fix(libsy): anchor every pre-reply user message for the escalation judge and log verdicts - #639
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WalkthroughThe Responses codecs now preserve encrypted reasoning, decode reasoning from multiple event shapes, suppress duplicate streamed text, and encode plaintext through standard ChangesResponses reasoning translation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to Streaming Responses can produce malformed reasoning event sequences or lose encrypted reasoning when multiple reasoning items are present. These compatibility and preservation regressions should be fixed before merge. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 53.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 28 functions across 6 files. (1 skipped: 1 unsupported.) Full details: Title checkExplanation The title is unrelated to the pull request changes. It describes anchoring user messages and logging escalation-judge verdicts, but the changes preserve and standardize Responses API reasoning content.
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Inline comments:
In `@crates/switchyard-translation/src/codecs/responses/stream.rs`:
- Around line 728-734: Update ensure_responses_reasoning_started and its callers
so response.reasoning_summary_part.added is emitted only when the first
non-empty reasoning text delta starts, not for encrypted-only
ReasoningDetailsDelta values. Preserve encrypted-data handling while ensuring
encrypted-only streams emit neither an opened summary part nor a corresponding
summary entry.
- Around line 321-323: Update the reasoning accumulation around
encrypted_reasoning_data and StreamTranslationState to key text and encrypted
payloads by each ReasoningDetailsDelta output index instead of merging or
overwriting them. During finalization, emit one Responses reasoning item per
index with its corresponding content and encrypted_content, and add coverage for
two encrypted reasoning items.
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crates/switchyard-translation/Cargo.tomlcrates/switchyard-translation/src/codecs/common.rscrates/switchyard-translation/src/codecs/responses/buffered.rscrates/switchyard-translation/src/codecs/responses/stream.rscrates/switchyard-translation/src/codecs/stream.rscrates/switchyard-translation/tests/response_translation.rscrates/switchyard-translation/tests/stream_translation.rs
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Verification update, same five DeepSWE-v1.1 tasks, Codex 0.149.1, Kimi-K3 efficient tier, escalation route, image built from this branch:
On the previous main-based image the same tasks recorded 0 reasoning items every time. Two of the four completed runs latched to the strong tier immediately (0 efficient-tier calls), so the judge path is exercised as well. I will add the fifth result when it lands. |
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Final verification, all five tasks complete (same setup as above: Codex 0.149.1, Kimi-K3 efficient tier, escalation route, image built from this branch):
On the previous main-based image every one of these tasks recorded 0 reasoning items. No infrastructure failures; task 2's earlier non-zero agent exit was the verifier failing to compile that task's patch (task-level), and its final execution completed normally. The first three completed members of a full 113-task run on this image show the same picture: patches applied on all three, 19 / 24 / 23 reasoning items recorded by the client. |
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Added one more commit found while investigating remaining behavioural differences between the escalation route and passthrough with the fix applied. The stream encoder derived synthesized output-item ids from the output index alone ( Ids now include the response id ( |
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Live check of the image built from 370793d (unique synthesized ids) on the same five DeepSWE tasks through the escalation route: all five completed, four solved, zero upstream 400s and zero judge fail-opens. Reasoning items recorded by the Codex client per task were 94, 65, 51, 35 and 41, up from 65, 48, 15, 28 and 26 on the previous commit and 0 on main, so the id change also lets the client keep more of the replayed reasoning. |
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Found a regression in the unique-id commit while running the escalation route live: the NVIDIA hub returns Kimi-K3 response ids of roughly 360 characters, so the synthesized item ids built from them ran to 377 characters. Kimi accepted the replayed history, but once a session latched to GPT-5.6 Sol every request failed with a 400 ("Invalid 'input[3].id': string too long, maximum length 64") and the session died. Fixed in 746202f: response ids longer than 40 characters are replaced by a 64-bit FNV-1a digest in the item id, which keeps ids distinct per response and bounded at well under 64 characters. A regression test drives two 370-character response ids through the encoder and checks the item ids stay under the limit and differ. |
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Another live finding, this time with GPT-5.6 Luna as the efficient tier: the buffered path kept Luna's encrypted reasoning but re-emitted the item under a synthesized id, and OpenAI rejected the client's next request with invalid_encrypted_content ("item_id did not match the target item id"), killing the session on turn two. Kimi-K3 never showed this because it returns no encrypted reasoning. Fixed in cc5a4c9: the reasoning.encrypted detail now records the provider's item id and both encoders reuse it, with a warning-and-drop fallback if the id only arrives after the item has opened under another id. Tests cover the buffered round trip and the re-streamed aggregate keeping the provider id. |
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One more from the same family, reported by Sabhatina in #nemo-switchyard-dev on the stage router (ev_26e4f1d1d31647e4a77c5db9b0): after the router added a handoff note the request could no longer be replayed verbatim, the history was re-encoded, and GPT-5.6 Sol answered 400 "Invalid 'input[2].content': array too long. Expected an array with maximum length 0". The request encoder was replaying reasoning items with the text in a content array and an empty summary, and dropped encrypted payloads; OpenAI requires content to be empty on input reasoning items. Fixed in 8a3cf0d: replayed reasoning uses the summary_text shape with no content and keeps the encrypted payload and provider item id, the same shape the response encoders now emit. Two tests cover the plain and encrypted cases. |
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Split, as agreed: the OpenAI Responses codec fixes that were here now live in #646 (they apply to any router that transforms traffic). This PR keeps the escalation-judge changes only: task-framing anchoring and verdict logging. Earlier comments in this thread about item ids and encrypted reasoning refer to commits that are now on #646. |
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linj-glitch
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The escalation judge already returns a reason with every verdict, but the router discarded it after reading the boolean, so an operator tuning the judge prompt could not see why sessions were held on the efficient tier. Keep the reason on the verdict and emit one debug event per verdict under the util::escalation target; it is silent unless that target is enabled. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> (cherry picked from commit 5e6cf24ed4a86b223c2aba4940f43c655049a58e) Signed-off-by: Lin Jia <linj@nvidia.com>
…n judge The trajectory summary handed to the escalation judge pinned only the first user message as the task statement. Codex sends an environment context block as its first user message and the task as the second, so the judge saw shell and cwd boilerplate as the task while the real task sat in the rolling window, truncated to the per-message cap, and scrolled out after about thirty messages. From then on every task-aware pattern in the rubric (drift, unverified completion, violated constraints) had nothing to compare against, and only friction patterns could fire. Treat every user message that precedes the first assistant reply as task framing and anchor them all, with a wider per-message budget so a multi-thousand-character feature specification survives intact. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> (cherry picked from commit fc61f715ed165e73e0664e4a866ec3b99aa38742) Signed-off-by: Lin Jia <linj@nvidia.com>
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Summary
This PR now holds only the escalation-router-specific changes found while benchmarking the escalation mode of
llm_classifierbehind Codex 0.149.1 on DeepSWE-v1.1. The OpenAI Responses codec fixes that used to live here apply to any router that transforms traffic and have moved to #646; the two PRs are independent and can merge in either order.Problem
The trajectory summary handed to the escalation judge pinned the first user message as the task statement. Codex sends an environment context block (cwd, shell, date) as its first user message and the task as the second, so the judge read shell boilerplate as the task while the real specification sat in the rolling 28-message window, truncated to the per-message cap, and scrolled out after about thirty messages. On a real 485-message DeepSWE session the task was visible to the judge for the first thirty messages only. From then on every task-aware pattern in the rubric (drift, unverified completion, violated constraints) had nothing to compare against, and only friction patterns such as loops and environment fighting could fire. Measured over 64 tasks with the task made visible, the packaged rubric voted to escalate on 1.2 percent of turns, always as isolated votes, so the two-consecutive-votes gate produced zero latches.
Separately, the judge's verdict reason was parsed and discarded, so there was no way to see why sessions were held on the efficient tier without instrumenting a build by hand.
Change
Every user message that precedes the first assistant reply is treated as task framing and anchored, with a wider per-message budget so a multi-thousand-character feature specification survives intact. This is harness-agnostic: for a client whose first user message is the task nothing changes, and for Codex the task is pinned alongside the environment block. A new test covers the Codex shape and checks that user messages after the first reply stay ordinary window entries.
The verdict now keeps its reason and emits one debug event per verdict under the
switchyard_libsy::algorithms::util::escalationtarget. It is silent unless that target is enabled, and it made it possible to read, per session, which rubric pattern fired.Validation
libsy tests pass (283) and clippy is clean with
-D warnings. Live, on a 64-task DeepSWE subset with verdict logging enabled, judge reasons after the change cite the specification ("early exploration of a large, cross-module feature", "verifying all required behaviors") where before they could only describe shell activity. The change does not by itself alter DeepSWE scores under the packaged rubric, because that rubric targets in-trajectory failure that DeepSWE tasks rarely show; the benchmark write-up covers that separately.