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[core] Retain workflow VMs across waits - #3892

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[core] Retain workflow VMs across waits#3892
NathanColosimo wants to merge 2 commits into
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codex/retain-vm-with-waits

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@NathanColosimo

@NathanColosimo NathanColosimo commented Aug 28, 2026 •
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Summary

  • generation-guard sleep suspension signals like step, hook, and attribute signals
  • retain the live VM when a wait is open at a step- or attribute-driven suspension boundary
  • keep pure wait suspensions parked and keep the inline event-log delta disabled while waits are open
  • compare retained execution with cold replay for both an open losing sleep and a wait completion interleaved with an inline step

Why

An open wait previously forced every inline iteration back through VM creation and full replay even when a step or attribute write was already driving progress in the current invocation. The shared suspension-generation guard makes stale same-boundary sleep signals no-op, so the same monotone-prefix and step-ownership invariants used for retained hooks apply without changing the durable wait protocol or keeping a VM alive across invocations.

Verification

  • pnpm vitest run packages/core/src/retained-vm-loop.test.ts — 20 passed
  • pnpm --filter @workflow/core test — 2,295 passed, 3 expected failures, 1 skipped
  • pnpm turbo build --filter=@workflow/core... — 7 tasks passed
  • focused Biome check — no new diagnostics
  • autoreview panel — clean, no actionable P0-P2 findings

Docs Preview

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Runtime tuning Retained VM behavior
What is new in v5 Faster and cheaper runs

@NathanColosimo
NathanColosimo requested a review from a team as a code owner August 28, 2026 22:26
@changeset-bot

changeset-bot Bot commented Aug 28, 2026 •
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🦋 Changeset detected

Latest commit: b9acbb3

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

This PR includes changesets to release 16 packages
Name Type
@workflow/core Patch
@workflow/builders Patch
@workflow/cli Patch
@workflow/next Patch
@workflow/nitro Patch
@workflow/vitest Patch
@workflow/web-shared Patch
@workflow/web Patch
workflow Patch
@workflow/world-testing 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

vercel Bot commented Aug 28, 2026 •
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The latest updates on your projects. Learn more about Vercel for GitHub.

Project Deployment Actions Updated (UTC)
example-nextjs-workflow-turbopack Ready Ready Preview, v0 Aug 28, 2026 11:24pm
example-nextjs-workflow-webpack Ready Ready Preview, v0 Aug 28, 2026 11:24pm
example-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-astro-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-express-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-fastify-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-hono-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-nestjs-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-nitro-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-nuxt-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-python-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-sveltekit-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-tanstack-start-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workbench-vite-workflow Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workflow-docs Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workflow-swc-playground Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workflow-tarballs Ready Ready Preview, v0 Aug 28, 2026 11:24pm
workflow-web Ready Ready Preview, v0 Aug 28, 2026 11:24pm

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📊 Workflow Benchmarks

commit b9acbb3 · Fri, 28 Aug 2026 23:38:12 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric Scenario Best (ms) P75 (ms) P90 (ms) P99 (ms) Samples
TTFS step 354 (-48%) 💚 1358 🔴 (+20%) 🔻 1387 🔴 (+22%) 🔻 1402 🔴 (+22%) 🔻 30
TTFS stream 236 (+3.1%) 1346 🔴 (+25%) 🔻 1357 🔴 (+23%) 🔻 1384 🔴 (+18%) 🔻 30
TTFS hook + stream 512 (+4.5%) 1640 🔴 (+22%) 🔻 1704 🔴 (+23%) 🔻 1782 🔴 (+22%) 🔻 30
Fan-out TTFS Promise.all(100 steps) 468 (-17%) 💚 799 (-53%) 💚 802 (-56%) 💚 1992 (+1.4%) 10
Fan-out TTLS Promise.all(100 steps) 1738 (-21%) 💚 2600 (-30%) 💚 2669 (-29%) 💚 8820 (+12%) 10
STSO 1020 steps (inline) 111 (-1.8%) 134 (-4.3%) 157 (-2.5%) 238 (+21%) 🔻 1019
WO 1020 steps 137687 (-2.2%) 137687 (-2.2%) 137687 (-2.2%) 137687 (-2.2%) 1
CRTT first chunk (pooled) 78 (-32%) 💚 118 (-50%) 💚 161 (-68%) 💚 240 (-64%) 💚 28

Streams

Scenario CRTT 1st p75 p90 p99 CDV max iters
paced control (100/s, 60B) 103 (-29%) 120 (-76%) 182 (-74%) 358 (-64%) 94 (-79%) 10
size sweep (100/s, 160B-12KB) 103 (-42%) 129 (-45%) 244 (-57%) 528 (-41%) 109 (-54%) 10
replay gateway-gpt-5.4-nano-2000t (1x) 99 (-49%) 111 (-53%) 131 (-70%) 254 (-74%) 122 (-83%) 3
replay eve-gpt-5.6-sol-2000t (1x) 161 (-59%) 112 (-80%) 144 (-92%) 338 (-92%) 274 (-87%) 2
replay eve-gpt-5.6-sol-2000t (2x) 124 (-21%) 155 (-79%) 222 (-79%) 390 (-71%) 244 (-57%) 3
📈 STSO distribution vs main (inline / queue-hop histograms)

1020 steps (inline)

Cumulative STSO time: main 139837ms → this run 136382ms (Δ -3455ms, -2%)

100-150 ms  ███████████████████████┃  main 857  this 882   +25
150-200 ms  ██┃█                      main 152  this 122   -30
200-250 ms  ┃                         main   8  this   6    -2
250-300 ms  ┃                         main   0  this   6    +6
300-350 ms  ┃                         main   2  this   3    +1
📈 CRTT drill-down vs main (RTT distributions & profiles) 
variant  RTT 1ms→5s+             avg         p50         p90         p99     n
control  ·····▁█▇▁····  104.3 (-63%)   99 (-48%)  182 (-74%)  358 (-64%)  3000
sweep    ······██▁▁···  115.1 (-45%)  100 (-42%)  244 (-57%)  528 (-41%)  3000
gw 1x    ·····▁█▅▁····   94.8 (-54%)   93 (-43%)  131 (-70%)  254 (-74%)  5295
eve 1x   ·····▁█▅▁····     97 (-77%)   88 (-52%)  144 (-92%)  338 (-92%)  5186
eve 2x   ·····▁▅█▂····  125.5 (-67%)  114 (-54%)  222 (-79%)  390 (-71%)  7779

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

control  ▅▁▂█▂▁▆▃▁█  98–114ms
sweep    █▄▁▁▂▁▂▁▂▃  96–179ms
gw 1x    ▄▂▄▅▄▁▃█▃▃  90–103ms
eve 1x   ▇▁▃▆▂▃▅█▃▁  85–112ms
eve 2x   ▅▂▂▆▁▇▆█▆▅  107–141ms

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

sweep  ▆█▆▄▃▁▁  113–118ms

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

control  ▁▄▇▇▅██▇▆█  25–32ms
sweep    ▅▁▂▂█▃▆▃▃█  39–47ms
gw 1x    ▁▆▅▅█▇▅█▄▇  24–30ms
eve 1x   █▄▄▅▁▁▇▂▃▂  19–24ms
eve 2x   ▇█▁▂▂▅▄▂▆▇  19–24ms
📜 Previous results (1)

cc10ff1

Fri, 28 Aug 2026 22:51:54 GMT · run logs

vercel / nextjs-turbopack

Metric Scenario Best (ms) P75 (ms) P90 (ms) P99 (ms) Samples
TTFS step 1249 (+84%) 🔻 1323 🔴 (+17%) 🔻 1367 🔴 (+20%) 🔻 1692 🔴 (+47%) 🔻 30
TTFS stream 187 (-18%) 💚 1298 🔴 (+20%) 🔻 1328 🔴 (+21%) 🔻 1358 🔴 (+16%) 🔻 30
TTFS hook + stream 1345 (+174%) 🔻 1630 🔴 (+21%) 🔻 1733 🔴 (+25%) 🔻 6009 🔴 (+313%) 🔻 30
Fan-out TTFS Promise.all(100 steps) 506 (-10%) 990 (-42%) 💚 1976 (+8.8%) 2025 (+3.1%) 10
Fan-out TTLS Promise.all(100 steps) 1955 (-11%) 3487 (-6.0%) 4674 (+24%) 🔻 8804 (+12%) 10
STSO 1020 steps (inline) 103 (-8.8%) 141 (+0.7%) 158 (-1.9%) 209 (+6.1%) 1019
WO 1020 steps 140338 (±0%) 140338 (±0%) 140338 (±0%) 140338 (±0%) 1
CRTT first chunk (pooled) 106 (-7.8%) 162 (-31%) 💚 271 (-47%) 💚 460 (-31%) 💚 28

Streams

Scenario CRTT 1st p75 p90 p99 CDV max iters
paced control (100/s, 60B) 140 (-2%) 180 (-64%) 314 (-55%) 490 (-50%) 145 (-68%) 10
size sweep (100/s, 160B-12KB) 136 (-24%) 161 (-31%) 196 (-65%) 421 (-53%) 124 (-47%) 10
replay gateway-gpt-5.4-nano-2000t (1x) 177 (-10%) 134 (-43%) 170 (-62%) 402 (-59%) 277 (-62%) 3
replay eve-gpt-5.6-sol-2000t (1x) 152 (-61%) 134 (-76%) 164 (-91%) 285 (-93%) 323 (-85%) 2
replay eve-gpt-5.6-sol-2000t (2x) 136 (-13%) 168 (-77%) 228 (-78%) 591 (-55%) 490 (-14%) 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.

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🧪 E2E Test Results

❌ Some tests failed

❌ Failed E2E Tests

▲ Vercel Production (8 failed)

python-node (8 failed):

  • promiseAllWorkflow | wrun_41M15B05WR0GKW0H4A7K8M4DF1 | 🔍 observability
  • sleepingWorkflow | wrun_41M15B0RK20GT6VCXMSDKECG2Z | 🔍 observability
  • parallelSleepWorkflow | wrun_41M15B0SG60GHBACBSNS2NS1AP | 🔍 observability
  • nullByteWorkflow | wrun_41M15B0ZYW0GJ3KM5VZ031BC9K | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M15B5G4W0GZGMY9W0F4208XS | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M15B5GTS0GP88P3DWZ683M0C | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M15B5SWS0GQVWXC9817JRRP8 | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M15B6BBD0GYVD7E83REEY02E | 🔍 observability

🌐 Cross-language Conformance (9 failed)

python (9 failed):

  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M15B7D9TNRM6X4KWBSN5SVEE
  • promiseAllWorkflow | wrun_41M15B05WR0GKW0H4A7K8M4DF1
  • sleepingWorkflow | wrun_41M15B0RK20GT6VCXMSDKECG2Z
  • parallelSleepWorkflow | wrun_41M15B0SG60GHBACBSNS2NS1AP
  • nullByteWorkflow | wrun_41M15B0ZYW0GJ3KM5VZ031BC9K
  • cancelRun - cancelling a running workflow | wrun_41M15B5G4W0GZGMY9W0F4208XS
  • cancelRun via CLI - cancelling a running workflow | wrun_41M15B5GTS0GP88P3DWZ683M0C
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M15B5SWS0GQVWXC9817JRRP8
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M15B6BBD0GYVD7E83REEY02E

⚠️ 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.

  • addTenWorkflow (nextjs-webpack)
  • hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-turbopack)
  • hookWorkflow (tanstack-start)
  • hookWorkflow (vite)

🛠 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.

32 infra events
  • cold-start-warmup · suite warmup (python) · at 23:24:20Z · abandoned wrun_41M15AWVYM0GQ5XP4M2W0TS5V9 · (+7 more)
  • run-pickup-stall · promiseAllWorkflow (python) · at 23:24:36Z · abandoned wrun_41M15B0GPD0GPP125EY8B6CY1N
  • run-pickup-stall · nullByteWorkflow (python) · at 23:24:36Z · abandoned wrun_41M15B0GPQ0GWKKEDAC1NM2XC8
  • run-pickup-stall · sleepingWorkflow (python) · at 23:24:36Z · abandoned wrun_41M15B0GPM0GXKXW0Y82BYBH15
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 23:24:36Z · abandoned wrun_41M15B0GZK0GS9Q65TE6DQHJAP
  • run-pickup-stall · parallelSleepWorkflow (python) · at 23:24:36Z · abandoned wrun_41M15B0GPM0GXKXW0Y82BYBH16
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 23:25:08Z · abandoned wrun_41M15B1FZD0GX3S7Q60ZXZXREM
  • run-pickup-stall · sleepingWorkflow (python) · at 23:25:37Z · abandoned wrun_41M15B2BXZ0GZQBYYHTZ1QJQFH
  • run-pickup-stall · promiseAllWorkflow (python) · at 23:25:37Z · abandoned wrun_41M15B2BY10GMRW7N291NDE43Y
  • run-pickup-stall · nullByteWorkflow (python) · at 23:25:37Z · abandoned wrun_41M15B2BZE0GTJKD3GDJMX76JB
  • run-pickup-stall · parallelSleepWorkflow (python) · at 23:25:37Z · abandoned wrun_41M15B2BY50GX3FNVN75EZC7M1
  • cold-start-warmup · suite warmup (tanstack-start) · at 23:25:40Z · abandoned wrun_01M15B23DE73NETFQGPCFYKYHF
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 23:26:17Z · abandoned wrun_41M15B2F3R0GJ9JN65G6FT7M9J
  • cold-start-warmup · suite warmup (python) · at 23:26:51Z · abandoned wrun_01M15B1EVSWHDS3DKQXJ9EQ17C · (+7 more)
  • run-pickup-stall · promiseAllWorkflow (python) · at 23:27:06Z · abandoned wrun_01M15B540JMVC9ZQNTMT6KQYGJ
  • run-pickup-stall · sleepingWorkflow (python) · at 23:27:06Z · abandoned wrun_01M15B540RXEYGSAQCSMZ038DE
  • run-pickup-stall · parallelSleepWorkflow (python) · at 23:27:06Z · abandoned wrun_01M15B540SYDSFRGMS45ZA92CA
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 23:27:06Z · abandoned wrun_01M15B540H65977YP82F6YRGPH
  • run-pickup-stall · nullByteWorkflow (python) · at 23:27:06Z · abandoned wrun_01M15B540VCSRV908XG901NT0W
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 23:28:06Z · abandoned wrun_01M15B6YMD5T5FFW97VCFAF3QS
  • run-pickup-stall · promiseAllWorkflow (python) · at 23:28:06Z · abandoned wrun_01M15B6YMFD092N5JJN76XCBD7
  • run-pickup-stall · sleepingWorkflow (python) · at 23:28:06Z · abandoned wrun_01M15B6YMJWJKBRN1566Z0RT8M
  • run-pickup-stall · nullByteWorkflow (python) · at 23:28:06Z · abandoned wrun_01M15B6YMPC0ZWQCBN4KD4D29J
  • run-pickup-stall · parallelSleepWorkflow (python) · at 23:28:06Z · abandoned wrun_01M15B6YMK1KQN4XGRHQAGJ9RP
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 23:28:08Z · abandoned wrun_41M15B57090GWV8DX0XQSJVFEN
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 23:28:08Z · abandoned wrun_41M15B53TK0GK9SXQEHY7SXB3Q
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 23:29:06Z · abandoned wrun_01M15B8S83Y0EP5H8A8R43R71M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 23:29:06Z · abandoned wrun_01M15B8S8GBSXMVFEWBD11KMSV
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 23:29:06Z · abandoned wrun_01M15B8S8CYKDWQ6DA7V9AQA3S
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 23:29:36Z · abandoned wrun_01M15B9PKJDWZ1C4TTYSXWF184
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 23:29:36Z · abandoned wrun_01M15B9PKQTBT5K9VDWS6JNH5S
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 23:30:06Z · abandoned wrun_01M15BAKVMSMS77D2AYBTKH4T3

E2E Test Summary

Summary
Passed Failed Skipped Total
❌ ▲ Vercel Production 3570 8 742 4320
✅ 💻 Local Development 3922 0 558 4480
✅ 📦 Local Production 3922 0 558 4480
✅ 🐘 Local Postgres 3922 0 558 4480
✅ 🪟 Windows 320 0 0 320
❌ 🌐 Cross-language Conformance 0 9 132 141
✅ vercel-http-transport 817 0 143 960
✅ vercel-multi-region 27 0 0 27
✅ vercel-ws-transport 553 0 87 640
Total 17053 17 2778 19848
Details by Category

❌ ▲ Vercel Production

App Passed Failed Skipped
✅ astro-node 132 0 28
✅ astro-quickjs 132 0 28
✅ example-node 132 0 28
✅ example-quickjs 132 0 28
✅ express-node 132 0 28
✅ express-quickjs 132 0 28
✅ fastify-node 132 0 28
✅ fastify-quickjs 132 0 28
✅ hono-node 132 0 28
✅ hono-quickjs 132 0 28
✅ nest-node 132 0 28
✅ nest-quickjs 132 0 28
✅ nextjs-turbopack-node 157 0 3
✅ nextjs-turbopack-quickjs 157 0 3
✅ nextjs-webpack-node 157 0 3
✅ nextjs-webpack-quickjs 157 0 3
✅ nitro-node 132 0 28
✅ nitro-quickjs 132 0 28
✅ nuxt-node 132 0 28
✅ nuxt-quickjs 132 0 28
❌ python-node 0 8 152
✅ sveltekit-node 151 0 9
✅ sveltekit-quickjs 151 0 9
✅ tanstack-start-node 132 0 28
✅ tanstack-start-quickjs 132 0 28
✅ vite-node 132 0 28
✅ vite-quickjs 132 0 28

✅ 💻 Local Development

App Passed Failed Skipped
✅ astro-stable-node 134 0 26
✅ astro-stable-quickjs 134 0 26
✅ express-stable-node 134 0 26
✅ express-stable-quickjs 134 0 26
✅ fastify-stable-node 134 0 26
✅ fastify-stable-quickjs 134 0 26
✅ hono-stable-node 134 0 26
✅ hono-stable-quickjs 134 0 26
✅ nest-stable-node 134 0 26
✅ nest-stable-quickjs 134 0 26
✅ nextjs-turbopack-canary-node 141 0 19
✅ nextjs-turbopack-canary-quickjs 141 0 19
✅ nextjs-turbopack-stable-node 160 0 0
✅ nextjs-turbopack-stable-quickjs 160 0 0
✅ nextjs-webpack-canary-node 141 0 19
✅ nextjs-webpack-canary-quickjs 141 0 19
✅ nextjs-webpack-stable-node 160 0 0
✅ nextjs-webpack-stable-quickjs 160 0 0
✅ nitro-stable-node 134 0 26
✅ nitro-stable-quickjs 134 0 26
✅ nuxt-stable-node 134 0 26
✅ nuxt-stable-quickjs 134 0 26
✅ sveltekit-stable-node 153 0 7
✅ sveltekit-stable-quickjs 153 0 7
✅ tanstack-start-node 134 0 26
✅ tanstack-start-quickjs 134 0 26
✅ vite-stable-node 134 0 26
✅ vite-stable-quickjs 134 0 26

✅ 📦 Local Production

App Passed Failed Skipped
✅ astro-stable-node 134 0 26
✅ astro-stable-quickjs 134 0 26
✅ express-stable-node 134 0 26
✅ express-stable-quickjs 134 0 26
✅ fastify-stable-node 134 0 26
✅ fastify-stable-quickjs 134 0 26
✅ hono-stable-node 134 0 26
✅ hono-stable-quickjs 134 0 26
✅ nest-stable-node 134 0 26
✅ nest-stable-quickjs 134 0 26
✅ nextjs-turbopack-canary-node 141 0 19
✅ nextjs-turbopack-canary-quickjs 141 0 19
✅ nextjs-turbopack-stable-node 160 0 0
✅ nextjs-turbopack-stable-quickjs 160 0 0
✅ nextjs-webpack-canary-node 141 0 19
✅ nextjs-webpack-canary-quickjs 141 0 19
✅ nextjs-webpack-stable-node 160 0 0
✅ nextjs-webpack-stable-quickjs 160 0 0
✅ nitro-stable-node 134 0 26
✅ nitro-stable-quickjs 134 0 26
✅ nuxt-stable-node 134 0 26
✅ nuxt-stable-quickjs 134 0 26
✅ sveltekit-stable-node 153 0 7
✅ sveltekit-stable-quickjs 153 0 7
✅ tanstack-start-node 134 0 26
✅ tanstack-start-quickjs 134 0 26
✅ vite-stable-node 134 0 26
✅ vite-stable-quickjs 134 0 26

✅ 🐘 Local Postgres

App Passed Failed Skipped
✅ astro-stable-node 134 0 26
✅ astro-stable-quickjs 134 0 26
✅ express-stable-node 134 0 26
✅ express-stable-quickjs 134 0 26
✅ fastify-stable-node 134 0 26
✅ fastify-stable-quickjs 134 0 26
✅ hono-stable-node 134 0 26
✅ hono-stable-quickjs 134 0 26
✅ nest-stable-node 134 0 26
✅ nest-stable-quickjs 134 0 26
✅ nextjs-turbopack-canary-node 141 0 19
✅ nextjs-turbopack-canary-quickjs 141 0 19
✅ nextjs-turbopack-stable-node 160 0 0
✅ nextjs-turbopack-stable-quickjs 160 0 0
✅ nextjs-webpack-canary-node 141 0 19
✅ nextjs-webpack-canary-quickjs 141 0 19
✅ nextjs-webpack-stable-node 160 0 0
✅ nextjs-webpack-stable-quickjs 160 0 0
✅ nitro-stable-node 134 0 26
✅ nitro-stable-quickjs 134 0 26
✅ nuxt-stable-node 134 0 26
✅ nuxt-stable-quickjs 134 0 26
✅ sveltekit-stable-node 153 0 7
✅ sveltekit-stable-quickjs 153 0 7
✅ tanstack-start-node 134 0 26
✅ tanstack-start-quickjs 134 0 26
✅ vite-stable-node 134 0 26
✅ vite-stable-quickjs 134 0 26

✅ 🪟 Windows

App Passed Failed Skipped
✅ nextjs-turbopack-node 160 0 0
✅ nextjs-turbopack-quickjs 160 0 0

❌ 🌐 Cross-language Conformance

App Passed Failed Skipped
❌ python 0 9 132

✅ vercel-http-transport

App Passed Failed Skipped
✅ example 132 0 28
✅ express 132 0 28
✅ hono 132 0 28
✅ nextjs-turbopack 157 0 3
✅ nitro 132 0 28
✅ vite 132 0 28

✅ vercel-multi-region

App Passed Failed Skipped
✅ nextjs-turbopack 27 0 0

✅ vercel-ws-transport

App Passed Failed Skipped
✅ example 132 0 28
✅ express 132 0 28
✅ nextjs-turbopack 157 0 3
✅ vite 132 0 28

📋 View full workflow run

@github-actions

github-actions Bot commented Aug 28, 2026 •
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Sim World

Simulated world deterministic testing for races. Traces

🟠 world-sim scenario book — 1 fail of 41 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
✅ 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

@github-actions

github-actions Bot commented Aug 28, 2026 •
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Framework Flow route Step reg. Framework output
hono 200.9 KiB (±0) 40.4 KiB (±0) 1.76 MiB (-108 B)
nextjs-turbopack 206.3 KiB (±0) 439 B (±0) 763.8 KiB (-131 B)
About these numbers

Sizes are gzip; parentheses show the change against main.
Flow route and Step reg. gate this job, on raw bytes rather than the gzip shown, at max(2%, 50.0 KiB). Framework output is informational.

b9acbb3 · run

@NathanColosimo
test(core): cover retained wait wake races
b9acbb3 
Signed-off-by: Nathan Colosimo <110621881+NathanColosimo@users.noreply.github.com>
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@NathanColosimo