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test(next): cover HMR rebuild convergence - #3471

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test(next): cover HMR rebuild convergence#3471
NathanColosimo wants to merge 11 commits into
codex/next-hmr/startup-watchfrom
codex/next-hmr/e2e

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@NathanColosimo

@NathanColosimoNathanColosimo commented Aug 11, 2026•
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Summary

  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS

Testing

  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix

Stack

  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage

Stack created with GitHub Stacks CLI • Give Feedback 💬

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changeset-botBot commented Aug 11, 2026•
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🦋 Changeset detected

Latest commit: 4b8ee7c

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

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

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🧪 E2E Test Results

❌ Some tests failed

❌ Failed E2E Tests

▲ Vercel Production (8 failed)

python-node (8 failed):

  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability

🌐 Cross-language Conformance (9 failed)

python (9 failed):

  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ

vercel-multi-region (1 failed)

nextjs-turbopack (1 failed):

  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run

⚠️ 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.

  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.

34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0

E2E Test Summary

Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category

❌ ▲ Vercel Production

AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028

✅ 💻 Local Development

AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026

✅ 📦 Local Production

AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026

✅ 🐘 Local Postgres

AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026

✅ 🪟 Windows

AppPassedFailedSkipped
✅ nextjs-turbopack-node16000
✅ nextjs-turbopack-quickjs16000

❌ 🌐 Cross-language Conformance

AppPassedFailedSkipped
❌ python09132

✅ vercel-http-transport

AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ hono132028
✅ nextjs-turbopack15703
✅ nitro132028
✅ vite132028

❌ vercel-multi-region

AppPassedFailedSkipped
❌ nextjs-turbopack2610

✅ vercel-ws-transport

AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ nextjs-turbopack15703
✅ vite132028

📋 View full workflow run

@vercel

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📊 Workflow Benchmarks

commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs

Backend: vercel · app: nextjs-turbopack

MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28

Streams

ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)

1020 steps (inline)

Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)

 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1
📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

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

control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

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

sweep ▆▁▁▅▅█▆ 121–126ms

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

control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms
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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041

🔴 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.

This was referenced Aug 11, 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

scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0

Full trace: world-sim.txt

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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.

4b8ee7c · run

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test(next): cover HMR rebuild convergence by NathanColosimo · Pull Request #3471 · vercel/workflow · GitHub
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Summary
  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS
Testing
  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix
Stack
  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage
Stack created with GitHub Stacks CLI • Give Feedback 💬
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🦋 Changeset detected
Latest commit: 4b8ee7c
The changes in this PR will be included in the next version bump.
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🧪 E2E Test Results
❌ Some tests failed
❌ Failed E2E Tests
▲ Vercel Production (8 failed)
python-node (8 failed):
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability
🌐 Cross-language Conformance (9 failed)
python (9 failed):
  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ
vercel-multi-region (1 failed)
nextjs-turbopack (1 failed):
  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run
⚠️ 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.
  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.
34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0
E2E Test Summary
Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category
❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
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📊 Workflow Benchmarks
commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28
Streams
ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)
 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1

📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):
control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):
sweep ▆▁▁▅▅█▆ 121–126ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):
control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms

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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041
🔴 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.

This was referenced Aug 11, 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
scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0
Full trace: world-sim.txt
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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.
4b8ee7c · run
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test(next): cover HMR rebuild convergence by NathanColosimo · Pull Request #3471 · vercel/workflow · GitHub
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Summary
  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS
Testing
  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix
Stack
  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage
Stack created with GitHub Stacks CLI • Give Feedback 💬
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🦋 Changeset detected
Latest commit: 4b8ee7c
The changes in this PR will be included in the next version bump.
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🧪 E2E Test Results
❌ Some tests failed
❌ Failed E2E Tests
▲ Vercel Production (8 failed)
python-node (8 failed):
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability
🌐 Cross-language Conformance (9 failed)
python (9 failed):
  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ
vercel-multi-region (1 failed)
nextjs-turbopack (1 failed):
  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run
⚠️ 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.
  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.
34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0
E2E Test Summary
Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category
❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node16000
✅ nextjs-turbopack-quickjs16000
❌ 🌐 Cross-language Conformance
AppPassedFailedSkipped
❌ python09132
✅ vercel-http-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ hono132028
✅ nextjs-turbopack15703
✅ nitro132028
✅ vite132028
❌ vercel-multi-region
AppPassedFailedSkipped
❌ nextjs-turbopack2610
✅ vercel-ws-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ nextjs-turbopack15703
✅ vite132028
📋 View full workflow run
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, v0Aug 28, 2026 9:31pm
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📊 Workflow Benchmarks
commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28
Streams
ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)
 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1

📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):
control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):
sweep ▆▁▁▅▅█▆ 121–126ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):
control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms

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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041
🔴 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.

This was referenced Aug 11, 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
scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0
Full trace: world-sim.txt
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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.
4b8ee7c · run
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
test(next): cover HMR rebuild convergence by NathanColosimo · Pull Request #3471 · vercel/workflow · GitHub
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test(next): cover HMR rebuild convergence - #3471
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test(next): cover HMR rebuild convergence#3471
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Summary
  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS
Testing
  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix
Stack
  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage
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🦋 Changeset detected
Latest commit: 4b8ee7c
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 0 packages
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
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
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🧪 E2E Test Results
❌ Some tests failed
❌ Failed E2E Tests
▲ Vercel Production (8 failed)
python-node (8 failed):
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability
🌐 Cross-language Conformance (9 failed)
python (9 failed):
  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ
vercel-multi-region (1 failed)
nextjs-turbopack (1 failed):
  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run
⚠️ 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.
  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.
34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0
E2E Test Summary
Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category
❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node16000
✅ nextjs-turbopack-quickjs16000
❌ 🌐 Cross-language Conformance
AppPassedFailedSkipped
❌ python09132
✅ vercel-http-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ hono132028
✅ nextjs-turbopack15703
✅ nitro132028
✅ vite132028
❌ vercel-multi-region
AppPassedFailedSkipped
❌ nextjs-turbopack2610
✅ vercel-ws-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ nextjs-turbopack15703
✅ vite132028
📋 View full workflow run
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, v0Aug 28, 2026 9:31pm
example-nextjs-workflow-webpackReadyReadyPreview, v0Aug 28, 2026 9:31pm
example-workflowReadyReadyPreview, v0Aug 28, 2026 9:31pm
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workbench-express-workflowReadyReadyPreview, v0Aug 28, 2026 9:31pm
workbench-fastify-workflowReadyReadyPreview, v0Aug 28, 2026 9:31pm
workbench-hono-workflowReadyReadyPreview, v0Aug 28, 2026 9:31pm
workbench-nestjs-workflowReadyReadyPreview, v0Aug 28, 2026 9:31pm
workbench-nitro-workflowReadyReadyPreview, v0Aug 28, 2026 9:31pm
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workbench-tanstack-start-workflowReadyReadyPreview, v0Aug 28, 2026 9:31pm
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workflow-webReadyReadyPreview, v0Aug 28, 2026 9:31pm
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📊 Workflow Benchmarks
commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28
Streams
ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)
 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1

📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):
control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):
sweep ▆▁▁▅▅█▆ 121–126ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):
control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms

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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041
🔴 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.

This was referenced Aug 11, 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
scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0
Full trace: world-sim.txt
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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.
4b8ee7c · run
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
test(next): cover HMR rebuild convergence by NathanColosimo · Pull Request #3471 · vercel/workflow · GitHub
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test(next): cover HMR rebuild convergence - #3471
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test(next): cover HMR rebuild convergence#3471
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Summary
  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS
Testing
  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix
Stack
  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage
Stack created with GitHub Stacks CLI • Give Feedback 💬
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🦋 Changeset detected
Latest commit: 4b8ee7c
The changes in this PR will be included in the next version bump.
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🧪 E2E Test Results
❌ Some tests failed
❌ Failed E2E Tests
▲ Vercel Production (8 failed)
python-node (8 failed):
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability
🌐 Cross-language Conformance (9 failed)
python (9 failed):
  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ
vercel-multi-region (1 failed)
nextjs-turbopack (1 failed):
  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run
⚠️ 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.
  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.
34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0
E2E Test Summary
Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category
❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
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📋 View full workflow run
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📊 Workflow Benchmarks
commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28
Streams
ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)
 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1

📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):
control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):
sweep ▆▁▁▅▅█▆ 121–126ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):
control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms

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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041
🔴 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.

This was referenced Aug 11, 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
scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0
Full trace: world-sim.txt
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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.
4b8ee7c · run
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// Auto-enable theater mode on YouTube
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test(next): cover HMR rebuild convergence by NathanColosimo · Pull Request #3471 · vercel/workflow · GitHub
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test(next): cover HMR rebuild convergence - #3471
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test(next): cover HMR rebuild convergence#3471
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Summary
  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS
Testing
  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix
Stack
  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage
Stack created with GitHub Stacks CLI • Give Feedback 💬
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🦋 Changeset detected
Latest commit: 4b8ee7c
The changes in this PR will be included in the next version bump.
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🧪 E2E Test Results
❌ Some tests failed
❌ Failed E2E Tests
▲ Vercel Production (8 failed)
python-node (8 failed):
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability
🌐 Cross-language Conformance (9 failed)
python (9 failed):
  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ
vercel-multi-region (1 failed)
nextjs-turbopack (1 failed):
  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run
⚠️ 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.
  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.
34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0
E2E Test Summary
Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category
❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node16000
✅ nextjs-turbopack-quickjs16000
❌ 🌐 Cross-language Conformance
AppPassedFailedSkipped
❌ python09132
✅ vercel-http-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ hono132028
✅ nextjs-turbopack15703
✅ nitro132028
✅ vite132028
❌ vercel-multi-region
AppPassedFailedSkipped
❌ nextjs-turbopack2610
✅ vercel-ws-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ nextjs-turbopack15703
✅ vite132028
📋 View full workflow run
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, v0Aug 28, 2026 9:31pm
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📊 Workflow Benchmarks
commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28
Streams
ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)
 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1

📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):
control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):
sweep ▆▁▁▅▅█▆ 121–126ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):
control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms

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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041
🔴 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.

This was referenced Aug 11, 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
scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0
Full trace: world-sim.txt
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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.
4b8ee7c · run
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test(next): cover HMR rebuild convergence by NathanColosimo · Pull Request #3471 · vercel/workflow · GitHub
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test(next): cover HMR rebuild convergence - #3471
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Summary
  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS
Testing
  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix
Stack
  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage
Stack created with GitHub Stacks CLI • Give Feedback 💬
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🦋 Changeset detected
Latest commit: 4b8ee7c
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 0 packages
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🧪 E2E Test Results
❌ Some tests failed
❌ Failed E2E Tests
▲ Vercel Production (8 failed)
python-node (8 failed):
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability
🌐 Cross-language Conformance (9 failed)
python (9 failed):
  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ
vercel-multi-region (1 failed)
nextjs-turbopack (1 failed):
  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run
⚠️ 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.
  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.
34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0
E2E Test Summary
Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category
❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack-node16000
✅ nextjs-turbopack-quickjs16000
❌ 🌐 Cross-language Conformance
AppPassedFailedSkipped
❌ python09132
✅ vercel-http-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ hono132028
✅ nextjs-turbopack15703
✅ nitro132028
✅ vite132028
❌ vercel-multi-region
AppPassedFailedSkipped
❌ nextjs-turbopack2610
✅ vercel-ws-transport
AppPassedFailedSkipped
✅ example132028
✅ express132028
✅ nextjs-turbopack15703
✅ vite132028
📋 View full workflow run
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, v0Aug 28, 2026 9:31pm
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📊 Workflow Benchmarks
commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28
Streams
ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)
 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1

📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):
control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):
sweep ▆▁▁▅▅█▆ 121–126ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):
control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms

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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041
🔴 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.

This was referenced Aug 11, 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
scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0
Full trace: world-sim.txt
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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.
4b8ee7c · run
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test(next): cover HMR rebuild convergence by NathanColosimo · Pull Request #3471 · vercel/workflow · GitHub
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test(next): cover HMR rebuild convergence - #3471
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test(next): cover HMR rebuild convergence#3471
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Summary
  • make expected hot, full, and skipped rebuild counts explicit
  • verify body-only edits stay hot while import, add, and remove changes rediscover workflows
  • verify editing an imported dependency updates workflow execution on stable and canary Next.js
  • test Next.js 16.3.1 and 16.3.1-canary.21 across Turbopack, webpack, Node.js, and QuickJS
Testing
  • pnpm --filter @workflow/next build
  • pnpm --filter @workflow/next test
  • focused local Next.js 16.3.1-canary.21 HMR scenario with Turbopack and webpack
  • GitHub Actions Next.js local-development matrix
Stack
  1. fix(next): converge workflow HMR rebuilds #3333: rebuild convergence and unit coverage
  2. fix(next): watch before initial build #3470: close the startup observation gap
  3. This PR: stable/canary end-to-end HMR coverage
Stack created with GitHub Stacks CLI • Give Feedback 💬
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🦋 Changeset detected
Latest commit: 4b8ee7c
The changes in this PR will be included in the next version bump.
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🧪 E2E Test Results
❌ Some tests failed
❌ Failed E2E Tests
▲ Vercel Production (8 failed)
python-node (8 failed):
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM | 🔍 observability
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG | 🔍 observability
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645 | 🔍 observability
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP | 🔍 observability
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP | 🔍 observability
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ | 🔍 observability
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA | 🔍 observability
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ | 🔍 observability
🌐 Cross-language Conformance (9 failed)
python (9 failed):
  • deploymentId: 'latest' is a no-op in non-Vercel worlds | wrun_01M154T0C6B4K3YG51X7RJFTP4
  • promiseAllWorkflow | wrun_41M154EGZS0GGPSAM72DPMN5KM
  • sleepingWorkflow | wrun_41M154F38K0GWVPPFAFVV8BVSG
  • parallelSleepWorkflow | wrun_41M154F54Q0GZ8B92XSGZJH645
  • nullByteWorkflow | wrun_41M154FBR30GJGS67A2R3RDWVP
  • cancelRun - cancelling a running workflow | wrun_41M154KV190GXYGDMHC1YF42CP
  • cancelRun via CLI - cancelling a running workflow | wrun_41M154KX1M0GP0120F0CGPM7WZ
  • sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_41M154M3B30GP39C3G4C8Y3RNA
  • resilient start: addTenWorkflow completes when run_created returns 500 | wrun_41M154MJJC0GQCARVM97Z75YWJ
vercel-multi-region (1 failed)
nextjs-turbopack (1 failed):
  • multi-region (world-vercel) hooks on non-iad1 runs hook created by a sfo1 run resolves by token and resumes the run
⚠️ 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.
  • abortExternalSignalInFlightWorkflow: external abort fires mid-flight, propagates to nested steps (nextjs-webpack)
  • abortReasonWorkflow: abort reason preserved across boundaries (nextjs-webpack)
  • addTenWorkflow (sveltekit)
  • cancelRun via CLI - cancelling a running workflow (astro)
  • cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
  • deploymentId: 'latest' is a no-op in non-Vercel worlds (sveltekit)
  • hookWorkflow (tanstack-start)
  • promiseAllWorkflow (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.
34 infra events
  • cold-start-warmup · suite warmup (python) · at 21:31:17Z · abandoned wrun_41M154DV480GK5DG32QYJJW5SW · (+7 more)
  • run-pickup-stall · sleepingWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G5
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBA0GQW8XZ98KF8M1G6
  • run-pickup-stall · nullByteWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGBE0GVKD91KJMGPMZG9
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:31:34Z · abandoned wrun_41M154HGB40GW3DEAP76G0DR5G
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:31:34Z · abandoned wrun_41M154HGVK0GRDWXW8X461WRWS
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:32:08Z · abandoned wrun_41M154JJ4G0GTGK66F53PJX95G
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC130GGP1J2MHG7SERAG
  • run-pickup-stall · nullByteWorkflow (python) · at 21:32:34Z · abandoned wrun_41M154KC1K0GSA1GK18421W1AV
  • run-pickup-stall · sleepingWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KC450GPTPFCZPT5V6FT0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:32:35Z · abandoned wrun_41M154KCNA0GQ8R8H1BNBECC1R
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:33:15Z · abandoned wrun_41M154KJM60GX373EKEBK41HGF
  • cold-start-warmup · suite warmup (tanstack-start) · at 21:34:22Z · abandoned wrun_01M154PAP2BXEB809FD3JHNHC4
  • cold-start-warmup · suite warmup (python) · at 21:34:40Z · abandoned wrun_01M154M1Y8QTR5DJMHXDBRVC5P · (+7 more)
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:34:55Z · abandoned wrun_01M154QQ35S3TSZTHH3ZF0GCQV
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ36FRC2PYN073DMC2J2
  • run-pickup-stall · sleepingWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3ACJNZPSP1S5PS2GFN
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3D02EWGA91RX67Y59M
  • run-pickup-stall · nullByteWorkflow (python) · at 21:34:55Z · abandoned wrun_01M154QQ3F0KH6MGCWJF8PRDN1
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:35:06Z · abandoned wrun_41M154NFFZ0GTKJ180F8KDVJ6M
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:35:07Z · abandoned wrun_41M154NES30GN7B7S1YKF9CX7Y
  • run-pickup-stall · deploymentId: 'latest' is a no-op in non-Vercel worlds (python) · at 21:35:55Z · abandoned wrun_01M154SHPTPR3YEJ79B9RPPW8R
  • run-pickup-stall · sleepingWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPYGC741M76QBPYNHTS
  • run-pickup-stall · promiseAllWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHPW0XY8Y2HA72GHYHS0
  • run-pickup-stall · parallelSleepWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQ3X57P9JGXW7ZN6BNT
  • run-pickup-stall · nullByteWorkflow (python) · at 21:35:55Z · abandoned wrun_01M154SHQD8XXPRS57NPECTZ6W
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAFH2PXXZAEC4CP8QW6
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:36:55Z · abandoned wrun_01M154VCAN63FGA4PADKAFQGSW
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:36:55Z · abandoned wrun_01M154VCASYXMNDF647BE3MV30
  • run-pickup-stall · cancelRun - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9P7C0NTC1EFB715P3C5
  • run-pickup-stall · cancelRun via CLI - cancelling a running workflow (python) · at 21:37:25Z · abandoned wrun_01M154W9PBA5MKCYKJA383NCY4
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (python) · at 21:37:55Z · abandoned wrun_01M154X6XYRM3JFHRF1NTPF3J9
  • run-pickup-stall · hookWithSleepFinalStepWorkflow - step only on final payload (nextjs-webpack) · at 21:44:14Z · abandoned wrun_01M1558RWFQBMG44A0TQFAPK3K
  • run-pickup-stall · sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration (nextjs-webpack) · at 21:44:21Z · abandoned wrun_01M1558ZPQ82BX6DM0N5CTW5Q0
E2E Test Summary
Summary
PassedFailedSkippedTotal
❌ ▲ Vercel Production357087424320
✅ 💻 Local Development392205584480
✅ 📦 Local Production392205584480
✅ 🐘 Local Postgres392205584480
✅ 🪟 Windows32000320
❌ 🌐 Cross-language Conformance09132141
✅ vercel-http-transport8170143960
❌ vercel-multi-region261027
✅ vercel-ws-transport553087640
Total1705218277819848
Details by Category
❌ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro-node132028
✅ astro-quickjs132028
✅ example-node132028
✅ example-quickjs132028
✅ express-node132028
✅ express-quickjs132028
✅ fastify-node132028
✅ fastify-quickjs132028
✅ hono-node132028
✅ hono-quickjs132028
✅ nest-node132028
✅ nest-quickjs132028
✅ nextjs-turbopack-node15703
✅ nextjs-turbopack-quickjs15703
✅ nextjs-webpack-node15703
✅ nextjs-webpack-quickjs15703
✅ nitro-node132028
✅ nitro-quickjs132028
✅ nuxt-node132028
✅ nuxt-quickjs132028
❌ python-node08152
✅ sveltekit-node15109
✅ sveltekit-quickjs15109
✅ tanstack-start-node132028
✅ tanstack-start-quickjs132028
✅ vite-node132028
✅ vite-quickjs132028
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
✅ sveltekit-stable-quickjs15307
✅ tanstack-start-node134026
✅ tanstack-start-quickjs134026
✅ vite-stable-node134026
✅ vite-stable-quickjs134026
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable-node134026
✅ astro-stable-quickjs134026
✅ express-stable-node134026
✅ express-stable-quickjs134026
✅ fastify-stable-node134026
✅ fastify-stable-quickjs134026
✅ hono-stable-node134026
✅ hono-stable-quickjs134026
✅ nest-stable-node134026
✅ nest-stable-quickjs134026
✅ nextjs-turbopack-canary-node141019
✅ nextjs-turbopack-canary-quickjs141019
✅ nextjs-turbopack-stable-node16000
✅ nextjs-turbopack-stable-quickjs16000
✅ nextjs-webpack-canary-node141019
✅ nextjs-webpack-canary-quickjs141019
✅ nextjs-webpack-stable-node16000
✅ nextjs-webpack-stable-quickjs16000
✅ nitro-stable-node134026
✅ nitro-stable-quickjs134026
✅ nuxt-stable-node134026
✅ nuxt-stable-quickjs134026
✅ sveltekit-stable-node15307
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📋 View full workflow run
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📊 Workflow Benchmarks
commit 4b8ee7c · Fri, 28 Aug 2026 21:52:57 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioBest (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstep171 (-75%) 💚1391 🔴 (+23%) 🔻1441 🔴 (+26%) 🔻1623 🔴 (+41%) 🔻30
TTFSstream221 (-3.5%)1331 🔴 (+23%) 🔻1400 🔴 (+27%) 🔻1471 🔴 (+26%) 🔻30
TTFShook + stream1469 (+200%) 🔻1605 🔴 (+19%) 🔻1622 🔴 (+17%) 🔻2310 🔴 (+59%) 🔻30
Fan-out TTFSPromise.all(100 steps)605 (+7.5%)2221 (+30%) 🔻2326 (+28%) 🔻2435 (+24%) 🔻10
Fan-out TTLSPromise.all(100 steps)1872 (-15%)4302 (+16%) 🔻5100 (+35%) 🔻7669 (-2.5%)10
STSO1020 steps (inline)70 (-38%) 💚142 (+1.4%)166 (+3.1%)251 (+27%) 🔻1019
WO1020 steps140531 (±0%)140531 (±0%)140531 (±0%)140531 (±0%)1
CRTTfirst chunk (pooled)101 (-12%)140 (-40%) 💚175 (-66%) 💚227 (-66%) 💚28
Streams
ScenarioCRTT 1stp75p90p99CDV maxiters
paced control (100/s, 60B)136 (-5%)179 (-64%)334 (-52%)3903 (+297%)177 (-61%)10
size sweep (100/s, 160B-12KB)124 (-31%)146 (-38%)196 (-65%)389 (-57%)119 (-50%)10
replay gateway-gpt-5.4-nano-2000t (1x)109 (-44%)141 (-40%)182 (-59%)347 (-64%)281 (-62%)3
replay eve-gpt-5.6-sol-2000t (1x)172 (-56%)147 (-74%)199 (-89%)387 (-91%)336 (-84%)2
replay eve-gpt-5.6-sol-2000t (2x)114 (-27%)182 (-75%)250 (-76%)409 (-69%)232 (-59%)3
📈 STSO distribution vs main (inline / queue-hop histograms)
1020 steps (inline)
Cumulative STSO time: main 139837ms → this run 138960ms (Δ -877ms, -1%)
 50-100 ms ┃ main 0 this 2 +2
100-150 ms ██████████████████████┃█ main 857 this 820 -37
150-200 ms ████┃ main 152 this 164 +12
200-250 ms ┃ main 8 this 21 +13
250-300 ms ┃ main 0 this 5 +5
300-350 ms ┃ main 2 this 5 +3
400-450 ms ┃ main 0 this 1 +1
450-500 ms ┃ main 0 this 1 +1

📈 CRTT drill-down vs main (RTT distributions & profiles)
variant RTT 1ms→5s+ avg p50 p90 p99 n
control ······▄█▂▁▁▁· 339.2 (+21%) 118 (-39%) 334 (-52%) 3903 (+297%) 3000
sweep ······▄█▁···· 123.4 (-41%) 114 (-34%) 196 (-65%) 389 (-57%) 3000
gw 1x ·····▁▄█▁···· 123.8 (-40%) 112 (-31%) 182 (-59%) 347 (-64%) 5295
eve 1x ·····▁▅█▂···· 127.9 (-70%) 112 (-38%) 199 (-89%) 387 (-91%) 5186
eve 2x ·····▁▃█▂▁··· 150.5 (-61%) 134 (-46%) 250 (-76%) 409 (-69%) 7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):
control ▁▁▃█▇▇▆▆▅▅ 136–507ms
sweep █▄▄▃▃▆▆▂▁▆ 111–138ms
gw 1x ▆█▂▂▁▃▂▃▃▂ 112–149ms
eve 1x ▄▆▄▂▁▇▄▄▆█ 107–148ms
eve 2x ▄▃▄▄▁▃▄█▄▃ 122–193ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):
sweep ▆▁▁▅▅█▆ 121–126ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):
control ▁▂█▁▁▁▁▁▁▁ 37–115ms
sweep ▄▄▆▃▅█▁▂▂▆ 44–60ms
gw 1x ▆█▂▁▄▆▄▄▃▄ 30–48ms
eve 1x ▂▅▁▁▂▆▄▁▂█ 23–36ms
eve 2x ▇▆▃▃▃▂▂▃▁█ 23–32ms

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-2000teaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041
🔴 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.

This was referenced Aug 11, 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
scenariooutcomeeventsvirtreplayviolations
✅ smoke-no-stepscompleted30msok0
✅ smoke-one-stepcompleted60msok0
✅ hook-at-step-startedcompleted120msok0
✅ hook-at-step-completedcompleted120msok0
✅ hook-at-hook-createdcompleted120msok0
✅ deadline-hook-winscompleted71.0hok0
✅ deadline-expirescompleted71.0hok0
✅ long-sleepcompleted1130.0dok0
✅ hook-never-arrivesstalled30msskipped0
✅ step-retries-twicecompleted102.0sok0
✅ parallel-stepscompleted90msok0
✅ hook-on-execution-statecompleted120msok0
✅ peek-hook-before-branchcompleted120msok0
✅ peek-hook-after-branchcompleted120msok0
✅ peek-hook-at-registrationcompleted120msok0
✅ race-hook-before-probecompleted120msok0
✅ race-hook-after-probecompleted120msok0
✅ race-duplicate-deliverycompleted130msok0
✅ attr-hook-before-stepcompleted110msok0
✅ attr-hook-after-stepcompleted110msok0
✅ attr-from-step-bodycompleted130msok0
✅ fork-hook-after-timeoutcompleted141.0mok0
✅ fork-hook-before-timeoutcompleted141.0mok0
✅ count-hook-after-timeoutcompleted171.0mok0
✅ count-hook-before-timeoutcompleted201.0mok0
✅ stale-read-step-count-forkcompleted201.0mok0
✅ stale-read-equal-step-countscompleted141.0mok0
✅ step-vs-step-forkcompleted120msok0
✅ step-vs-step-fork-fencedcompleted120msok0
✅ fence-catches-benign-directioncompleted125msok0
✅ in-flight-before-decisioncompleted171.0mok0
❌ in-flight-before-decision-countedcompleted171.0mok0
✅ in-flight-after-decisioncompleted192.0mok0
✅ stale-read-step-count-fork-fencedcompleted201.0mok0
✅ fork-hook-winscompleted131.0mok0
✅ fork-timeout-winscompleted131.0mok0
✅ unclaimed-payload-under-forkcompleted171.0mok0
✅ claimed-payload-under-forkcompleted171.0mok0
✅ writers-independent-step-bodiescompleted120msok0
✅ writers-scripted-tempocompleted120msok0
✅ cancel-mid-stepcancelled70msskipped0
Full trace: world-sim.txt
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FrameworkFlow routeStep reg.Framework output
hono200.9 KiB (±0)40.4 KiB (±0)1.76 MiB (±0)
nextjs-turbopack206.3 KiB (±0)439 B (±0)767.0 KiB (+3.1 KiB)
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.
4b8ee7c · run
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