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feat(models): mirror top-level context_window and max_output_tokens in model capability rows - #4802

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Yum-wu:fix/models-listing-capacity-fields

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@Yum-wu Yum-wu commented Sep 16, 2026

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Summary

Mirrors top-level context_window, context_length, and max_output_tokens directly on model objects in /v1/models responses alongside existing nested capabilities.* fields.

External OpenAI-compatible tools and clients (e.g. pi-ai, DSH/Claude Code integrations, LibreChat) discover model capacities from flat top-level properties rather than Cursor's nested capabilities.context_length and capabilities.max_output_tokens schema. Mirroring these sanitized positive integers at the top level preserves Cursor compatibility while enabling universal client capacity auto-detection.

Changes

  • src/server/models-capabilities.ts:
    • In modelCapabilityFields, emit top-level context_window, context_length alias, and max_output_tokens when effective positive limits are present.
    • Document the mirrored keys on ModelCapabilityFields and in the module-level header.
  • tests/providers/cursor/cursor-local-models-schema.test.ts:
    • Add assertions verifying top-level context_window, context_length, and max_output_tokens mirroring on valid flat and long-tier inputs, as well as omission on empty/invalid inputs.
    • Assert top-level fields directly on fetched /v1/models endpoint rows (k3 and sol).

Verification

  • Ran bun test covering modelCapabilityFields and endpoint integration tests: all passed.

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@github-actions github-actions Bot added the enhancement New feature or request label Sep 16, 2026
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📝 Walkthrough

Walkthrough

The model capability response adds optional top-level context_window, context_length, and max_output_tokens fields. The builder mirrors capability values and applies the effective context length. Tests cover standard, long-tier, routed, and invalid inputs.

Changes

Capability mirroring

Layer / File(s) Summary
Capability fields and validation
src/server/models-capabilities.ts, tests/providers/cursor/cursor-local-models-schema.test.ts
ModelCapabilityFields declares the three optional top-level fields. modelCapabilityFields mirrors the effective context length and maximum output tokens. Tests verify standard and long-tier values, routed model rows, and omission for invalid inputs.

Priority: ⬇️ Low

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

Change: Feature

Merge Risk: ⚪ Minimal · up to 14c47

The mirrored fields and standard, long-tier, routed, and invalid-input behaviors are covered; the change is mergeable pending normal checks.

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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 primary change: adding top-level model capability fields that mirror existing values.
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✅ READY

  • all PR quality gates passed; the review readiness checklist is complete.

Review readiness checklist

  • ✅ All CI tests are green on my local testing.
  • ✅ I pushed my PR to the latest dev commit.
  • ✅ I resolved all correct Codex and CodeRabbit findings.
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Maintainers notified: @lidge-jun @Ingwannu

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리뷰 · 우선순위 68 / 80

이 PR(#4802)은 Yum-wu가 올린 좁은 카탈로그 호환 개선이다. 바꾸는 파일은 src/server/models-capabilities.tstests/providers/cursor/cursor-local-models-schema.test.ts 두 개뿐이고(+25/−3), 베이스는 지금 dev tip인 dc9d1fabc(package 2.57.0, 마지막 머지 #4796 Windows TEMP 격리·회수)에 맞춰져 있다. types.ts/config.ts 분할 캠페인이나 pre-split 경로를 건드리지 않으므로 close-don't-rebase 대상이 아니다. 프리뷰 배포도 계획에 없고, 이 변경은 GET /v1/models 행 shape만 건드린다.

지금 dev에서 modelCapabilityFields는 Cursor Private Inference용으로 api_types와 nested capabilities.context_length / capabilities.max_output_tokens를 만든다. long-tier(기본 창 < 긴 창)가 있으면 nested context_length에는 긴 창을 넣고, 기본 창은 pricing.overrides[].min_prompt_tokens로만 실어 Cursor Context 선택기를 켠다. 이 필드는 src/server/index/serve-options.tsnativeModelRow와 routed row mapper가 spread해서 /v1/models data[]에 붙는다. 그런데 pi-ai, DSH/Claude Code, LibreChat 같은 OpenAI 호환 클라이언트는 nested capabilities.*를 안 보고 top-level context_window / max_output_tokens만 읽는 경우가 많다. 그래서 지금 카탈로그는 Cursor에는 용량이 보이는데 외부 도구에는 “용량 없음”으로 보이는 구멍이 있다.

고치는 방법은 간단하다. effectiveContextLength(= long-tier면 long, 아니면 기본)를 계산해 nested capabilities.context_length와 같은 값을 top-level context_window로 한 번 더 넣고, max_output_tokens도 top-level에 같은 정수를 거울처럼 붙인다. 값이 없거나 positiveInt를 통과하지 못하면 키 자체를 생략해서, 빈/잘못된 입력에서 0이나 NaN이 새지 않게 한다. 테스트는 flat 입력(200k/64k)에서 nested와 top-level이 같고, 빈 입력에서는 top-level 키가 없는 것을 잠근다. 기존 long-tier·sanitization 테스트는 그대로 두고 새 케이스만 추가했다.

현재 dev 방향과 맞춰 보면, tip #4796은 테스트 TEMP 격리이고 그 아래 #4797 계정 선택 가드, #4801 로그/웹서치 경계다. 이 PR은 카탈로그 광고 호환 줄에 있다. Cursor 전용 nested schema를 깨지 않으면서 외부 클라이언트 discovery만 맞추려는 의도라서 방향은 맞고, 체크리스트 4/4와 review-ready도 이미 붙어 있다. 다만 long-tier 행에서 top-level이 “긴 창”을 광고하는 의미와, 그 경우를 잠그는 테스트가 빠진 점이 점수에서 조금 깎인다.

라인 src/server/models-capabilities.ts effectiveContextLength / top-level context_window - long-tier(예: 272k/922k)일 때 top-level context_window도 922k가 된다. nested capabilities.context_length와는 일치하지만, Max Mode/pricing을 모르는 외부 클라이언트는 기본 창이 922k라고 오해하고 큰 프롬프트를 보낼 수 있다. 기본 창(272k)을 top-level에 두고 긴 창은 nested+pricing에만 둘지 판단이 필요하다.
라인 tests/.../cursor-local-models-schema.test.ts 새 테스트 - flat 입력과 빈 입력만 잠근다. contextWindow: 272000, longContextWindow: 922000일 때 top-level context_window === 922000(또는 유지자가 고른 다른 정책)인지, invalid(0 / unsafe int)에서 top-level 키 생략인지가 없다.
경로/심볼 ModelCapabilityFields JSDoc - top-level 키 설명은 추가됐지만, 파일 상단 모듈 주석은 여전히 “Cursor nested schema” 중심이라 외부 미러 의도가 한눈에 안 들어온다. 한 줄만 보강하면 이후 기여자가 nested만 손대다 top-level을 깜빡하기 어렵다.
경로/심볼 키 이름 비대칭 - nested는 context_length, top-level은 context_window다. 클라이언트 discovery용이라 의도적이지만, 둘 다 읽는 도구는 값이 같아도 이름 차이로 헷갈릴 수 있다. context_length top-level 동시 미러가 필요한지는 범위 밖일 수 있다.
경로/심볼 Cursor 검증 - Cursor는 주로 capabilities를 검증하고 알 수 없는 top-level 키는 보통 무시한다. 그래도 Private Inference 빌드에서 행이 drop되지 않는지만 exact-head CI/수동 listing으로 한 번 확인하는 편이 안전하다.
경로/심볼 CI·mergeState - 로컬 modelCapabilityFields 4케이스 통과만으로 머지하지 말고, exact-head 호스티드 CI 초록을 기다린다.

메인테이너의 판단이 필요한 지점

  • long-tier 행의 top-level context_window를 nested와 같이 긴 창으로 둘지, 외부 클라이언트용으로 기본 창만 미러할지.
  • top-level에 context_length 별칭까지 넣을지, 이번 PR처럼 context_window + max_output_tokens만으로 충분한지.
  • Cursor local listing에서 새 top-level 키가 행을 깨지 않는지 확인을 머지 전에 필수할지.
  • 프리뷰 배포는 계획에 없다. /v1/models JSON shape 확인이면 충분하다.

너의 추천
방향은 맞고 범위도 좁다. long-tier 미러 기대값을 테스트로 한 줄 잠그고(지금 정책이면 922k), 모듈 상단 주석에 “top-level mirror for external clients” 한 줄을 넣은 뒤 exact-head CI 초록이면 머지 후보로 둔다. long-tier에서 기본 창만 top-level에 올리고 싶다면 그 정책을 먼저 정한 다음 테스트를 그에 맞춘다. types/config 분할·중복 close 대상 아님. 같은 주제의 열린 중복 PR은 빠른 스캔에서 보이지 않았다.

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Actionable comments posted: 1

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Inline comments:
In `@tests/providers/cursor/cursor-local-models-schema.test.ts`:
- Around line 127-136: The `/v1/models` endpoint test should also verify
top-level context_window and max_output_tokens on fetched model rows, not only
nested capability values. Update the endpoint assertions alongside the existing
fetched-row checks, preserving the current nested capability assertions.

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Comment thread tests/providers/cursor/cursor-local-models-schema.test.ts
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The compatibility argument is sound — flat context_window / max_output_tokens is what most OpenAI-compatible clients actually read, and the refactor to a single effectiveContextLength removes a duplicated ternary rather than adding one. Sanitising through positiveInt before mirroring is the right instinct too.

One thing worth deciding deliberately before this lands: the long tier is mirrored without the signal that travels with it.

Ran modelCapabilityFields({ contextWindow: 272000, longContextWindow: 922000, maxOutputTokens: 64000 }) on fix/models-listing-capacity-fields:

TOP-LEVEL (what a flat-property client reads)
  context_window:     922000
  context_length:     922000
  max_output_tokens:   64000

NESTED (what Cursor reads)
  capabilities.context_length: 922000
  pricing: {"overrides":[{"min_prompt_tokens":272000}]}

In the nested shape those two always appear together — hasLongTier gates both the long context_length and the pricing.overrides entry saying everything past 272000 is a different tier (L177). A Cursor client reads the generous number and the caveat in the same row.

The mirror copies the window but not the caveat, and pricing stays in the Cursor-shaped part of the row. So the clients this PR exists to serve — the ones that read flat properties precisely because they don't parse the nested schema — see context_window: 922000 with nothing indicating that 650k of it is priced differently. A client that sizes its context budget off that number will do the thing the override exists to warn about.

Three ways to go, and I don't think it's my call which:

  1. Mirror the standard window (contextLength) at the top level and leave the long tier to the nested shape. Conservative; a flat client never over-reaches, at the cost of under-advertising.
  2. Mirror the long window as-is and say so in the PR description, as a deliberate "advertise the maximum, pricing is discoverable in the row" decision.
  3. Mirror the long window but also flatten the tier boundary alongside it, so the caveat reaches the same reader as the number.

The test already pins the long-tier behaviour (tiered.context_window === 922000), so whichever you pick, it'd be worth a line in that test saying why — otherwise the next person reading it can't tell the 922000 from a bug.

Everything else checks out — context_length and context_window agree, the non-tiered path is unchanged, and undefined inputs still omit the keys rather than emitting undefined.

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