[test] workflow-server PR #1085 by vercel-gh-bot-2[bot] · Pull Request #4466 · vercel/workflow

vercel-gh-bot-2 · 2026-09-28T21:15:06Z

This PR was automatically created to test a workflow-server preview deployment.

This PR will be automatically closed after 24 hours.

…5uqd5talv.vercel.sh

changeset-bot · 2026-09-28T21:15:14Z

⚠️ No Changeset found

Latest commit: 2ba8ffd

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vercel · 2026-09-28T21:15:21Z

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

Project	Deployment	Actions	Updated
example-nextjs-workflow-turbopack	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
example-nextjs-workflow-webpack	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
example-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-astro-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-express-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-fastify-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-hono-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-nestjs-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-nitro-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-nuxt-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-python-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-sveltekit-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-tanstack-start-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workbench-vite-workflow	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workflow-swc-playground	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workflow-tarballs	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC
workflow-web	Ready	Preview, v0	Sep 28, 2026 9:20pm UTC

github-actions · 2026-09-28T21:19:25Z

Sim World

Simulated world deterministic testing for races. Traces

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

fence=per-spec

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

Full trace: world-sim.txt

github-actions · 2026-09-28T21:19:40Z

🧪 E2E Test Results

❌ Some tests failed

❌ Failed E2E Tests

▲ Vercel Production (26 failed)

astro-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

astro-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

example-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

example-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

express-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

express-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

fastify-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

fastify-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

hono-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

hono-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nest-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nest-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nextjs-turbopack-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nextjs-turbopack-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nextjs-webpack-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nextjs-webpack-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nitro-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nitro-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nuxt-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nuxt-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

sveltekit-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

sveltekit-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

tanstack-start-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

tanstack-start-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

vite-node (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

vite-quickjs (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

vercel-http-transport (6 failed)

example (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

express (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

hono (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nextjs-turbopack (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nitro (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

vite (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

vercel-ws-transport (4 failed)

example (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

express (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

nextjs-turbopack (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

vite (1 failed):

createHook({ experimental_force: true }) declines to take a token from a run whose runtime predates involuntary disposal: the claimer gets an ordinary HookConflictError

⚠️ Flaky E2E Tests (passed on retry)

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

a run can take over its own earlier hook (sveltekit · local-dev / local / node / stable)
a run can take over its own earlier hook (nextjs-webpack · local-prod / local / quickjs / stable)
hookGetConflictWorkflow - awaiting hook.getConflict() registers hook without payload (nextjs-webpack · local-dev / local / node / stable)

🛠 Infra Events (absorbed by the harness)

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

cold-start-warmup · suite warmup (tanstack-start) · at 21:23:40Z · abandoned wrun_01M3MYD5PTFQFKGVR83FFAN5HY
run-pickup-stall · hookCleanupTestWorkflow - hook token reuse after workflow completion (nextjs-webpack) · at 21:28:51Z · abandoned wrun_01M3MYPW4PPT10N9SJNQEM96HB
run-pickup-stall · hookGetConflictWorkflow - awaiting hook.getConflict() registers hook without payload (nextjs-webpack) · at 21:28:59Z · abandoned wrun_01M3MYQ3XPP283YVV1NEN064QE
run-pickup-stall · ChainableService.processWithThis - static step methods using this to reference the class (nextjs-webpack) · at 21:30:16Z · abandoned wrun_01M3MYSF29XV38SN9Y5KN3QDYY

E2E Test Summary

Summary

	Passed	Failed	Skipped	Total
❌ ▲ Vercel Production	3852	26	739	4617
✅ 💻 Local Development	4238	0	550	4788
✅ 📦 Local Production	4238	0	550	4788
✅ 🐘 Local Postgres	4238	0	550	4788
✅ 🪟 Windows	340	0	2	342
✅ 🌐 Cross-language Conformance	68	0	84	152
❌ vercel-http-transport	867	6	153	1026
✅ vercel-multi-region	27	0	0	27
❌ vercel-ws-transport	587	4	93	684
Total	18455	36	2721	21212

Details by Category

❌ ▲ Vercel Production

App	Passed	Failed	Skipped
❌ astro-node	140	1	30
❌ astro-quickjs	140	1	30
❌ example-node	140	1	30
❌ example-quickjs	140	1	30
❌ express-node	140	1	30
❌ express-quickjs	140	1	30
❌ fastify-node	140	1	30
❌ fastify-quickjs	140	1	30
❌ hono-node	140	1	30
❌ hono-quickjs	140	1	30
❌ nest-node	140	1	30
❌ nest-quickjs	140	1	30
❌ nextjs-turbopack-node	167	1	3
❌ nextjs-turbopack-quickjs	167	1	3
❌ nextjs-webpack-node	167	1	3
❌ nextjs-webpack-quickjs	167	1	3
❌ nitro-node	140	1	30
❌ nitro-quickjs	140	1	30
❌ nuxt-node	140	1	30
❌ nuxt-quickjs	140	1	30
✅ python-node	66	0	105
❌ sveltekit-node	159	1	11
❌ sveltekit-quickjs	159	1	11
❌ tanstack-start-node	140	1	30
❌ tanstack-start-quickjs	140	1	30
❌ vite-node	140	1	30
❌ vite-quickjs	140	1	30

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable-node	142	29
✅ astro-stable-quickjs	142	29
✅ express-stable-node	142	29
✅ express-stable-quickjs	142	29
✅ fastify-stable-node	142	29
✅ fastify-stable-quickjs	142	29
✅ hono-stable-node	142	29
✅ hono-stable-quickjs	142	29
✅ nest-stable-node	142	29
✅ nest-stable-quickjs	142	29
✅ nextjs-turbopack-canary-node	170	1
✅ nextjs-turbopack-canary-quickjs	170	1
✅ nextjs-turbopack-stable-node	170	1
✅ nextjs-turbopack-stable-quickjs	170	1
✅ nextjs-webpack-canary-node	170	1
✅ nextjs-webpack-canary-quickjs	170	1
✅ nextjs-webpack-stable-node	170	1
✅ nextjs-webpack-stable-quickjs	170	1
✅ nitro-stable-node	142	29
✅ nitro-stable-quickjs	142	29
✅ nuxt-stable-node	142	29
✅ nuxt-stable-quickjs	142	29
✅ sveltekit-stable-node	161	10
✅ sveltekit-stable-quickjs	161	10
✅ tanstack-start-node	142	29
✅ tanstack-start-quickjs	142	29
✅ vite-stable-node	142	29
✅ vite-stable-quickjs	142	29

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable-node	142	29
✅ astro-stable-quickjs	142	29
✅ express-stable-node	142	29
✅ express-stable-quickjs	142	29
✅ fastify-stable-node	142	29
✅ fastify-stable-quickjs	142	29
✅ hono-stable-node	142	29
✅ hono-stable-quickjs	142	29
✅ nest-stable-node	142	29
✅ nest-stable-quickjs	142	29
✅ nextjs-turbopack-canary-node	170	1
✅ nextjs-turbopack-canary-quickjs	170	1
✅ nextjs-turbopack-stable-node	170	1
✅ nextjs-turbopack-stable-quickjs	170	1
✅ nextjs-webpack-canary-node	170	1
✅ nextjs-webpack-canary-quickjs	170	1
✅ nextjs-webpack-stable-node	170	1
✅ nextjs-webpack-stable-quickjs	170	1
✅ nitro-stable-node	142	29
✅ nitro-stable-quickjs	142	29
✅ nuxt-stable-node	142	29
✅ nuxt-stable-quickjs	142	29
✅ sveltekit-stable-node	161	10
✅ sveltekit-stable-quickjs	161	10
✅ tanstack-start-node	142	29
✅ tanstack-start-quickjs	142	29
✅ vite-stable-node	142	29
✅ vite-stable-quickjs	142	29

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable-node	142	29
✅ astro-stable-quickjs	142	29
✅ express-stable-node	142	29
✅ express-stable-quickjs	142	29
✅ fastify-stable-node	142	29
✅ fastify-stable-quickjs	142	29
✅ hono-stable-node	142	29
✅ hono-stable-quickjs	142	29
✅ nest-stable-node	142	29
✅ nest-stable-quickjs	142	29
✅ nextjs-turbopack-canary-node	170	1
✅ nextjs-turbopack-canary-quickjs	170	1
✅ nextjs-turbopack-stable-node	170	1
✅ nextjs-turbopack-stable-quickjs	170	1
✅ nextjs-webpack-canary-node	170	1
✅ nextjs-webpack-canary-quickjs	170	1
✅ nextjs-webpack-stable-node	170	1
✅ nextjs-webpack-stable-quickjs	170	1
✅ nitro-stable-node	142	29
✅ nitro-stable-quickjs	142	29
✅ nuxt-stable-node	142	29
✅ nuxt-stable-quickjs	142	29
✅ sveltekit-stable-node	161	10
✅ sveltekit-stable-quickjs	161	10
✅ tanstack-start-node	142	29
✅ tanstack-start-quickjs	142	29
✅ vite-stable-node	142	29
✅ vite-stable-quickjs	142	29

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack-node	170	0	1
✅ nextjs-turbopack-quickjs	170	0	1

✅ 🌐 Cross-language Conformance

App	Passed	Failed	Skipped
✅ python	68	0	84

❌ vercel-http-transport

App	Passed	Failed	Skipped
❌ example	140	1	30
❌ express	140	1	30
❌ hono	140	1	30
❌ nextjs-turbopack	167	1	3
❌ nitro	140	1	30
❌ vite	140	1	30

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

❌ vercel-ws-transport

App	Passed	Failed	Skipped
❌ example	140	1	30
❌ express	140	1	30
❌ nextjs-turbopack	167	1	3
❌ vite	140	1	30

📋 View full workflow run

github-actions · 2026-09-28T21:20:12Z

📊 Workflow Benchmarks

commit 2ba8ffd · Mon, 28 Sep 2026 21:39:44 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	382 (-48%) 💚	2394 🔴 (+119%) 🔻	2425 🔴 (+118%) 🔻	2819 🔴 (+134%) 🔻	30
TTFS	stream	2212 (+905%) 🔻	2327 🔴 (+121%) 🔻	2361 🔴 (+115%) 🔻	2424 🔴 (+70%) 🔻	30
TTFS	hook + stream	684 (-22%) 💚	2634 🔴 (+98%) 🔻	2661 🔴 (+90%) 🔻	3032 🔴 (+94%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	633 (-27%) 💚	1173 (-31%) 💚	2915 (+63%) 🔻	3139 (+68%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	3134 (+37%) 🔻	6064 (+67%) 🔻	6749 (+79%) 🔻	10719 (+48%) 🔻	10
STSO	1020 steps (inline)	119 (+19%) 🔻	149 (+15%)	163 (+5.8%)	221 (+8.9%)	1019
WO	1020 steps	148953 (+13%)	148953 (+13%)	148953 (+13%)	148953 (+13%)	1
CRTT	first chunk (pooled)	63 (-13%)	105 (-26%) 💚	123 (-42%) 💚	135 (-62%) 💚	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	88.5 (-10%)	116 (-40%)	145 (-52%)	261 (-47%)	94.5 (-58%)	10
size sweep (100/s, 160B-12KB)	87 (-16%)	125 (-45%)	160 (-55%)	343 (-46%)	117 (-45%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	104 (-24%)	128 (-33%)	150 (-53%)	215 (-63%)	138 (-68%)	3
replay eve-gpt-5.6-sol-2000t (1x)	80 (-23%)	121 (-39%)	142 (-54%)	382 (-31%)	320 (-30%)	2
replay eve-gpt-5.6-sol-2000t (2x)	120 (-15%)	139 (-57%)	174 (-64%)	255 (-73%)	168 (-64%)	3

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

1020 steps (inline)

Cumulative STSO time: main 131526ms → this run 148524ms (Δ +16998ms, +13%)

100-150 ms  ███████████████████┃████  main 899  this 767  -132
150-200 ms  ███░░┃                    main 108  this 230  +122
200-250 ms  ┃                         main   8  this  16    +8
250-300 ms  ┃                         main   2  this   5    +3
350-400 ms  ┃                         main   1  this   0    -1
400-450 ms  ┃                         main   1  this   0    -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  ······██▁····  103.9 (-34%)  101 (-27%)  145 (-52%)  261 (-47%)  3000
sweep    ······▇█▁····  109.3 (-38%)  103 (-34%)  160 (-55%)  343 (-46%)  3000
gw 1x    ·····▁▆█▁····    107 (-33%)  105 (-23%)  150 (-53%)  215 (-63%)  5295
eve 1x   ·····▁██▁▁···  107.3 (-34%)  100 (-26%)  142 (-54%)  382 (-31%)  5186
eve 2x   ·····▁▅█▁····    119 (-48%)  113 (-48%)  174 (-64%)  255 (-73%)  7779

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

control  █▄▂▂▁▂▁▁▅▄  98–118ms
sweep    ▇▁▁▂▄█▄▂▃▄  100–126ms
gw 1x    ▆█▃▄▃▃▅▇▂▁  101–114ms
eve 1x   ▆▄▂▃▁▃██▆▃  96–119ms
eve 2x   ▂▂▄▃▁▂▅█▅▃  104–143ms

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

sweep  ▆▆██▅▁▁  107–111ms

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

control  █▅▄▂▂▃▃▂▆▁  28–36ms
sweep    ▄▂▄█▇▆▃▁▅▁  43–52ms
gw 1x    ▅▆▆▁▂▄█▂▂▄  29–38ms
eve 1x   ▇▁▂▁▂▅█▄▇▅  20–24ms
eve 2x   █▅▃▄▄▃▄▁▄▆  17–24ms

ℹ️ Metric definitions & methodology

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

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

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

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

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

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

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

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

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

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

github-actions · 2026-09-28T21:25:25Z

Framework	Flow route	Step reg.	Framework output
hono	265.3 KiB (±0)	96.2 KiB (±0)	1.93 MiB (+39 B)
nextjs-turbopack	272.8 KiB (±0)	426 B (±0)	924.9 KiB (-20 B)

About these numbers

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

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test: Update WORKFLOW_SERVER_URL_OVERRIDE to https://workflow-server-…

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[test] workflow-server PR #1085 - #4466

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🧪 E2E Test Results

❌ Failed E2E Tests

vercel-http-transport (6 failed)

vercel-ws-transport (4 failed)

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