fix(trtllm): stop a configured --context-length being silently discarded

[glamr-agent]

Overview:

The TensorRT-LLM sidecar accepts a --context-length argument (also settable as TRTLLM_CONTEXT_LENGTH), but threw it away at startup whenever GetModelInfo reported any positive value. Some TensorRT-LLM releases fill GetModelInfoResponse.max_seq_len with the maximum input length rather than the real maximum sequence length, so an operator who configured 4096 silently ran with 1024. A request that omits max_tokens derives its default from that number, floored at 1, so a longer prompt came back as a single token — and the same wrong number was registered with the frontend.

Details:

TrtllmSidecarEngine::start now resolves the engine report into a local value and decides afterwards, instead of assigning inside the match arm. A supplied --context-length wins; the engine report is adopted only when the argument is omitted; when the two disagree, a WARN names both numbers and says which takes effect. Equal values log nothing. When the RPC fails outright there is no report to weigh, so the sidecar keeps whatever the argument supplied and the WARN names that value — or, when no argument was supplied, says plainly that no context length is available rather than implying one is in use. Startup is never refused and no value is clamped.

The --help text in args.rs and launch/agg.sh now states that precedence.

Where should the reviewer start?

lib/sidecar/trtllm/src/engine.rs — the precedence block in start. Then configured_context_length_overrides_the_engine_report in lib/sidecar/trtllm/src/tests.rs: it drives the engine against the crate's in-process fake gRPC server, which reports 4096, with 8192 configured, and asserts both the registered context length (8192) and the max_tokens on the request the server actually received (8189).

Validation

cargo test -p dynamo-trtllm-sidecar passes (20 tests), and cargo fmt --all -- --check, cargo check --workspace --all-targets and cargo clippy -p dynamo-trtllm-sidecar --all-targets -- -D warnings are clean. The new test was also run against the unmodified code, where it failed on both assertions.

Related Issues

🚫 This PR is NOT linked to an issue:

• Confirmed — no related issue

Summary by CodeRabbit

• New Features

  • Explicit context-length settings now take precedence over the value reported by TensorRT-LLM.
  • When configured and reported values differ, a warning is logged.
  • Reported context length remains the fallback when no explicit setting is provided.

• Bug Fixes

  • Default maximum token calculations now use the configured context length when available.

• Documentation

  • Updated help and configuration documentation to clarify context-length precedence and fallback behavior.

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[glamr-agent]

review.md

🤖 Automated AI review — advisory. An AI agent's judgment of
whether this change is logically sound based on the code and reported
validation results. This is not an approval. Repository CI and human
reviewers decide whether to merge.

Review — TensorRT-LLM sidecar: an explicit --context-length is authoritative

I read the change in the checkout at commit 643c0623f and reasoned about the code
directly rather than restating the author's or the validator's account of it. Where I lean
on a reported result below, I say so and say why I find it credible.

What the change does

TrtllmSidecarEngine::start in lib/sidecar/trtllm/src/engine.rs used to assign the
GetModelInfo-reported context length into model.context_length from inside the match
arm, unguarded by whether the operator had supplied --context-length. It now resolves the
engine report into a local first and decides afterwards:

let reported = match client.model_info().await {
    Ok(reported) => reported,
    Err(error) => {
        tracing::warn!(%error, "GetModelInfo failed; using --context-length");
        None
    }
};
match (model.context_length, reported) {
    (Some(configured), Some(reported)) if configured != reported => tracing::warn!(
        configured_context_length = configured,
        engine_context_length = reported,
        "--context-length disagrees with the context length TensorRT-LLM reported; \
         using the configured --context-length"
    ),
    (None, Some(reported)) => model.context_length = Some(reported),
    _ => {}
}

The match covers every case, and the OnceCell follows it

I walked all six reachable states of (model.context_length, reported). The value that
reaches self.context_length.set(...) at engine.rs:166-168 is whatever model.context_length
holds after the block, so each row below is the resolved value for both the default-max_tokens
path and the registration.

model.context_length	reported	Arm taken	Resolved value	WARN
Some(c)	Some(r), c != r	first arm (guard true)	Some(c) — configured	yes, the new one
Some(c)	Some(r), c == r	guard fails, falls through to _	Some(c) — identical to r	no
None	Some(r)	(None, Some(reported))	Some(r) — adopted, as before	no
Some(c)	None (engine reported 0)	_	Some(c)	no
None	None	_	None, OnceCell left unset	no
any	Err from the RPC	reported is None; then rows 4 or 5	unchanged from before	the pre-existing RPC warning only

Two details are worth stating because they are easy to get wrong in this shape and the
change gets both right. First, a failed match guard in Rust falls through to the following
arms rather than to the arm body, so the equal-values case really does reach _ => {}
and really does emit no warning — an operator who configures the same number the engine
reports gets no new log noise. Second, an unrepresentable or non-positive max_seq_len
never reaches this block as Some: client.rs:73 is
Ok(u32::try_from(info.max_seq_len).ok().filter(|len| *len > 0)), so "the engine reported
nothing" and "the engine reported zero" are already the same case, and the new code needs no
extra guard for it. The error branch is behaviourally identical to the old error arm — it
warns and assigns nothing — so the only behaviour that changed is row 1.

An authoritative configured value can never be 0, because from_parsed rejects it at
engine.rs:80-84 with context-length must be greater than zero.

The stated intent is satisfied, including the environment-variable spelling

args.rs:27 is #[arg(long, env = "TRTLLM_CONTEXT_LENGTH")] over
pub context_length: Option<u32>. Clap fills that one Option from either the flag or the
environment variable and gives the callee no way to distinguish them, so Some(_) means
"the operator expressed a value" under both spellings and the new precedence applies to both.
There is no separate code path that could treat the environment variable differently. The
WARN message names the flag rather than the variable, which is the right canonical name
for a message that has to pick one.

The three properties asked for are each present: configured wins (row 1), the engine value is
adopted only when the argument is absent (row 3), and a genuine disagreement produces a WARN
carrying both numbers as structured fields plus a sentence saying which one takes effect.
Startup is not refused and neither value is clamped or minimised, which keeps the change
conservative.

The second consequence is fixed, not just the max_tokens symptom

Both consequences flow from the single local model. engine.rs:166-168 sets the
context_length OnceCell that generate passes to build_generate_request at
engine.rs:193, and engine.rs:179 returns model.engine_config(), which is what puts
context_length into LlmRegistration at model.rs:30-35. Both read the same variable
after the same block, so they cannot diverge, and correcting the block corrects both. The
new test asserts each of them separately, which is the right way to demonstrate it.

Equally important is what was not done: convert::max_tokens is untouched. Clamping the
derived value there would have hidden the one-token response while still publishing the wrong
number to the frontend. The two existing derivation tests
(omitted_max_tokens_defaults_to_remaining_context, omitted_max_tokens_default_is_floored_at_one)
are unmodified.

The new test discriminates; it is not tautological

configured_context_length_overrides_the_engine_report at lib/sidecar/trtllm/src/tests.rs:645-668
stands up the crate's in-process fake trtllm.TrtllmService, whose get_model_info returns
max_seq_len: 4096 (tests.rs:144-154), builds the engine with a configured 8192, calls
start, then issues one generation with stop_conditions.max_tokens set to None.

I applied the revert test: with the production change reverted, start would assign
Some(4096), so tests.rs:652 fails, and the OnceCell would carry 4096, so
convert::max_tokens would derive 4096 - 3 = 4093 and tests.rs:667 fails. Neither
assertion can pass against the unmodified code.

The second assertion is the stronger one and it does what the change description claims. It
reads sent.max_tokens off the GenerateRequest the fake server actually recorded, reached
through generate → build_generate_request → convert::max_tokens — the real request the
engine would have received, which is where the truncated response came from — rather than
reading back the EngineConfig field the diff had just written. The 3 in 8192 - 3 = 8189
is the token_ids(vec![11, 22, 33]) in the shared request() helper at tests.rs:215-218,
so the arithmetic is real and not a restatement of a constant.

I did not re-run the suite. I did check the reported evidence against the file, and it holds
up: the reported pre-fix failure quotes a panic at tests.rs:652 with left: Some(4096),
right: Some(8192), and 652 is exactly the line of the first assertion in the committed
tree. A second reported run, with the first assertion neutralised so it could not shadow the
second, panics with left: 4093, right: 8189. 4093 is the value the derivation produces
from the engine's 4096, which is only reachable if the engine value really did win. Running
the test once against the original behaviour before recording the passing run is the right
discipline, and doing it twice so the second assertion is shown to discriminate independently
is more than the minimum.

The helper refactor is behaviour-preserving: engine(endpoint, connections) at tests.rs:258-260
now delegates to engine_with_context_length(endpoint, connections, None), and None is
exactly the literal the old body passed. No existing call site's arguments or behaviour moved.

The negative control is genuinely unmodified

aggregated_generation_streams_delta_then_terminal at tests.rs:614-643 is untouched by the
diff — the only hunk in that region is a pure addition after the test's closing brace. It still
calls engine(&server.endpoint, 2) with no configured context length and still asserts
config.llm.unwrap().context_length == Some(4096), the engine's report. That is the
omitted-argument branch (row 3 above), and its passing is what shows the change narrowed the
adoption rule rather than inverting it. The reported run lists it as ok alongside the new
test in the same 20-test green run.

Documentation matches the code, and nothing else in the tree contradicts it

I swept the repository for every place that describes this argument, not only the ones the
diff touches:

• args.rs:19-26 — the clap --help text now states the precedence, that the report is used
  only when the argument is omitted, and that a disagreement is logged at WARN. Accurate.
• launch/agg.sh:42 — now reads Model context length; overrides what the engine reports (default: 4096). Accurate for this launcher, which always passes the flag.
• model.rs:13-15 — the ConfiguredModel::context_length doc comment now orders the two
  sources. Accurate.
• engine.rs:142-147 — the block comment previously documented the opposite precedence and
  had to be rewritten; it was, and the new text is correct.
• engine.rs:36-38 — the context_length field doc already read
  "--context-length, else GetModelInfo". That ordering was wrong before this change and
  is right now. No edit needed; worth noting because it is the kind of pre-existing comment a
  precedence change usually falsifies, and here it does the opposite.
• deploy/agg.yaml:118-123 — the example's comment says the engine reports 0 and the value
  must be set here. Still true, correctly left alone.
• lib/sidecar/trtllm/README.md, lib/sidecar/README.md, and the four docs-site pages that
  mention dynamo-trtllm-sidecar — none of them mentions the context-length argument at all,
  so none of them can now be contradicting the code.
• convert.rs:85-86 is the one remaining stale sentence. See finding 1.

Scope and repository conventions

The diff is five files, all under lib/sidecar/trtllm/, +66 / -13. It matches the plan's
scope: no change to convert::max_tokens, no change to client::model_info, no new flag, no
new crate dependency, no touch to the vLLM or SGLang sidecars or the in-process Python
TensorRT-LLM backend. No generated artifact is edited — CODEOWNERS and the generated docs
are untouched, and no new directory is added that would need an ownership entry. The single
commit carries a Conventional Commit subject, fix(trtllm): honor an explicit --context-length over GetModelInfo, and a Signed-off-by: trailer matching the author. I searched the working
tree for the internal ticket identifier and found no occurrence, in the tree or the commit
message. The packet's change.diff is byte-identical to git show 643c0623f.

The two gaps the validation flagged

No shell linter. I confirmed this independently: .pre-commit-config.yaml contains no
shellcheck, shfmt, or bashate entry, and nothing under .github/ references
shellcheck. So the statement is a fact about the repository rather than an omission in this
change. It carries close to no risk here, because the edit replaces one string literal inside
an existing echo and introduces no new quoting, expansion, or control flow. bash -n lib/sidecar/trtllm/launch/agg.sh exits 0. There is nothing for the author to do about it.

No test asserts the WARN. I agree this should not block, and I would put it slightly
more strongly than the validation does. The warning arm is not merely "surrounded" by tested
code — the new test hits that exact arm, since 8192 != 4096, and its behavioural
consequence, that model.context_length is left alone, is what both assertions verify. What
is untested is only the message text and the fact that a line was emitted. No code parses that
message, so an assertion over it would pin prose: it would fail when somebody improves the
wording and at no other time, and it would cost a tracing capture dev-dependency the crate
does not have to buy that. Leaving it out is the better call, and the change description says
so explicitly rather than quietly.

Findings

#	Location	Severity	Claim	Evidence
1	lib/sidecar/trtllm/src/convert.rs:86	nit	The comment still asserts GetModelInfo returns zero on current releases, which is the belief this change exists to correct.	The same change updates args.rs:23-24 to say releases report "nothing usable (zero) or the maximum input length" and engine.rs:144-145 to say some releases report max_input_len. convert.rs:86 is the fourth site describing the same upstream behaviour and is the only one left carrying the incomplete version. Nothing depends on it, so this is a one-clause tidy-up, not a defect.
2	lib/sidecar/trtllm/launch/agg.sh:103	nit	Because the launcher always passes --context-length "$TRTLLM_CONTEXT_LENGTH" with the default 4096 from line 65, a user of this launcher can no longer take an engine-reported context length at all.	Under the previous precedence, a future TensorRT-LLM release that reports a model's real max_seq_len (for example 40960 for the launcher's default Qwen/Qwen3-0.6B) would have won over the launcher's 4096; under the new precedence it loses to it and only a WARN records the fact. Nothing regresses today — the installed release reports 0, as deploy/agg.yaml:120 and convert.rs:86 both record, so 4096 is already the effective value — and the new help text at agg.sh:42 states the override honestly. Passing the flag only when TRTLLM_CONTEXT_LENGTH was explicitly set would keep the opt-out, but that is a judgment call for the maintainer, not a defect in this diff.

Neither finding is blocking. Both are optional follow-ups; the change is correct without them.

Summary

The fix is at the cause, not the symptom. The precedence logic is exhaustive and correct in
every state I could construct, including the two the caller singled out — the equal-values
case, which correctly emits nothing, and the GetModelInfo error case, which is byte-for-byte
the previous behaviour. The environment-variable spelling is covered because clap folds it
into the same Option. The regression test exercises the real engine against the crate's fake
gRPC server and fails on the unmodified code through the request the server records, which is
the observable the reported bug was made of; it is not a read-back of a field the diff set.
The omitted-argument branch is untouched and still green. The documentation edits are accurate
and I found no other text in the repository that now contradicts the code. The diff is
focused, signed off, and free of internal identifiers.

Assessment: sound

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📥 Commits

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📒 Files selected for processing (5)

• lib/sidecar/trtllm/launch/agg.sh
• lib/sidecar/trtllm/src/args.rs
• lib/sidecar/trtllm/src/engine.rs
• lib/sidecar/trtllm/src/model.rs
• lib/sidecar/trtllm/src/tests.rs

Walkthrough

The TRTLLM sidecar now prioritizes explicitly configured context length values over TensorRT-LLM reports. It logs mismatches, preserves fallback behavior, updates documentation, and adds integration coverage for default max_tokens calculation.

Changes

TRTLLM context length resolution

Layer / File(s)	Summary
Context length precedence contract lib/sidecar/trtllm/launch/agg.sh, lib/sidecar/trtllm/src/args.rs, lib/sidecar/trtllm/src/model.rs	Documentation defines configured context length precedence, mismatch warnings, and server-report fallback behavior.
Engine context length resolution lib/sidecar/trtllm/src/engine.rs	start uses the configured value when present, warns on differences, and uses the reported value when configuration is absent.
Context length integration coverage lib/sidecar/trtllm/src/tests.rs	Test helpers accept an optional configured value. An integration test verifies that 8192 overrides the reported 4096 and sets the default request limit to 8189 tokens.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to db95b

When model-info lookup fails without a configured context length, startup can report a fallback that is not available, making configuration failures harder to diagnose. This is a bounded observability issue but should be corrected before relying on the warning.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the primary fix: preventing a configured --context-length from being discarded.
Description check	✅ Passed	The description includes the required Overview, Details, reviewer-start location, Related Issues section, and validation results. It clearly explains the problem, implementation, test coverage, and no…

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Actionable comments posted: 1

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Inline comments:
In `@lib/sidecar/trtllm/src/engine.rs`:
- Line 148: Update the GetModelInfo failure handling around the fallback warning
to distinguish configured and missing context length: mention the configured
fallback only when a value exists, and otherwise log that no context length is
available. Preserve the existing error context and avoid claiming that
--context-length is used when unset.

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📒 Files selected for processing (5)

• lib/sidecar/trtllm/launch/agg.sh
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• lib/sidecar/trtllm/src/engine.rs
• lib/sidecar/trtllm/src/model.rs
• lib/sidecar/trtllm/src/tests.rs

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[glamr-agent]

Continuous integration passed: every check scheduled on head 4c5e0e39550a06a72e38004f0c130984ec2d76f6 reached a successful terminal state, with none failing and none left pending. The workflows that run on NVIDIA's own runners have not been scheduled yet, because this pull request comes from a fork and that gate opens only after a maintainer comments /ok to test 4c5e0e3955 with the current short SHA. Merging also still awaits review approval. No other action is needed to advance CI.

[glamr-agent]

Round 1 addressed both open review findings in commit 4c5e0e3.

• lib/sidecar/trtllm/src/engine.rs — the GetModelInfo failure path claimed the configured --context-length was in use even when none had been configured. It now branches on model.context_length: it logs the configured value when one exists, and otherwise states that no context length is available.
• lib/sidecar/trtllm/src/tests.rs — removed the doc comment on engine_with_context_length, which restated the helper name and its parameter without recording a constraint.

Checks run on the new head:

cargo fmt --all -- --check
cargo check --workspace --all-targets
cargo clippy -p dynamo-trtllm-sidecar --all-targets -- -D warnings
cargo test -p dynamo-trtllm-sidecar
pre-commit run --files lib/sidecar/trtllm/src/engine.rs lib/sidecar/trtllm/src/tests.rs

All clean; cargo test -p dynamo-trtllm-sidecar reports 20 passed, 0 failed.

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[tanmayv25]

Precedence logic is correct — all four (configured, reported) combinations and the RPC-error path resolve right, and the new test asserts both the registration and the derived max_tokens.

Two things that don't fit on a changed line:

The description misdiagnoses the cause. Not "some releases" — grpc_servicer.py has answered max_seq_len with args.max_seq_len or args.max_input_len since the gRPC server's first commit (dbad94715, v1.3.0rc2+, unchanged through main). max_seq_len defaults to None and is never written back to llm.args on the PyTorch path; max_input_len defaults to 1024 and a validator forces it back. So every default PyTorch deployment reports 1024, unrelated to the model.

convert.rs:86-91 is wrong (can't comment inline, file unchanged). "GetModelInfo returns zero on current releases" is false given that or. And its removal plan — drop --context-length when TensorRT-LLM#16549 lands — would regress registration: the argument also feeds LlmRegistration.context_length (model.rs:31), which this fallback does not govern.

[dagil-nvidia]

/ok to test 4c5e0e3

[tanmayv25]

Pushed 549649e4..0fcd0807: the review comments, plus a regression this PR introduces.

The regression. launch/agg.sh hardcoded TRTLLM_CONTEXT_LENGTH=4096 and always passed --context-length to the sidecar while passing nothing to trtllm-serve. Once a configured value wins over the report, agg.sh --max_seq_len 2048 builds a 2048-token engine and registers 4096, so the frontend accepts prompts the engine cannot serve. Before this PR the report won and was right.

b41c94df1a passes the context length to both sides and stands down when the caller supplies --max_seq_len:

Invocation	Engine	Sidecar
agg.sh	--max_seq_len 4096	--context-length 4096
agg.sh --max_seq_len 2048	2048	none, adopts the report
TRTLLM_CONTEXT_LENGTH=8192 agg.sh	--max_seq_len 8192	--context-length 8192
TRTLLM_CONTEXT_LENGTH=8192 agg.sh --max_seq_len 2048	2048	8192, warning fires

Side effect: the default case now has both sides on one number, so this PR's disagreement warning stops firing on every ordinary run. It previously fired every time, comparing the script's 4096 against the engine's substituted 1024.

Why 549649e404 discards the report rather than warning. GetModelInfo answers max_seq_len with args.max_seq_len or args.max_input_len, and max_seq_len == max_input_len is that fallback's signature. It matters more than a bad default max_tokens: effective_context_length prefers the registered value over architectural_max_context_length (lib/llm/src/model_card.rs:1023-1027), feeding validate_token_count (lib/llm/src/preprocessor.rs:1996-2000), so registering 1024 makes the frontend reject every prompt over 1024 tokens while shadowing the correct value. Treating the report as absent leaves the architectural value in place.

cargo test -p dynamo-trtllm-sidecar 22 passed, clippy/fmt/cargo check --workspace --all-targets clean.

Net: the two failing checks are pre-existing. deploy/inference-gateway/sidecar became a workspace member in 19377cdf9e (#13669) without the matching COPY in lib/sidecar/Dockerfile; 4a205cb356 (#14151) added it on 09-09. This branch points at 09-07, between the two. Merging main fixes the build.

[tanmayv25]

/ok to test 0fcd080

[yunzhoul-nv]

/ok to test fcac2e6