fix(responses): include output array in streamed response.completed - #831
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📝 WalkthroughWalkthroughStreaming ChangesCompleted response output
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The PR restores terminal output for translated streams, but truncated tool calls may still be reported as completed and tool-first streams may produce inconsistent output ordering between streamed items and the final response, potentially persisting incomplete or reordered exchanges. These concrete correctness risks should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant StreamConverter
participant ResponsesOutputEventState
participant ResponseCompleted
StreamConverter->>ResponsesOutputEventState: FinalOutputItems()
ResponsesOutputEventState-->>StreamConverter: ordered finalized items
StreamConverter->>ResponseCompleted: emit response.output
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description clearly explains what changed, why it changed, affected providers, unchanged passthrough providers, performance impact, regenerated goldens, and test coverage. It satisfies the required Description section; the optional AI Generated section is not required. Full details: Docstring CoverageExplanation Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 6 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Actionable comments posted: 3
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Inline comments:
In `@internal/providers/anthropic/responses.go`:
- Line 181: Update the response completion flow around FinalOutputItems and
response.completed so tool calls that have not received content_block_stop are
finalized before completion, or completion is deferred until message_stop.
Ensure incomplete calls are not emitted with status completed, and add a test
covering a stream truncated at EOF before content_block_stop.
- Line 181: Update the output-index allocation around FinalOutputItems so the
assistant output index is reserved before assigning indexes to tool calls,
ensuring tool-first streams retain event order without duplicate index 0 values.
Add a regression test covering a tool_use block before the first text_delta and
verify the resulting assistant/tool ordering.
In `@internal/providers/responses_converter_test.go`:
- Line 355: Update the assertion in the reasoning-content test around
reasoningContent to also verify that the normalized part’s type is exactly
"reasoning_text", while preserving the existing text assertion.
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📒 Files selected for processing (9)
internal/providers/anthropic/anthropic_test.gointernal/providers/anthropic/responses.gointernal/providers/responses_converter.gointernal/providers/responses_converter_test.gointernal/providers/responses_output_state.gotests/contract/testdata/golden/anthropic/responses_stream.golden.jsontests/contract/testdata/golden/gemini/responses_stream.golden.jsontests/contract/testdata/golden/groq/responses_stream.golden.jsontests/perf/hotpath_test.go
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Confidence Score: 4/5Not merge-safe until interrupted tool calls can no longer be presented as completed invocations. There is one verified non-security P1 finding, which yields a confidence score of 4. Files Needing Attention: internal/providers/anthropic/responses.go
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Reviews (2): Last reviewed commit: "fix(responses): finalize open items befo..." | Re-trigger Greptile |
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Only tool calls whose output_item.done was emitted appear in the terminal output; the Anthropic converter now closes items left open at EOF and tracks the assistant output index instead of hardcoding 0, so tool-first streams keep stream order.
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| var out strings.Builder | ||
| for _, index := range indices { | ||
| out.WriteString(sc.output.CompleteToolCall(sc.toolCalls[index], true)) |
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When an Anthropic stream ends before content_block_stop, this loop completes every retained tool call, including calls whose argument JSON is incomplete. The converter consequently emits response.function_call_arguments.done and response.output_item.done with status: "completed" for truncated input such as {"city":"War. Downstream consumers can then parse, persist, or dispatch an incomplete invocation as though it were valid.
Artifacts
EOF partial tool harness source
- A temporary Go test creates an HTTP SSE stream ending immediately after a partial tool JSON delta and asserts the required emitted events and payloads, demonstrating the focused execution scope.
EOF partial tool harness output
- The focused Go harness ran against the current converter, exited 0, and verified arguments.done, completed output_item.done, and response.completed ordering with retained partial arguments.
Existing truncated tool test output
- The repository's existing truncated-tool-call EOF test ran against the same current behavior and exited 0, corroborating that open tool calls are finalized at stream EOF.
2 participants
OpenAI's native Responses API includes the full
outputarray in the terminalresponse.completedevent, but GoModel's translated streams (Anthropic native, and every chat-translated provider via the shared converter: Gemini, Groq, DeepSeek, etc.) omitted it. Strict SDK consumers that index intoresponse.outputcrash on the streamed path even though the non-streaming path works — same class of breakage as the annotations fix (#807). It also broke conversation persistence for translated streams, which readsresponse.outputfrom the terminal event and was saving empty exchanges.The terminal event now carries the completed output items (reasoning, assistant message, function calls) in output-index order, rendered by the same code that produces the
response.output_item.doneevents, so the final array always matches what was streamed. Empty streams yieldoutput: [], consistent withresponse.failed.OpenAIResponsesStreamConverter; native OpenAI/Azure/xAI passthrough streams are unchanged.Summary by CodeRabbit