* test: drop the cwd-relative sys.path.insert calls from the test suite
TQ003 stands at 1,077 across 1,058 files, and 1,015 of them are the same shape:
sys.path.insert(0, os.path.abspath("../..")) and its deeper siblings. The
argument resolves against the working directory rather than the file, so from
the repo root, where every job runs pytest, it inserts the directory two levels
above the checkout. It has never pointed at litellm. The package is installed
into the environment anyway, which is what actually makes the import work, and
what the rule's message has said all along.
Removing them leaves 1,634 imports of sys and os with no remaining reference,
and those go too, except where another test module imports the name back out of
the file. The rest of TQ003 is 62 call sites that resolve against __file__ or a
variable, which are a different question and are left alone.
Collection is identical either way: 45,871 tests and the same 51 pre-existing
collection errors before and after, and ruff reports no new undefined name.
* test: drop the duplicate imports the sys.path sweep exposed to F811
* test(pre-call-utils): restore the os import the new bedrock tests need
* fix(auto-router): stop the embedding model's context window from failing long requests
The auto-router embeds the last user message to pick a model and sent it to the
embedding model unbounded. Embedding models carry 512 to 8k token windows while the
chat models they route to carry 200k+, so any prompt over the encoder's window failed
at the routing step with a 400 the destination model would never have raised.
Cut every doc to a character cap inside LiteLLMRouterEncoder, which is the one choke
point the auto-router, complexity-router, semantic guard and MCP tool filter all share.
Default 2000 chars, roughly 500 tokens, which fits even a 512-token self-hosted encoder,
overridable per deployment with auto_router_max_input_chars and globally with
DEFAULT_MAX_EMBEDDING_INPUT_CHARS.
Truncation alone cannot cover provider-side batch and byte limits, so any failure of
the route call now falls back to the auto-router's default model instead of propagating.
That path also fixes two latent bugs: a no-match left the auto-router alias in place as
the model name, which fails downstream with "Unmapped LLM provider" rather than reaching
default_model, and an empty route list raised IndexError.
Fixes#17869Fixes#20277
* fix(auto-router): make the embedding input cap opt-in so guards still see whole prompts
Defaulting the cap inside the shared encoder truncated every consumer, not just the
auto-router. The semantic guard builds the same encoder, so its pre-call check would
have classified only the first 2000 characters while the full message still reached the
model, which a benign opener in front of an injection payload walks straight past. The
MCP tool filter and complexity router were silently narrowed the same way.
The encoder now defaults to sending docs whole and cuts only when a caller passes
max_input_chars. The auto-router is the only caller that does, so guard, MCP filter and
complexity-router behaviour is unchanged from before this branch.
DEFAULT_MAX_EMBEDDING_INPUT_CHARS becomes DEFAULT_AUTO_ROUTER_MAX_INPUT_CHARS, since it
is now specific to the auto-router, and drops its env override: the per-deployment
auto_router_max_input_chars already covers it, and every env var in constants.py has to
be documented, which is what broke the documentation and code-quality checks.
Also drops the added comments and the redundant type: ignore that review flagged.
* test(auto-router): cover the max_input_chars wiring from litellm_params
Nothing asserted that auto_router_max_input_chars on the deployment reaches the
AutoRouter that embeds prompts. Dropping the wiring left every test green while the cap
silently reverted to the default, so an operator with a 512-token embedding model could
not lower it and every long prompt would fall back to the default model instead of
being routed.
* test(auto-router): cover the populated route-choice list branch
The route layer can hand back a list, and picking its first element is where the
IndexError lived: the empty case was covered but the populated one was not, so the
branch that reads route_choice[0].name could be deleted with every test still green.
