[world-vercel] Fix 500s on queue callbacks for already-claimed messages

[pranaygp]

Closes #4269.

When VQS delivers a callback for a message that another consumer already holds (409, MessageNotAvailableError) or has already finished (410, MessageAlreadyProcessedError), @vercel/queue@0.5.1's handleCallback logs Queue callback error and responds 500 from /.well-known/workflow/v1/flow / /step. These are expected under concurrent/duplicate delivery, and the run is unaffected, but the 500s trip error alerts.

@vercel/queue@0.6.0 treats both as skipped deliveries and responds 200 ({ status: 'skipped', reason }, logged at debug). This PR bumps the catalog to 0.6.0 (the only other change in 0.6.0 is an opt-in cursorFallback option for polling receives, unused here) and adds queue-callback-skip.test.ts, which drives the real @vercel/queue callback path through createQueueHandler with a stubbed 409/410 claim response.

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: c8280bc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
@workflow/world-vercel	Patch
@workflow/cli	Patch
@workflow/core	Patch
@workflow/web	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/builders	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/vitest	Patch
@workflow/web-shared	Patch
@workflow/astro	Patch
@workflow/nest	Patch
@workflow/rollup	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch
@workflow/nuxt	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
example-nextjs-workflow-turbopack	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
example-nextjs-workflow-webpack	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
example-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-astro-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-express-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-fastify-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-hono-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-nestjs-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-nitro-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-nuxt-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-python-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-sveltekit-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-tanstack-start-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workbench-vite-workflow	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workflow-docs	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workflow-swc-playground	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workflow-tarballs	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC
workflow-web	Ready	Preview, v0	Oct 2, 2026 5:45pm UTC

[github-actions]

📊 Workflow Benchmarks

commit c8280bc · Fri, 02 Oct 2026 18:11:31 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	2234 (+514%) 🔻	2393 🔴 (+35%) 🔻	2435 🔴 (+35%) 🔻	2494 🔴 (+9.5%)	30
TTFS	stream	536 (-67%) 💚	2371 🔴 (+38%) 🔻	2436 🔴 (+39%) 🔻	2541 🔴 (+30%) 🔻	30
TTFS	hook + stream	2510 (+344%) 🔻	2635 🔴 (+28%) 🔻	2718 🔴 (+29%) 🔻	2849 🔴 (+15%)	30
Fan-out TTFS	Promise.all(100 steps)	522 (-1.7%)	727 (+27%) 🔻	744 (+30%) 🔻	2775 (+40%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	1635 (-10%)	3414 (+35%) 🔻	5580 (+110%) 🔻	14659 (+87%) 🔻	10
STSO	1020 steps (inline)	154 (+6.9%)	197 (+1.5%)	225 (±0%)	423 (+13%)	1019
WO	1020 steps	198663 (+4.2%)	198663 (+4.2%)	198663 (+4.2%)	198663 (+4.2%)	1
CRTT	first chunk (pooled)	70 (+21%) 🔻	108 (+6.9%)	165 (+49%) 🔻	4262 (+595%) 🔻	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	83 (+9%)	175 (+7%)	231 (-18%)	4246 (+502%)	154 (-6%)	10
size sweep (100/s, 160B-12KB)	98.5 (+18%)	179 (+8%)	3891 (+838%)	4196 (+652%)	174 (+3%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	141 (+68%)	143 (+4%)	181 (+8%)	385 (+29%)	172 (-28%)	3
replay eve-gpt-5.6-sol-2000t (1x)	94 (+4%)	156 (-11%)	204 (-10%)	480 (+15%)	375 (+17%)	2
replay eve-gpt-5.6-sol-2000t (2x)	72 (-15%)	3093 (+1494%)	4416 (+1444%)	6235 (+1009%)	405 (+42%)	3

📈 STSO distribution vs main (inline / queue-hop histograms)

1020 steps (inline)

Cumulative STSO time: main 190246ms → this run 198275ms (Δ +8029ms, +4%)

100-150 ms  ┃                         main   7  this   0    -7
150-200 ms  ██████████████████████┃█  main 802  this 785   -17
200-250 ms  ████┃                     main 149  this 169   +20
250-300 ms  ┃                         main  36  this  27    -9
300-350 ms  ┃                         main  11  this  19    +8
350-400 ms  ┃                         main   9  this   7    -2
400-450 ms  ┃                         main   3  this   4    +1
450-500 ms  ┃                         main   1  this   2    +1
500-550 ms  ┃                         main   0  this   4    +4
550-600 ms  ┃                         main   0  this   1    +1
700-750 ms  ┃                         main   1  this   0    -1
850-900 ms  ┃                         main   0  this   1    +1

📈 CRTT drill-down vs main (RTT distributions & profiles)

variant  RTT 1ms→5s+              avg         p50            p90            p99     n
control  ······▃█▁·▁▁·  401.8 (+208%)  130 (+20%)     231 (-18%)   4246 (+502%)  3000
sweep    ······▃█▁▁▁▂·  448.4 (+206%)   124 (+5%)   3891 (+838%)   4196 (+652%)  3000
gw 1x    ······▄█▁····   125.2 (+13%)  119 (+20%)      181 (+8%)     385 (+29%)  5295
eve 1x   ·····▁▃█▁▁···    135.7 (+3%)  123 (+14%)     204 (-10%)     480 (+15%)  5186
eve 2x   ·····▁▃█▂▁▁▂▁  655.4 (+326%)   142 (+6%)  4416 (+1444%)  6235 (+1009%)  7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):

control  █▇▆▆▅▅▄▂▂▁  265–535ms
sweep    ▅▄▄▃▂▂▁▁▂█  331–704ms
gw 1x    ▄▂▂▇▁█▅▄▃▃  115–139ms
eve 1x   ▆▂▁█▂█▆▅▃▁  118–156ms
eve 2x   ▁▁▁▂██▆▄▂▁  131–1611ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):

sweep  ▂▄▄▁█▇▁  445–454ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):

control  ▂▂▄▄▃█▂▂▁▄  39–55ms
sweep    ▁▁▂▂▁▁▁▁█▂  47–191ms
gw 1x    ▂▂▁▂▁█▅▃▂▂  35–44ms
eve 1x   ▇▄▁▇▃█▃▂▂▄  23–31ms
eve 2x   ▂▃▁██▂▃▂▁▃  23–54ms

📜 Previous results (2)

0a75781

Wed, 23 Sep 2026 20:59:11 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	2152 (+125%) 🔻	2253 🔴 (+72%) 🔻	2308 🔴 (+71%) 🔻	2641 🔴 (+77%) 🔻	30
TTFS	stream	256 (+50%) 🔻	2227 🔴 (+29%) 🔻	2293 🔴 (+31%) 🔻	2340 🔴 (+25%) 🔻	30
TTFS	hook + stream	690 (+53%) 🔻	2692 🔴 (+28%) 🔻	2814 🔴 (+29%) 🔻	7233 🔴 (+200%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	597 (+20%) 🔻	1487 (+113%) 🔻	2832 (+302%) 🔻	2881 (+55%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	2659 (+69%) 🔻	3958 (-14%)	5378 (-25%) 💚	11320 (-36%) 💚	10
STSO	1020 steps (inline)	132 (+23%) 🔻	165 (+7.1%)	181 (+3.4%)	278 (-24%) 💚	1019
WO	1020 steps	166607 (+8.7%)	166607 (+8.7%)	166607 (+8.7%)	166607 (+8.7%)	1
CRTT	first chunk (pooled)	71 (+6.0%)	117 (-4.1%)	396 (+181%) 🔻	4506 (+2631%) 🔻	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	99.5 (-12%)	306 (+23%)	487 (+52%)	3943 (+545%)	266 (+13%)	10
size sweep (100/s, 160B-12KB)	105 (+6%)	191 (-53%)	265 (-68%)	4459 (+140%)	147 (-54%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	106 (-15%)	183 (-20%)	234 (-28%)	472 (-54%)	256 (-58%)	3
replay eve-gpt-5.6-sol-2000t (1x)	259 (+180%)	169 (-31%)	226 (-45%)	530 (-27%)	424 (-14%)	2
replay eve-gpt-5.6-sol-2000t (2x)	88 (-12%)	263 (-29%)	428 (-21%)	715 (-22%)	356 (-34%)	3

eb4e906

Wed, 23 Sep 2026 19:46:27 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	1890 (+804%) 🔻	2698 🔴 (+160%) 🔻	2795 🔴 (+65%) 🔻	3814 🔴 (+119%) 🔻	30
TTFS	stream	162 (-21%) 💚	2021 🔴 (+19%) 🔻	2687 🔴 (+55%) 🔻	2883 🔴 (+43%) 🔻	30
TTFS	hook + stream	894 (+73%) 🔻	2886 🔴 (+38%) 🔻	3132 🔴 (+49%) 🔻	3580 🔴 (+64%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	506 (-9.0%)	776 (-67%) 💚	2971 (+12%)	3152 (+16%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	2517 (+53%) 🔻	3882 (-30%) 💚	4812 (-50%) 💚	7313 (-25%) 💚	10
STSO	1020 steps (inline)	120 (-4.8%)	152 (-4.4%)	164 (-7.3%)	240 (-21%) 💚	1019
WO	1020 steps	148623 (-6.5%)	148623 (-6.5%)	148623 (-6.5%)	148623 (-6.5%)	1
CRTT	first chunk (pooled)	63 (-22%) 💚	139 (+12%)	182 (+20%) 🔻	306 (+34%) 🔻	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	121 (+13%)	171 (-51%)	391 (-16%)	616 (-23%)	159 (-47%)	10
size sweep (100/s, 160B-12KB)	92 (-18%)	499 (+90%)	878 (+74%)	1339 (+5%)	177 (-2%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	182 (+36%)	149 (-47%)	203 (-47%)	843 (-8%)	243 (-51%)	3
replay eve-gpt-5.6-sol-2000t (1x)	131 (+21%)	162 (-67%)	215 (-68%)	338 (-65%)	287 (-43%)	2
replay eve-gpt-5.6-sol-2000t (2x)	107 (+10%)	275 (-57%)	355 (-64%)	510 (-68%)	308 (-60%)	3

ℹ️ Metric definitions & methodology

_{Streams: first-chunk RTT (the stream-open path, before any buffering/backpressure), CRTT percentiles, and worst delivery stall (CDV max). Cells are medians across iterations; per-run values in the artifacts. No 🔴/🟢 marks until targets attach.}

_{The collapsed STSO distribution section above buckets every step gap, split inline (same warm process — pure framework overhead) vs queue-hop (fresh process — dispatch, reinit, replay). █ = main, ┃ = this run, ░ = fill.}

_{The collapsed CRTT drill-down: per-variant RTT histograms (fixed log bins, · = empty) and mean RTT/positive-CDV profile lines over stream progress and chunk size. Histograms, avgs, and profiles merge exactly across runs; p50–p99 are percentile-of-percentiles. Per-index rows live in the artifacts.}

_{Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.}

_{Metrics — TTFS: time to first step body (in-deployment start() → first step body) · Fan-out TTFS: fan-out time to first step (in-deployment start() → first of the parallel step bodies to complete) · Fan-out TTLS: fan-out time to last step (in-deployment start() → last of the parallel step bodies to complete, i.e. when the Promise.all resolves) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · CRTT: chunk round-trip time (per-chunk write → read latency, one clock domain: deployment → stream backend → same deployment) · CDV: chunk delay variation / delivery jitter (inter-arrival gap minus inter-write gap per seq-adjacent pair; skew-free; the row is each run's MAX positive value, so one stall moves it)}

_{Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · Promise.all(100 steps): 100 trivial no-op steps started together in a single Promise.all; Fan-out TTFS is the first of them to complete and Fan-out TTLS the last, both from the in-deployment clientStart, so their gap is the spread the runtime adds across the fan-out · paced control (100/s, 60B): the control: 300 tiny (~60B) deltas metronome-paced at 100/s — zero workload structure, so it reads the transport floor and flush cadence, and disambiguates transport-wide vs workload-specific when a replay row moves · size sweep (100/s, 160B-12KB): same pacing as the control with deltas padded in rotation across seven log-spaced sizes (~160B–12KB) — rotation decouples size from stream position, so it isolates whether chunk size causes latency · replay gateway-gpt-5.4-nano-2000t (1x): raw provider SSE cadence captured at the AI gateway boundary (gpt-5.4-nano, the most popular gateway model; per-token deltas p50 208B = the modal production chunk size), replayed exactly as measured — the typical customer's workload; its CDV is the typical customer's real delivery jitter · replay eve-gpt-5.6-sol-2000t (1x): a captured eve turn (gpt-5.6-sol, the most-used demanding eve model; ~2000 output tokens = production p50 turn length) replayed exactly as measured — eve's envelope protocol re-ships the cumulative message so sizes ramp 142B→13KB; the demanding outlier tenant's reality · replay eve-gpt-5.6-sol-2000t (2x): the same eve capture at 2x — the headroom/stress row; real fast-tier models emit the same chunk sizes at proportionally higher rate, so time compression is a faithful speed model · first chunk (pooled): every run's seq-0 RTT pooled across all stream scenarios — the first chunk precedes any workload differentiation, so pooling samples one shared stream-open path with exact percentiles}

_{Replay cadences (semantic sha256) — eve-gpt-5.6-sol-2000t eaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t 6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041}

_{🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600}

_{All timestamps are deployment-side; runs are triggered in-deployment, so the CI runner and api.vercel.com sit outside every measured window. TTFS = start() → first step body (includes dispatch + any cold start); Fan-out TTFS/TTLS = first/last step completion of one Promise.all from the same anchor (the gap is the runtime’s fan-out spread); STSO/WO between step bodies; CRTT inside the workflow (excludes the api.vercel.com read path).}

_{Cold starts stay in the numbers (real bursty-workload latency, inflates P75+); Best is the warm floor.}

[github-actions]

🧪 E2E Test Results

✅ All tests passed

⚠️ Flaky E2E Tests (passed on retry)

These tests failed at least once and passed on a retry. A recurring entry here is a real race worth investigating.

• a run can take over its own earlier hook (nitro · local-prod / local / node / stable)
• health check (CLI) - workflow health command reports healthy endpoints (nextjs-webpack · local-dev / local / node / stable)

🛠 Infra Events (absorbed by the harness)

Platform anomalies the e2e harness detected and worked around (e.g. a run the queue never picked up, replaced by a fresh run). Clustered timestamps indicate a backend blip; a steady drip indicates a platform issue worth escalating.

• run-pickup-stall · runs app-generated source against a registered step (tanstack-start) · at 17:48:16Z · abandoned wrun_01M3YVNVF948WF6TXW89GP1XV0
• cold-start-warmup · suite warmup (tanstack-start) · at 17:48:23Z · abandoned wrun_01M3YVNVFJC5AKXTYKRFBJVCGK
• run-pickup-stall · workflow throw of a non-Error value round-trips verbatim as cause (nuxt) · at 17:49:33Z · abandoned wrun_01M3YVR72M6EDG8AZHFFTFYND3
• run-pickup-stall · hookCleanupTestWorkflow - hook token reuse after workflow completion (nextjs-webpack) · at 17:55:24Z · abandoned wrun_01M3YW2XPAXR4YJJXPCDGRHNNW
• run-pickup-stall · hookGetConflictWorkflow - awaiting hook.getConflict() registers hook without payload (nextjs-webpack) · at 17:55:33Z · abandoned wrun_01M3YW3661CF2J9C0VMYAF3BE6
• run-pickup-stall · 'hookGetConflictWithPriorStepWorkflow' - hook.getConflict() does not block step execution (nextjs-webpack) · at 17:55:34Z · abandoned wrun_01M3YW36VVT1PSZEVEHXFQ6XN1
• run-pickup-stall · thisSerializationWorkflow - step function invoked with .call() and .apply() (nextjs-webpack) · at 17:56:52Z · abandoned wrun_01M3YW5KBH4VMN8FESBBF86BEK

E2E Test Summary

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	3904	0	875	4779
✅ 💻 Local Development	4582	0	551	5133
✅ 📦 Local Production	4582	0	551	5133
✅ 🐘 Local Postgres	4582	0	551	5133
✅ 🪟 Windows	342	0	12	354
✅ 🌐 Cross-language Conformance	68	0	84	152
✅ dynamic-runs	0	0	0	0
✅ vercel-http-transport	879	0	183	1062
✅ vercel-multi-region	27	0	0	27
✅ vercel-ws-transport	595	0	113	708
Total	19561	0	2920	22481

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro-node	142	0	35
✅ astro-quickjs	142	0	35
✅ example-node	142	0	35
✅ example-quickjs	142	0	35
✅ express-node	142	0	35
✅ express-quickjs	142	0	35
✅ fastify-node	142	0	35
✅ fastify-quickjs	142	0	35
✅ hono-node	142	0	35
✅ hono-quickjs	142	0	35
✅ nest-node	142	0	35
✅ nest-quickjs	142	0	35
✅ nextjs-turbopack-node	169	0	8
✅ nextjs-turbopack-quickjs	169	0	8
✅ nextjs-webpack-node	169	0	8
✅ nextjs-webpack-quickjs	169	0	8
✅ nitro-node	142	0	35
✅ nitro-quickjs	142	0	35
✅ nuxt-node	142	0	35
✅ nuxt-quickjs	142	0	35
✅ python-node	66	0	111
✅ sveltekit-node	161	0	16
✅ sveltekit-quickjs	161	0	16
✅ tanstack-start-node	142	0	35
✅ tanstack-start-quickjs	142	0	35
✅ vite-node	142	0	35
✅ vite-quickjs	142	0	35

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable-node	148	0	29
✅ astro-stable-quickjs	148	0	29
✅ express-stable-node	148	0	29
✅ express-stable-quickjs	148	0	29
✅ fastify-stable-node	148	0	29
✅ fastify-stable-quickjs	148	0	29
✅ hono-stable-node	148	0	29
✅ hono-stable-quickjs	148	0	29
✅ nest-stable-node	148	0	29
✅ nest-stable-quickjs	148	0	29
✅ nextjs-turbopack-canary-node	176	0	1
✅ nextjs-turbopack-canary-quickjs	176	0	1
✅ nextjs-turbopack-quickjs-snapshot	176	0	1
✅ nextjs-turbopack-stable-node	176	0	1
✅ nextjs-turbopack-stable-quickjs	176	0	1
✅ nextjs-webpack-canary-node	176	0	1
✅ nextjs-webpack-canary-quickjs	176	0	1
✅ nextjs-webpack-stable-node	176	0	1
✅ nextjs-webpack-stable-quickjs	176	0	1
✅ nitro-stable-node	148	0	29
✅ nitro-stable-quickjs	148	0	29
✅ nuxt-stable-node	148	0	29
✅ nuxt-stable-quickjs	148	0	29
✅ sveltekit-stable-node	167	0	10
✅ sveltekit-stable-quickjs	167	0	10
✅ tanstack-start-node	148	0	29
✅ tanstack-start-quickjs	148	0	29
✅ vite-stable-node	148	0	29
✅ vite-stable-quickjs	148	0	29

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable-node	148	0	29
✅ astro-stable-quickjs	148	0	29
✅ express-stable-node	148	0	29
✅ express-stable-quickjs	148	0	29
✅ fastify-stable-node	148	0	29
✅ fastify-stable-quickjs	148	0	29
✅ hono-stable-node	148	0	29
✅ hono-stable-quickjs	148	0	29
✅ nest-stable-node	148	0	29
✅ nest-stable-quickjs	148	0	29
✅ nextjs-turbopack-canary-node	176	0	1
✅ nextjs-turbopack-canary-quickjs	176	0	1
✅ nextjs-turbopack-quickjs-snapshot	176	0	1
✅ nextjs-turbopack-stable-node	176	0	1
✅ nextjs-turbopack-stable-quickjs	176	0	1
✅ nextjs-webpack-canary-node	176	0	1
✅ nextjs-webpack-canary-quickjs	176	0	1
✅ nextjs-webpack-stable-node	176	0	1
✅ nextjs-webpack-stable-quickjs	176	0	1
✅ nitro-stable-node	148	0	29
✅ nitro-stable-quickjs	148	0	29
✅ nuxt-stable-node	148	0	29
✅ nuxt-stable-quickjs	148	0	29
✅ sveltekit-stable-node	167	0	10
✅ sveltekit-stable-quickjs	167	0	10
✅ tanstack-start-node	148	0	29
✅ tanstack-start-quickjs	148	0	29
✅ vite-stable-node	148	0	29
✅ vite-stable-quickjs	148	0	29

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable-node	148	0	29
✅ astro-stable-quickjs	148	0	29
✅ express-stable-node	148	0	29
✅ express-stable-quickjs	148	0	29
✅ fastify-stable-node	148	0	29
✅ fastify-stable-quickjs	148	0	29
✅ hono-stable-node	148	0	29
✅ hono-stable-quickjs	148	0	29
✅ nest-stable-node	148	0	29
✅ nest-stable-quickjs	148	0	29
✅ nextjs-turbopack-canary-node	176	0	1
✅ nextjs-turbopack-canary-quickjs	176	0	1
✅ nextjs-turbopack-quickjs-snapshot	176	0	1
✅ nextjs-turbopack-stable-node	176	0	1
✅ nextjs-turbopack-stable-quickjs	176	0	1
✅ nextjs-webpack-canary-node	176	0	1
✅ nextjs-webpack-canary-quickjs	176	0	1
✅ nextjs-webpack-stable-node	176	0	1
✅ nextjs-webpack-stable-quickjs	176	0	1
✅ nitro-stable-node	148	0	29
✅ nitro-stable-quickjs	148	0	29
✅ nuxt-stable-node	148	0	29
✅ nuxt-stable-quickjs	148	0	29
✅ sveltekit-stable-node	167	0	10
✅ sveltekit-stable-quickjs	167	0	10
✅ tanstack-start-node	148	0	29
✅ tanstack-start-quickjs	148	0	29
✅ vite-stable-node	148	0	29
✅ vite-stable-quickjs	148	0	29

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack-node	171	0	6
✅ nextjs-turbopack-quickjs	171	0	6

✅ 🌐 Cross-language Conformance

App	Passed	Failed	Skipped
✅ python	68	0	84

✅ dynamic-runs

App	Passed	Failed	Skipped
✅ astro-vercel	0	0	0
✅ example-vercel	0	0	0
✅ express-vercel	0	0	0
✅ fastify-vercel	0	0	0
✅ hono-vercel	0	0	0
✅ nest-vercel	0	0	0
✅ nextjs-turbopack-vercel	0	0	0
✅ nextjs-webpack-vercel	0	0	0
✅ nitro-vercel	0	0	0
✅ nuxt-vercel	0	0	0
✅ sveltekit-vercel	0	0	0
✅ tanstack-start-vercel	0	0	0
✅ vite-vercel	0	0	0

✅ vercel-http-transport

App	Passed	Failed	Skipped
✅ example	142	0	35
✅ express	142	0	35
✅ hono	142	0	35
✅ nextjs-turbopack	169	0	8
✅ nitro	142	0	35
✅ vite	142	0	35

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

✅ vercel-ws-transport

App	Passed	Failed	Skipped
✅ example	142	0	35
✅ express	142	0	35
✅ nextjs-turbopack	169	0	8
✅ vite	142	0	35

---

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[github-actions]

Sim World

Simulated world deterministic testing for races. Traces

🟠 world-sim scenario book — 1 fail of 42 total

fence=per-spec

scenario	outcome	events	virt	replay	violations
✅ smoke-no-steps	completed	3	0ms	ok	0
✅ smoke-one-step	completed	6	0ms	ok	0
✅ hook-at-step-started	completed	12	0ms	ok	0
✅ hook-at-step-completed	completed	12	0ms	ok	0
✅ hook-at-hook-created	completed	12	0ms	ok	0
✅ deadline-hook-wins	completed	7	1.0h	ok	0
✅ deadline-expires	completed	7	1.0h	ok	0
✅ step-vs-timer-early-settlement	completed	8	1.0h	ok	0
✅ long-sleep	completed	11	30.0d	ok	0
✅ hook-never-arrives	stalled	3	0ms	skipped	0
✅ step-retries-twice	completed	10	2.0s	ok	0
✅ parallel-steps	completed	9	0ms	ok	0
✅ hook-on-execution-state	completed	12	0ms	ok	0
✅ peek-hook-before-branch	completed	12	0ms	ok	0
✅ peek-hook-after-branch	completed	12	0ms	ok	0
✅ peek-hook-at-registration	completed	12	0ms	ok	0
✅ race-hook-before-probe	completed	12	0ms	ok	0
✅ race-hook-after-probe	completed	12	0ms	ok	0
✅ race-duplicate-delivery	completed	13	0ms	ok	0
✅ attr-hook-before-step	completed	11	0ms	ok	0
✅ attr-hook-after-step	completed	11	0ms	ok	0
✅ attr-from-step-body	completed	13	0ms	ok	0
✅ fork-hook-after-timeout	completed	14	1.0m	ok	0
✅ fork-hook-before-timeout	completed	14	1.0m	ok	0
✅ count-hook-after-timeout	completed	17	1.0m	ok	0
✅ count-hook-before-timeout	completed	20	1.0m	ok	0
✅ stale-read-step-count-fork	completed	20	1.0m	ok	0
✅ stale-read-equal-step-counts	completed	14	1.0m	ok	0
✅ step-vs-step-fork	completed	12	0ms	ok	0
✅ step-vs-step-fork-fenced	completed	12	0ms	ok	0
✅ fence-catches-benign-direction	completed	12	5ms	ok	0
✅ in-flight-before-decision	completed	17	1.0m	ok	0
❌ in-flight-before-decision-counted	completed	17	1.0m	ok	0
✅ in-flight-after-decision	completed	19	2.0m	ok	0
✅ stale-read-step-count-fork-fenced	completed	20	1.0m	ok	0
✅ fork-hook-wins	completed	13	1.0m	ok	0
✅ fork-timeout-wins	completed	13	1.0m	ok	0
✅ unclaimed-payload-under-fork	completed	17	1.0m	ok	0
✅ claimed-payload-under-fork	completed	17	1.0m	ok	0
✅ writers-independent-step-bodies	completed	12	0ms	ok	0
✅ writers-scripted-tempo	completed	12	0ms	ok	0
✅ cancel-mid-step	cancelled	7	0ms	skipped	0

Full trace: world-sim.txt

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​vercel/​queue@​0.5.1 ⏵ 0.6.0			+1

View full report

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused dependency update is lockfile-consistent and directly covered by realistic regression tests.

Review effort: Balanced
Findings: None

What changed in this PR

Updates @workflow/world-vercel to treat duplicate or concurrently claimed queue callbacks as successful skips instead of 500 errors.

Changes:

• Upgrades @vercel/queue to 0.6.0.
• Adds regression coverage for 409 and 410 callback claims.
• Adds a patch changeset.

File	Description
pnpm-workspace.yaml	Updates the queue dependency catalog.
pnpm-lock.yaml	Refreshes resolved dependencies.
packages/​world-vercel/​src/​queue-callback-skip.test.ts	Tests skipped callback behavior.
.changeset/​queue-skip-unclaimable-callbacks.md	Documents the patch release.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

---

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[github-actions]

No backport to stable for a6c455a (AI decision).

The fix itself is entirely a dependency bump: all behavior comes from @vercel/queue 0.6.0 treating 409/410 callback claims as skipped, with the repo-side change being only the catalog pin plus a regression test. stable pins @vercel/queue at 0.3.1, so backporting means pulling in three minors of unrelated upstream change into a maintenance line, and the defect being fixed is spurious 500 responses / alert noise on deliveries that the PR itself says leave the run unaffected — not a correctness, data-loss, or hang problem. If the 500s are hurting stable users in practice, this is worth forcing through via workflow_dispatch after validating 0.6.0 against stable's older createQueueHandler path.

To override, re-run the Backport to stable workflow manually via workflow_dispatch and paste this commit SHA into the ref input:

a6c455a09c622e184f518764109fa455eb718699