fix(responses): keep the whole Response object on the non-streaming path - #965
fix(responses): keep the whole Response object on the non-streaming path#965SantiagoDePolonia wants to merge 6 commits into
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📝 WalkthroughWalkthroughThe Responses API now validates missing input locally, preserves unknown response fields, echoes supplied request fields for translated providers, supports disabled truncation, and documents these compatibility behaviors. Tests and golden fixtures cover response fidelity, validation, streaming, and provider behavior. ChangesResponses API fidelity
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Chat-translated responses can omit caller-supplied fields such as frequency and presence penalties. This compatibility regression should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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| // "disabled" is OpenAI's default and asks for nothing, so it is honored by | ||
| // doing nothing. Only "auto", which asks the provider to drop input that | ||
| // does not fit, cannot be translated. | ||
| if truncation := strings.TrimSpace(req.Truncation); truncation != "" && truncation != "disabled" { |
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Whitespace-padded truncation values such as " disabled " are accepted after trimming, but the translated response echoes the original padded value. This returns a value outside the accepted truncation enum and can make strict Responses clients reject an otherwise successful response. Either reject non-canonical input or echo the canonical "disabled" value. This is non-blocking, but it creates an avoidable compatibility cost.
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Fixed: the echo now carries the canonical spelling the validator accepted, so a padded " disabled " comes back as "disabled". Added a test.
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Inline comments:
In `@internal/providers/responses_echo.go`:
- Line 24: Update ResponsesRequestEcho and its JSON echo handling to preserve an
allowlist of echoable ExtraFields, including fields such as frequency_penalty
and presence_penalty, so ResponsesViaChat and StreamResponsesViaChat retain
them. Add coverage for decoding, non-streaming responses, and terminal streaming
responses.
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📒 Files selected for processing (16)
docs/advanced/responses-api.mdxdocs/advanced/responses-compatibility.mdxinternal/core/responses.gointernal/core/responses_fidelity_test.gointernal/core/responses_json.gointernal/providers/anthropic/responses.gointernal/providers/responses_adapter.gointernal/providers/responses_converter.gointernal/providers/responses_echo.gointernal/providers/responses_echo_test.gointernal/providers/responses_truncation_test.gointernal/server/responses_fidelity_test.gointernal/server/translated_inference_service.gointernal/streaming/assemble.gotests/contract/testdata/golden/openai/responses.golden.jsontests/contract/testdata/golden/xai/responses.golden.json
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The non-streaming
/v1/responsesanswer used to be re-serialized from a structwith only ten members, so
instructions,metadata,tools,tool_choice,parallel_tool_calls,temperature,top_p,store,text,reasoningandtruncationwere dropped —metadatawas write-only, and the object shapeflipped with
stream.ResponsesResponsenow keeps unknown members in anUnknownJSONFieldspassthrough (likeResponsesOutputItemalready did), so anative provider's object is relayed whole, on create and on
GET /v1/responses/{id}. Chat-translated providers have no upstream object, sothey echo the members the caller supplied — on the streamed path too, which was
equally bare — and only those: a default invented here would describe OpenAI's
behaviour rather than the provider's.
Also:
truncation: "disabled"(OpenAI's documented default and a no-op) is acceptedon chat-translated providers instead of being rejected with a 400;
"auto"still is. Those compatibility errors now carry
param.nullinputis answered locally with OpenAI'smissing_required_parametererror instead of reaching the provider as{}and coming back as a confusing upstream error. A
prompttemplate is exempt.Interaction with #955 — handled here, merge order does not matter
#955 adds a typed
incomplete_detailsmember withomitempty. On its own thatis correct; combined with this PR's passthrough it silently dropped an
upstream's explicit
incomplete_details: null, because the member stops beingunknown and the nil typed value is then omitted.
make test-contractfailed onthe OpenAI and xAI Responses goldens with both branches merged.
ResponsesResponse.UnmarshalJSONnow retains an explicitly receivedincomplete_details: nullas an extra, so the null survives whether or not thestruct types the member, and a populated value is still emitted once from the
typed field. Verified by merging both branches into a scratch branch: without
the fix
TestOpenAIReplayResponsesandTestXAIReplayResponsesfail on themissing member, with it
make test-contractpasses. #955 needs no change andthe two can land in either order.
Tested: table-driven unit tests in
internal/core,internal/providersandinternal/server; live againstopenai/gpt-4.1-mini(native),anthropic/claude-haiku-4-5andgemini/gemini-2.5-flash(translated) —asserted field by field that the non-streaming object now matches the streamed
one on all three, and that
metadataround-trips throughGET /v1/responses/{id}after both a streamed and a non-streamed create.Summary by CodeRabbit
New Features
truncation: "disabled"option is now accepted for chat-translated Responses requests.Bug Fixes
inputandpromptnow receive an OpenAI-compatible validation error before provider processing.truncationvalues now identify the offending field in error details.Documentation