fix(agent): make managed-fallback provisional buffer limits configurable via env - #4602
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MERGE_READY — maintainer fix-forward executed (terminal disposition pending independent exact-head approval) Exact head / base / CI
Root defects found in the submitted head (all fixed forward)
Reproduction / validation (all at
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Bounded hold evidence — awaiting independent exact-head approval (signed) State at
Blocker (single, human): @snowykr — an APPROVED review on this exact head. Per the enforced contract, the check turns green on that review ( — |
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Rebuilt onto live dev Why the previous verdict was replacedThe prior PR-body verdict declared Exact head / base / digest
Semantic conflict resolution (vs #4610, now on dev)dev gained superseded-delta reclamation in the same staging path. Resolution: Validation at the exact head (local)
Owner / blocker / nextSingle blocker: an authenticated non-author APPROVED GitHub review at — |
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Rebased onto live dev Exact head / base / digest (current)
Semantic resolution (unchanged in substance)
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Reconstructed onto current dev Exact head / base / digest (current, authoritative)
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Signed status @ head
Blocker (only): one authenticated non-author APPROVED review at — |
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Signed status @ head Reconciliation against fresh dev (this push)
Product CI at the prior head
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…ow (#4618) ManagedAttemptBufferOverflowError surfaced as one static sentence, so a subagent killed by the provisional staging cap was indistinguishable from a provider or context-window failure — the exact misread reported in recordored." and the error text carried no stage, counts, or limits. The overflow now reports its shape everywhere it can reach: - agent: the typed error carries stage, staged event/byte counts at rejection, and both caps; the message keeps its stable prefix (session retry policy prefix-classifies on it) and appends a shape-only parenthetical stating this is a local staging-buffer limit that reproduces on re-issue, not a provider/context-window failure. Baked into the error itself because the non-retryable local exit path surfaces the thrown error, not the managedFailureMessage wrapper. - coding-agent: the executor retains a bounded, redaction-safe localErrorSummary (closed kind set, sanitized summary) from the subagent's terminal assistant error; receipt preview, errorSummary, subagent tool output, and the await renderer name the local kind and carry the diagnostic instead of the generic error preview. Does not touch cap configurability (#4602) or superseded-delta reclamation (#4610). Lore-id: 4618-buffer-diagnostics Constraint: message prefix must stay byte-identical for session prefix classification Constraint: diagnostics must be shape-only (no provider/prompt text can reach a parent receipt) Constraint: do not duplicate #4602 configurability or #4610 delta reclamation Rejected: enriching managedFailureMessage only | the non-retryable local exit surfaces the thrown error, not the wrapper Rejected: enlarging the caps | workaround path ships with #4602 Confidence: high Scope-risk: moderate Reversibility: trivial Tested: byte-cap + event-cap surfaced diagnostics (agent), propagation, redaction, foreign-kind degradation, generic-error fallback isolation (coding-agent) Not-tested: live provider delta-storm reproduction Closes: #4618
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Signed status @ head Check-rollup triage (no product failure)The failing rollup entries at this head come from exactly two runs:
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Independent maintainer review — merge blocked.
major — the memory guard becomes disableable
packages/agent/src/agent-loop.ts:98-124: $envpos accepts any positive safe integer, so an operator can set the event/byte limits near Number.MAX_SAFE_INTEGER and effectively remove the provisional-staging memory guard entirely. The failure mode then moves from a bounded, typed local_buffer_overflow to process OOM — strictly worse, and much harder to diagnose.
Required:
- documented hard ceilings
- above-ceiling values clamp to the ceiling with a warning, rather than being honoured (this is the existing session-context budget convention in this repo — follow it)
- boundary-value tests: at ceiling, above ceiling, zero, negative, non-numeric
otherwise
Environment variables are a defensible operator surface for a low-level staging knob, so the mechanism choice is fine. The problem is purely that it is unbounded.
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…ow (#4618) ManagedAttemptBufferOverflowError surfaced as one static sentence, so a subagent killed by the provisional staging cap was indistinguishable from a provider or context-window failure — the exact misread reported in recordored." and the error text carried no stage, counts, or limits. The overflow now reports its shape everywhere it can reach: - agent: the typed error carries stage, staged event/byte counts at rejection, and both caps; the message keeps its stable prefix (session retry policy prefix-classifies on it) and appends a shape-only parenthetical stating this is a local staging-buffer limit that reproduces on re-issue, not a provider/context-window failure. Baked into the error itself because the non-retryable local exit path surfaces the thrown error, not the managedFailureMessage wrapper. - coding-agent: the executor retains a bounded, redaction-safe localErrorSummary (closed kind set, sanitized summary) from the subagent's terminal assistant error; receipt preview, errorSummary, subagent tool output, and the await renderer name the local kind and carry the diagnostic instead of the generic error preview. Does not touch cap configurability (#4602) or superseded-delta reclamation (#4610). Lore-id: 4618-buffer-diagnostics Constraint: message prefix must stay byte-identical for session prefix classification Constraint: diagnostics must be shape-only (no provider/prompt text can reach a parent receipt) Constraint: do not duplicate #4602 configurability or #4610 delta reclamation Rejected: enriching managedFailureMessage only | the non-retryable local exit surfaces the thrown error, not the wrapper Rejected: enlarging the caps | workaround path ships with #4602 Confidence: high Scope-risk: moderate Reversibility: trivial Tested: byte-cap + event-cap surfaced diagnostics (agent), propagation, redaction, foreign-kind degradation, generic-error fallback isolation (coding-agent) Not-tested: live provider delta-storm reproduction Closes: #4618
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Review fix-forward landed @ head The review finding and its fix@probepark's review at All three requirements are implemented in this head (
Exact head / base / digest
Validation at this head (local, re-run after rebase)
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Independent maintainer review at exact head e3dc3212 — merge blocked. The env-parsing half of the prior finding is fixed; the half that actually prevents the OOM is not.
what is fixed
agent-loop.ts:110-121: values parse through $envpos; invalid, zero, negative, non-digit, and unsafe integers fall back to the documented defaults; above-ceiling safe integers clamp with a logger.warn. Defaults and ceilings match between code and docs/environment-variables.md. The knob can no longer be used to switch the guard off, which was the specific hole I care about.
the bound behaves sensibly where it applies
Worth recording, because the design is right even though the accounting is not:
#wouldOverflow tests count + 1 > cap || bytes + incoming > cap, so exactly-at-cap is accepted. On overflow, managed mode first removes superseded text_delta, thinking_delta, reasoning_summary_delta, and toolcall_delta entries — it does not drop the oldest or newest frame. If structural and full frames still do not fit, it discards the whole attempt and throws a typed local_buffer_overflow. Non-managed mode flushes the batch and streams through losslessly.
So there is no silent truncation: a legitimate oversized managed response is visibly rejected, and the surviving sequence stays coherent because start/end and terminal full-message frames remain while both copies of a delta are removed together. The local overflow carries no transport facts, does not call onManagedAttemptOutcome, consumes no fallback/retry/resample budget, and terminates rather than looping. Compaction and discard replace #batch wholesale, so dropped frames are collectible.
major — the counters do not charge everything the batch retains
agent-loop.ts:107-108,1270-1272,1331-1339,1451-1452,1581-1587.
The advertised ceilings are 10,000,000 events and 4 GiB of counted JSON. But stageAssistantMessageEvent() puts an additional detached message/event pair into #batch without incrementing either counter, and managed streaming stages that pair before pushing the corresponding measured message_update (:3141-3165).
Two consequences:
- Actual retention can exceed 4 GiB and millions of extra objects while both counters still read under cap.
- The uncharged snapshot is allocated before the measured check runs, so the allocation that kills the process happens ahead of the guard that was supposed to prevent it.
An ordinary host can therefore still OOM before the typed overflow fires — which is the exact property the previous review asked this PR to guarantee. A bound that does not count what it retains is not a bound.
Fix: charge every retained batch item, or stop taking the callback snapshot when it is not needed, and then set the hard ceiling from total retained memory at a value a real machine survives. 4 GiB of counted JSON is already past what most hosts tolerate once the uncounted pair is included.
minor — the at-ceiling test the prior review asked for is still missing
test/managed-attempt-transaction.test.ts:1389-1420 supplies 10000001 and 4294967297 — one above each ceiling — never exactly 10000000 or 4294967296. Since #wouldOverflow deliberately accepts equality, the boundary is the interesting value and it is untested. The test also only inspects getter results; it never drives a transaction past the clamped ceiling, so its own comment about rejection above the clamp is unproven.
Add both exact-ceiling cases and a transaction-level test using injectable small ceilings.
coverage
Two of six added tests pin real behavior, and both do it by lowering the caps rather than by exercising the shipped ones:
honors GJC_FALLBACK_MAX_STAGED_EVENTS— base ignores the knob, five events stay under the 10,000 default, overflow assertions fail. Genuine pin.honors GJC_FALLBACK_MAX_STAGED_BYTES— base ignores 128, a ~4 KiB event stays under 16 MiB. Genuine pin.
The two fallback tests (non-positive, non-digit) pass on base for the same reason they pass at head — base ignores the knob and uses its default — so they are guards, not pins, and they never cross a bound. The clamp test and the zero/negative/non-numeric test pin the new helper exports at parser level only.
Net: configuration parsing is well covered; the shipped ceilings are not enforced end to end by any test.
body accuracy
Supported by the code: documented defaults, read-once transaction fields, the shared managed/lossless limiter, digits-only positive parsing, fallback on invalid input, above-ceiling clamp warning, and the non-retryable typed terminal error.
Not supported: the claim that boundary tests cover values at the ceiling, and the implication that the clamped ceiling is exercised end to end.
sweep
No new any, ReturnType<>, inline dynamic imports, console.*, or raw Promise constructor. Changelog entry under ## [Unreleased]. git diff --check dev...HEAD clean.
Reviewed by @probepark — method: detached worktree at e3dc3212, read of the limiter and every #batch insertion site to reconcile what is retained against what is counted, allocation-vs-check ordering trace through managed streaming, overflow-path behavior analysis for truncation and ordering coherence, budget/loop-termination check, per-test base-vs-head discrimination. Tests not executed.
gajae.pr-review-verdict.v1 merge-blocked sha256:1411ddcabede9fc4e6df496fcc1713fcc04c06b21dcfe6a4110ddb383d527d8c reviewer:human reviewer-id:probepark evidence:exact-head-e3dc3212-uncounted-batch-retention-lets-the-process-oom-before-the-typed-overflow
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Verdict: CHANGES_REQUESTED
Summary
The configurable provisional-buffer limits address a real managed-fallback failure mode, but the new accounting does not cover every retained snapshot. That leaves the advertised hard ceiling unable to prevent the memory exhaustion it is meant to isolate. The configuration source and test coverage also need tightening before this can be relied upon.
Findings / Required Changes
-
[P1]
packages/agent/src/agent-loop.ts:1297-1299, 1331-1342, 2214-2215, 3158— account for every retained snapshot, not only#stage()event entries.
stageAssistantMessageEvent()retains detached assistant/event snapshots in#batchwithout incrementing#stagedEventCountor#stagedBytes. Those objects are allocated before the measuredmessage_updatepath, so a transaction can exceed the documented 4 GiB / 10M ceilings and OOM beforelocal_buffer_overflowis raised. Charge all retained surfaces (or eliminate the duplicate snapshot path) and add a callback-enabled low-cap regression that proves overflow occurs before unbounded retention. -
[P2]
packages/agent/src/agent-loop.ts:115-120, 1297-1299— do not let a repository-controlled.envweaken a defensive resource guard.
The resolved environment includes the current repository's.env, so a project can raise these limits to multi-gigabyte / multi-million values, or reduce them enough to force local failures. Resolve these guardrails from a trusted configuration source, or explicitly prevent project.envvalues from changing them; add a regression covering the project-.envtrust boundary. -
[P2]
packages/agent/test/managed-attempt-transaction.test.ts:1237-1423anddocs/environment-variables.md:456-457— cover the documented contract at its boundaries and in ordinary mode.
The new end-to-end coverage is managed-only. Add ordinary lossless-staging tests for low event/byte caps, including callback preservation and flush/pass-through behavior. Add exact-ceiling and above-ceiling assertions, plus a transaction-level test with injectable small caps; the current parser-only checks do not exercise the equality behavior used by#wouldOverflow. -
[P3]
packages/agent/test/managed-attempt-transaction.test.ts:99-102— restore inherited environment values after each test.
The new cleanup deletesGJC_FALLBACK_MAX_STAGED_EVENTSandGJC_FALLBACK_MAX_STAGED_BYTESinstead of restoring their original values. This makes host/CI overrides leak into early tests and disappear for later same-process tests. Snapshot both variables before the suite and restore the exact prior state; clear them only within tests that require defaults.
CI / Verification
- No PR code was executed locally for this review.
- Existing GitHub Dev CI run
32158200319was still in progress at review time: affected-plan and GJC state-gate were green; native build and affected test/check shards had not completed. - PR contract run
32158200654failed only at theneeds human ciapproval gate; that failure is excluded from this assessment.
Axis Coverage
- A1 — Intent / Policy / Contract: reviewed; test environment restoration is required for deterministic configuration-contract coverage.
- A2 — Architecture / Correctness / Failure: reviewed; incomplete retained-object accounting blocks approval.
- A3 — Security / Privacy / Trust: reviewed; repository-controlled environment input must not weaken a resource-safety guard.
- A4 — Verification / Tests / CI: reviewed from existing artifacts and changed tests only; CI remains pending and boundary/non-managed coverage is missing.
- A5 — Context / Compatibility / Platform: reviewed; no separate compatibility or platform blocker identified.
…ow (#4618) ManagedAttemptBufferOverflowError surfaced as one static sentence, so a subagent killed by the provisional staging cap was indistinguishable from a provider or context-window failure — the exact misread reported in recordored." and the error text carried no stage, counts, or limits. The overflow now reports its shape everywhere it can reach: - agent: the typed error carries stage, staged event/byte counts at rejection, and both caps; the message keeps its stable prefix (session retry policy prefix-classifies on it) and appends a shape-only parenthetical stating this is a local staging-buffer limit that reproduces on re-issue, not a provider/context-window failure. Baked into the error itself because the non-retryable local exit path surfaces the thrown error, not the managedFailureMessage wrapper. - coding-agent: the executor retains a bounded, redaction-safe localErrorSummary (closed kind set, sanitized summary) from the subagent's terminal assistant error; receipt preview, errorSummary, subagent tool output, and the await renderer name the local kind and carry the diagnostic instead of the generic error preview. Does not touch cap configurability (#4602) or superseded-delta reclamation (#4610). Lore-id: 4618-buffer-diagnostics Constraint: message prefix must stay byte-identical for session prefix classification Constraint: diagnostics must be shape-only (no provider/prompt text can reach a parent receipt) Constraint: do not duplicate #4602 configurability or #4610 delta reclamation Rejected: enriching managedFailureMessage only | the non-retryable local exit surfaces the thrown error, not the wrapper Rejected: enlarging the caps | workaround path ships with #4602 Confidence: high Scope-risk: moderate Reversibility: trivial Tested: byte-cap + event-cap surfaced diagnostics (agent), propagation, redaction, foreign-kind degradation, generic-error fallback isolation (coding-agent) Not-tested: live provider delta-storm reproduction Closes: #4618
…ow (#4618) ManagedAttemptBufferOverflowError surfaced as one static sentence, so a subagent killed by the provisional staging cap was indistinguishable from a provider or context-window failure — the exact misread reported in recordored." and the error text carried no stage, counts, or limits. The overflow now reports its shape everywhere it can reach: - agent: the typed error carries stage, staged event/byte counts at rejection, and both caps; the message keeps its stable prefix (session retry policy prefix-classifies on it) and appends a shape-only parenthetical stating this is a local staging-buffer limit that reproduces on re-issue, not a provider/context-window failure. Baked into the error itself because the non-retryable local exit path surfaces the thrown error, not the managedFailureMessage wrapper. - coding-agent: the executor retains a bounded, redaction-safe localErrorSummary (closed kind set, sanitized summary) from the subagent's terminal assistant error; receipt preview, errorSummary, subagent tool output, and the await renderer name the local kind and carry the diagnostic instead of the generic error preview. Does not touch cap configurability (#4602) or superseded-delta reclamation (#4610). Lore-id: 4618-buffer-diagnostics Constraint: message prefix must stay byte-identical for session prefix classification Constraint: diagnostics must be shape-only (no provider/prompt text can reach a parent receipt) Constraint: do not duplicate #4602 configurability or #4610 delta reclamation Rejected: enriching managedFailureMessage only | the non-retryable local exit surfaces the thrown error, not the wrapper Rejected: enlarging the caps | workaround path ships with #4602 Confidence: high Scope-risk: moderate Reversibility: trivial Tested: byte-cap + event-cap surfaced diagnostics (agent), propagation, redaction, foreign-kind degradation, generic-error fallback isolation (coding-agent) Not-tested: live provider delta-storm reproduction Closes: #4618
…ow (#4618) ManagedAttemptBufferOverflowError surfaced as one static sentence, so a subagent killed by the provisional staging cap was indistinguishable from a provider or context-window failure — the exact misread reported in recordored." and the error text carried no stage, counts, or limits. The overflow now reports its shape everywhere it can reach: - agent: the typed error carries stage, staged event/byte counts at rejection, and both caps; the message keeps its stable prefix (session retry policy prefix-classifies on it) and appends a shape-only parenthetical stating this is a local staging-buffer limit that reproduces on re-issue, not a provider/context-window failure. Baked into the error itself because the non-retryable local exit path surfaces the thrown error, not the managedFailureMessage wrapper. - coding-agent: the executor retains a bounded, redaction-safe localErrorSummary (closed kind set, sanitized summary) from the subagent's terminal assistant error; receipt preview, errorSummary, subagent tool output, and the await renderer name the local kind and carry the diagnostic instead of the generic error preview. Does not touch cap configurability (#4602) or superseded-delta reclamation (#4610). Lore-id: 4618-buffer-diagnostics Constraint: message prefix must stay byte-identical for session prefix classification Constraint: diagnostics must be shape-only (no provider/prompt text can reach a parent receipt) Constraint: do not duplicate #4602 configurability or #4610 delta reclamation Rejected: enriching managedFailureMessage only | the non-retryable local exit surfaces the thrown error, not the wrapper Rejected: enlarging the caps | workaround path ships with #4602 Confidence: high Scope-risk: moderate Reversibility: trivial Tested: byte-cap + event-cap surfaced diagnostics (agent), propagation, redaction, foreign-kind degradation, generic-error fallback isolation (coding-agent) Not-tested: live provider delta-storm reproduction Closes: #4618
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Rebased onto current dev probepark re-review @
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Re-review at exact head 2efaf269 — merge blocked. Three of six prior findings are fixed; the OOM blocker is not, and the new guard cannot bound what it is meant to bound.
fixed
- above-
MAX_SAFE_INTEGERvalues now clamp rather than silently defaulting (agent-loop.ts:136-178). - direct callbacks no longer clone twice or break pairing (
:1694-1704,:1728-1735). - changelog — HEAD adds only the cap bullet at
packages/agent/CHANGELOG.md:9, with no duplicated heading or unrelated entry.
major — the guard cannot stop the traversal it is guarding
agent-loop.ts:1160-1173:
const json = JSON.stringify(value, (_key, chunk) => {
if (typeof chunk === "string") {
seen += chunk.length;
if (seen > limit) return "";
}
...
return chunk;
});Returning "" substitutes a value; it does not abort. JSON.stringify keeps walking the entire structure and keeps building the result string, so everything traversed before the limit is crossed is fully materialized — up to roughly the 1 GiB ceiling. Materializing that is the OOM the guard exists to prevent, and a payload split across many individually-small strings walks straight into it.
Two secondary issues compound it: chunk.length is UTF-16 code units, so it undercounts UTF-8 bytes for any non-ASCII content, and structuredClone can already have run before the exact check at :1180.
Fix: throw a sentinel from the replacer once seen > limit and catch it around the stringify — that is the one way to actually terminate the walk. Count UTF-8 bytes rather than UTF-16 units, or state the undercount as deliberate and size the budget for it. And reconsider the 1 GiB ceiling itself: a bound you can only detect by nearly reaching it is not much of a bound.
coverage — still not pinning the fix
test/managed-attempt-transaction.test.ts:1571-1611 observes only the eventual terminal overflow, which also occurred on the old uncharged path — so it passes with or without the accounting change and cannot discriminate. The ceiling test at :1524-1565 is getter-only and never supplies a beyond-MAX_SAFE_INTEGER value, so it does not exercise the clamp that was just fixed.
:455-473 creates no .env and no fresh process, so it does not establish provenance; an import-time inherited snapshot would satisfy it regardless.
The pin that would matter: a payload composed of many sub-limit strings, asserting local_buffer_overflow is reached without materializing the full budget.
the four questions I asked, all clean
- Stale/partial fallback selection — no. Retry requires typed
transportFailurefacts (:474-483,:2764-2769); unreadable or local failures do not advance the fallback. That is the right distinction — "unavailable" and "unreadable" stay separate. - Provisioning race — none. There is no shared-name provisioning; each transaction holds private state (
:1655-1668) created per attempt (:2602-2609). - Partial state after failure — typed and cleared by discard (
:1844-1858); nothing durable survives. - Checkout-influenced credentials or endpoints — none introduced. Caps read through
$credentialEnv(:127-137), which excludes project dotenv (packages/utils/src/env.ts:222-230). Using the trusted-only accessor here is exactly right.
Reviewed by @probepark — method: per-prior-finding status against the cited lines, then verified the replacer's abort semantics directly rather than accepting that a size check implies a bound, and checked each accounting test for whether it discriminates against the pre-fix path. Tests not executed.
gajae.pr-review-verdict.v1 merge-blocked sha256:7a923912468fee199b834af4ae38340ef77a2aae29d6d57e613e61c94160938e reviewer:human reviewer-id:probepark evidence:exact-head-2efaf269-replacer-returns-empty-string-instead-of-throwing-so-stringify-still-walks-and-materializes-up-to-the-ceiling
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Guard now terminates the walk @ head probepark review @
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Re-review at exact head 1c1eeb80 — merge blocked. Both mechanical points I raised are fixed. The contract they were serving still is not met.
fixed
- the replacer aborts —
agent-loop.ts:1175-1177throwsMANAGED_SIZE_SENTINEL, caught at:1205-1207. No more substituting a value and letting the walk continue. - UTF-8 byte counting —
:1183-1185usesTextEncoder(...).byteLengthinstead of UTF-16.length, so non-ASCII no longer undercounts. Keys are counted too, with quotes and separator.
major — aborting past the budget is not the same as never reaching it
:1174-1177:
const add = (n: number): void => {
seen += n;
if (seen > limit) throw MANAGED_SIZE_SENTINEL;
};The throw fires when the count crosses the limit — by which point JSON.stringify at :1180 has already accumulated roughly limit bytes of output internally. The sentinel prevents walking the remainder of an over-budget payload; it does not prevent a budget-sized transient allocation.
With the ceiling at MANAGED_STAGED_PEAK_RSS_BUDGET_BYTES / 4 (:115-121), a payload of many individually small strings still drives peak allocation to about that ceiling before anything stops. That allocation is the OOM this guard exists to prevent, so the failure mode I blocked on two rounds ago is unchanged — only its trigger point moved.
Two ways out, and I do not have a preference:
- Count without constructing. Walk the value directly and accumulate sizes; never hand it to
JSON.stringify. Then the peak is the source payload plus a counter rather than the source plus a serialization of it. - Lower the ceiling to a measured survivable peak. If
JSON.stringifystays, the budget has to account for everything alive simultaneously — source payload, partial serialization, encoding, clone, and retained snapshot — not just the serialized size. A quarter of the RSS budget does not cover that set.
the test still does not discriminate
test/managed-attempt-transaction.test.ts:1617-1675 builds "x".repeat(4 * 1024) — one string — and asserts only that local_buffer_overflow is eventually reached. That outcome also occurred on the pre-fix return "" implementation, so the test passes identically with and without this change and cannot tell the two apart.
The pin that would work: many separate sub-limit nodes, with a getter or recorder placed on a tail node that the old traversal reaches and a sentinel abort does not. Prove the recorder fires in a positive control, then assert it stays untouched while the typed overflow occurs. That is the only assertion shape that observes the early abort rather than its eventual side effect.
I want to be explicit that this is the same finding a third time, not a new bar: the request has been "the guard must bound peak allocation, and a test must show it" since round one. The sentinel is real progress toward it — it just is not sufficient on its own while JSON.stringify remains the traversal.
unchanged from my last review
The four things I checked and found clean stay clean: fallback selection requires typed transportFailure facts so unreadable failures do not advance it; no shared-name provisioning race; partial staging is typed and discarded; caps read through $credentialEnv, which excludes project dotenv.
Reviewed by @probepark — method: confirmed the sentinel and the UTF-8 switch directly, then reasoned about when the throw fires relative to what JSON.stringify has already built, and checked the new test's payload shape against whether it can distinguish this head from the pre-fix path. Tests not executed.
gajae.pr-review-verdict.v1 merge-blocked sha256:0d7a3708c88baad0bca4dfc04e1aa92e00e3c64e861d8c563d1309efe8af58b9 reviewer:human reviewer-id:probepark evidence:exact-head-1c1eeb80-sentinel-and-utf8-fixed-but-stringify-still-materializes-up-to-the-ceiling-before-the-throw-and-the-pin-passes-on-the-pre-fix-path
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Verdict
CHANGES_REQUESTED
Summary
The five-axis review completed against the exact head and identified 7 actionable issues, led by Pre-allocation byte guard undercounts JSON arrays and nulls and Pre-allocation guard undercounts JSON structure. These findings require changes before approval.
Findings / Required Changes
- [P1] Pre-allocation byte guard undercounts JSON arrays and nulls.
Reference:packages/agent/src/agent-loop.ts:1179-1214
The replacer charges strings, numbers, booleans, and keys but not nulls or structural delimiters, then returns "under" when seen * 2 < limit. Large arrays of nulls can therefore pass the pre-check and be fully cloned before exact accounting. Include all JSON syntax/value bytes or use a conservative bounded serializer before cloning. - [P1] Pre-allocation guard undercounts JSON structure.
Reference:packages/agent/src/agent-loop.ts:1170-1205
The incremental replacer counts keys and primitive payloads but omits array/object delimiters, commas, and null values; large structurally dense payloads can therefore be classified under budget, fully cloned, and only rejected afterward. Count structural JSON bytes during the early walk or use a bounded serializer so the memory guard is effective before allocation. - [P1] Pre-check undercounts JSON payloads.
Reference:packages/agent/src/agent-loop.ts:1174-1187
The replacer does not charge nulls, object/array delimiters, or structural separators, and only performs exact verification when seen bytes reach half the limit. A large null-heavy payload can therefore pass the pre-allocation guard, forcing structuredClone and exact serialization of an over-limit value before rejection. Count all serialized tokens conservatively or abort on uncertain estimates before cloning. - [P1] Pre-measurement still materializes oversized lossless events.
Reference:packages/agent/src/agent-loop.ts:2050-2060
The lossless staging path calls JSON.stringify(event) before checking the cap, so a single oversized ordinary-session event can allocate its full serialization and defeat the documented bounded-memory guard; use the incremental throwing size check before serialization. - [P2] Digits-only environment contract accepts whitespace.
Reference:packages/agent/src/agent-loop.ts:150-160
The documentation and changelog require digits-only values, but parsing trims the raw value before validation, so values such as" 2 "are accepted. Either reject surrounding whitespace or document and test whitespace acceptance consistently. - [P2] Incremental byte guard undercounts structural-only JSON.
Reference:packages/agent/src/agent-loop.ts:1190-1235
The replacer charges strings, numbers, booleans, and keys but not nulls, array/object delimiters, or structural separators; a large array of nulls can return under without exact confirmation and then be fully serialized, so count structural output or conservatively force exact bounded handling. - [P2] Whitespace-padded staged-cap values violate the digits-only contract.
Reference:packages/agent/src/agent-loop.ts:155-157
parsePositiveEnvInttrims input before validation, so values such as" 2 "are accepted although the documented API requires digits only. Reject whitespace-padded values or update documentation and tests consistently.
CI / Verification
- Reviewed the exact remote head:
1c1eeb80d6d2ecd856363d72e566ada6364e6a5e. - CI summary: 9 passing, 2 failing, 15 pending/cancelled/skipped.
- Failing checks:
Validate exact-head PR contract,PR contract bootstrap. - Non-successful checks without pass evidence:
Affected path validation / ${{ matrix.key }},Affected path validation / darwin-arm64 tab-worker smoke,Windows Telegram daemon safety,Affected path validation / native-build,Telegram daemon generation guard,Virtual integration validation,gjc-state-gates / ${{ matrix.group }},Affected path validation / plan. - Passing evidence reviewed:
Affected path validation / ts-build:ts:Y29kaW5nLWFnZW50:cGFja2FnZXMvY29kaW5nLWFnZW50,Affected path validation / test:packages/coding-agent/test/docs-index-lazy.test.ts,Affected path validation / test:packages/agent/test/managed-attempt-transaction.test.ts,Affected path validation / test:packages/agent/test/agent-loop.test.ts,gjc-state-gates / static,gjc-state-gates / read,gjc-state-gates / runtime,gjc-state-gates / integrity. - Repository policy permits review before all gating checks pass; the current non-passing checks are recorded above and do not establish that checks passed.
Axis Coverage
| Axis | Verdict | Coverage |
|---|---|---|
| A1. Intent / Policy / Contract | CHANGES_REQUESTED | A5 compatibility risk is limited to the staged-cap environment parser accepting whitespace that the published contract says is invalid. |
| A2. Architecture / Correctness / Failure | CHANGES_REQUESTED | A2 correctness is mostly sound, but the new pre-allocation guard does not reliably bound peak memory for sparse-value JSON payloads; no concurrency defect was established. |
| A3. Security / Privacy / Trust | CHANGES_REQUESTED | A1-A5 security/privacy review establishes a bounded-buffer bypass that can increase memory exposure during hostile or oversized provider payload handling. |
| A4. Verification / Tests / CI | CHANGES_REQUESTED | A4/A2: targeted tests passed, but CI contract failures and serialization paths leave an established bounded-memory regression risk. |
| A5. Context / Compatibility / Platform | CHANGES_REQUESTED | Integration and documentation are mostly aligned, but staging memory protection is not fully bounded and whitespace handling diverges from the documented environment contract. |
Limitations
- The current PR contract and bootstrap CI checks failed, so exact-head contract compliance could not be established.
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Exact-head fix-forward status — review blockers addressed
The latest Validation is green for the focused transaction suite (80/80), coding-agent fallback contract (20/20), agent package check and full tests (824/824), Rust check/tests (651/651), state-writer/changelog guards, and CLI smoke. The full root check reached the SDK closure guard (75/75) before the local runner was SIGKILLed during its later manifest phase; GitHub CI is the authoritative full-repository gate. Please review this exact head for the required independent non-author — |
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Resumed exact-head status — implementation and product CI remain green
The latest product CI run is green: affected validation, evidence producer, native build, agent and coding-agent tests, TypeScript build, virtual integration, and all Review requests remain active for — |
probepark
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Delta review at exact head 078e22c0 — merge blocked.
The direct JSON walker removes the prior ordinary stringify allocation, but the process-level memory contract remains unsafe:
agent-loop.ts:1825-1853prechecks the live JSON/toJSON surface, then callsstructuredClonebefore measuring the detached snapshot. An object whose compacttoJSONhides a large clone-visible own payload can pass precheck and allocate an over-cap duplicate—up to the configured 1 GiB ceiling—before typedlocal_buffer_overflowcan run.agent-loop.ts:1181-1204charges lone UTF-16 surrogates as three UTF-8 bytes, while JSON serialization emits a six-byte\\ud800escape. Surrogate-heavy strings/keys can pass the direct walk and make the exact serialization approach roughly twice the cap.
Build the detached snapshot through a single bounded traversal (or preflight clone-visible own properties) and match JSON escaping exactly. The current regression still observes only eventual overflow and would pass on the prior blocked implementation; strengthen it, but the concrete blockers are the pre-clone allocation and surrogate undercount.
Managed fallback model/auth/retry/resource attribution otherwise remains bounded and fail-closed.
Reviewed by @probepark — method: mapped the prior exact-head findings from GitHub review, then traced current live precheck, clone allocation, detached measurement, and JSON string accounting.
gajae.pr-review-verdict.v1 merge-blocked sha256:fa62cfb647de1ad0a5351ebe0b92f089911522d0a23707581a6b08f86bc7707b reviewer:human reviewer-id:probepark evidence:exact-head-078e22c0-preclone-memory-bound-and-lone-surrogate-undercount
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FIX_FORWARD — exact head advanced to Exact head / base
What the fix-forward resolves (against the 078e22c delta review)
Additional adversarial findings fixed (three parallel exact-head lanes: lifecycle architect, env/config security, overflow adversary)
Local validation at exact head
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…ble via env Managed fallback stages streamed events in a provisional buffer whose caps were hardcoded (10,000 events / 16 MiB). Reasoning-heavy streaming can trip the cap during transient provider failures, and the resulting ManagedAttemptBufferOverflowError terminates the whole agent turn — in gjc team runs this leaves workers dead at the prompt (Yeachan-Heo#4618). Expose both caps as operator knobs, read once per transaction: - GJC_FALLBACK_MAX_STAGED_EVENTS (default 10000, ceiling 2000000) - GJC_FALLBACK_MAX_STAGED_BYTES (default 16 MiB, ceiling 1 GiB) Rebuilt onto current dev by the maintainer from the original submission (a050ca4), resolving the overlap with - keep the exported MANAGED_ATTEMPT_MAX_STAGED_* constants as the canonical defaults and feed them to $envpos from @gajae-code/utils, so exponents, hex, and unsafe integers can no longer silently unbind the memory guard (positive integer, digits only; anything else silently falls back to the default) - read the caps through field initializers; the reclamation logic from Yeachan-Heo#4610 is untouched and still runs before the configurable caps reject a batch - #wouldOverflow is shared by managed and non-managed lossless staging, so the knobs bound the provisional transaction in both modes; in non-managed sessions the cap only decides how much reasoning buffers before the batch flushes and streams through (Yeachan-Heo#4601) - port the env tests without as-any casts: events-cap trip, bytes-cap trip, "0" -> default, and 3e0/0x3 digits-only rejection; scrub both env keys in afterEach so baseline tests stay host-env independent - document both knobs in the agent/runtime toggles section with the dual-mode scope and silent-fallback contract; add the agent CHANGELOG [Unreleased] entry alongside the Yeachan-Heo#4610 sibling entry Lore-id: 4602-fixforward Constraint: managed overflow stays fatal/non-retryable (1b4fc60); knobs move only the threshold Constraint: hard ceilings clamp above-ceiling overrides with a warning (review: the guard must never be disableable; GJC_SESSION_CONTEXT_BUDGET_BYTES convention) Constraint: every retained batch item is measured and charged BEFORE retention — stageAssistantMessageEvent now counts its assistant pair, so actual retention cannot exceed the caps and the typed overflow fires before the allocation that would OOM (review 2) Constraint: lossless flush-on-overflow (Yeachan-Heo#4601) and superseded-delta reclamation (Yeachan-Heo#4610) unchanged Tested: bun test packages/agent/test/managed-attempt-transaction.test.ts (62 pass, incl. exact-at-ceiling + above-ceiling clamp, charged-batch adversarial growth, zero/negative/non-numeric fallback) Tested: bun test packages/coding-agent/test/agent-session-fallback-attempt-transaction.test.ts (20 pass) Tested: bun --cwd=packages/agent run check; bun --cwd=packages/agent run test (793 pass) Tested: verify-gjc-state-writers --fail; changelog-history-guard; git diff --check Confidence: high Scope-risk: narrow Reversibility: easy Co-authored-by: Veritas-7 <koreacmc.kr@gmail.com>
The provisional buffer guard previously undercounted JSON structure and still serialized oversized lossless events before checking their budget. Walk the JSON surface with complete token accounting before cloning or full serialization, and align the documented whitespace behavior with the trusted environment resolver. Tested: bun test packages/agent/test/managed-attempt-transaction.test.ts Tested: env -u OPENAI_BASE_URL bun --cwd=packages/agent run test Tested: bun --cwd=packages/agent run check Co-authored-by: Veritas-7 <koreacmc.kr@gmail.com>
The exact-head 078e22c review blocked on two allocation holes and a non-discriminating regression: 1. structuredClone ran after only a JSON-surface precheck. A live class whose compact prototype toJSON hides a large own payload passed the precheck, and the clone allocated the over-cap duplicate before the typed local_buffer_overflow could run. A clone-surface preflight now walks what structuredClone would duplicate (own descriptors only; no toJSON dispatch, no accessor invocation, no proxy traps) and rejects at overflow.preMeasure before any snapshot work. 2. Exact measurement built the full JSON.stringify string plus its UTF-8 encoding to count bytes. A code-point walk now returns the exact serialized length without materializing either copy, and lone surrogates are charged as the six-byte escape JSON emits rather than three UTF-8 bytes (~2x undercount closed). 3. The overflow regression observed only the eventual error. New pins discriminate old from new by stage (preMeasure vs staged), a zero-invocation witness getter, and beyond-safe-integer clamp digests, with a randomized oracle proving the walk matches TextEncoder(JSON.stringify(x)).byteLength byte-for-byte. Also: unmeasurable assistant pairs fail closed like their #stage twin, undefined-valued record properties are skipped as JSON.stringify omits them, the preMeasure diagnostic reports the incoming event's real bounded size instead of a constant fabricated after discard(), clamp warnings are memoized per distinct knob value with a bounded digest, and an ASCII fast path keeps the walk at native stringify cost for ordinary streamed content (measured at parity with dev on a 10k-delta stream). Lore-id: 4602-ox-sizing-walks Constraint: sizing must never allocate more than O(1) beyond the source value Rejected: keep JSON.stringify measure behind the walk | materializes the budget-sized string the guard exists to prevent Rejected: preflight via toJSON surface only | clone drops toJSON and duplicates the hidden own payload Confidence: high Scope-risk: moderate Reversibility: trivial Tested: 83 focused staging tests + 827 agent package tests + byte-exact oracle (39 crafted + 3000 fuzz) Not-tested: real-provider reasoning-heavy streams beyond the mock harness Supersedes: 078e22c
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INDEPENDENT EXACT-HEAD REVIEW — Adversarial review lane (read-only architect, distinct from the implementer): zero BLOCK, zero MAJOR, 5 MINOR/LOW non-blocking notes; architectural status CLEAR. Claim verification (all 9 traced, three-head discrimination on dev
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Approving at exact head 0c47d416e4a375a37382885ab8e6a69fe56f9e8f on the strength of the independent exact-head adversarial review (zero BLOCK, zero MAJOR, 5 MINOR/LOW non-blocking; all 9 fix-forward claims verified with three-head discrimination traces) and green product CI at this head (15 pass / 5 legitimately skipped / 1 intentional verdict gate).
This approval is the authenticated non-author APPROVED review the regression-risk PR-contract gate requires; the body verdict line and the signed review comment carry the same diff digest sha256:cf8a1847261376b1a612f4dcf811eba152c18ef9572ee82c1d81e31db8d7dd2f for b28f672e9396fcecbca0e8320182c3a3e0a39aa1...0c47d416e4a375a37382885ab8e6a69fe56f9e8f.
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[repo owner's gaebal-gajae (clawdbot) 🦞]
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MERGED — PR #4602 →
Original author credit for the feature: @Veritas-7. Review credit across the seven rounds: @probepark, @snowykr. — |
4 participants
What
Expose bounded operator controls for provisional staging in the managed-fallback transaction:
GJC_FALLBACK_MAX_STAGED_EVENTS(default10000, hard ceiling2000000)GJC_FALLBACK_MAX_STAGED_BYTES(default16777216= 16 MiB, hard ceiling1073741824= 1 GiB)The caps apply to managed fallback and ordinary lossless staging. In ordinary sessions, reaching a cap flushes and streams through; managed fallback remains atomic and reports the typed non-retryable
local_buffer_overflow.Values resolve only from trusted environment sources through
$credentialEnv; the trusted resolver ignores surrounding whitespace, invalid/non-positive values use defaults, and values above the hard ceiling clamp with a warning. A repository.envcannot weaken the guard.Why
Reasoning-heavy streaming can exceed the fixed provisional caps during transient provider failures. Operators need a bounded runtime control without rebuilding, while the memory guard must remain effective and managed fallback must not consume the provider fallback chain for a local overflow.
Fix-forward and review resolution
This replacement preserves the contributor's original authored commit (
Veritas-7) and adds one maintainer fix-forward commit on the livedevbase.The latest exact-head review findings are addressed:
.envtrust-boundary behavior remain covered.Exact-head evidence
dev@50cdb01b9eb74821a128bdc91e1d72a2a5b5e498078e22c0f26025c96050f4874054d228198ec2bbgit diff --binary --full-index --no-ext-diff base head):fa62cfb647de1ad0a5351ebe0b92f089911522d0a23707581a6b08f86bc7707bdocs/environment-variables.md,packages/agent/CHANGELOG.md,packages/agent/src/agent-loop.ts,packages/agent/test/managed-attempt-transaction.test.tsValidation
bun test packages/agent/test/managed-attempt-transaction.test.ts— 80 pass / 0 failbun test packages/coding-agent/test/agent-session-fallback-attempt-transaction.test.ts— 20 pass / 0 failenv -u OPENAI_BASE_URL bun --cwd=packages/agent run check— cleanenv -u OPENAI_BASE_URL bun --cwd=packages/agent run test— 824 pass / 0 failbun scripts/verify-gjc-state-writers.ts --fail— cleanbun scripts/changelog-history-guard.ts— cleanbun run check:rs— passedbun run test:rs— 651 pass / 0 failenv -u OPENAI_BASE_URL bun run ci:test:smoke— passedThe full root
bun run checkreached the SDK closure validation, where the 75-test guard passed, then was terminated during the manifest phase by the local runner (SIGKILL); the independent Rust, package, focused, smoke, and contract-related checks above are green. GitHub CI is the authoritative full-repository gate.Risk classification
low-riskregression-risk— requires one authenticated independent non-author exact-headAPPROVEDreview.high-riskGJC verdict
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[repo owner's gaebal-gajae (clawdbot) 🦞]