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fix(combo): retry zero-output response.incomplete with no reason - #7317
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A combo target that ends with `response.incomplete` before any output and without `incomplete_details.reason` was accepted as the turn's answer, so the caller got an empty incomplete turn instead of failover to the next target. Treat a missing reason like the transport reasons already listed; semantic reasons such as max_output_tokens still commit the target. Co-Authored-By: Claude Code <noreply@anthropic.com>
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: retrying zero-output response.incomplete events when no reason is provided.
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Review comments at @tests/routing/combo-stream-preflight.test.ts:
- Around line 119-130: Add a server-level combo-dispatch regression case
alongside the existing preflight test: have target a return a zero-output
response.incomplete with no stated reason, then have target b return a
successful response. Assert that dispatch tries targets in order and returns
target b’s fallback response.
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📒 Files selected for processing: 2
src/server/responses/combo-stream-preflight.tstests/routing/combo-stream-preflight.test.ts
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Intake/scoped review at The new undefined-reason arm is confined to a zero-output response.incomplete; explicit semantic incomplete reasons remain outside the retry set. Keep the existing post-output commitment controls so the new fallback cannot duplicate emitted text/tools. The fixture covers omitted details and null incomplete_details, not universal incomplete replay. Current-head functional workflows are awaiting fork approval; that is pending execution, not a passing test result. No local suite was run for this branch in this intake. No workflow approval, new scan, live configuration change or merge was performed. Required review/readiness gates remain in force. |
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Thank you @vadymhimself! This fix is absorbed into #7355 with your commit and authorship intact. I verified the regression red-first against current |
) (#7355) * fix(combo): retry zero-output response.incomplete with no reason A combo target that ends with `response.incomplete` before any output and without `incomplete_details.reason` was accepted as the turn's answer, so the caller got an empty incomplete turn instead of failover to the next target. Treat a missing reason like the transport reasons already listed; semantic reasons such as max_output_tokens still commit the target. Co-Authored-By: Claude Code <noreply@anthropic.com> * fix(combos): hold the turn lease across the failover ladder Each combo child relay binds the turn admission lease to its own controller and unbinds it when its stream ends; the lease releases once nothing is bound. When target 1 returned 200 SSE and then failed before output, the combo cancelled that relay, its unbind released the parent's lease, and target 2 was aborted on bind with "turn already settled" (502). handleComboResponses now binds its own controller for the whole ladder and unbinds it on return. The accepted child's stream is bound before that, so it keeps the lease until it ends. Co-Authored-By: Claude Code <noreply@anthropic.com> * fix(responses): count Combo recovery sends in the shared send budget * fix(responses): preserve reserved Anthropic pool recovery sends * test(adapters): assert exact combo cooldown rejection and single refund * fix(combo): log the upstream refusal reason on combo target failure The combo hop warning printed only `<target> failed with 401 after Nms`, so a revoked credential or plan downgrade logged hundreds of identical lines that read like a provider outage. Append the upstream error code and parsed message (falling back to the normalized body text), collapsed to one line, redacted and capped at 200 characters via sanitizeLogMetadataString. Co-Authored-By: Claude Code <noreply@anthropic.com> * fix(combo): log only the parsed upstream code and message on a hop failure Drop the classificationText fallback so an unparsed upstream body never reaches the warning line; the log boundary is now the two parsed fields. Co-Authored-By: Claude Code <noreply@anthropic.com> * fix(combo): redact failure fields before flattening log metadata Preserve credential framing until the shared redactor has removed credential values. Cover multipart framing in a parsed upstream code at the actual combo hop warning boundary. Co-authored-by: Vadym O <bolein95@gmail.com> * fix(combo): retain output carried by reasonless incomplete snapshots A terminal-only upstream can include text or tool items in its final snapshot. Keep that response committed, and cover explicit semantic/unknown reasons and output-first streams as well. Co-authored-by: Vadym O <bolein95@gmail.com> * fix(combo): unbind only registered turn lease controllers Match registerTurn capability checks for plain admission leases so the ladder does not report a spurious release miss. Add accepted fallback stream completion, cancellation and caller-abort coverage with exactly-once attached lease settlement. Co-authored-by: Vadym O <bolein95@gmail.com> * docs(combo): describe incomplete, lease and recovery-budget boundaries * docs(structure): split combo streaming boundaries within the line budget --------- Co-authored-by: Vadym O <bolein95@gmail.com> Co-authored-by: Claude Code <noreply@anthropic.com> Co-authored-by: Epinephrine <luvs01@hanmail.net>
Summary
response.incompletebefore emitting any output, and whoseincomplete_details.reasonis absent (noincomplete_details, orincomplete_details: null), was accepted bypreflightComboStreamResponseas the final answer. The caller received an empty incomplete turn and the combo never failed over to its next target.retryableZeroOutputTerminalnow treats a missing reason the same way as the transport reasons already listed (adapter_eof,missing_terminal_event,upstream_stall_timeout). Semantic reasons such asmax_output_tokensandcontent_filterstill commit the target, and incompletes after output has started are unchanged.src/server/responses/combo-stream-preflight.ts, plus one regression test intests/routing/combo-stream-preflight.test.ts.Verification
converts a zero-output incomplete without a stated reason into a retryable failure, run before the src change:bun test tests/routing/combo-stream-preflight.test.ts-> 26 pass, 1 fail (Expected: "failed",Received: "accepted"). After the change: 27 pass, 0 fail.bun test tests/routing/combo-stream-preflight.test.ts tests/routing/combo-terminal-refusal.test.ts tests/responses/responses-core-modules.test.ts tests/adapters/adapter-error-inline.test.ts-> 54 pass, 0 fail.bun x tsc --noEmit-> exit 0.bun run test:changed(Bun 1.4.3 viaOCX_TEST_RUNNER_BUN) -> 15937 pass, 34 skip, 1 fail. The single failure,tests/cli/cli-connect-readiness.test.ts"a rejected preferred runtime falls back without rewriting the saved selection", fails identically on an unmodifiedupstream/dev8640c2f checkout on this machine (local-environment dependent) and does not touch the combo preflight.bun run testwas not run locally:test:changedalready covered 639 files through the import graph of the changed module; the remainder is left to CI.Checklist
Source: carried from the vadymhimself fork build (port commit 8fb1bbb, combo-stream-preflight hunk).
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