fix(responses): scope combo continuation replay - #1888
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📝 WalkthroughWalkthroughThe response router now validates continuation state against provider ownership, preserves scoped replay snapshots across combo and failover requests, and restores validated Cursor and provider metadata. OAuth snapshots include pseudonymous account identity data. Tests cover replay provenance, malformed state, provider and credential changes, OAuth continuity, persistence, and ownerless Cursor state. ChangesProvider-bound continuation state
Estimated code review effort: 5 (Critical) | ~90 minutes Merge Risk: 🔵 Low · up to The change is otherwise well verified, but persisted continuation state may be rejected when reserved owner metadata is treated as provider state; this is a bounded correctness issue that should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant Client
participant ParentResponseRouter
participant ContinuationState
participant ChildResponseRouter
participant ProviderAdapter
Client->>ParentResponseRouter: Send continuation request
ParentResponseRouter->>ContinuationState: Validate thread scope and provider owner
ContinuationState-->>ParentResponseRouter: Return valid continuation snapshot
ParentResponseRouter->>ChildResponseRouter: Pass comboReplaySnapshot
ChildResponseRouter->>ContinuationState: Copy replay provenance
ChildResponseRouter->>ProviderAdapter: Send sanitized continuation payload
ProviderAdapter-->>ChildResponseRouter: Return response and continuation state
ChildResponseRouter->>ContinuationState: Persist state with provider owner
Possibly related PRs
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Exact head is now Author validation: Bun 1.3.14 and Bun 1.4 owner/replay matrix 11/11 on each runtime; the broader Responses-state + Combo suite passed 164 tests on Bun 1.3.14; typecheck, privacy scan, and diff check passed. The same-slot OAuth account-isolation regression is covered. The exact-head follow-up also validates reserved Because this head touches |
Wibias
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Wibias
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Blocking issue: valid Kiro/Cursor continuation state is dropped for every Combo child.
The PR says provider continuation ownership should stay target-local, but the implementation is broader: whenever comboReplaySnapshot exists, handleResponsesInner() skips restoring both parsed._providerContinuation and parsed._cursorConversationId from previous_response_id state.
That prevents cross-target leakage, but it also disables valid same-target continuation.
For Kiro this is a functional regression. stableConversationId() first reads parsed._providerContinuation?.kiro?.conversationId; when that is absent it generates a new UUID. So even a Combo with one Kiro target can get a new upstream conversation on each previous_response_id turn despite no provider/account change.
Cursor has the same ownership problem for clients without x-codex-parent-thread-id: without the remembered _cursorConversationId, it falls back to a new generated conversation id.
The new test combo child retains the local id without inheriting unbound provider state currently locks in this blanket suppression by asserting the provider continuation is always undefined. That is stronger than the stated target-local requirement.
I would not restore provider state unconditionally, since that would recreate the cross-provider/account leak this PR is fixing. Instead, continuation state needs an owner identity and should be restored only after the concrete child target is known and matches that stored owner.
Please add regression coverage for at least:
- Same Kiro target + same credential across turns keeps the same Kiro conversation id.
- Same Cursor target without
x-codex-parent-thread-idkeeps its remembered conversation id. - Failover to a different provider does not inherit old provider state.
- Same provider with a different account/credential does not inherit old provider state.
The rest of the replay-scoping change looks sound: parent-level client-thread validation, one materialized failover snapshot, and WeakMap replay-provenance restoration are all the right direction.
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Inline comments:
In `@src/server/responses/core.ts`:
- Around line 4271-4278: Update the key-pool failover path around
buildContinuationRequest and bindProviderContinuationForRoute so a rotated
credentialIdentity does not cause sameProviderContinuationOwner to reject and
delete nextParsed._providerContinuation. Preserve the existing provider
continuation on nextParsed for Kiro and Cursor, while still updating the outer
parsed owner binding used by response persistence.
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src/responses/reasoning-replay-cache.tssrc/responses/state.tssrc/server/responses/core.tssrc/types.tstests/responses-state.test.tstests/server-combo-failover-e2e.test.ts
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@Wibias Please re-review exact head The four regressions requested in the prior review remain covered: same-target Kiro + credential continuation, same-target Cursor without a parent-thread header, different-provider failover isolation, and different account/credential isolation. Identityless or email-only same-slot OAuth replacement also fails closed, while identity-bearing token refresh/reload remains continuous. The latest CodeRabbit finding is addressed in |
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Inline comments:
In `@src/server/responses/core.ts`:
- Around line 392-399: Add a concise comment at the empty-payload check in
providerContinuationPayload explaining that an owner-only record must return
undefined rather than an empty continuation object, preserving the
immutable-empty-snapshot behavior.
- Around line 2414-2435: Update the continuation-state merge around
providerContinuationPayload to generically deep-merge each provider key from
inherited and emitted payloads, rather than special-casing kiro and cursor.
Preserve cursorConversationId overriding the merged cursor.conversationId and
retain the existing __ocxOwner behavior, while ensuring partial emitted
sub-objects for any provider keep inherited fields.
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src/server/responses/core.ts
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Inline comments:
In `@src/server/responses/core.ts`:
- Around line 1444-1451: Update validPayload() so the reserved __ocxOwner entry
is excluded from Object.values(payload.providers) provider-state validation,
while validating its owner metadata separately. Preserve validation for all
actual provider-state entries and use the existing owner metadata rules.
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src/oauth/index.tssrc/server/responses/core.tssrc/types.tstests/responses-state.test.tstests/server-combo-failover-e2e.test.ts
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@coderabbitai review @Wibias Please re-review exact head
Exact-head focused validation is 69/69 on Bun 1.3.14 and Bun 1.4.0-canary.1; typecheck, privacy scan, and diff check pass on both. All current inline threads are resolved and the readiness checklist is 4/4. @lidge-jun Maintainer action is still needed for security review and the |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
target='3b04d3f817644d60e10f7addeb3d3b86e4574c80'
printf '%s\n' '== checked-out commit =='
git rev-parse HEAD
printf '%s\n' '== target commit =='
git cat-file -t "$target"
printf '%s\n' '== target parents =='
git show -s --format='%H%n%P%n%s' "$target"
printf '%s\n' '== changed files from first parent =='
git diff-tree --no-commit-id --name-status -r "$target"
printf '%s\n' '== changed-symbol outlines =='
for f in src/server/responses/core.ts src/oauth/index.ts src/responses/state.ts src/responses/reasoning-replay-cache.ts src/types.ts tests/server-combo-failover-e2e.test.ts tests/responses-state.test.ts; do
if [ -f "$f" ]; then
echo "--- $f"
ast-grep outline "$f" --items all || true
fi
done
printf '%s\n' '== exact diff, relevant files =='
git diff --find-renames --unified=50 "${target}^" "$target" -- \
src/server/responses/core.ts src/oauth/index.ts src/responses/state.ts \
src/responses/reasoning-replay-cache.ts src/types.ts \
tests/server-combo-failover-e2e.test.ts tests/responses-state.test.tsLength of output: 95606 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '== continuation ownership and route binding =='
sed -n '285,455p' src/server/responses/core.ts
printf '%s\n' '== final route normalization and its call sites =='
sed -n '1240,1415p' src/server/responses/core.ts
rg -n -C 5 '\bbindRouteReasoningReplayScope\s*\(|\bapplyFinalRouteRequestNormalization\s*\(' src/server/responses/core.ts
printf '%s\n' '== Cursor token resolver =='
cursor_transport=$(fd -a '^live-transport\.ts$' src)
printf '%s\n' "$cursor_transport"
sed -n '1,240p' "$cursor_transport"
printf '%s\n' '== Cursor identity scope consumers =='
rg -n -C 8 '_cursorIdentityScope|conversationId|thread continuity|threadContinuity' src/adapters src/responses src/server --glob '*.ts'
printf '%s\n' '== state storage of provider continuation =='
sed -n '960,1100p' src/responses/state.ts
sed -n '1150,1230p' src/responses/state.ts
printf '%s\n' '== OAuth account store identity normalization =='
store_file=$(fd -a '^store\.ts$' src/oauth)
printf '%s\n' "$store_file"
rg -n -C 6 'function saveCredential|export async function saveCredential|accountId|trim\(' "$store_file"
printf '%s\n' '== focused Cursor test remainder =='
sed -n '2660,2920p' tests/server-combo-failover-e2e.test.tsLength of output: 171580 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '== initial binding, selected headers, and adapter dispatch =='
sed -n '2180,2380p' src/server/responses/core.ts
sed -n '2380,2490p' src/server/responses/core.ts
printf '%s\n' '== all later scope rebind contexts =='
for range in '720,785' '3380,3455' '3460,3535' '3890,3960' '3970,4035' '4260,4340'; do
echo "--- src/server/responses/core.ts:$range"
sed -n "${range}p" src/server/responses/core.ts
done
printf '%s\n' '== active adapter runTurn input construction =='
rg -n -C 12 '\.runTurn\s*\(|incoming:|headers: selectedForwardHeaders|selectedForwardHeaders|forwardHeaders' \
src/server/responses/core.ts --glob '*.ts'
printf '%s\n' '== scope-binding test coverage and retry test coverage =='
rg -n -C 5 'cursor.*(retry|rekey|bearer|token|scope)|bindRouteReasoningReplayScope|_cursorIdentityScope' \
tests src --glob '*.test.ts' --glob '*.ts'
printf '%s\n' '== commit parent comparison of retry binding contexts =='
git diff --unified=20 '3b04d3f817644d60e10f7addeb3d3b86e4574c80^' \
'3b04d3f817644d60e10f7addeb3d3b86e4574c80' -- src/server/responses/core.tsLength of output: 122844
I found no new actionable issues. Key checks completed:
I did not rerun the reported Bun test matrix in this sandbox. Action performedReview triggered.
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2 participants
Summary
previous_response_idexactly once under the normalized client-thread scope and reuse one immutable parent snapshot across failover attemptsresponses-state.jsoncontains no reusable secret verifierExact base:
4ef1fcacfaf96e6ee7a9a19b9c483923db4a2474Exact head:
3b04d3f817644d60e10f7addeb3d3b86e4574c80Verification
tests/server-combo-failover-e2e.test.ts— 69 pass, 0 fail, 451 assertionsbun run typecheck,bun run privacy:scan, andgit diff --checkpassed on Bun 1.3.14 and Bun 1.4.0-canary.177b3817137c6ad36cdb42994f1beb1bb0978a5e9tests/api-storage-policy-put-race.test.tswere attempted once and hit the same Bun internal assertion crash before any feature-path assertion failure; equivalent runs were not repeated, and maintained CI remains the authoritative full-suite gateNo GUI files changed, so no screenshot is required.
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