fixes responses sse item null regression - #6395
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WalkthroughThe Responses stream schema omits nil ChangesResponses stream serialization
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The change corrects Responses SSE payloads by omitting unset fields while preserving valid item data and explicit empty arrays. Regression coverage exercises these behaviors, leaving no merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@tests/e2e/api/collections/provider-harness.json`:
- Around line 398-400: Update the output-item event validation in the provider
harness so response.output_item.added and response.output_item.done events are
included rather than excluded. For every such event, require an item property
whose value is a non-null object, and retain the existing failure
counting/assertion behavior for invalid events.
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Inline comments:
In `@tests/e2e/api/collections/provider-harness.json`:
- Line 405: Update the non-output event assertion in the provider harness to
reject any event containing an item property, regardless of its value, while
preserving the existing object validation for output-item events.
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akshaydeo
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Thanks for this one, @ReStranger. The diagnosis is correct, the root cause is identified precisely, and the fix is at the right layer. I reproduced the defect against dev by marshalling BifrostResponsesStreamResponse.WithDefaults() directly:
response.created {"type":"response.created","sequence_number":0,"item":null,"logprobs":null,"extra_fields":{...}}
response.output_text.delta {"type":"response.output_text.delta","sequence_number":0,"item":null,"logprobs":[],"extra_fields":{...}}
response.completed {"type":"response.completed","sequence_number":0,"item":null,"logprobs":null,"extra_fields":{...}}
response.output_item.added {"type":"response.output_item.added","sequence_number":0,"item":{"id":"msg_1",...},"logprobs":null,...}
So "item": null really is on the wire for every event, and omitempty is the correct minimal fix. I traced the path to confirm the fix lands: transports/bifrost-http/integrations/openai.go:528-539 calls resp.WithDefaults() and transports/bifrost-http/integrations/router.go:3067 does sonic.Marshal on that struct, so the schema tag is what the client sees. I also confirmed the change is safe in-process: every Go reader of Item nil-checks it (framework/streaming/responses.go:61, transports/bifrost-http/integrations/cursor.go:118, the provider files), and absent and null both decode to nil.
Four things need attention before this can merge: the PR targets the wrong base branch, the new harness assertion fails deterministically, the sibling logprobs field has the identical defect and is left behind, and the harness case duplicates coverage that already exists for every provider.
Findings
| # | Severity | Location | Finding | Verdict |
|---|---|---|---|---|
| 1 | Blocking | PR base branch | Targets main; contributor PRs must target dev |
CONFIRMED |
| 2 | High | provider-harness.json:409 | .to.be.defined is not a Chai property; the assertion throws, so the case always fails |
CONFIRMED |
| 3 | Medium | core/schemas/responses.go:3733 | logprobs has the identical nil-serializes-null defect and is not fixed |
CONFIRMED |
| 4 | Medium | provider-harness.json:370 | New openai-only case duplicates the existing all-provider streaming folder | CONFIRMED |
| 5 | Low | core/schemas/responses_test.go:44 | Substring assertion depends on Go struct field declaration order | CONFIRMED |
1. Blocking: wrong base branch
gh pr view 6395 --json baseRefName returns main. Every other open contributor PR in the repo (6436, 6435, 6420, 6414, 6407, 6405, 6402, 6397, 6393, 6392, 6378, ...) targets dev, and docs/contributing/raising-a-pr.mdx:10 states it directly:
Fork the repository and create a feature branch from
dev(the default development branch;mainis reserved for releases). Targetdevwhen opening your PR.
Merging into main would land the change outside the normal release flow and it would be reverted on the next release merge. Please retarget the PR to dev (GitHub's "Edit" button next to the title lets you change the base without reopening) and rebase onto dev if needed. Everything else in this review is straightforward to fix, so this is the only structural blocker.
2. High: pm.expect(...).to.be.defined throws in the Postman sandbox
pm.expect(types['response.created'], 'expected response.created').to.be.defined;Chai has no defined property. Chai 4 and later ship proxy protection that turns an unknown property access into a thrown error rather than a silent no-op. Reproduced locally with the Chai in this repo's ui/node_modules:
> expect(1).to.be.defined
THREW: Invalid Chai property: defined. Did you mean "undefined"?
Failure scenario: the harness runs against a perfectly correct stream, response.created and response.completed are both present, and the test Responses stream emits response.created and response.completed still fails with Invalid Chai property: defined. The regression case then reports red for a reason unrelated to the regression it guards, which is worse than no case at all. Nothing else in provider-harness.json uses .to.be.defined; the collection's own convention is explicit boolean or numeric assertions.
Suggested fix:
pm.expect(types['response.created'], 'expected response.created').to.not.be.undefined;
pm.expect(types['response.completed'], 'expected response.completed').to.not.be.undefined;or, matching the style used elsewhere in the collection, pm.expect(types['response.created'] || 0).to.be.above(0).
3. Medium: logprobs has the same defect and is left behind
core/schemas/responses.go:3733:
LogProbs []ResponsesOutputMessageContentTextLogProb `json:"logprobs"`Same mechanism, same wire surface: on response.created, response.completed, response.output_item.added and every other event that is not output_text.delta / output_text.done, WithDefaults leaves the slice nil and the frame carries "logprobs": null. That is visible in the probe output at the top of this review.
Per OpenAI's own published types, ResponseCreatedEvent carries exactly three fields, response, sequence_number, type, with no logprobs and no item: https://github.com/openai/openai-python/blob/main/src/openai/types/responses/response_created_event.py . So logprobs: null on that event is off-spec for the same reason item: null is.
Whether it also trips the opencode validator depends on how that client's per-event schema is written, and neither the PR nor #6394 quotes the client-side error text, so I cannot say for certain that fixing item alone unblocks the reported user. If you have the exact validator message from @opencode-ai/ai/providers/openai, pasting it into the issue would settle that quickly.
One trap worth calling out so nobody "fixes" this the obvious way: logprobs must NOT simply get omitempty. WithDefaults deliberately backfills [] for output_text.delta / output_text.done (core/schemas/responses.go:3838-3841), and omitempty drops empty slices too, so it would delete a field that OpenAI marks required on that event (logprobs: List[Logprob], required, https://github.com/openai/openai-python/blob/main/src/openai/types/responses/response_text_delta_event.py ). The correct shape is either a *[]ResponsesOutputMessageContentTextLogProb with omitempty, or emitting the key only for the event types that define it.
Same observation, lower confidence on intent: extra_fields is emitted on every SSE frame on the OpenAI-compatible surface and is not part of the Responses spec either. That one may well be deliberate for Bifrost's own superset surface, so I am flagging it as a question rather than a defect.
Happy to see logprobs handled in this PR since it is three lines next to the change you already made, but a follow-up PR is fine too if you would rather keep this one minimal. Please do not leave it unfiled either way.
4. Medium: the harness case duplicates all-provider coverage that already exists
The new case is added under 1. Native Bifrost API and pinned to openai/gpt-4o-mini. The collection already has:
- Folder
8. Criss-Cross ... / 8.2 Text Chat (streaming), which carries a folder-leveltestscript that runs for every case beneath it (content-type check plus stream-terminator check). - Folder
8.2.B Native /v1/responses streaming x all providers, with one streaming/v1/responsescase per provider: openai, anthropic, gemini, vertex, bedrock, bedrock_mantle, azure, deepseek.
Because Item lives on the shared BifrostResponsesStreamResponse, this regression affects every provider that streams Responses, not just OpenAI. Moving the item-null scan into the 8.2 folder-level script gives you the whole provider matrix for free, catches a per-provider converter that reintroduces the field, and avoids adding one more billed OpenAI call to every harness run. It also removes the duplicated content-type assertion, which is already covered twice: by the 8.2 folder script and by streamingTest in tests/e2e/api/runners/augment-provider-harness.mjs:43-51.
The if (pm.response.code >= 400) { return; } guard you used is correct and matches the existing 8.2 script, so that part is good.
5. Low: unit-test assertion depends on struct field order
if !strings.Contains(string(encoded), `"item":{"id":"msg_1"`) {MarshalSorted is sonic.ConfigStd, which sorts map keys but not struct fields, so this passes only because ID happens to be the first field declared on ResponsesMessage (core/schemas/responses.go:1462). I verified it passes today. It will break on an unrelated field reordering, with an error message that points at item loss rather than at the real cause. Decoding into a map[string]any and asserting m["item"].(map[string]any)["id"] == "msg_1" would be equally short and order-independent.
Merge recommendation
Not yet - request changes. Finding 1 blocks mechanically: the change cannot land on main. Finding 2 makes the new harness case fail on every run, so the regression guard this PR adds would not do its job. Findings 3, 4 and 5 are quality issues, not correctness regressions in the shipped fix.
Followups required
- In this PR (blocking) - Retarget the PR base from
maintodevand rebase if needed. Reference:docs/contributing/raising-a-pr.mdx:10. - In this PR (blocking) -
tests/e2e/api/collections/provider-harness.json:409-410: replace.to.be.definedwith.to.not.be.undefined(or.to.be.above(0)), so the case can pass. - In this PR (blocking) -
tests/e2e/api/collections/provider-harness.json:370: move the item-null scan into the8.2 Text Chat (streaming)folder-level test script and drop the standalone openai-only case, so all providers are covered and the content-type assertion is not triplicated. - In this PR, or a follow-up PR if you prefer -
core/schemas/responses.go:3733: stop emitting"logprobs": nullon events that do not define it, using a pointer slice or event-scoped emission rather than plainomitempty(which would drop the required[]onoutput_text.delta/output_text.done). - Follow-up PR - Decide whether
extra_fieldsbelongs on the OpenAI-compatible/v1/responsesSSE surface at all, or only on Bifrost's native superset surface. - Nit, this PR -
core/schemas/responses_test.go:44: assert on the decoded JSON rather than a byte-order-dependent substring.
Checked and cleared (refuted candidates)
omitemptybreaks in-process consumers ofItem. Refuted: every reader nil-checks (framework/streaming/responses.go:61,transports/bifrost-http/integrations/cursor.go:118,core/providers/gemini/responses.go:919, and the rest), and on decode an absent key and an explicit null both producenil.- A golden fixture or snapshot asserts
"item": null. Refuted: a repo-wide search for"item":nulland"item": nullacross Go, JSON, TS and TSX returns no matches. - The new test needs a
stringsimport that is not added. Refuted:core/schemas/responses_test.go:5already importsstrings. returnat the top level of a Postmanexecscript is invalid. Refuted: the existing8.2folder-level script uses the sameif (pm.response.code >= 400) { return; }guard.- The OpenAI raw-passthrough branch means the fix never runs. Refuted:
transports/bifrost-http/integrations/openai.go:529-533short-circuits only whenExtraFields.RawResponseis populated; the default path falls through toWithDefaults()and marshals the Bifrost struct. - The test's
"item"substring check could false-match"item_id". Refuted: the needle includes the closing quote, so"item_id"does not match. - The
--feature "item:null"selector in the PR description will not match the new case. Refuted:filter-collection.mjs:45lowercases and substring-matches the item name path, and the case name containsitem:null.
Thanks again for the clean diagnosis, the reproduction steps, and for adding both a unit test and a harness case. Once the base branch is corrected and the Chai assertion is fixed, this is a good change.
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4 participants
Summary
Fixes a Responses SSE compatibility bug where Bifrost serialized
"item": nullon stream event types that do not carry an item payload.Strict OpenAI Responses clients such as
@opencode-ai/ai/providers/openaireject these events as invalid stream frames, which breaks streamed/v1/responsesusage even though the event should simply omit theitemfield.Changes
core/schemas/responses.gosoBifrostResponsesStreamResponse.Itemusesjson:"item,omitempty"response.output_item.addedandresponse.output_item.donemust still emit the item objectPOST /v1/responsesthat validates:output_item.added/output_item.donecontainsitem: nullNotable design decision:
Type of change
Affected areas
How to test
Validate the schema-level regression test:
Expected outcome:
github.com/maximhq/bifrost/core/schemaspassesValidate downstream streaming helpers still pass:
Expected outcome:
github.com/maximhq/bifrost/framework/streamingpassesValidate the provider-harness collection remains structurally valid and includes the new regression case:
node tests/e2e/api/runners/augment-provider-harness.mjs \ --source tests/e2e/api/collections/provider-harness.json \ --out /tmp/provider-harness-augmented.json node tests/e2e/api/runners/filter-collection.mjs \ --source /tmp/provider-harness-augmented.json \ --out /tmp/provider-harness-item-null.json \ --feature "item:null"Expected outcome:
Optional end-to-end validation against a running deployment:
Expected outcome:
response.created,response.in_progress,response.output_text.delta, andresponse.completeddo not contain"item": nullresponse.output_item.added/response.output_item.donestill includeitemNo new configs or environment variables were added.
Screenshots/Recordings
N/A
Breaking changes
If yes, describe impact and migration instructions.
Related issues
Related:
Security considerations
No security impact. This change only adjusts Responses SSE serialization for schema correctness.
Checklist
docs/contributing/README.mdand followed the guidelines