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fix(routing): resolve capability evidence the way the resolver resolves it - #2100

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fix(routing): resolve capability evidence the way the resolver resolves it#2100
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@ntdatt812 ntdatt812 commented Aug 19, 2026

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Summary

candidateCapabilityEvidence describes what the resolver will do with a candidate, and routing acts on it. It read three per-model maps with bare lookups:

const rawContextWindow = provider?.modelContextWindows?.[modelId] ?? provider?.contextWindow ?? ...
const modalities       = provider?.modelInputModalities?.[modelId] ?? ...
const reasoningEfforts = provider?.modelReasoningEfforts?.[modelId] ?? ...

Every runtime reader of those maps goes through modelRecordValue, which accepts a family entry for a tagged id — src/reasoning-effort.ts:108, src/server/effort-policy.ts:122, src/vision/index.ts:34, src/codex/catalog/provider-fetch.ts:612.

Why it bites

{
  "contextWindow": 8000,
  "modelContextWindows":   { "gpt-oss": 131072 },
  "modelInputModalities":  { "gpt-oss": ["text"] },
  "modelReasoningEfforts": { "gpt-oss": ["low", "high"] }
}

Measured on this branch's parent, for gpt-oss:120b:

runtime    window 131072 · isModelTextOnly true · efforts ["low","high"]
evidence   {"contextWindow":8000,"tools":true,"serviceTier":"unsupported",...}

The window is the serious one. It did not degrade to unknown — it fell through to the provider-wide contextWindow, so routing weighed the candidate with a definite value belonging to a different model. That is the failure mode this module's own contract is written against:

"Unknown is not zero": any dimension without canonical evidence stays undefined (unknown) and the profile's unknownEvidence policy decides how that affects eligibility.

image and reasoningEfforts merely went absent, which at least reads honestly as unknown.

There is a second, smaller thing the same change fixes: a bare lookup answers for prototype-shaped ids, so a model named constructor resolved Object.prototype.constructor as its evidence. modelRecordValue uses hasOwnProperty, so it now resolves nothing.

After the change the evidence is {"contextWindow":131072,"image":false,"reasoningEfforts":["low","high"],...} — matching the runtime on all three.

Verification

Eight tests in a new tests/routing-capability-model-matching.test.ts. Reverting only the src change gives 5 fail / 3 pass:

(fail) a family entry covers its tagged siblings, as the resolver does
(fail) the window does not fall through to the provider-wide value
(fail) a registry entry covers its tagged siblings with no provider configured
(fail) noVisionModels beats an exact modality entry, as isModelTextOnly does
(fail) a prototype-shaped model id resolves nothing

The three that pass on the old code are deliberate and are not evidence of the defect: exact-entry-beats-family, unrelated-model-still-falls-back, and a-model-outside-noVisionModels-keeps-its-image-modality. Each guards the fix from over-reaching in one direction.

Two tests assert ground truth before asserting evidence — modelRecordValue(...) and isModelTextOnly(...) are pinned first, so the file is tied to the resolver's own answer rather than to a second copy of the rule.

Blast radius, run locally on the rebased branch:

routing-capability-model-matching · routing-capability-catalog · route-explainability
service-tier-capability · fastwire-characterization-routing
routing-compatibility-model-matching · catalog-vision-sidecar-modalities
routing-policy-fallback
-> 93 pass, 0 fail

Full bun run test: one unrelated failure, CL-03 ... preserves the output byte ceiling as output_byte_limit in tests/lab-live-pinned-timeouts.test.ts. It passes 3/3 in isolation. That file's default firstByteTimeoutMs is 30 ms, so under full-suite CPU contention the first-byte timeout fires before 16 bytes accumulate — a timing race. The file imports only lib/lab-live-pinned-sender, nothing this PR touches. Flagging it rather than quietly calling the run green.

bun run typecheck — exit 0.

Related: same divergence class as #2042, #2059 and #2086, on the routing-evidence surface.

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Summary by CodeRabbit

  • Bug Fixes
    • Improved model capability detection for context windows, supported input types, and reasoning settings.
    • Model families and tagged variants are matched more reliably, with exact model settings taking priority.
    • Text-only model configuration now takes precedence when determining vision support.
    • Prevented unrelated or specially named models from being incorrectly treated as supported capabilities.
  • Tests
    • Added coverage for family matching, exact-model precedence, provider and registry fallbacks, vision exclusions, and invalid model identifiers.

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Deterministic PR hygiene checks passed.

@github-actions github-actions Bot added the bug Something isn't working label Aug 19, 2026
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📝 Walkthrough

Walkthrough

The change updates routing capability evidence to use normalized model matching. Input modality evaluation now prioritizes noVisionModels. Tests cover family matching, exact-entry precedence, fallbacks, registry matching, modality precedence, and prototype-shaped model IDs.

Changes

Capability matching

Layer / File(s) Summary
Accessor-based capability lookups
src/routing/capability.ts
candidateCapabilityEvidence uses normalized accessors for context windows, input modalities, and reasoning efforts. Matching models in noVisionModels receive text-only evidence. Existing fallbacks remain.
Model matching regression coverage
tests/routing-capability-model-matching.test.ts
Tests cover configured and registry family entries, exact model overrides, provider-wide fallbacks, no-vision precedence, and prototype-safe lookups.

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

Merge Risk: 🟡 Moderate · up to 3c94b

The routing fix is localized and well tested, but the PR still reports that it has not been pushed to the latest dev commit; that required readiness step should be completed before merging.

Possibly related PRs

Suggested labels: review-ready

Suggested reviewers: ingwannu

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❌ Failed checks (1 warning)

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Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely describes the main change: aligning routing capability evidence resolution with runtime resolver behavior.
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Actionable comments posted: 1

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Inline comments:
In `@tests/routing-capability-model-matching.test.ts`:
- Around line 36-94: Add a focused test in the candidateCapabilityEvidence
model-matching suite that relies on a matching PROVIDER_REGISTRY entry while
leaving the provider unconfigured, then assert family matching resolves the
context window, input modalities, and reasoning efforts. Reuse the existing
registry/configuration helpers and preserve the current configured-provider
cases.
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Comment thread tests/routing-capability-model-matching.test.ts
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github-actions Bot marked this pull request as draft August 19, 2026 09:16
@lidge-jun

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Reviewed as part of a four-PR batch (#2077, #2085, #2086, #2100) that applies the same modelRecordValue migration at four call sites.

The six migrated map reads are correct, and the "definite wrong answer" framing checks out: a missed modelContextWindows lookup falls through to the provider-wide contextWindow (src/routing/capability.ts:162) rather than degrading to unknown.

Holding on one gap. The migration resolves modelInputModalities and derives image without first checking noVisionModels. With:

noVisionModels: ["gpt-oss"],
modelInputModalities: { "gpt-oss:120b": ["text", "image"] }

the runtime returns text-only — isModelTextOnly matches noVisionModels and returns before it ever reads the modality map — while candidateCapabilityEvidence reports image: true. Routing acts on this evidence, so it can select a candidate for image work that execution then rejects. #2086 fixes exactly this ordering on the CLI surface; the same precedence is needed here.

Also: contextWindow.not.toBe(8_000) is a weak assertion — it passes for undefined and for any other wrong value. An exact expectation would be a stronger oracle.

Minor: the description says five tests; the diff has six.

Happy to merge once the no-vision precedence lands with a regression for the conflicting-evidence case.

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Reviewed as part of a four-PR batch with #2077, #2085, and #2086 — same idea at four call sites, so one shared contract verdict plus per-PR verdicts.

Verdict: hold — the migration is incomplete in a way that matters here specifically.

The six map reads are migrated correctly, and the context-window claim checks out: a raw miss falls through to the provider-wide contextWindow (src/routing/capability.ts:162), which is a definite wrong value rather than an absent one. That half is good.

What is missing: noVisionModels precedence. The PR resolves modelInputModalities and derives image without first checking noVisionModels. Given:

noVisionModels: ["gpt-oss"],
modelInputModalities: { "gpt-oss:120b": ["text", "image"] }

the runtime returns text-only (isModelTextOnly matches the no-vision list first, src/vision/index.ts:29) while candidateCapabilityEvidence reports image: true.

This is the same ordering bug #2086 fixes on the CLI surface, left unfixed on the routing surface — and it is worse here, because routing acts on this evidence. It can select a candidate for image work that execution then rejects. The PR's own stated goal is that the evidence agree with the resolver it describes, so this is a gap in its own terms rather than an added requirement.

To land: check noVisionModels before deriving modalities, and add a regression for the conflicting-evidence case above.

One test note: contextWindow.not.toBe(8_000) is red against the known bug but weak — it also accepts undefined or any other wrong value. Assert the expected number.

Also, the description is stale: the diff has six tests, not five, and the unfixed split should be 2 pass / 4 fail once the registry-family test is counted.

@lidge-jun

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리뷰 · 우선순위 28 / 80

라우팅 evidence가 런타임 리졸버와 다른 맵을 읽는 버그를 고친다. candidateCapabilityEvidence()modelContextWindows / modelInputModalities / modelReasoningEfforts를 베어 인덱스로 봐서, gpt-oss 패밀리 값이 gpt-oss:120b에 안 붙었다. 윈도우는 unknown으로 안 떨어지고 프로바이더 전역 contextWindow(8000)로 떨어져 잘못된 확정 값이 됐다. modelRecordValue로 바꾸면 런타임과 같아진다. 아이디어는 한 50이다. 지금 점수는 28이다. draft, 체크리스트 0/4, 메인테이너가 이미 hold한 상태다.

코드는 src/routing/capability.ts 한곳이다. 세 맵의 프로바이더/레지스트리 조회가 modelRecordValue(...)를 탄다. 프로바이더 전역 contextWindow와 카탈로그/네이티브 fallback 순서는 그대로다. 프로토타입 키(constructor)는 hasOwnProperty 때문에 함수가 evidence로 안 들어간다. 이 모양은 #2042/#2059/#2086/#2077과 같은 클래스다.

tests/routing-capability-model-matching.test.ts가 패밀리 커버, 전역 윈도우로 안 떨어짐, exact > family, 무관 모델의 전역 fallback, 레지스트리 tagged sibling, prototype id를 본다. 첫 테스트는 modelRecordValueisModelTextOnly를 evidence보다 먼저 고정한다. 저자가 말한 대로 src만 되돌리면 3개가 깨진다.

메인테이너 hold는 이 마이그레이션이 imagemodelInputModalities에서 바로 파느라, 런타임 isModelTextOnly가 보는 다른 경로와 어긋날 수 있다는 점이다. 이 테스트는 custom 픽스처에서 둘을 같게 만들지만, 비전 사이드카/네이티브 분기를 전부 같게 만들었다는 증명은 아니다. 패치는 추측하지 않음. hold 이유를 이 브랜치에서 다시 반박하지 않는다.

해결방안

메인테이너가 지적한 image/isModelTextOnly 구멍을 메우거나, 그 차이가 이 모듈 계약상 괜찮은지 한 문장으로 답하라. 그다음 체크리스트 4칸을 채우고 draft를 해제하라. #2077과 같이 modelRecordValue 배치로 보지 말고, 이 파일의 evidence 계약만 닫아라. 지금 상태로는 머지하지 않는다.

이 댓글은 grok-bot이 작성했습니다

@ntdatt812
ntdatt812 force-pushed the fix/routing-capability-family branch from ed11ac1 to 3c94b9a Compare August 19, 2026 13:00
ntdatt812 added a commit to ntdatt812/opencodex that referenced this pull request Aug 19, 2026
Review feedback on lidge-jun#2100: the migration resolved `modelInputModalities`
without first consulting `noVisionModels`, so the evidence still disagreed
with the resolver it claims to describe. Given

    noVisionModels: ["gpt-oss"]
    modelInputModalities: { "gpt-oss:120b": ["text", "image"] }

`isModelTextOnly` matches the no-vision list and returns true before it ever
reads the modality map (src/vision/index.ts:32), so the runtime says text-only
while `candidateCapabilityEvidence` reported `image: true`.

This is worse here than on the CLI surface lidge-jun#2086 fixed: routing acts on this
evidence, so it can select a candidate for image work that execution then
refuses. Same ordering, same primitives as the merged lidge-jun#2086.

Also strengthens the window oracle the review flagged: `not.toBe(8_000)` also
passed for `undefined` and for any other wrong value, so it is now the exact
expected number.

Two new tests. The positive one is red without this change; the negative one
(a model outside noVisionModels keeps its declared image modality) passes
either way on purpose -- it guards the fix from over-reaching rather than
demonstrating the defect.

Against origin/dev the file is 5 fail / 3 pass; against this branch's previous
commit, 1 fail / 7 pass.
@ntdatt812
ntdatt812 marked this pull request as ready for review August 19, 2026 13:01
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@lidge-jun the noVisionModels gap is real and is fixed in 3c94b9a7c. I checked it against the code rather than taking it on trust, and you are right on both counts.

isModelTextOnly matches the no-vision list and returns before it ever reads modelInputModalities (src/vision/index.ts:32), so with

noVisionModels: ["gpt-oss"],
modelInputModalities: { "gpt-oss:120b": ["text", "image"] }

the runtime says text-only and the evidence said image: true. Fixed with the same ordering and the same primitives as the merged #2086, so the two surfaces now read alike:

const noVision = modelInList(provider?.noVisionModels, modelId);
const modalities = noVision ? ["text"] : (…the existing chain…);

I deliberately did not import isModelTextOnly here, even though reusing the runtime function is the strongest form of "resolve the way the runtime resolves". src/vision/index.ts pulls in the OAuth store, the sidecar and the web-search executor, and this module's docblock commits to "canonical local sources only … no live network fetch happens at routing time". There is no import cycle — I checked — so if you would rather have the direct call and accept the module weight, say so and I will switch it.

Two tests. The positive one is red without the change; the negative one — a model outside noVisionModels keeps its declared image modality — passes either way on purpose, so the fix cannot trade a false positive for a false negative.

The weak oracle is also fixed. You were right that not.toBe(8_000) also passes for undefined and for any other wrong value; it now asserts 131_072 exactly.

Corrected counts, since the old ones were stale. The file is eight tests, not five. Reverting only src gives 5 fail / 3 pass, not 2/4 — the registry-family case counts, as you said, and the new no-vision case adds one. The description now carries these numbers instead of the old ones.

Rebased onto 7a2d13a74; the branch was 31 commits behind. Checklist ticked and out of draft.

One thing I want to state rather than bury: the full bun run test had a single failure, CL-03 … preserves the output byte ceiling as output_byte_limit in tests/lab-live-pinned-timeouts.test.ts. It passes 3/3 in isolation. That file's default firstByteTimeoutMs is 30 ms, so under full-suite CPU contention the first-byte timeout wins the race against accumulating 16 bytes; it imports only lib/lab-live-pinned-sender, and this PR touches only src/routing/capability.ts. I am reporting it rather than calling the run clean, but I have not touched that test — tell me if you would rather it were made deterministic and I will open it separately.

@github-actions
github-actions Bot marked this pull request as draft August 19, 2026 13:02
…es it

candidateCapabilityEvidence read modelContextWindows,
modelInputModalities and modelReasoningEfforts with bare lookups, while
every runtime reader of those maps goes through modelRecordValue, which
accepts a family entry for a tagged id.

With contextWindow 8_000, modelContextWindows {"gpt-oss": 131_072},
modelInputModalities {"gpt-oss": ["text"]} and modelReasoningEfforts
{"gpt-oss": ["low","high"]}, for gpt-oss:120b:

  runtime    131_072, text-only, [low, high]
  evidence   {"contextWindow":8000,"tools":true,...}

The window is the worst of the three. It did not degrade to unknown --
it fell through to the provider-wide contextWindow, so routing acted on
a definite value belonging to a different model. That is exactly what
this module's "unknown is not zero" contract exists to prevent. The
other two dimensions simply went missing, which at least reads as
unknown.

A bare lookup also answered for prototype-shaped ids: a model named
"constructor" resolved Object.prototype.constructor as its evidence.
modelRecordValue uses hasOwnProperty, so that now resolves nothing.

Five tests; three are red without the src change, two are guards
against the fix over-reaching and pass either way. 68 tests green
across the six routing/capability files. tsc --noEmit clean.
The three registry lookups this PR changed are only reached when the
provider is absent from the config, and every case in the file supplied
one — so `registryEntry?.model*` went untested.

Add a case that resolves `grok-4.6:latest` off the `xai` registry entry
with no provider configured, asserting the window, the image modality and
the reasoning efforts. It asserts the fixture's shape rather than its
values, so registry churn does not turn into a false failure while real
drift still does.

Against origin/dev the new case fails with `Expected: 500000, Received:
undefined`, which is the branch it is meant to hold.

Thanks @coderabbitai for the catch.
Review feedback on lidge-jun#2100: the migration resolved `modelInputModalities`
without first consulting `noVisionModels`, so the evidence still disagreed
with the resolver it claims to describe. Given

    noVisionModels: ["gpt-oss"]
    modelInputModalities: { "gpt-oss:120b": ["text", "image"] }

`isModelTextOnly` matches the no-vision list and returns true before it ever
reads the modality map (src/vision/index.ts:32), so the runtime says text-only
while `candidateCapabilityEvidence` reported `image: true`.

This is worse here than on the CLI surface lidge-jun#2086 fixed: routing acts on this
evidence, so it can select a candidate for image work that execution then
refuses. Same ordering, same primitives as the merged lidge-jun#2086.

Also strengthens the window oracle the review flagged: `not.toBe(8_000)` also
passed for `undefined` and for any other wrong value, so it is now the exact
expected number.

Two new tests. The positive one is red without this change; the negative one
(a model outside noVisionModels keeps its declared image modality) passes
either way on purpose -- it guards the fix from over-reaching rather than
demonstrating the defect.

Against origin/dev the file is 5 fail / 3 pass; against this branch's previous
commit, 1 fail / 7 pass.
@ntdatt812
ntdatt812 force-pushed the fix/routing-capability-family branch from 3c94b9a to c90692c Compare August 19, 2026 13:56
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