fix(google): allow structured output for Gemini models on Cloud Code Assist

[agentHits]

Summary

Closes #4669

Allow structured output (text.format / response_format) for Gemini models on Cloud Code Assist (google-antigravity).

• Lift the blanket Cloud Code Assist refusal in src/adapters/google.ts when modelId starts with gemini-.
• Route structured output into generationConfig.responseMimeType: "application/json" and generationConfig.responseJsonSchema inside envelope.request.generationConfig. The existing compileGoogleWireBody whitelist already passes both keys into the wire envelope.
• Retain explicit fail-closed refusal for non-Gemini models (such as Claude) served through Cloud Code Assist ("google cloud-code-assist structured output is not implemented by opencodex for non-Gemini models — remove response_format or route this model through a direct provider").
• Preserve existing refusals for image-capable models (responseModalities conflict) and schemaless json_schema.
• Update structure/providers/google.md and expand tests/adapters/google/google-structured-output.test.ts to cover Gemini-on-CCA (json_schema and json_object) and Claude-on-CCA rejection.

Verification

Ran focused checks covering the changed subsystems:

• bun test tests/adapters/google/google-structured-output.test.ts (12 pass, 0 fail across 23 assertions, covering AI Studio, Vertex, Gemini-on-CCA, and explicit refusals for Claude-on-CCA, image-capable, and schemaless json_schema)
• bun run structure:check (structure/ SSOT checks passed)
• bun run typecheck (tsc --noEmit exited with code 0)

Full bun test was not run per repository instructions for scoped adapter changes.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

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• All CI tests are green on my local testing.

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Summary by CodeRabbit

• Bug Fixes
  • Structured-output settings now work for Gemini models routed through Cloud Code Assist.
  • JSON object and schema-based output configurations are correctly applied to supported Gemini requests.
  • Unsupported non-Gemini and image-capable models continue to be rejected with clear guidance to use a direct provider.
  • Cloud Code Assist requests now preserve the appropriate generation settings without exposing unsupported top-level configuration.

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• tests/adapters/google/google-structured-output.test.ts

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• tests/adapters/google/google-structured-output.test.ts

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📝 Walkthrough

Walkthrough

Cloud Code Assist now passes structured-output settings for Gemini models through envelope.request.generationConfig. Non-Gemini models, including Claude, remain rejected. Tests cover supported wire formats and rejection cases.

Changes

Cloud Code Assist structured output

Layer / File(s)	Summary
Gemini structured-output routing src/adapters/google.ts, structure/providers/google.md	At src/adapters/google.ts:799-806, rejection now applies only to non-Gemini model IDs. At structure/providers/google.md:65-71, structured-output settings are documented under envelope.request.generationConfig.
Structured-output validation tests/adapters/google/google-structured-output.test.ts	The tests add the required Cloud Code Assist project and envelope type. They verify nested JSON Schema and JSON-object settings, and rejection for Claude and gemini-3-pro-image-preview.

Priority: ➖ Normal

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

Change: Feature · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 3169d

Supported Gemini structured output is routed into the Cloud Code Assist request envelope, while unsupported model cases remain rejected. No actionable merge-blocking issue is established.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: enabling structured output for Gemini models on Cloud Code Assist. It matches the implementation and stated objectives.
Linked Issues check	✅ Passed	Issue #4669 requires json_schema and json_object support for Gemini models on Cloud Code Assist. In src/adapters/google.ts around line 799, the refusal now applies only when googleMode is `clo…
Out of Scope Changes check	✅ Passed	The changes stay within issue #4669. src/adapters/google.ts changes the Cloud Code Assist structured-output gate and its error message. tests/adapters/google/google-structured-output.test.ts adds …

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[lidge-jun]

리뷰 · 우선순위 69 / 80

이 PR은 초안(draft) 이고, 이슈 #4669를 닫으려는 작은 버그 수정이다. 지금 dev(HEAD aa91958e3, 패키지 2.56.0, #4661 라운드3 + import-resolution 가드 이후)에서 Google 어댑터는 Cloud Code Assist(googleMode === "cloud-code-assist", 곧 google-antigravity)로 들어오는 모든 text.format / structured output 요청을 로컬에서 바로 거절한다. 그래서 Gemini 모델로 보낸 json_schema / json_object 도 네트워크에 나가기 전에 HTTP 400이 난다. 이슈에 적힌 메시지가 바로 그 거절이다.

고치는 방식은 단순하다. src/adapters/google.ts 의 거절 조건을 “CCA면 전부 거절”에서 “CCA이면서 모델 id가 gemini- 로 시작하지 않으면 거절”로 좁힌다. Gemini면 기존과 같이 generationConfig.responseMimeType = "application/json" 과 (스키마가 있으면) responseJsonSchema 를 채운다. CCA 경로는 그 flat body를 그대로 envelope.request 안으로 감싸므로, 키는 envelope.request.generationConfig 아래에 실린다. compileGoogleWireBody / compileGenerationConfig 화이트리스트에 이미 두 키가 있어서, 어댑터만 열어 주면 와이어에서 다시 떨어지지 않는다.

비 Gemini(예: Claude-on-CCA)는 계속 명시적으로 거절한다. 침묵하면 스키마 없는 일반 문장이 “성공”처럼 보이기 때문이다. 이미지 출력 모델(responseModalities 충돌)과 스키마 없는 json_schema 거절도 그대로 둔다. 테스트는 CCA Gemini의 envelope 위치 검사 두 개와 Claude-on-CCA 거절 이름 변경을 추가했고, CCA fixture에 project: "test-project" 를 넣었다. 지금 dev 코드는 CCA 경로에서 provider.project 가 없으면 바로 throw 하므로, 이 fixture 보강은 맞다. structure/providers/google.md 도 “CCA 전부 미구현”에서 “CCA의 비 Gemini만 미구현”으로 고쳤다.

types.ts / config.ts 모놀리스를 건드리지 않는다. 소비자 import 경로 불변식과도 무관하다. #4655 파사드 열차나 #4546 과는 겹치지 않는 독립 어댑터 버그다. 초안 체크리스트(로컬 CI 전부 초록, 최신 dev rebase, CodeRabbit/Codex 정리, ready)는 아직 비어 있다. 리뷰 시점 status check는 hygiene 계열 5개가 SUCCESS 였고 mergeable 이지만 draft라 BLOCKED 상태다.

라인 / 경로 수준으로 보면 큰 거짓 버그는 없고, 확인·주의 포인트만 적는다.

라인 799 근처 (src/adapters/google.ts) - 거절 게이트가 parsed.modelId.startsWith("gemini-") 이다. 같은 파일의 CCA thought/include 경로는 routedModelId / wireModelId 에 /^gemini-/ 를 쓴다. 오늘 시드 모델은 둘 다 gemini-… 라 맞지만, 나중에 alias·rename 이 wire만 바꾸고 parsed id는 안 바꾸면 게이트와 wire 판정이 어긋날 수 있다
라인 809 이후 - 이미지 출력 모델 거절은 CCA 완화 뒤에도 그대로 실행된다. Gemini-on-CCA 이미지 모델에 structured output을 열지 않는 불변식은 유지된다. 다만 그 조합을 덮는 CCA 전용 회귀 테스트는 없다
tests/.../google-structured-output.test.ts - envelope 위치(request.generationConfig)와 Claude 거절은 잘 잡는다. 업스트림 CCA가 실제로 schema를 강제하는지는 로컬 buildRequest 단위로는 증명되지 않는다(의도적 fail-open이 아니라 “와이어 키가 나간다” 증명)
structure/providers/google.md - 문서와 코드 거절 범위가 다시 맞춰졌다
에러 문구 - “AI Studio or Vertex”에서 “a direct provider”로 바뀌었다. 의미는 통하지만, 사용자에게 구체 우회 경로가 조금 덜 보인다

메인테이너의 판단이 필요한 지점

• draft를 ready로 올리기 전에 “와이어 키가 envelope에 실리는 것”만으로 충분한지, 아니면 한 번의 수동/스테이징 CCA 호출로 schema 강제까지 볼지
• 게이트를 parsed.modelId 기준으로 둘지, CCA의 routedModelId/wireModelId 와 맞출지
• 이미지 출력 Gemini-on-CCA + textFormat 거절을 테스트에 한 줄 더 넣을지(필수는 아님)
• [Provider compatibility] Cloud Code Assist rejects structured output on Gemini models #4669 재현이 Codex Desktop helper의 response_format 경로라면, 머지 후 그 클라이언트에서 한 번만 스모크할지

너의 추천
초안이므로 지금은 머지하지 말고, 작성자 체크리스트를 채운 뒤 ready로 전환하는 쪽이 맞다. 코드 방향 자체는 dev 에 맞아 보인다: Gemini-on-CCA만 열고 비 Gemini는 fail-closed, 기존 이미지/스키마리스 거절 유지, 테스트·structure 문서가 같은 이야기를 한다. ready 전에 (1) gemini- 판정을 parsed vs wire 중 어디에 둘지 한 줄 확인하고 (2) 가능하면 image-capable Gemini-on-CCA 거절 테스트를 하나 보태면 더 안전하다. types/config 스플릿 때문에 닫을 PR은 아니다. 충돌 없이 rebase 가능하면 유지하고, ready 후 머지하면 된다.

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Actionable comments posted: 1

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Inline comments:
In `@tests/adapters/google/google-structured-output.test.ts`:
- Around line 60-80: Add a Cloud Code Assist regression test alongside the
existing CCA structured-output tests, using model gemini-3-pro-image-preview and
the image-capable configuration. Assert that buildRequest rejects structured
output with the exact error message “cannot combine image output with structured
output,” covering the googleMode: "cloud-code-assist" admission path.

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[Ingwannu]

Requesting changes on exact head 11e343e5f877b21aa6f0b2ce52048baf0e34d788. The Gemini-only Cloud Code Assist admission is the right direction and is preferable to the broader duplicate #4693, but two focused test boundaries should be fixed before this becomes a merge candidate.

1. Add the missing CCA image-capable regression. The new condition now lets gemini-* pass the CCA gate and relies on the following isImageCapableModel guard to refuse the conflicting JSON constraint. Exercise a Cloud Code Assist provider with gemini-3-pro-image-preview (or the current canonical image fixture) and assert the exact cannot combine image output with structured output failure. Without this, the branch-specific ordering that keeps image generation fail-closed is not pinned.

2. The two new envelope assertions parse into Record<string, any>. Please use a narrow local envelope type or an unknown record helper for request.generationConfig. These tests are the contract proof for where CCA places the schema; any makes a misspelled or non-object intermediate path compile silently and weakens that proof.

After those changes, rerun the focused Google structured-output suite and exact-head hosted checks. I am not authorizing or treating the current external CI as merge evidence because the head needs to change.

[agentHits]

@Ingwannu Both requested test boundaries are on 22965dc2d3303217a6da25042997c41ca026c8c3 (current head; 0 commits behind dev):

1. CCA image-capable regression: an image-capable Cloud Code Assist model refuses the structured-output conflict asserts the exact cannot combine image output with structured output failure for gemini-3-pro-image-preview on a Cloud Code Assist provider.
2. Envelope assertions now parse as a local CloudCodeAssistEnvelope instead of Record<string, any>.

Local verification on that exact head:

• bun test tests/adapters/google/google-structured-output.test.ts — 12 pass / 0 fail
• bun run typecheck — clean

I did not change the parsed.modelId.startsWith("gemini-") gate versus wireModelId; today's seed ids still match, and I am leaving that unless you want it aligned.

Full bun run test on this machine still fails in unrelated host-sensitive files (Codex runtime discovery with a local install; Linux bubblewrap treating the Bun binary as a non-private executable). None of those files are in this PR. I am not ticking the local-CI / ready boxes until hosted CI is green on this head.

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