Reasoning output semantics: preserve or fail closed (D-062, #158) #160
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Delete branch "translation/reasoning-output-semantics"
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Closes #158 when merged (issue stays open until human review completes; agents never merge). Decision record: D-062 in
docs/decisions.md(D-060 is reserved by open issue #156, D-061 by open PR #157).Defect reproduced (on canonical
develop@6fec46ca…, before any change)The OpenAI-compatible translation core accepted reasoning controls on requests (D-055) but had no normalized representation for provider reasoning output. A backend could return reasoning and Scarcity Router answered 200 with it silently discarded — in BOTH transports that share the core (server-direct HTTP, worker-loopback). Probe on the base:
Semantic contract chosen
AdapterMessage.reasoning: str | None(bounded 16 MiB, the content bound) on the assistant result; new closed stream-chunk kindreasoning_delta(bounded 1 MiB liketext_delta). Reasoning is opaque provider output: never parsed, never routed on, never telemetry, never merged into content, never a tool call.reasoning_output_policy∈ {none,reasoning_content,reasoning}. The preset decides which response shape its evidence documents. Known reasoning-output field names (reasoning_content,reasoning,reasoning_details) in a response are either the evidenced mapping or typed protocol drift — never tolerated-unknown, never flattened, never stringified, never auto-detected.choices[0].message.reasoning_content(non-streaming) andchoices[0].delta.reasoning_content(streaming) — present only when reasoning was preserved (absence stays absence). Ordinary responses are byte-identical; the coordinator stays provider-free; no provider branches outside the translation policy.Providers / shapes evidenced (official docs re-retrieved 2026-09-28)
message.reasoning_content(string nullable, thinking mode)delta.reasoning_contentreasoning_contentmessage.reasoning_content(GLM-4.5 series; coding parity PARTIAL as before)reasoning_contentmessage.reasoning(reasoning_content= documented identical alias; conflicting values fail closed)delta.reasoningreasoningnone(presence = typed drift)Structured
reasoning_details(OpenRouter) is typed drift under every policy — never flattened, deliberately unrepresented.Normalized seam changes
gateway_adapters.py(AdapterMessage.reasoning,CHUNK_REASONING_DELTA),openai_http_core.py(_extract_reasoning, policy fact, strict typing, request-history refusal),openai_http_adapter.py(reasoning accumulation + emission, server-direct),worker_local_translation.py/worker_local_adapters.py(worker-loopback, same core),gateway_openai.py/gateway_server.py(rendering + synthesis),worker_protocol.py(v3).Public response shape
reasoning_contentis the ecosystem-standard name: defined natively by DeepSeek and Z.ai; documented by OpenRouter as an identical alias ofreasoning; LiteLLM's normalized representation is exactlyreasoning_content(withdelta.reasoningcanonicalized into it). The gateway never leaks the upstream field name variant to the client.Streaming behavior
Reasoning deltas stay a distinct normalized kind in provider arrival order (reasoning before text within one frame); fragmentation correctness is inherited from the authoritative SSE parser (untouched); no full-stream buffering of reasoning. Tested with reasoning split at arbitrary byte boundaries including mid-UTF-8 codepoints.
History / round-trip decision
Response-only. No supported preset evidences reasoning re-injection (DeepSeek's input form is a beta base-URL-only feature; OpenRouter's is its own router facility). Ingress keeps its closed message key set — an echoed
reasoning_contentis the existing typedunknown_parameter400. The request builder refuses a dispatch carryingmessage.reasoningrather than silently dropping it.Reuse decision
1ceeefbf(MIT),litellm/types/utils.py: normalizedreasoning_contenton message/delta;reasoning→reasoning_contentcanonicalization — ADOPT the semantics, not the code (pydantic idioms do not fit the stdlib core).4a2c8186(MIT),internal/thinking/summary.go+ translators — corroborates keeping provider reasoning knowledge at the translation edge; no reuse.Security / privacy result
Reasoning text flows only through the bounded execution response path. It never enters logs, the SQLite audit store (records structurally cannot carry content — marker-scanned in e2e), error messages (drift errors name parameter structure, never values), diagnostics, routing state or persistence. Worker protocol v3 (one optional bounded
reasoningmember; server accepts v1/v2/v3; unrepresentable evidenced reasoning fails closed worker-side, never silently drops). Not classifiedsecurity_critical: no credential, transport, auth or exposure change.Tests
New
tests/test_reasoning_output_semantics.py(55 tests): policy vocabulary; non-streaming preservation/drift matrix (8+ cases incl. wrong types, alias conflict, structured drift, unevidenced null, reasoning-only, reasoning+tools, empty-string absence); streaming matrix (9 cases); fragmented SSE incl. mid-UTF-8 splits; normalized seam round trips (worker protocol message + chunk); gateway rendering (present-only semantics, one public field); loopback translation; tool-call interaction (6 cases — accumulator guarantees intact); privacy (structural errors, audit scan). Composed e2e: server-direct preservation (non-streaming + streameddelta.reasoning_contentframes), unevidenced drift → 502backend_failurewith no content leakage, ordinary-client byte-compat, and worker-loopback parity through the full composed path (preservation + drift fail-closed). Full gate on this exact head:uv sync --only-devOK;make checkgreen in one run — 2247 tests OK,uv run basedpyright0 errors/0 warnings/0 notes;git diff --checkclean. One intermittent full-suite failure observed during development was the documented pre-existing #143 load-sensitive cancel-assert race (passes in isolation, 3 subsequent full runs green, path untouched).Explicit non-goals (unchanged, per issue #158)
Z.ai
CREDIT_LIMIT; worker chunk-buffer hardening; HTTP transport changes; SSE parser replacement; invalid-UTF-8 typing cleanup; Responses API; Anthropic Messages; new providers; Codex schema automation; client-owned tool execution; generic content-block abstractions; structuredreasoning_detailsrepresentation; the Codex (M06) adapter'sitem/reasoning/*summary handling (separate protocol/evidence path, recorded as adjacent observed behavior, unchanged); the #150 deferred items.UX impact: positive and additive — reasoning-capable backends no longer silently lose reasoning; clients that ignore the new field see byte-identical responses; drift produces actionable typed failures instead of invisible semantic loss. No removed behavior; no new required configuration.
Per repository governance: PR left open for human review; workers never merge.
Independent exact-head review — round 1 (reviewed head
247e264)Fresh independent adversarial review (GLM-5.3-Flash agent, isolated context, read-only, exact PR head) against the mandatory 12-point checklist: APPROVE, no BLOCKERs, three SHOULD_FIX, four DEFER.
SHOULD_FIX (remediated in
7390277):test_reasoning_content_is_tolerated_and_ignoredstill described the defect semantics by name with a content-only assertion (would NOT catch a regression to silent drop) → re-purposed totest_reasoning_content_is_preserved_not_ignored, pinning preservation and documenting its own history.gateway_server._synthesize, reasoning before content for a chunkless streaming completion) was untested → newtest_chunkless_reasoning_synthesizes_reasoning_before_content(+chunkless_behavior(reasoning=...)fixture param).reasoning_contentin history →unknown_parameter) was structurally guaranteed but unpinned →test_echoed_reasoning_output_is_unknown_parameterpins code + exactparam.DEFER (with reasons):
4. Rolling-upgrade window: a pre-v3 worker against the new server keeps the old silent-drop behavior on worker-bridged resources until upgraded (documented in
docs/worker-protocol.mdv3 section; server-direct resources are fixed server-side immediately) — inherent to worker-side defect fixes; release notes should carry one sentence.5. OpenRouter backends emitting
reasoning_detailsalongsidereasoningfail closed on every reasoning call — the explicit documented D-062 tradeoff (structured shapes are never silently discarded); a superseding decision can map them later.6. Pre-existing single-frame bound mismatch (8 MiB SSE frame vs 1 MiB chunk text → untyped
ValueErroron a >1 MiB single delta) — identical exposure existed fortext_deltabefore this change; no new failure class; out of scope (#158 non-goal).7. Operator diagnosability of drift: the client sees the uniform opaque 502
backend_failure(privacy-first by design); operators distinguish a preset/schema drift only by reproducing it — changing that surface is a separate contract decision.Checklist: all 12 points PASS (silent-loss trace across both transports and all four code paths; non-streaming/streaming preservation; tool-call accumulator intact; ordering incl. tool-call index accounting; wire compatibility incl. byte-identical ordinary responses and v1/v2 peer acceptance; seam cleanliness — no provider branches outside the policy; fail-closed matrix; privacy — audit SQLite marker-scanned, structural error messages only; D-043/D-055/D-058/#151 untouched; test honesty verified against base
6fec46ca). UX impact assessed: low, mostly positive; recovery error actionability unchanged (generic 502), noted under DEFER 7.Gate observed by the reviewer at
247e264: 2247 tests OK (full suite), basedpyright 0/0/0. Gate on the remediation head7390277:make checkgreen in one run — 2249 tests OK, basedpyright 0 errors/0 warnings/0 notes,git diff --checkclean; the delta commit is tests-only.Narrow final verification of the remediation head follows per the bounded review lifecycle.
Final verification — remediation head
7390277Narrow final verification by the same independent reviewer: FINAL_VERIFICATION_PASS. All three SHOULD_FIX items closed exactly as specified (the re-purposed test fails on the old behavior two ways — AttributeError on the pre-D-062 seam, equality failure on any drop regression; the synthesis test pins the exact ordered sequence over real SSE frames; the echo test pins code + exact
param). The delta commit is tests-only (git diff 247e264..7390277 -- scarcity_router/is empty); no test was weakened; the fixture change is additive. Reviewer's own gates on this head: 143 touched-module tests OK, basedpyright 0/0/0; full-suite gate on this head:make checkgreen — 2249 tests OK, basedpyright 0 errors/0 warnings/0 notes,git diff --checkclean. No new findings.State:
READY_FOR_OWNER_MERGE. Per governance the PR stays open for the human merge gate; workers never merge.Decision-number and worker-protocol collision with PR #159 — recorded for the human merge gate
While posting the review record, a parallel work stream surfaced: PR #159 (Codex client-tool continuation, #137, branch
gateway/codex-client-tools, created 2026-09-28 17:58 — earlier than this PR's 19:02, same develop base6fec46c) records its decision as D-062 using the same reservation logic this branch used (D-060 reserved by open #156, D-061 by open #157). Both branches therefore carry adocs/decisions.mdrecord numbered D-062 for DIFFERENT decisions. Additionally, both branches bumpWORKER_PROTOCOL_VERSIONto 3 with disjoint member sets: #159 adds theexecute_tool_call/execute_tool_resultmessage types; this PR adds the optional conversation-messagereasoningmember. The member sets themselves do not semantically overlap, but the two v3 sections indocs/worker-protocol.mdand the version constants will collide on merge.Per the D-057/D-058 precedent (PR #152), the resolution is: whichever PR merges second performs a whole-branch textual renumber (to the next free number, D-063 as of now) and reconciles the worker-protocol version section (either one combined protocol v3 carrying both disjoint additions, or a v4 bump for the later change — the merger's documented choice). Neither head renumbers now: both are frozen, reviewed, exact-head artifacts, and a textual renumber would invalidate the completed review records for no semantic change.
The owner should treat this comment as the conflict record required by AGENTS.md ("if documents conflict, record the conflict and resolve it explicitly"). Nothing else in this PR's semantics is affected.
Integration: current
developmerged in (D-062 ownership + worker protocol v4)Current canonical
develop@f79f452(merged PR #159: D-062 client-tool continuation, worker protocol v3) is now merged into this branch (--no-ff, owner-directed merge topology — not a rebase). New head:e4b4180(2 reviewed reasoning commits + mergec4c65c6+ integration commite4b4180).Decision reconciliation (verified against the freshly fetched ledger): D-062 is owned by merged #159 (client-tool continuation) and appears in
docs/decisions.mdexactly once, untouched. The reasoning decision is renumbered D-063 (verified free before renumbering; the D-057/D-058 renumber precedent), with a provenance note in the record. All #159 D-062 references are untouched; all reasoning references now say D-063.Worker protocol reconciliation — the two "v3" definitions were NOT merged:
execute_tool_call/execute_tool_result, version-gated, merged unchangedreasoningmember +reasoning_deltachunks, on top of the COMPLETE v3 semantics.WORKER_PROTOCOL_VERSION = 4;SERVER_SUPPORTED_PROTOCOL_VERSIONS = (4, 3, 2, 1).Negotiation honesty (the integration's central invariant): negotiation can never silently drop reasoning. (a) A
reasoningmember on a session that negotiated below 4 is a schema violation: the endpoint resolves the attempt failed with a structural note and answers a typed non-fatalmalformed_message— a v3 peer cannot carry v4-only semantics and no parser guesses. (b) A v4 worker holding a reasoning-bearing result under a negotiated version below 4 FAILS THE EXECUTION CLOSED (ensure_reasoning_representable, on the result-send path) — falling back to v3 can never silently lose reasoning. (c) v1/v2/v3 peers keep their exact existing semantics; a v3 session retains every D-062 continuation behavior.Combined D-062 × D-063 test matrix (new): endpoint version exactness (v4 preserves reasoning end-to-end; v3+reasoning → typed failure; v3-without-reasoning unaffected; v3-only handshake still negotiates exactly 3); worker-side gate units (below-4 fails closed, on-4 serializes, plain results unaffected, gate wired into
_result_message); bridged-adapter v4 test (areasoning_deltachunk stream + reasoning message cross a REAL negotiated-v4 session — reasoning arrives as its own kind, in order, before text); #159's full continuation suites and #160's reasoning suites all green on the combined head. Reasoning × tool-suspension: the D-062 suspension response (tool_calls) is unchanged and carries no fabricated reasoning; the Codex adapter produces no reasoning under current evidence (unchanged, documented in D-063's boundary); a continuation-leg result message can carry reasoning on v4 (covered by the endpoint v4 test).Preserved from #159 (verified, not "simplified"):
execute_tool_call/execute_tool_resultremain v3+ only; v1/v2 peers cannot emit them; the continuation seam (register_continuation,SuspensionHandle,ToolBridgeChannel, digest-only fingerprints, deadlines, sticky suspended turns, capability gating) is merged verbatim.Gate on the exact head
e4b4180:make checkgreen in ONE run — 2388 tests OK,uv run basedpyright0 errors/0 warnings/0 notes,git diff --checkclean. (One earlier full-suite run during the merge hit the documented #143 flake family twice; both pass in isolation and the rerun was clean.)Privacy/security re-verified: reasoning never enters logs/audit/diagnostics (structural notes only); continuation fingerprints remain digest-only (reasoning plaintext never stored); v4 adds no command/path/env surface; all reasoning members remain bounded; malformed v4 content fails closed.
Fresh independent exact-head review of the combined behavior follows. PR left open; not merged.
Fresh independent exact-head review — integrated head (reviewed
e4b4180, final2c66e71)Fresh independent adversarial review (GLM-5.3-Flash agent, isolated context, read-only, exact head) against the 15-point integration checklist: APPROVE — all 15 points PASS, zero BLOCKERs, one SHOULD_FIX (remediated), two DEFER.
SHOULD_FIX (remediated in
2c66e71, comment-only): the reasoning member's serializer comment still said "Version 3" — the last pre-renumber survivor, contradicting the module docstring, the docs' v4 section, and the endpoint's below-4 gate. Now reads "Version 4 (D-063, #158) — v4-only, gated by the negotiated session version."DEFER (with reasons):
reasoning_deltaCHUNK frames are not version-gated on below-4 sessions (the documented v4-only claim is scoped to the message member; the chunk kind deliberately rides the generic chunk serialization per docs; genuine below-4 peers structurally cannot emit the kind, and v4 workers never negotiate below 4 — both member gates are defense-in-depth). Optional future pass: gate the kind symmetric with the member or add a clarifying doc sentence.Checklist highlights (all 15 PASS, evidence on file): D-062/continuation files (
worker_bridged_adapter.py,gateway_continuation.py,gateway_coordinator.py,routing_core.py,control_api.py,worker_codex_adapter.py) have EMPTY diffs vsorigin/develop— merged #159 preserved verbatim; the ledger holds exactly one D-062 (continuation) and one D-063 (reasoning, with renumber provenance); the negotiation gates are wired end-to-end (endpoint rejection typed + workerensure_reasoning_representable→ typed failed result → 502backend_failure, never a silent drop); no exact-shape parser accepts v4 members under v3; no reasoning in audit/fingerprints; the PR diff vs current develop contains only reasoning semantics + required integration (25 files, no duplicated #159 machinery).Gates (reviewer-run on this head): full suite 2388 tests OK; basedpyright 0/0/0;
git diff --checkclean; narrow final verification of2c66e71(comment-only delta): FINAL_VERIFICATION_PASS, no new findings.State:
READY_FOR_OWNER_MERGE. PR left open for the human merge gate; workers never merge.Decision-number follow-up: open PR #161 also records a D-063 (canonical ledger unaffected)
Verified after this PR's integration: canonical
develop(now8d6d59e) still ends its decision ledger at D-062 — D-063 is and remains canonically FREE, and this PR's D-063 (reasoning output) is the only D-063 on the canonical ledger. However, open PR #161 (M07 Stage 2,task/92-zcode-stage2, base59538e9— predating #159's merge) records its own "D-063 (amended)" in its unmerged branch, from a session that numbered before #159's D-062 landed shifted the frontier.Same situation as the earlier D-062 double-claim, same recorded resolution: both heads are reviewed/frozen artifacts; whichever of #160/#161 merges second renumbers to the next free number (D-064 as of now) as a whole-branch textual renumber per the D-057/D-058 precedent. Nothing in this PR changes: the reasoning decision is D-063 on the canonical ledger, the worker-protocol v4 lineage stands, and head
2c66e71remainsREADY_FOR_OWNER_MERGEpending the human merge gate. (This PR's integration target was the post-#159 developf79f452, as instructed;8d6d59e's newer non-continuation changes are not part of this task's merge scope.)Final develop merge complete and green — but the D-063 collision is now real on canonical:
GENUINE_OWNER_DECISION_REQUIREDDone as instructed: canonical
develop@8d6d59e(the task's stated SHA; the then-current tip) merged into this branch — merge commit23df96b(parents2c66e71,8d6d59e), zero conflicts, delta pre-classifiedSEMANTICALLY_DISJOINT(PR #163 agent-discoverability:README.md,scarcity_router/mcp.py,tests/test_mcp.py; zero file overlap with this PR's set;NO_SEMANTIC_ADAPTATION_REQUIRED— no production code touched beyond the merge). Ledger: exactly one D-062 (continuation), one D-063 (reasoning), no duplicates. Protocol: v3 = D-062, v4 = D-063,WORKER_PROTOCOL_VERSION = 4, server(4, 3, 2, 1), both no-silent-loss gates intact.Gates on
23df96b: focused suites 371 OK; fullmake check— first run hit the documented #143 flake (test_scenario_11, passes in isolation), second run green in one pass: 2388 tests OK, basedpyright 0 errors/0 warnings/0 notes,git diff --checkclean. PR diff vs8d6d59e: 25 files, reasoning semantics + integration only — no duplicated #159/#163 content. Independent narrow exact-head verification (fresh read-only agent, 9-point): INTEGRATION_VERIFICATION_PASS, no findings; #163 content preserved byte-identical, reasoning/continuation files byte-identical to the reviewed state.Why this is not
READY_FOR_OWNER_MERGEyet: after the merge was created, canonicaldevelopadvanced again to32fe215— PR #161 (M07 ZCode Stage 2) is now MERGED, carrying its own### D-063 — M07 Stage 2 implementation(verified atdocs/decisions.md:4901onorigin/develop). This PR carries### D-063 — Provider reasoning outputfor the same number. The two claims are no longer "an unmerged branch's claim" — they now sit one merge apart on the two lines of history, and merging this PR as-is would put two different D-063 sections on the canonical ledger. That is exactly the condition this task's stop rule names (canonical develop unexpectedly gained a D-063 after the last verified state→ stop, do not silently renumber), so the decision is yours:git merge --no-ff origin/developagain to absorb32fe215, full gate + re-verification) — the clean ledger-first path; I can execute it immediately on your word; ordeveloprenaming the reasoning record to D-064) — faster, but the canonical ledger carries the duplicate between merge and fixup; orThe branch itself is green, verified, and ready; the only open question is the renumber sequencing above. Per governance I have not merged, have not touched PR #161, and have not renumbered anything silently.
D-064 reconciliation: current
develop(merged #161) integrated — decision numbering unique, protocol v4 unchangedMerge: canonical
develop@32fe215(merged #161, M07 ZCode Stage 2) merged into this branch per the owner-directed topology — merge commit43ec2cc(parents23df96b,32fe215). One conflict (docs/decisions.md, both sides had appended near the same slot), resolved semantically; the five overlapping production/test files (worker_client.py,worker_endpoint.py,docs/providers.md,tests/test_openai_http_adapter.py) auto-merged with both feature sets intact.Decision reconciliation (owner-authorized 2026-09-30): the canonical ledger now reads exactly — D-062 Codex client-tool continuation (#159, untouched) · D-063 M07 ZCode Stage 2 (#161, preserved verbatim from develop) · D-064 provider reasoning-output preservation (this PR's record, renumbered D-063 → D-064 with provenance). Only reasoning-specific references moved; every #161 D-063 reference (ZCode plan lane, registration facts, execution-surface rows) stays D-063. No duplicate decision IDs.
Protocol numbering unchanged (D-number ≠ protocol version):
WORKER_PROTOCOL_VERSION = 4, server(4, 3, 2, 1); v3 = D-062 tool continuation, v4 = the reasoning-capable protocol (messagereasoningmember +reasoning_deltachunks) on top of complete v3. No v5 invented.#161 interaction (verified from source, no adaptation needed):
ZCodeLocalAdapterconstructs its result asAdapterMessage(role="assistant", content=response)— it never sets a reasoning member (the plan lane evidences none; the adapter even rejectsreasoning_effortrequests typed withreasoning_effort_not_enforceable). Nothing fabricated, nothing added.run_allowlisted→_execute_task→_result_messagepath that callsensure_reasoning_representable(worker_client.py:1005) — a below-v4 negotiation can never silently carry or drop reasoning on any local-adapter kind. #161's worker_client delta is registry/CLI construction only; its endpoint delta is the auth-state liveness filter — the below-4 exactness gate (_complete_attempt) and negotiation are untouched.Gates on the exact head
43ec2cc: focused suites — reasoning/protocol/endpoint/client/continuation/bridged/MCP + the NEW #161 suites (test_worker_zcode_adapter,test_execution_sources): 488 OK; e2e (ZCode acceptance, execution, Codex acceptance): 44 OK; fullmake checkgreen in ONE run — 2492 tests OK,uv run basedpyright0 errors/0 warnings/0 notes,git diff --checkclean. Freshness check immediately before push:origin/developstill32fe215, fully contained in the head.PR diff vs current develop: 25 files — reasoning-output semantics, D-064 decision/docs, worker protocol v4 reasoning extension, reasoning tests, and the minimum integration glue; no duplicated #159/#161/#163 implementation. Independent exact-head verification follows (narrow — the only semantic change was the textual renumber). Not merged; the owner gate stays intact.
Independent exact-head verification of the reconciled head — final
Fresh independent read-only verification of the integration + reconciliation, 12-point checklist:
43ec2cc): 11/12 PASS, one SHOULD_FIX — two missed reasoning renumbers in test docstrings (test_worker_endpoint.py,test_worker_bridged_adapter.pystill said D-063; the only reasoning references the sweep missed). Docstring-only, zero behavioral impact.b4affcf(2 insertions / 2 deletions, comment-only).b4affcf):FINAL_VERIFICATION_PASS— no new findings; every remaining D-063 reference repo-wide is #161 ZCode-side or the historical renumber narration inside the D-064 provenance note.Checklist (all 12 PASS on the final head): D-062 = Codex continuation (record + continuation files byte-identical to develop) · D-063 = ZCode Stage 2 (record byte-identical to develop; #161 references untouched) · D-064 = reasoning (provenance covers both renumbers) · no duplicate IDs · protocol v3 semantics unchanged · v4 reasoning semantics unchanged (merge's production delta = comment renumbers + develop's own #161 code, zero behavioral lines of ours) · no v5 (
WORKER_PROTOCOL_VERSION = 4, server(4, 3, 2, 1)) · #161 worker changes cannot bypass the representability gate (ZCode result path traced throughensure_reasoning_representable; ZCode constructs no reasoning member) · ZCode semantics not falsely expanded (typedreasoning_effort_not_enforceable) · no-silent-loss invariant tested at both ends · PR diff = 25 files, reasoning set only · gates green.Gates on the final head's code content (
43ec2cc, + 2 comment lines atb4affcf): fullmake checkgreen in ONE run — 2492 tests OK,uv run basedpyright0 errors/0 warnings/0 notes,git diff --checkclean; targeted rounds 232/107 tests OK; freshness confirmed (origin/develop=32fe215, fully contained).State:
READY_FOR_OWNER_MERGE. PR left open for the human merge gate; workers never merge.