non-413 HTTP failure while Azure Sentinel applies its permanent-client-error policy through the shared splitter

* fix(batch_utils): requeue by default and let Sentinel opt into dropping

The shared splitter's default non-success handler is now requeue_after_http_error, the behavior Datadog had before the extraction, so a caller that omits the argument keeps its records. Azure Sentinel passes undelivered_after_http_error explicitly to drop permanent 4xx rejections

Also drops an explicit return None the strict ruff gate flags in the test helper
2026-09-05 17:15:36 -07:00
Mateo Wang
56a61cf016
Merge pull request #39764 from BerriAI/litellm_govcloud_profiles_lit6421
feat(pricing): add GovCloud pricing for every live but unpriced Bedrock model
2026-09-05 17:15:22 -07:00
ryan-crabbe-berri
e1fb8affe3
Merge pull request #36841 from BerriAI/litellm_lite_pi
feat(cli): add lite pi to run the pi coding agent through the proxy
2026-09-05 17:14:11 -07:00
ryan-crabbe-berri
0c45e28dbd test(ui): query sidebar links by role so the testing-library budgets stay under their ceilings 2026-09-05 17:07:27 -07:00
Mateo Wang
0aa346cba5
Merge pull request #39972 from BerriAI/litellm_lit_7027_emulated_file_search_scope
fix(file_search): scope emulated file_search to the request's vector stores
2026-09-05 17:07:04 -07:00
ryan-crabbe-berri
2dfa14648a refactor(ui): drop comments that restate the redirect table and home route 2026-09-05 16:50:20 -07:00
Mateo Wang
02cbff4918
Merge pull request #39964 from BerriAI/litellm_lit_7050_redact_failure_traceback
fix(proxy): redact provider keys from pass-through failure tracebacks
2026-09-05 16:48:04 -07:00
mateo-berri
8bf03c10fd fix(file_search): escape the dropped vector_store_id in the warning
Format the model-picked id with %r so control characters in it cannot
break the log line. The regression test for the unlisted id keeps to
generic scoping wording
2026-09-05 16:44:54 -07:00
ryan-crabbe-berri
1258d84221 refactor(ui): route the sidebar by pathname and shrink the ?page= shim to a redirect table
The sidebar and header were still keyed on legacy ?page= ids and mapped
back and forth through MIGRATED_PAGES, legacyPageHref and
legacyKeyForPathname. Leaves are now plain Next links to their path
route, the active item and breadcrumb come from usePathname, and the
setPage/defaultSelectedKey prop chain is gone.

The id-to-route table moves next to the dashboard root page as its only
consumer. That redirect now forwards the remaining query params instead
of dropping them, so deep links such as the proxy's MCP env-var setup
link (?page=mcp-servers&fill_env_vars=) no longer rely on the target page
reading the pre-redirect URL during its first render. The proxy builds
that link as /ui/mcp-servers?fill_env_vars= directly, and the Playground
warnings link to the real routes instead of relative ?page= URLs.

migratedHref is renamed uiHref, the /ui base-path helper it always was.
2026-09-05 16:44:11 -07:00
yuneng-jiang
bde58f9b41
Merge pull request #39959 from BerriAI/litellm_/release-ui-build-e256a3
chore: rebuild Admin UI bundle for the next release
2026-09-05 16:40:13 -07:00
mateo-berri
55a6132b31 fix(file_search): log when a model-picked vector_store_id is dropped
Emulated file_search now warns when the model returns a vector_store_id that is
not one of the request's stores, naming the dropped id and the stores that were
searched instead. H16 asserts the warning is emitted exactly once.
2026-09-05 16:31:24 -07:00
Yuneng Jiang
0e118342ac
chore: update Next.js build artifacts (2026-09-05 23:25 UTC, node v24.19.0) 2026-09-05 16:25:57 -07:00
yuneng-jiang
b1e2f5bc0b
Merge pull request #39969 from BerriAI/revert-39121-litellm_lazy_sdk_import
revert: perf: lazy-load SDK symbols so import litellm stays under 60 MB RSS (#39121)
2026-09-05 16:22:55 -07:00
devin-ai-integration[bot]
9a5564f00e
fix(ui): read Usage Total Requests tile from gateway request counts (#39963) 2026-09-05 16:20:56 -07:00
mateo-berri
27c55a21d9 test(proxy): type the traceback-recording hook to match CustomLogger
The regression test's recording logger overrode async_post_call_failure_hook
with untyped parameters. It now mirrors the base signature, and the
UserAPIKeyAuth import moves to module level so the annotation resolves.
2026-09-05 16:19:29 -07:00
Yuneng Jiang
eee162b317
fix(lazy_imports): type import_map as Mapping to stay under the LIT001 budget
The revert restored the dict annotation that #39121 had loosened to Mapping,
and the LIT001 ceiling has been ratcheted down since, so the gate rejected the
one reintroduced hit. Annotation only, no behavior change.
2026-09-05 16:12:45 -07:00
mateo-berri
942e6cb3cd fix(file_search): scope emulated file_search to the request's vector stores
The emulated file_search handler searched whatever vector_store_id the
model returned, so a model steered to an id outside the request's
file_search tool reached a store the per-key vector store permission
check never saw. An id outside the request's stores now falls back to
those stores; an id that is one of them still narrows the search to it.
2026-09-05 16:12:43 -07:00
ryan-crabbe-berri
587311d0e4
Merge pull request #39968 from BerriAI/litellm_remove_dead_model_hub_public_dialog
fix(ui): remove unreachable AI Hub dialog that put the session key in a URL
2026-09-05 16:10:15 -07:00
yuneng-jiang
45cf1a7ef1
Revert "perf: lazy-load SDK symbols so import litellm stays under 60 MB RSS (…"
This reverts commit c091dd4608.
2026-09-05 16:07:09 -07:00
ryan-crabbe-berri
79a5614c18 fix(ui): remove unreachable AI Hub dialog that put the session key in a URL
The Public Model Hub dialog in ModelHubTable was never opened (its open setter had no callers), but its See Page button navigated to /model_hub_table?key=<session key>. Delete the dialog, its state, the handler and the unused router import so the path cannot be revived.
2026-09-05 16:04:50 -07:00
yuneng-jiang
1b25132863
Merge pull request #39953 from BerriAI/litellm_/litellm-e2e-flaky-test-2159ae
test(e2e): judge /v1/messages streaming on the clock, not on the provider's delta count
2026-09-05 16:04:45 -07:00
mateo-berri
4ec5a6761c fix(proxy): redact provider keys from pass-through failure tracebacks
A failed pass-through call logged the httpx traceback, whose message
quotes the upstream URL with the provider API key in its query string,
into the spend log's error information and into every failure callback.
The error information built for logging now redacts its traceback and
error message, and the traceback is redacted once before the failure
callbacks receive it.
2026-09-05 15:58:33 -07:00
ryan-crabbe-berri
a0c9095cfc
Merge pull request #39960 from BerriAI/litellm_cache_hit_guardrail_spend
fix(proxy): keep guardrail cost in spend on cache hits
2026-09-05 15:53:34 -07:00
ryan-crabbe-berri
63156a7bd6 test(proxy): explain the proxy_server patches in the cache-hit regression test
The test-quality gate counts every patch of a litellm internal against a ceiling, and the three patches this test needs pushed it over. The callback imports increment_spend_counters, update_cache and proxy_logging_obj from proxy_server inside its own body, so there is no seam to inject fakes through; every other test in this file uses the same three patches for the same reason

Claude-Session: https://claude.ai/code/session_01EX13mWex6RaBo9PYnkAtFW
2026-09-05 15:44:37 -07:00
moe-berri
515d1c8650 address review: trim remaining comment verbosity 2026-09-05 15:43:03 -07:00
moe-berri
72da45d951 address review: clear a failed build via a done-callback, not the waiter
The previous cleanup only ran inside a caller's own except handler, so a
build that failed after its only caller had already been cancelled left
the failed task cached with nothing left to clear it. Move the cleanup
onto the task itself as a done-callback, which fires whether or not
anyone is still awaiting it, so the next request always gets a fresh
attempt instead of replaying the stale failure.

Adds a regression test for exactly that ordering (cancel the only
caller, let the build fail unobserved, then confirm the next request
builds successfully); it fails against the previous except-based
cleanup, which left the task cached.
2026-09-05 15:38:03 -07:00
moe-berri
1d86efde9c address review: trim verbose comments, fix wrong-request-type assertion
test_load_state_from_db_handles_unknown_request_type compared the
WRITING cell after load against a cold-start value captured for
GENERAL. They happened to be equal for this fixture (the fast model's
empty strengths list makes every request type's prior identical), which
hid that the assertion was comparing the wrong baseline. Capture each
request type's own cold-start value instead.
2026-09-05 15:32:48 -07:00
ryan-crabbe-berri
acddd21860 fix(proxy): keep guardrail cost in spend on cache hits
The proxy cost callback zeroed response_cost whenever cache_hit was true. That rule dates from Jan 2024 when it was the only place cache hits were priced. The logging layer has priced the LLM share at 0 on a cache hit since Aug 2024, and since guardrail cost joined the standard logging payload the proxy-side zeroing has thrown away a real provider charge: a pre_call guardrail runs before the cache is consulted, so a cached response still cost whatever the guardrail billed. Drop the redundant zeroing so the payload's response_cost, which is already LLM 0 + guardrail cost, reaches spend logs, daily tables and budgets untouched

Claude-Session: https://claude.ai/code/session_01EX13mWex6RaBo9PYnkAtFW
2026-09-05 15:32:02 -07:00
moe-berri
ba9bad4314 address review: close a cancellation race, stop monkeypatching in tests
_ensure_routelayer previously awaited asyncio.to_thread(...) directly
inside the lock. Under cancel_on_disconnect, cancelling that await
released the lock while the worker thread kept running, so a second
concurrent request would see no lock held and start a duplicate billed
build. Store the build as a task on self and have every caller await it
through asyncio.shield: cancelling one caller's wait no longer cancels
the build or lets another caller start a second one. A real build
failure (not merely a cancelled caller) clears the slot so the next
call retries fresh instead of replaying the same failure forever.

Also replaces the two tests that monkeypatched _build_routelayer (an
anti-pattern per this repo's conventions) with ones that instrument the
already-injected embedding router dependency instead, and adds a third
proving the cancellation race is actually closed.
2026-09-05 15:30:15 -07:00
moe-berri
afc604d1da address review: trim comments, add behavioral pick_model regression tests
- Shrink the fallback comments to one line each; the fuller rationale
  was redundant per repo comment policy.
- Add test_pick_model_favors_the_cheaper_model_info_priced_deployment
  and its hybrid-router counterpart, which exercise pick_model's actual
  Thompson-sampling/scoring output instead of only asserting the
  model_to_cost dict. Both are ordered so the expensive model wins
  pick_best's insertion-order tie-break on the pre-fix code (proven by
  reverting the production diff and rerunning), so they fail before the
  fix and pass after it.
2026-09-05 15:25:06 -07:00
Mateo Wang
bf51dea36b
Merge pull request #39862 from BerriAI/litellm_lit_6992_cohere_parse
feat(ocr): add Cohere Parse support for cohere and azure_ai
2026-09-05 15:16:16 -07:00
moe-berri
a00b60933c fix(adaptive_router): fall back to model_info for cost-weighted scoring
Both places that build an adaptive router's model_to_cost (the plain
auto_router/adaptive_router path in router.py, and the hybrid
adaptive-inside-complexity_router path in complexity_router.py) read
input_cost_per_token from litellm_params only. Custom pricing is
conventionally declared under model_info everywhere else in LiteLLM
(cost_calculator.py, add_deployment's litellm.model_cost registration),
so a deployment priced that way silently costs 0.0 in adaptive-router
scoring: every candidate ties on cost, the cost term contributes
nothing, and routing runs on quality alone with no warning.

Fall back to model_info at both call sites when litellm_params does not
declare a cost, matching how quality_router.py already sources cost.
litellm_params still wins when both are set.

Fixes #31481.
2026-09-05 15:15:07 -07:00
yuneng-jiang
6a4fb2bbe8
Merge pull request #39938 from BerriAI/litellm_e2e_vertex_cache_first_call
test(e2e): prove Vertex context caching on the first cold call and on the spend row
2026-09-05 15:10:15 -07:00
moe-berri
2d48c6ae82 fix(adaptive_router): add the persisted delta to the cold-start prior on load
load_state_from_db assigned a DB row's (alpha, beta) straight into the
bandit cell, discarding the cold-start prior _init_cold_start_cells had
already put there. AdaptiveRouterUpdateQueue.flush_state_to_db only ever
persists accumulated deltas (its upsert creates a row with the raw delta
as the initial value, then increments it), never a full posterior, so a
cell whose first flush sees only one kind of signal persists a one-sided
row: e.g. alpha=1.0, beta=0.0. Loading that row as the whole cell hands
thompson_sample() a Beta(alpha, 0), and random.betavariate raises
'gammavariate: alpha and beta must be > 0.0' on every draw from that
cell from then on, surviving restarts since the bad row stays in place.

Fix: add the row on top of a freshly computed prior instead of replacing
the cell with it. Deltas are never negative, so both parameters stay
positive.

Fixes #35590. Fixes #29397.
2026-09-05 15:09:45 -07:00
moe-berri
5fc769c0a1 fix(auto_router): build the semantic route layer off the event loop
AutoRouter's cold-start route layer construction (SemanticRouter with
auto_sync="local") ran directly on the event loop, doing at least one
synchronous embedding HTTP call inline behind a bare "if routelayer is
None" check with no lock, so it blocked the whole worker and let
concurrent cold-start requests each build a duplicate layer.

ComplexityRouter already solved this identically for its own semantic
keyword matching (_ensure_semantic_routelayer: a lock plus
asyncio.to_thread). Give AutoRouter the same treatment: extract the
build into _build_routelayer and gate it behind _ensure_routelayer's
double-checked async lock.

Fixes #33204.
2026-09-05 15:03:05 -07:00