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Re-run at @wenshao's request, following his end-to-end verification. Gate re-checked at the current head.

Template looks good ✓

Problem: observed bug, now with wire-level evidence. #8258 surfaced in code review on #8169 with the root cause confirmed in source, and the maintainer's local harness (real CLI against a mock Anthropic endpoint) showed main does worse than drop the second signature — it emits one block carrying episode one's signature over both episodes' concatenated text, i.e. a mis-signed block. Observed, not theoretical.

Direction: aligned. Per-episode signature preservation is required for Anthropic interleaved thinking and OpenAI Responses replay validity. Claude Code's CHANGELOG ships a fix in the same problem area ("Fixed sessions getting stuck after ... stale thinking-block signatures in history").

Size: 589 production lines (geminiChat.ts +348/−84, converter.ts +130/−21, anthropicContentGenerator.ts +6/−0) and 2,519 test lines (+2,356/−163). Production grew from 225 lines at first triage past the 500 mark via review-round fixes (dangling-episode guards, predicate unification), so per the two-tier rule this is flagged for maintainer awareness — noted here, with the consequence stated in Stage 3. Not blocking on size alone.

Approach: still the minimal cohesive set. The primary consolidation change and its companions (XML-recovery predicate, converter hoist removal, dangling-episode guards) each close a defect that would otherwise undo the primary fix; splitting them would ship broken intermediate states. No drive-by changes.

Risk: ⚠️ geminiChat.ts matches this repo's high-risk path set (correlated with post-merge reverts), so full Stage 2 enrichment and CI evidence apply. The sandboxed /verify run is already in flight for this head (see Stage 2).

Moving on to code review. 🔍

— Qwen Code · qwen3.8-max

_{Reviewed at 6b3e68adc53b4b7a4b367e12cef76dae7cbe3a87 · re-run with @qwen-code /triage}

Code review (at 6b3e68adc5, seventh-round head)

Independent proposal vs. the diff: I'd have done the same thing — replace merge-all/keep-first-signature with a single-pass episode tracker that flushes on a non-thought part or on fresh text after a signed episode, concatenate signature fragments, drop the converter's thinking hoist, and repair manual-mode's leading-thinking requirement uniformly across history so serialization stays position-independent. The PR matches this; I found no simpler path it missed. What it adds beyond my proposal — the dangling-episode guards and the predicate unification — each answers a concrete defect surfaced in the review rounds, not speculation.

What this pass verified, beyond the prior rounds:

• The consolidation loop's boundary logic is correct, and the two documented known limitations are real and honestly bounded: back-to-back unsigned episodes merge (no signature to test), and two text-less signed episodes concatenate into one signature valid for neither — unreachable on the Anthropic wire, reachable only via the feat(core): add OpenAI Responses API content generator #8169 Responses shape with summaries disabled, and flagged there.
• dropDanglingUnsignedTrailingThought's trailing-only scope is the right call: truncation can only strand the last episode, and non-signing providers (DeepSeek) legitimately carry unsigned thoughts mid-array. All four call sites are placement-justified; the XML-recovery one correctly captures trailing-ness before its removal loop (which would otherwise manufacture a trailing position), and the Math.min(insertAt, length) clamp covers the shrink.
• isVisibleTextPart now makes contentText and the XML-removal loop the exact same set. I verified against main that isValidNonThoughtTextPart excludes thoughtSignature-bearing parts, so the deliberately looser predicate is the right middle: the stricter one would leak raw XML into durable history, the bare .text !== undefined one would delete reasoning episodes.
• Converter: straight concatenation in mergeConsecutiveAssistantMessages is sound because interleaved-thinking-2025-05-14 is unconditionally enabled whenever thinking is set, and ensureLeadingThinkingOnToolUseAssistantMessages moves only the first contiguous thinking run, only on tool_use-bearing messages, only in manual mode — keeping the cached prefix stable across turns (wenshao confirmed byte-identical manual-mode output vs main, and prompt-cache prefix stability, on the wire).
• Recording: redactStructuredOutputArgsForRecording returns null only for parts without a functionCall (checked against main), so the non-null assertion is valid; inlineData/fileData now reaching the session JSONL is declared in the PR body.

Findings: no critical blockers at this head. One accuracy nit for the record: the PR body says no existing assertion was modified, but one test's assertions were inverted — the converter merge-order test now expects [thinking, text, thinking, tool_use] instead of [thinking, thinking, text, tool_use]. That's the intentional behavior change itself, pinned by the rewritten test, and belongs with the maintainer's existing stale-count/doc nits. Non-blocking.

The consolidation → wire flow this PR reshapes:

sequenceDiagram
    participant P1 as Stream chunks
    participant P2 as Consolidation loop
    participant P3 as Dangling-episode guard
    participant P4 as History and JSONL
    participant P5 as Converter pipeline
    participant P6 as Anthropic wire
    P1->>P2: thought, text and toolCall parts in stream order
    P2->>P2: flush episode on non-thought, or on new text after a signature
    P2->>P3: each episode as its own Part, original position
    P3->>P4: drop unsigned trailing episode when a tool call is present
    P4->>P5: next request rebuilds messages from history
    P5->>P6: manual mode moves the first thinking run to the front

Testing

Unattended CI run — no PR code executed locally. Evidence is the PR's own CI at the reviewed commit, quoted below, plus the maintainer's harness write-up (attributed) and the in-flight sandboxed run.

All checks on 6b3e68adc5 are complete; none failed. Test (macos/windows) and Integration Tests (CLI) are skipped by design on every PR — those jobs run only in the merge queue, not conditional on ubuntu (correcting this comment's earlier characterization).

Behavioural evidence. The wire-level claim (episodes survive consolidation and replay byte-exact) is not settled by unit CI alone. Two things speak to it here: (1) wenshao's maintainer verification — real CLI against a mock Anthropic endpoint, A/B vs the merge-base, three mutation probes showing the new code is load-bearing, manual-mode output byte-identical to main — posted above and attributed to him, not re-run by this bot; and (2) a sponsored sandboxed /verify run is already in flight for this head (run 32659662886); its A/B report will post to the lifecycle comment. Read that report with the same skepticism as the fork's own CI logs — the code under verification is adversarial input even though the sandbox bounds what it can do.

Not verified by this run: real Anthropic API (mock only, by both harnesses), the OpenAI Responses wire (#8169), and the DeepSeek truncated-reasoning false positive (code-reading only).

— Qwen Code · qwen3.8-max

_{Reviewed at 6b3e68adc53b4b7a4b367e12cef76dae7cbe3a87 · re-run with @qwen-code /triage}

Confidence: 3/5 — clean review at this head, but the two-tier rule's 500+ production-line flag for fork core PRs caps the bot at defer; this is the policy speaking, not doubt about the code.

Stepping back: this is the strongest shape a fork PR can arrive in. The problem was observed in the wild (#8258), the root cause is confirmed in source, and the failure is actually worse than reported — a mis-signed block, not merely a lost signature. The algorithm is the natural one; I arrived at it independently before reading the diff. Seven review rounds converged — round seven raised only Suggestions, and wenshao's read of the thread is that no standing Critical remains at this head. The maintainer then verified it end-to-end on the wire with mutation probes and found the new code load-bearing and manual mode byte-identical to main. CI is green at 6b3e68adc5. If I were maintaining this in six months I'd thank the author — the comments explain the why of every guard, including the trade-offs each one accepts.

Why not approve, then: the PR now carries 589 production lines in packages/core/src/core/ (it was 225 at first triage; the growth is review-round fixes, which makes it legitimate, but the size fact stands). Under the two-tier core rule, a fork PR at that size gets maintainer awareness instead of the bot's automatic approval — and wenshao's awareness here, while unambiguously given, is exactly what the rule asks a human to own. He has already cast one of the two required approvals; the gate's question is whether the second one should be the bot's on a change this large in this file (geminiChat.ts is this repo's highest-revert-risk path). That is a human call, so I'm making it one explicitly rather than approving.

@wenshao — escalating per the size rule. Your options as I see them: a second human approval (yours already stands at 6b3e68adc5), or an explicit instruction in this thread to approve despite the size policy (a re-triggered /triage will read it as resolving the escalation), or merge via admin. Two housekeeping facts for whichever path you pick: the round-6 CHANGES_REQUESTED review from this bot account (commit 2fe2ee32, superseded by round 7) still pins reviewDecision and is dismissable by a maintainer; and the branch is 311 commits behind main — you validated the merged tree locally (no conflicts, suite green), so an up-to-date push should be clean, and any approval here is pinned to 6b3e68adc5 and dismisses on the push. The sandboxed /verify report will land in the lifecycle comment shortly.

@netbrah — nothing further needed from you on the code; this hold is policy, not findings.

— Qwen Code · qwen3.8-max

_{Reviewed at 6b3e68adc53b4b7a4b367e12cef76dae7cbe3a87 · re-run with @qwen-code /triage}

Live wire verification: same-response multi-episode replay confirmed

I ran the built dogfood/reasoning-fidelity branch through a byte-recording reverse proxy against a real OpenAI Responses model (gpt-5.6-sol, high reasoning effort). This produced the exact runtime shape that the consolidation fix targets, not merely multi-turn signature growth.

Qualifying response

One SSE response completed two distinct encrypted reasoning items before its function call. Sanitized response.output_item.done events:

{"output_index":0,"type":"reasoning","id":"rs_040c2d905c1da525016a6d12a1e9108197bbaf5185bd010f22","encrypted_bytes":1464,"encrypted_content_sha256":"cc02d44cb4fdbd13d9f52df07f02ec293561fa63ac42a1a9fd7a234e54c31e7a"}
{"output_index":1,"type":"reasoning","id":"rs_040c2d905c1da525016a6d12a3b08c8197afebe810eb1c207f","encrypted_bytes":1100,"encrypted_content_sha256":"eb592d9b5256e58fb86bd034029823cfa8be61cc7ea54f8efec60f5f038f4bd8"}
{"output_index":2,"type":"function_call","id":"fc_040c2d905c1da525016a6d12a4cd3481978ff7576b94ac7264","call_id":"call_RCmWggzme2vihVKSZ7Ql4UZq","name":"run_shell_command"}

So the model emitted this in one response:

reasoning A + encrypted payload A
reasoning B + encrypted payload B
function_call

This is the PR's back-to-back episode case: a second reasoning episode begins after the first episode is signed, without a tool-call boundary between them.

Immediately following request

After Qwen Code converted and consolidated that response, the next request contained these ordered replay items:

{"input_index":1,"type":"reasoning","id":"rs_040c2d905c1da525016a6d12a1e9108197bbaf5185bd010f22","encrypted_bytes":1464,"encrypted_content_sha256":"cc02d44cb4fdbd13d9f52df07f02ec293561fa63ac42a1a9fd7a234e54c31e7a"}
{"input_index":2,"type":"reasoning","id":"rs_040c2d905c1da525016a6d12a3b08c8197afebe810eb1c207f","encrypted_bytes":1100,"encrypted_content_sha256":"eb592d9b5256e58fb86bd034029823cfa8be61cc7ea54f8efec60f5f038f4bd8"}
{"input_index":3,"type":"function_call","call_id":"call_RCmWggzme2vihVKSZ7Ql4UZq","name":"run_shell_command"}
{"input_index":4,"type":"function_call_output","call_id":"call_RCmWggzme2vihVKSZ7Ql4UZq"}

The verification compared the complete opaque payloads, not truncated display strings:

response reasoning IDs   == next-request reasoning IDs       PASS
response payload lengths == next-request payload lengths     PASS
response SHA-256 list     == next-request SHA-256 list        PASS
response item order       == next-request replay order        PASS

This is direct live-wire evidence that both same-response reasoning episodes survived geminiChat.ts history consolidation as separate entries, retained their order relative to the function call, and replayed byte-for-byte. Under the previous merge-all/keep-first behavior, episode B's replay payload would have been lost.

A separate four-user-turn Anthropic capture verified ordinary history accumulation (0,1,1,2,2,3,3,4) with every signature list an ordered byte-exact prefix of the final list, but that is only a replay-plumbing baseline. The Responses capture above is the load-bearing proof for this PR because both encrypted episodes originated in one model response.

I also probed claude-sonnet-5 with adaptive thinking, high effort, and interleaved thinking confirmed on the wire. Sonnet produced separate HTTP responses (thinking -> tool_use per tool round), not multiple thinking blocks inside one response. That is consistent with Anthropic's documented tool loop: interleaved thinking occurs after tool results arrive on subsequent API calls. The OpenAI Responses capture independently reached the exact shared consolidation path fixed here.

The later test-session stop (Model stream ended after a tool result without visible progress) occurred after the qualifying response/request transition and does not affect the byte-exact consolidation proof above.

推理片段 A + 加密载荷 A
推理片段 B + 加密载荷 B
function_call

input[1] = reasoning A
input[2] = reasoning B
input[3] = function_call
input[4] = function_call_output

响应中的 reasoning ID   == 下一请求中的 reasoning ID       通过
响应中的载荷长度          == 下一请求中的载荷长度              通过
响应中的 SHA-256 列表     == 下一请求中的 SHA-256 列表         通过
响应中的 item 顺序        == 下一请求中的重放顺序               通过

Code Review — fix(core): preserve every reasoning episode's signature during history consolidation

Reviewed at b7fe21c (base 912f7399). I ran the three touched suites locally — 486/486 pass (geminiChat.test.ts 278, anthropicContentGenerator.test.ts 116, converter.test.ts 92).

Overview

The core change is right and well-argued. Replacing the merge-all/keep-first-signature pass with a single-pass episode tracker is the correct shape: each reasoning episode keeps its own Part, its own signature, and its original position relative to the tool calls it preceded. The mergeConsecutiveAssistantMessages de-hoisting and the isValidNonThoughtTextPart fix in the XML-recovery path are genuinely coupled to it — splitting them would leave intermediate broken states. Comment density and the "known limitation" callout are exemplary; the tests pin the interesting boundaries (interleaved episodes, back-to-back episodes, fragmented signature, signature-only mid-turn episode, OpenAI-Responses-shaped payloads).

Two things need attention before merge, one of them a verified regression.

1. 🔴 Regression: XML recovery now leaves raw <invoke> XML in history for { text, thoughtSignature } parts

geminiChat.ts uses two different predicates for what is supposed to be the same set of parts:

• contentText (and therefore recovery.remainingText) — part.text && !part.thought
• the removal loop — isValidNonThoughtTextPart(part), which additionally rejects part.thoughtSignature, inlineData, fileData, functionCall, functionResponse

They are no longer complements. A non-thought text part carrying a thoughtSignature — Gemini's placement for the signature that concludes a reasoning span, and a shape this repo explicitly expects (loggingContentGenerator.ts:976-986 preserves exactly { text, thoughtSignature } with no thought flag) — is counted into contentText but not removed. The result: the original part survives with the raw XML in it, and remainingText is spliced in on top → duplicated prose and <invoke …> leaking into durable history.

Verified with a probe (single chunk, parts [{ text: 'Sure.\n<invoke …>', thoughtSignature: 'gemini-sig' }], then assert no history part contains <invoke):

The existing test retains a short text prefix in history when recovering XML tool calls asserts exactly this invariant; it just doesn't cover the signature-bearing variant.

Suggested fix — one predicate, used in both places:

const isConsumableRecoveryText = (part: Part) =>
  !part.thought && typeof part.text === 'string' && part.text !== '';

…and use it for contentText, for the recomputed contentText, and for textIndices. (Or keep isValidNonThoughtTextPart for both — either way they must agree.) Worth a regression test with thoughtSignature on the plain-text part.

2. 🟡 Undeclared behavior change: session JSONL now embeds inlineData/fileData blobs

The recording rewrite changed more than the reasoning parts. Old code built the record explicitly ([thought?, {text: contentText}?, ...functionCallParts]) — redactStructuredOutputArgsForRecording returned null for every non-functionCall part, so media parts were never recorded. New code records every element of consolidatedHistoryParts.

Verified probe (model turn = [{text:'here is the image'}, {inlineData:{mimeType:'image/png', data:'BASE64BLOB'}}]):

base      PROBE RECORDED [{"text":"here is the image"}]
this PR   PROBE RECORDED [{"text":"here is the image"},{"inlineData":{"mimeType":"image/png","data":"BASE64BLOB"}}]

For image-capable models this writes full base64 payloads into the session JSONL on every turn — unbounded file growth, and model-produced media now sits on disk indefinitely, which reads against the privacy rationale documented right above redactStructuredOutputArgsForRecording. The PR states "Breaking changes / migration notes: none", so this looks unintended rather than a deliberate fidelity improvement. Either filter the recording to text/thought/functionCall parts, or make it an explicit, documented decision.

While you're there: .filter((part): part is NonNullable<typeof part> => part !== null) after part.functionCall ? redact(part) : part is dead — redactStructuredOutputArgsForRecording only returns null when !part.functionCall, which the ternary already excludes.

3. 🟡 Commit 2 (ensureLeadingAssistantThinking) isn't in the PR description

The description only covers the de-hoisting; the second commit partially re-introduces it for manual mode. That's a reasonable escape hatch, but three things:

• Update the PR body — a reviewer reading only the description will not know this pass exists.
• What's the evidence? The added test asserts our own converter output against a mocked SDK, so it can't demonstrate that Anthropic actually rejects the straight-concatenated shape. Did you see a live 400 (Expected 'thinking' or 'redacted_thinking', but found 'text') on a manual-budget model? If yes, quoting it in the body would settle it; if it's precautionary, say so.
• Scope: the doc says "whenever a tool_use remains in it", but the implementation reorders the latest assistant message unconditionally. When that message has no tool_use (e.g. a fresh user turn following a completed assistant turn), the reorder is unnecessary and re-breaks the chronology this PR set out to protect. Gating on blocks.some(b => b.type === 'tool_use') would make it match its own doc.

4. 🟢 Follow-ups / observations (non-blocking)

• Per-episode .trim() vs. signature validity. flushThoughtEpisode trims each episode's accumulated text. Anthropic's signature is computed over the exact thinking text, so trimming is a replay-validity hazard. It's pre-existing for the single-episode case, but the multi-episode split now applies it at every internal episode boundary too (e.g. "A\n\n" + " B" used to join to "A\n\n B", now becomes "A" and "B"). Consider keeping the raw text on the Part and using the trimmed value only for the "is this episode empty" test.
• redactStructuredOutputArgsForRecording still drops thoughtSignature from functionCall parts (return { functionCall: part.functionCall }). Since Gemini attaches the signature to the functionCall part, --resume still loses signatures on that wire — the same class of bug this PR fixes for thought parts. Worth a follow-up issue.
• The boundary heuristic reconstructs information the wire already had. anthropicContentGenerator.ts sees content_block_start / content_block_stop with an explicit index for every thinking block, and currently emits nothing for them. Threading a real boundary signal through (block index on the chunk, or a synthetic episode-close part) would eliminate both the documented no-signature limitation and the [sig, text, sig] case, where openEpisodeText.length > 0 suppresses the flush and two distinct signatures get concatenated into one unusable blob. Given the effort already spent on the heuristic, an explicit boundary looks like the cheaper long-term shape.
• Aliasing nit. this.history.push({ role: 'model', parts: consolidatedHistoryParts }) now shares the live array (previously a fresh spread). Nothing mutates it after this point today; a [...consolidatedHistoryParts] is cheap insurance against a future edit below the push.

Verdict

Direction and core algorithm: approve. Item 1 is a blocking regression — a verified behavior change from base that puts raw tool-call XML back into durable history. Item 2 needs an explicit decision (fix or document). Item 3 is a description/scoping gap. Items in §4 are follow-ups.

@qwen-code /resolve

Qwen Code resolved the merge conflicts and pushed the branch update.

Merge resolution: PR #8260 ← main

Root cause

Both this PR and main inserted a brand-new helper at the same anchor point in packages/core/src/core/anthropicContentGenerator/converter.ts — the blank line between mergeConsecutiveAssistantMessages and the cleanOrphanedToolCalls doc comment.

• PR fix(core): preserve every reasoning episode's signature during history consolidation #8260 added ensureLeadingThinkingOnLatestAssistantMessage.
• main commit 40efe41ce (fix(anthropic): dedup duplicate tool_result blocks sharing a tool_use_id #8163, dedup duplicate tool_result blocks sharing a tool_use_id) added makeToolResultDeduper.

Git aligned on the shared /** … } skeleton there and reported one conflict (~lines 1439–1516).

Textual, not semantic

The sides share no logic. Each added an independent, self-contained function with its own doc comment. Resolution: keep both verbatim, PR's first then main's, each with its own closing brace. Everything else auto-merged — main's dropEmptyTextThinkingBlocks step and its two makeToolResultDeduper() call sites (in cleanOrphanedToolCalls and mergeConsecutiveUserMessages) landed cleanly beside the PR's ensureLeadingThinkingOnLatestAssistantMessage(messages) call.

What is load-bearing

• Both helpers must stay defined — each has live callers. ensureLeadingThinking… is called once (guarded by options.ensureLeadingAssistantThinking, last in the pipeline after mergeConsecutiveUserMessages/stripTrailingAssistantPrefill); makeToolResultDeduper is called twice. Dropping either to "resolve" the conflict leaves a dangling reference.
• Pipeline ordering is untouched by this merge. The PR's leading-thinking fix runs last, after main's new dropEmptyTextThinkingBlocks; main's comment requires dropUnsignedThinkingFromAssistantMessages to run before dropEmptyTextThinkingBlocks. A future edit reordering these three steps breaks that documented invariant.

What I could not verify

No build/typecheck/tests run here (out of scope). The merge is textually additive, so I expect no behaviour change beyond the union of both branches' effects. Watch in CI: both sides edit converter.test.ts (auto-merged, no conflict), but the combined pipeline now holds both dropEmptyTextThinkingBlocks and ensureLeadingThinking… — any assertion on pipeline count/order runs against that new reality.

Addressed the Critical from the latest review round ("XML-recovery predicate divergence leaks raw tool-call XML into durable history"), fixed in da4b3e381.

Confirmed the finding by reproduction before fixing: contentText's filter (part.text && !part.thought) and the XML-recovery removal loop's filter (isValidNonThoughtTextPart, which additionally excludes any part carrying thoughtSignature) disagreed on what counts as "visible text." A part with thoughtSignature set but no thought: true — a real wire shape (loggingContentGenerator.ts's stream aggregation spreads thought and thoughtSignature independently) — was picked up by contentText for XML detection but survived the removal loop untouched, leaking the raw <invoke> XML into history duplicated alongside the recovered functionCall.

Fix: a single isVisibleTextPart predicate now backs contentText's initial computation, its post-recovery recompute, and the removal loop's textIndices scan — the same fix requested by an earlier Suggestion on this PR flagging the three-way predicate duplication. Deliberately kept the looser predicate (not isValidNonThoughtTextPart) as the shared one: narrowing contentText itself would make hasAnyContent treat genuine visible text as absent on ordinary turns. flushThoughtEpisode always sets thought: true on episode parts, so !part.thought alone (already contentText's semantics) was always sufficient to protect reasoning episodes from the removal loop — the extra signature exclusion in isValidNonThoughtTextPart was unneeded there and is what caused the divergence.

Added a regression test with a plain-text part carrying a stray thoughtSignature and XML content — confirmed it fails on unfixed code (raw XML survives in history) and passes after the fix.

Also landed the two outstanding test-coverage Suggestions from the same review round (multi-thinking-run case for ensureLeadingAssistantThinking, and a generator-level adaptive-mode test), plus a JSONL-recording regression test for interleaved reasoning episodes. All addressed inline threads are marked resolved.

Full suite: 500 passing / 1 pre-existing unrelated failure (a User-Agent header assertion that fails identically on origin/main due to an environment variable in this sandbox, confirmed unrelated to this change). Typecheck and lint clean.

One item for visibility: this branch was recently updated with a merge of main, but main has since advanced enough that GitHub now reports mergeStateStatus: CONFLICTING (conflict in geminiChat.ts against the latest main). Flagging rather than resolving unprompted, since geminiChat.ts is high-traffic and I'd rather have alignment before rebasing again.

Maintainer verification — built a real local harness and ran this end-to-end

@netbrah @qqqys — I verified this against a real qwen CLI process talking to a mock Anthropic Messages endpoint (SSE), rather than at unit level, so the thing being asserted is the actual bytes the CLI puts back on the wire on the next turn. Verified at head 6b3e68adc5, A/B against the merge-base ac78acd3c5.

Verdict: the fix does what it says, and I could not find a regression. Recommending merge once it is brought up to date with main (it is 311 commits behind — see Merge readiness below, where I already validated the merged tree).

ANTHROPIC_API_KEY=… ANTHROPIC_BASE_URL=http://127.0.0.1:PORT \
  node <tree>/dist/cli.js --approval-mode yolo --model <model> -p "Read alpha.txt and beta.txt"

1. The primary bug reproduces, and the fix holds

One correction to how #8258 frames the impact. The issue says this "degrades gracefully (content dropped, not corrupted)". On the wire it is worse than that. main does not just drop SIG-EPISODE-TWO-BBBB — it emits a single thinking block whose thinking field is the concatenation of both episodes' text while still carrying episode one's signature. An Anthropic thinking signature is computed over that block's own text, so what main sends is a mis-signed block, not a merely lossy one. That moves the failure mode from "model loses replay context" toward "server-side signature verification has something to reject", which I think strengthens the case for merging rather than deferring.

2. Secondary behaviours, including the regression I most wanted to disprove

Scenario 5 is the one I went looking for a regression in. Removing the "hoist thinking to parts[0]" behaviour could plausibly break manual-mode extended thinking's leading-thinking requirement. It does not: with thinking:{type:'enabled'}, the new ensureLeadingThinkingOnToolUseAssistantMessages reproduces main's output byte-for-byte, including for the awkward [text, tool_use, thinking, tool_use] shape raised in the still-open thread on converter.test.ts:1177. That mechanism is real — the run is relocated even when it begins after a tool_use — but it is not a change in behaviour, and it is confined to manual mode. Adaptive mode is left in true chronological order (Scenario 4).

I also confirmed on the wire that interleaved-thinking-2025-05-14 is sent for both {type:'adaptive'} and {type:'enabled'}, so the premise behind the mergeConsecutiveAssistantMessages change is factually correct.

3. --resume fidelity

The session JSONL matches in-memory history exactly:

// PR — .qwen/projects/…/chats/<id>.jsonl
{"role":"model","parts":[
  {"text":"EPISODE-ONE: …","thought":true,"thoughtSignature":"SIG-EPISODE-ONE-AAAA"},
  {"functionCall":{"id":"toolu_alpha","name":"read_file",…}},
  {"text":"EPISODE-TWO: …","thought":true,"thoughtSignature":"SIG-EPISODE-TWO-BBBB"},
  {"functionCall":{"id":"toolu_beta","name":"read_file",…}}]}

// main — second signature gone, both texts under the first signature
{"role":"model","parts":[
  {"text":"EPISODE-ONE: …EPISODE-TWO: …","thought":true,"thoughtSignature":"SIG-EPISODE-ONE-AAAA"},
  {"functionCall":{"id":"toolu_alpha",…}},{"functionCall":{"id":"toolu_beta",…}}]}

Prompt-cache prefix stability also checks out: assistant turn 1 serializes identically across consecutive requests in a 3-turn manual-mode session. The only byte that moves between request #2 and #3 is the cache_control breakpoint relocating to the new last user message — identical on main.

4. Tests, mutation probes, merge readiness

I ran three mutation probes rather than trusting a green suite, because a passing E2E proves nothing if the harness cannot see the behaviour. Each mutation was applied to the PR source, rebundled, and re-run through the same real-CLI path; all three produce visibly wrong wire output, so the new code is load-bearing and the harness is non-vacuous.

Probe 1 is worth calling out: reverting the XML-recovery removal predicate to the pre-PR .text !== undefined makes the reasoning episode vanish entirely — text and signature — from the turn-2 request. That confirms the #8003 interaction described in the PR body is real. Note it is a hazard this PR's own restructuring creates (pre-PR, episodes never lived in consolidatedHistoryParts, so the bare check could not reach them) and then closes in the same diff. A/B against main shows no difference there, which is the correct outcome.

Merge readiness. The branch is 311 commits behind main, and main has touched geminiChat.ts six times since the merge-base. I merged main (ea872a4621) into the branch locally: no conflicts, 585/585 tests green on the merged tree, and Scenario 1 still passes E2E there. So the staleness is real but benign.

Residual items — none blocking, listed for the record

1. dropDanglingUnsignedTrailingThought's accepted false positive is real. A non-signing provider (DeepSeek) truncated mid-reasoning after a tool call loses its trailing reasoning from both history and the JSONL. The PR documents this and argues losing a fragment beats wedging a session, which I agree with. I did not reproduce it live — it needs a DeepSeek-shaped base URL — so this is code-reading only.
2. Media parts now persist to the session JSONL. Declared in the PR body, and correct for --resume fidelity, but it does mean model-produced base64 inlineData lands on disk where it previously never did. Worth watching for image-producing models. Not exercised by my harness.
3. Small doc-accuracy nit. The PR body says recordAssistantTurn "now records every consolidated part verbatim". Not quite: redactStructuredOutputArgsForRecording returns { functionCall } without spreading, so siblings on a functionCall part are dropped. In practice unreachable here — loggingContentGenerator.ts:1015 already builds { functionCall: part.functionCall } upstream — so this is wording, not behaviour.
4. Stale test count. The body's "369 across both files" is now 571 across the three touched test files (585 on the merged tree). Worth refreshing before merge.
5. 26 review threads are still open, but I read through them and none is a standing Critical at 6b3e68adc5: the two round-4 Criticals and the round-6 transport-continuation Critical are answered by the third and fourth dropDanglingUnsignedTrailingThought call sites, and round 7 raised Suggestions only.

Not covered by this verification

The real Anthropic API (mock only), the OpenAI Responses wire (#8169), and the DeepSeek provider path. Documented limitation 2 — two text-less signed thought parts concatenating into a signature valid for neither block — is unreachable on the Anthropic wire and so was not exercised here; it stays a genuine hazard for #8169 and is correctly flagged there.

ANTHROPIC_API_KEY=… ANTHROPIC_BASE_URL=http://127.0.0.1:PORT \
  node <tree>/dist/cli.js --approval-mode yolo --model <model> -p "Read alpha.txt and beta.txt"

@qwen-code /triage

Sandboxed verification: ✅ passed — merge-ready (agent verdict) - workflow run

Ran the PR in an isolated, token-free container: A/B against the base build, mock-free harness assertions, targeted gates. Advisory evidence for human reviewers — not a review, an approval, or a CI check.

Scripted assertions: 45 passed · 0 failed · 45 total

Flakiness gate: ✅ 3 changed test file(s) x 5 identical rounds, no divergence

rounds=5 files=3 skipped=0
file packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: (cd packages/core) npx --no-install vitest run ./src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts
file packages/core/src/core/anthropicContentGenerator/converter.test.ts: (cd packages/core) npx --no-install vitest run ./src/core/anthropicContentGenerator/converter.test.ts
file packages/core/src/core/geminiChat.test.ts: (cd packages/core) npx --no-install vitest run ./src/core/geminiChat.test.ts


per-file results (P=pass F=fail I=infra-exit, one letter per run):
  packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: PPPPP
  packages/core/src/core/anthropicContentGenerator/converter.test.ts: PPPPP
  packages/core/src/core/geminiChat.test.ts: PPPPP

verdict: pass
summary: 3 changed test file(s) x 5 identical rounds, no divergence

--- per-invocation detail (full copy in the artifact) ---
round 1 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 1 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 1 · packages/core/src/core/geminiChat.test.ts: P (exit 0)
round 2 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 2 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 2 · packages/core/src/core/geminiChat.test.ts: P (exit 0)
round 3 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 3 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 3 · packages/core/src/core/geminiChat.test.ts: P (exit 0)
round 4 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 4 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 4 · packages/core/src/core/geminiChat.test.ts: P (exit 0)
round 5 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 5 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 5 · packages/core/src/core/geminiChat.test.ts: P (exit 0)

Evidence images

Harness scripts and raw logs are in the workflow run artifacts (7-day retention).

— Qwen Code · sandboxed verification

⏸️ Deferring to @wenshao — the review is clean at 6b3e68adc5 (findings in the stage comments above), but the PR now changes 589 production lines in core, which crosses the two-tier rule's 500-line mark where the gate must hand the approval decision to a maintainer instead of casting the bot's vote. Your end-to-end verification and approval already stand on this commit; the remaining call is whether the second approval should be the bot's, a second human's, or an admin merge. The stale round-6 CHANGES_REQUESTED from this bot account (commit 2fe2ee32) still pins reviewDecision and can be dismissed once you pick a path, and the /verify report will land in the lifecycle comment. Needs a human call on this one.

Triage re-run completed without a new review.

⚠️ The bot's only review on 6b3e68adc53b4b7a4b367e12cef76dae7cbe3a87 is a COMMENTED one, which carries no vote — so it has no verdict of its own on this commit, and main needs two approving reviews: an approval left by another account is a separate vote and does not count as the bot's own. Two different things look like this, and the stage-3 comment above says which: the triage skill deferring on purpose at 3/5 — a fork refactor hitting the approval guardrail, or a core change escalated for maintainer awareness, both normal outcomes — or an earlier approval that a push dismissed, leaving only the comment behind, which needs a fresh review.

⚠️ 机器人在 6b3e68adc53b4b7a4b367e12cef76dae7cbe3a87 上唯一的评审是 COMMENTED，不带票 —— 因此它在该 commit 上没有自己的裁决，而 main 需要两个批准（其他账号的批准是另一张票）。有两种情况长这样，上方的 stage-3 评论会说明是哪一种：triage skill 在 3/5 时有意 defer（fork refactor 命中审批护栏，或核心改动被升级交由维护者把关，两者都是正常结果）；或者更早的批准被一次推送作废、只剩下这条评论，此时需要重新评审。

The stage comments above were updated with the latest result. View workflow run.

上方各阶段评论已更新为最新结果。查看工作流运行。

@qwen-code /triage

Maintainer re-verification — rebuilt the real harness at the current head

@netbrah @qqqys — following up on my 2026-08-23 verification, which was done at 6b3e68adc5. Since then the branch absorbed main's geminiChat.ts → llm-chat.ts rename plus four merges, and one new commit (14292a7342). That is exactly the situation where a fix quietly loses a limb, so I rebuilt the harness from scratch and re-ran everything at 19dcebfee6, A/B against the current merge-base 60161cb64a.

Verdict: the fix survives the rename intact, all previous conclusions still hold, and I found no regression. Still recommending merge. Two new findings below narrow the scope of two claims in the PR body — neither is a defect, and one of them makes the PR less risky than its own description suggests.

ANTHROPIC_API_KEY=… ANTHROPIC_BASE_URL=http://127.0.0.1:PORT ANTHROPIC_MODEL=… \
  node <dist>/cli.js --approval-mode yolo --model <model> -p "Read alpha.txt and beta.txt"

1. The fix still does what it says at the new head

All three re-confirm at 19dcebfee6. The middle panel is the new one: the scenario 14292a7342 added is reachable end-to-end. A tool-result continuation that answers with signed reasoning only — no text, no tool call — is retried by the no-progress loop until it is accepted (5 attempts in my run); on the PR both signed episodes land in the session JSONL, on main they collapse under SIG-QUIET-A.

I'll repeat the correction from last round because it is still the strongest argument for merging: on the wire, main does not drop the second signature, it emits a thinking block whose text is both episodes concatenated while still carrying the first episode's signature. That is a mis-signed block, not a lossy one.

2. Merge-damage check — the rename did not eat any of the fix

I diffed the PR's own added lines at the old head against the new head, rather than trusting a green suite:

• llm-chat.ts — 343 added lines on each side; the set difference is 4 lines, all mechanical: GeminiChat → LlmChat in one doc reference, and consolidatedHistoryParts → acceptedTurnParts in three places plus its new binding (main's quiet-completion placeholder). No behavioural line changed.
• converter.ts — 3 doc lines left the delta because main independently added the same text.
• anthropicContentGenerator.ts — 6 added lines, identical.

Suites on the merged tree: llm-chat.test.ts + converter.test.ts + anthropicContentGenerator.test.ts → 698 passed / 698. (The PR body still says 369; it was 571 at my last review. Worth refreshing before merge.)

3. Manual mode is still byte-identical; adaptive mode is where the wire actually changes

Same conclusion as last round, re-measured. History now stores the true chronological order, and in manual mode ensureLeadingThinkingOnToolUseAssistantMessages puts the wire back to exactly what main sends. The one genuine wire change is adaptive mode, where text now precedes thinking. The PR's argument for that is sound (interleaved-thinking-2025-05-14 is sent unconditionally whenever thinking is set — I re-confirmed that on the wire for both enabled and adaptive), but it is the one behaviour a mock cannot bless. If anyone has a live Anthropic key, that single request is the thing worth smoke-testing before merge.

4. New: two claims in the PR body are narrower than they read — both in the PR's favour

(a) "Each episode is preserved in its original position" is true of the algorithm but not observable on the Anthropic wire. I scripted a stream that genuinely interleaves — thinking(E1) → tool_use(alpha) → thinking(E2) → tool_use(beta) — and on the stock PR build history comes out as [E1, E2, alpha, beta], not [E1, alpha, E2, beta]. The cause is upstream of this PR: anthropicContentGenerator.ts buffers every tool_use block into deferredToolCalls and flushes the whole batch at message_delta, so llm-chat.ts never sees a tool call between two episodes. That code is pre-existing and byte-identical at the merge-base. To prove the attribution I built a probe arm with one line changed (yield tool_use inline instead of deferring): the PR then produces true interleaving all the way to the wire and the JSONL, while main still collapses to one mis-signed block. So the algorithm is right, and the ordering sentence in the description is describing something the Anthropic wire cannot show today. Episode↔episode and episode↔text ordering do reach the wire (§3) — it is specifically the interleaving with tool calls that does not.

(b) dropDanglingUnsignedTrailingThought's accepted false positive is unreachable on this wire — and so is call site #1's protection. Last round I flagged this as code-reading only because it needs a DeepSeek-shaped endpoint. This time I went after it directly: scripted tool_use → thinking(no signature_delta) so the unsigned episode is genuinely last in the stream. The same deferredToolCalls batching means the functionCall is always the last part of a tool-use turn, so the episode can never be trailing there — the guard does not fire, and PR and main are identical. The OpenAI-compatible converter batches the same way (getCompletedToolCalls() runs only on finish_reason), so by inspection the same holds there; I did not run that wire. Net: the documented false positive costs nothing on either real wire today, and call site #1 is correspondingly inert there. Call sites #2–#4 (XML recovery, recovery-coalescing, transport continuation) are unaffected and stay live.

5. Mutation probes — the harness is not vacuous

Four mutations, each applied to PR source, re-bundled, re-run through the same real-CLI path; 4 / 4 killed. Two worth calling out:

• M2 (disable the episode-split condition) reproduces documented limitation Where is the config saved? #2 exactly — one block carrying SIG-EPISODE-ONE-AAAASIG-EPISODE-TWO-BBBB, a signature valid for neither block. That is direct evidence the split condition is the thing keeping that shape unreachable, which is the load-bearing claim behind limitation Where is the config saved? #2 being acceptable.
• M3 (revert the XML-recovery predicate to the pre-PR .text !== undefined) makes the reasoning episode vanish — text and signature — from both wire and JSONL. The Model outputs XML-style tool calls as plain text instead of structured function calls in long sessions #8003 interaction described in the PR body is real.

Merge readiness

56 commits behind main (was 311). Main has not touched llm-chat.ts since the merge-base; one commit (#10896) touched the anthropic directory. git merge-tree against origin/main@e09a45c5 produces zero conflicts. PR CI at this head is green across Test, Lint & Static, Integration (no-AK), Desktop Shell and web-shell E2E.

reviewDecision is still CHANGES_REQUESTED, pinned by the bot's own review on 2fe2ee32b4 (2026-08-12) — six commits stale. That is the deadlock, not a standing objection: of the 26 unresolved review threads, every [Critical] is marked outdated and answered by a later commit, and everything current is a [Suggestion].

Residuals — unchanged, none blocking

1. Media parts now persist to the session JSONL. Declared in the PR body and correct for --resume fidelity. Still not exercised here, and it cannot be on this wire: an Anthropic assistant message carries only text / thinking / tool_use, and the response path never builds an inlineData part. It stays a Gemini-wire consideration.
2. Doc-accuracy nit (unchanged): the body says recordAssistantTurn "records every consolidated part verbatim". redactStructuredOutputArgsForRecording returns { functionCall } without spreading, so siblings on a functionCall part are dropped — unreachable in practice, so wording only.
3. Stale test count in the body — 369 → 698.
4. Two one-line description edits would help a future reader: the ordering claim in §4(a), and noting that limitation 如何自定义密钥文件 .env可能与其他文件冲突 #3's false positive is unreachable on the wires shipped today (§4(b)).

Not covered by this verification

The real Anthropic API (mock only — see §3 for the one request worth a live smoke test), the OpenAI Responses wire (#8169), and the DeepSeek provider path other than by inspection. Documented limitation #2 remains unreachable on the Anthropic wire and is correctly flagged for #8169.

@qwen-code /triage

Sandboxed verification: ❌ not passed — findings reported (agent verdict) - workflow run

Ran the PR in an isolated, token-free container: A/B against the base build, mock-free harness assertions, targeted gates. Advisory evidence for human reviewers — not a review, an approval, or a CI check.

Scripted assertions: 57 passed · 0 failed · 57 total

Flakiness gate: ✅ 3 changed test file(s) x 5 identical rounds, no divergence

cd packages/core && npx vitest run src/core/geminiChat.test.ts src/core/anthropicContentGenerator/converter.test.ts

rounds=5 files=3 skipped=0
file packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: (cd packages/core) npx --no-install vitest run ./src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts
file packages/core/src/core/anthropicContentGenerator/converter.test.ts: (cd packages/core) npx --no-install vitest run ./src/core/anthropicContentGenerator/converter.test.ts
file packages/core/src/core/llm-chat.test.ts: (cd packages/core) npx --no-install vitest run ./src/core/llm-chat.test.ts


per-file results (P=pass F=fail I=infra-exit, one letter per run):
  packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: PPPPP
  packages/core/src/core/anthropicContentGenerator/converter.test.ts: PPPPP
  packages/core/src/core/llm-chat.test.ts: PPPPP

verdict: pass
summary: 3 changed test file(s) x 5 identical rounds, no divergence

--- per-invocation detail (full copy in the artifact) ---
round 1 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 1 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 1 · packages/core/src/core/llm-chat.test.ts: P (exit 0)
round 2 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 2 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 2 · packages/core/src/core/llm-chat.test.ts: P (exit 0)
round 3 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 3 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 3 · packages/core/src/core/llm-chat.test.ts: P (exit 0)
round 4 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 4 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 4 · packages/core/src/core/llm-chat.test.ts: P (exit 0)
round 5 · packages/core/src/core/anthropicContentGenerator/anthropicContentGenerator.test.ts: P (exit 0)
round 5 · packages/core/src/core/anthropicContentGenerator/converter.test.ts: P (exit 0)
round 5 · packages/core/src/core/llm-chat.test.ts: P (exit 0)

Evidence images

Harness scripts and raw logs are in the workflow run artifacts (7-day retention).

— Qwen Code · sandboxed verification