fix(chat): preserve JSON completion semantics in streaming delivery - #3803
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📝 WalkthroughWalkthroughThis change adds JSON Responses to Chat SSE fallback support. It preserves reasoning, tool calls, usage, and finish reasons. It adds translator-budget enforcement, typed errors, request-log finalization, documentation, and focused tests. ChangesChat protocol fallback
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The JSON-to-SSE fallback preserves additional Chat completion semantics, but refusal content may still be omitted and non-streaming/error-path regression coverage is incomplete. This can cause clients to receive incomplete refusal information or allow malformed error responses to go undetected, so the outstanding issues should be resolved before merge. Sequence Diagram(s)sequenceDiagram
participant ChatClient
participant handleChatCompletions
participant responsesJsonToChatCompletion
participant jsonCompletionSse
ChatClient->>handleChatCompletions: Send streaming Chat request
handleChatCompletions->>responsesJsonToChatCompletion: Convert complete Responses JSON
responsesJsonToChatCompletion-->>handleChatCompletions: Return semantic Chat completion
handleChatCompletions->>jsonCompletionSse: Serialize completion with budget
jsonCompletionSse-->>ChatClient: Return SSE frames and [DONE]
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✅ Passed checks (5 passed)
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Actionable comments posted: 1
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Inline comments:
In `@src/server/chat-native-sse.ts`:
- Line 113: Update responsesJsonToChatCompletion to populate message.refusal
from refusal content, then update jsonCompletionSse to emit delta.refusal when
it is a non-empty string while preserving the existing content,
reasoning_content, tool_calls, and streaming event contract.
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📒 Files selected for processing (17)
devlog/_plan/260907_track2_protocol/000_plan.mddevlog/_plan/260907_track2_protocol/010_chat_json_sse.mddevlog/_plan/260907_track2_protocol/011_chat_audit_amendment.mddevlog/_plan/260907_track2_protocol/020_refusal.mddevlog/_plan/260907_track2_protocol/030_custom_efforts.mddevlog/_plan/260907_track2_protocol/040_hosted_search_disposition.mddevlog/_plan/260907_track2_protocol/050_claude_compatibility.mddevlog/_plan/260907_track2_protocol/060_remote_delivery.mddocs-site/src/content/docs/reference/proxy-formats.mdscripts/test-layout/layout.jsonsrc/chat/outbound.tssrc/server/chat-completions.tssrc/server/chat-native-sse.tssrc/server/chat-native.tsstructure/04_transports-and-sidecars.mdtests/fixtures/test-layout-expected.jsontests/responses/chat-json-sse-fallback.test.ts
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리뷰 · 우선순위 74 / 80이 PR은 Track2 스택의 맨 아래층이다. 베이스는 현재 이 PR은 그 구멍을 메운다. JSON→Chat 변환에 incomplete reason 분류와 translatorBudget 계측을 넣고, 네이티브·번역 JSON 폴백이 모두 스택 위치도 분명하다. #3804(카탈로그 reasoning 정규화), #3805(refusal 보존), #3806(Claude 호환 게이트)가 이 브랜치 위에 쌓여 있다. 최종 통합 CI는 스택 헤드 코드 쪽 핵심은 한 가지 범위 메모: 이 PR에 Track2 전체 plan 문서( 라인 563 근처 src/chat/outbound.ts responsesJsonToChatCompletion - 현재 dev는 incomplete를 전부 length로 뭉개고, 스트림 합성은 content만 내보낸다. 이 PR이 finish reason·tool·reasoning·budget을 채운다 메인테이너의 판단이 필요한 지점
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Actionable comments posted: 2
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Inline comments:
In `@tests/responses/chat-json-sse-fallback.test.ts`:
- Line 21: Update streamFixture so its upstream request validation accepts both
streaming and non-streaming modes, matching the stream flag derived from
delivery.jsonFinish. Preserve the existing streaming behavior while allowing
non-streaming JSON cases to reach the handler.
- Line 52: Update the response assertion in the fallback test to parse the JSON
body once, then verify the expected error fields and that both success payload
fields, choices and data, are absent.
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src/chat/outbound.tstests/responses/chat-json-sse-fallback.test.ts
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Carry #3779 and cover incomplete terminal precedence and bounded serialization. Co-authored-by: Ingwannu <ingwannu@users.noreply.github.com>
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Summary
Preserve tools, reasoning, usage and terminal finish reasons when a streaming Chat request receives Responses JSON. Both native Chat and translated JSON fallbacks use the same serializer. Token-limit and content-filter incompletes retain their own finish reason even when tool output exists; unknown incomplete boundaries return a typed upstream error.
Carry and extend #3779. Closes #3770.
Co-authored-by: Ingwannu 186453546+Ingwannu@users.noreply.github.com
Verification
eff908e0f. Claude admission/persistence and diagnostic workflows received explicit independent security review. The Windows fixture changes also passed independent source review.--no-verify.4a759716a940595b999805be40d1514c100d63cf, containing all five layers plus deveff908e0f. All expected jobs completed successfully.f89b815090020f52089801b50f569a777bdfdc0a. Independent source interaction review passed. That track's 25-job CI verifies its own source; its initial watchdog failure remains recorded there.bf5ce1c3a0ada78f8e506334a82c64b525b859daadditionally passed remote Bun 1.4.0 typecheck, 541 tests across 11 relevant files, and the 425-page documentation build. This supplements the full cross-platform run at4a759716a; it is a focused combined-tree check, not a second complete platform matrix.Checklist
Manual review chain (integrate bottom-up)
devcodex/track2-protocol-foundationcodex/track2-canonical-effortscodex/track2-refusalcodex/track2-claude-compatibilityMaintainer integration decision: @lidge-jun explicitly integrates this PR into
devunder MAINTAINERS.md at head723e59e65814ffac648a9f5ad1043e5c8823d1fd, using the final-head-first verification above and the authorized admin merge. This is maintainer integration, not a self-approval. Lower skipped checks are not passing evidence. Actor, base, head and review state are refreshed before merging.Landing confirmed: included in dev
5759d9ea2f1e7281cdc01eb9628f2e0a123fb59c. All five PR heads are ancestors of fetched dev. Final treeeb4473dfe9e6b95072e3eb31901df635c73dd0ebexactly equals the remotely checked combined source. #3806 was integrated with #3808; GitHub records both as merged.