WIP: add standalone World execution API and Postgres implementation by shalabhc · Pull Request #4081 · vercel/workflow

shalabhc · 2026-09-10T19:55:54Z

Scope

Standalone, experimental World execution API and PostgreSQL implementation.

Shared platform-neutral execution contracts, complete-prefix validation, ordered exchange, durable receipts, and sticky invariant faults.
Core session integration with a retained Node workflow VM, sequential inline steps, separate commit/drive lanes, and cancellation handling.
Opt-in @workflow/world-postgres/execution backend: transactional journal/receipts/hook bindings, PostgreSQL inbox, advisory-lock ownership plus a durable grant, and Graphile wake delivery.
Inputs can reach a live session while its step body is blocked. Submission success requires a journal receipt, not merely inbox persistence.
The final diff is limited to @workflow/world, @workflow/core, @workflow/world-postgres, and their changeset.

Usage and limits

Configuration, protocol, and test instructions.

Select WORKFLOW_TARGET_WORLD=@workflow/world-postgres/execution before building the application and provide WORKFLOW_POSTGRES_URL.

This remains a WIP reference profile: root-only Node VM, sequential inline steps, bounded full snapshots (1,024 events / 4 MiB), and limited legacy read projections. Streams, global run listing, full pagination/resolve-data compatibility, retention/GC, scopes, remote workers, and a production failure policy are not implemented. All processes sharing a namespace must run the same workflow code.

Unexpected heads and identity/prefix violations fail closed. Unclean owner loss deliberately quarantines the execution before replacement code can run. A clean suspension may later replay its durable prefix. Database ownership cannot undo already-issued external side effects.

Verification

Local verification at 2a7fc1b5f:

pnpm exec turbo build --filter=@workflow/core... — passed.
pnpm --filter @workflow/world-postgres build — passed.
Postgres/Graphile integration plus queue regression tests — 26 passed, including 14 real-database integration cases.
Core execution, shared contract, scoped-world, and workflow VM regression suites — 101 passed and 1 expected failure.
Module-scope state suite — 30 passed.
Changeset validation and git diff --check — passed.
Changed-source Biome check — no errors; complexity/non-null-assertion and other warnings remain.

The integration tests exercise atomic batch rollback, exact duplicate receipts, competing heads, hook token conflicts, namespace isolation, cross-host exclusion, unclean owner loss, real VM/inline steps, journal-on-ack hook delivery while a real body is blocked, and cancellation without a late step result.

A broader Turbo dependency traversal was blocked by missing Rust tooling for the compiler package; this is not a claim of a full monorepo build or production conformance. Keep this PR in draft.

Co-Authored-By: shalabhc <shalabh.chaturvedi@vercel.com>

vercel · 2026-09-10T19:56:01Z

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

Project	Deployment	Actions	Updated
example-nextjs-workflow-turbopack	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
example-nextjs-workflow-webpack	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
example-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-astro-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-express-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-fastify-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-hono-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-nestjs-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-nitro-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-nuxt-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-python-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-sveltekit-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-tanstack-start-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workbench-vite-workflow	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workflow-docs	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workflow-swc-playground	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workflow-tarballs	Ready	Preview, v0	Sep 11, 2026 4:29am UTC
workflow-web	Ready	Preview, v0	Sep 11, 2026 4:29am UTC

changeset-bot · 2026-09-10T19:56:02Z

🦋 Changeset detected

Latest commit: 2a7fc1b

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

This PR includes changesets to release 20 packages

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

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

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

github-actions · 2026-09-10T19:56:13Z

📊 Workflow Benchmarks

commit 2a7fc1b · Fri, 11 Sep 2026 04:50:39 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	1257 (+68%) 🔻	1375 🔴 (+25%) 🔻	1395 🔴 (+21%) 🔻	1429 🔴 (+5.2%)	30
TTFS	stream	1108 (+336%) 🔻	1343 🔴 (+25%) 🔻	1368 🔴 (+23%) 🔻	1389 🔴 (+24%) 🔻	30
TTFS	hook + stream	1473 (+70%) 🔻	1600 🔴 (+23%) 🔻	1640 🔴 (+20%) 🔻	5931 🔴 (+207%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	568 (-6.4%)	965 (+18%) 🔻	994 (+19%) 🔻	2014 (+13%)	10
Fan-out TTLS	Promise.all(100 steps)	1499 (-5.4%)	4091 (-8.0%)	5516 (-17%) 💚	8563 (±0%)	10
STSO	1020 steps (inline)	101 (-11%)	132 (-2.9%)	152 (-0.7%)	276 (+40%) 🔻	1019
WO	1020 steps	133446 (-2.0%)	133446 (-2.0%)	133446 (-2.0%)	133446 (-2.0%)	1
CRTT	first chunk (pooled)	59 (-21%) 💚	91 (-33%) 💚	127 (-52%) 💚	314 (+11%)	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	76 (-22%)	147 (-40%)	189 (-61%)	863 (+37%)	111 (-60%)	10
size sweep (100/s, 160B-12KB)	87 (-11%)	159 (-63%)	254 (-65%)	522 (-56%)	143 (-59%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	91 (-36%)	137 (-23%)	203 (-17%)	536 (+14%)	246 (-33%)	3
replay eve-gpt-5.6-sol-2000t (1x)	99 (-12%)	138 (-34%)	186 (-57%)	501 (-56%)	319 (-44%)	2
replay eve-gpt-5.6-sol-2000t (2x)	105 (-22%)	243 (-50%)	2894 (+335%)	4567 (+415%)	1287 (+175%)	3

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

1020 steps (inline)

Cumulative STSO time: main 136104ms → this run 133281ms (Δ -2823ms, -2%)

100-150 ms  ███████████████████████┃  main 894  this 905   +11
150-200 ms  █┃█                       main 117  this  89   -28
200-250 ms  ┃                         main   8  this  10    +2
250-300 ms  ┃                         main   0  this   9    +9
300-350 ms  ┃                         main   0  this   2    +2
350-400 ms  ┃                         main   0  this   3    +3
400-450 ms  ┃                         main   0  this   1    +1

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

variant  RTT 1ms→5s+             avg         p50           p90           p99     n
control  ······▄█▁▁···  131.1 (-35%)  109 (-33%)    189 (-61%)    863 (+37%)  3000
sweep    ······▄█▁▁···  129.5 (-54%)  118 (-38%)    254 (-65%)    522 (-56%)  3000
gw 1x    ·····▁▅█▁▁···  122.5 (-18%)  111 (-18%)    203 (-17%)    536 (+14%)  5295
eve 1x   ·····▁▇█▂▁···  120.5 (-36%)   99 (-26%)    186 (-57%)    501 (-56%)  5186
eve 2x   ·····▁▂█▃▁▁▁·  343.4 (+28%)  152 (-29%)  2894 (+335%)  4567 (+415%)  7779

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

control  ▂▂▄▆█▆▄▂▂▁  112–161ms
sweep    ▆▄▁▂█▆▃▄▄▃  114–149ms
gw 1x    ▁▂▆▄▃▄▃▂▁█  107–153ms
eve 1x   ▅▁▃█▃▄▃▄▃▂  95–166ms
eve 2x   ▃▁▁▁▁▁▂▂▆█  118–1101ms

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

sweep  ▅▆▇█▅▃▁  128–131ms

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

control  ▃▂▁█▂▂▃▃▁▂  34–46ms
sweep    ▇▁▁▆█▇▇█▆▅  36–61ms
gw 1x    ▂▄▆▃▅▇▇▇▁█  29–40ms
eve 1x   █▁▂▄▄▃▃▃▁▅  19–30ms
eve 2x   █▃▁▁▁▂▁▁█▃  20–48ms

📜 Previous results (2)

`7e8ce70`

Fri, 11 Sep 2026 02:53:59 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	215 (-71%) 💚	1235 🔴 (+13%)	1285 🔴 (+11%)	1471 🔴 (+8.3%)	30
TTFS	stream	187 (-26%) 💚	1283 🔴 (+19%) 🔻	1304 🔴 (+18%) 🔻	1978 🔴 (+76%) 🔻	30
TTFS	hook + stream	1445 (+67%) 🔻	1540 🔴 (+18%) 🔻	1590 🔴 (+16%) 🔻	1867 🔴 (-3.5%)	30
Fan-out TTFS	Promise.all(100 steps)	590 (-2.8%)	807 (-1.3%)	936 (+12%)	2937 (+65%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	2158 (+36%) 🔻	8586 (+93%) 🔻	9340 (+41%) 🔻	9487 (+10%)	10
STSO	1020 steps (inline)	114 (±0%)	142 (+4.4%)	159 (+3.9%)	312 (+58%) 🔻	1019
WO	1020 steps	143863 (+5.6%)	143863 (+5.6%)	143863 (+5.6%)	143863 (+5.6%)	1
CRTT	first chunk (pooled)	60 (-20%) 💚	115 (-15%) 💚	140 (-47%) 💚	178 (-37%) 💚	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	90 (-7%)	152 (-38%)	262 (-46%)	548 (-13%)	157 (-44%)	10
size sweep (100/s, 160B-12KB)	84.5 (-13%)	192 (-55%)	312 (-57%)	554 (-53%)	208 (-40%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	101 (-29%)	164 (-8%)	232 (-5%)	409 (-13%)	324 (-11%)	3
replay eve-gpt-5.6-sol-2000t (1x)	121 (+8%)	165 (-21%)	267 (-39%)	775 (-32%)	578 (+1%)	2
replay eve-gpt-5.6-sol-2000t (2x)	108 (-20%)	281 (-42%)	418 (-37%)	881 (-1%)	475 (+1%)	3

`760ba66`

Thu, 10 Sep 2026 21:16:40 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	208 (-80%) 💚	1272 🔴 (+9.5%)	1313 🔴 (+9.5%)	1490 🔴 (+13%)	30
TTFS	stream	1226 (+405%) 🔻	1299 🔴 (+18%) 🔻	1322 🔴 (+12%)	1422 🔴 (-5.8%)	30
TTFS	hook + stream	680 (-44%) 💚	1526 🔴 (+10%)	1545 🔴 (+0.7%)	1755 🔴 (-0.6%)	30
Fan-out TTFS	Promise.all(100 steps)	559 (-16%) 💚	820 (-9.5%)	842 (-55%) 💚	1800 (-8.3%)	10
Fan-out TTLS	Promise.all(100 steps)	1914 (+15%) 🔻	5238 (-9.5%)	5712 (-21%) 💚	7806 (-3.9%)	10
STSO	1020 steps (inline)	116 (+3.6%)	135 (-11%)	151 (-14%)	197 (-34%) 💚	1019
WO	1020 steps	135632 (-10%)	135632 (-10%)	135632 (-10%)	135632 (-10%)	1
CRTT	first chunk (pooled)	52 (-16%) 💚	84 (-35%) 💚	99 (-43%) 💚	184 (-58%) 💚	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	72.5 (-40%)	121 (-54%)	161 (-71%)	378 (-54%)	93 (-71%)	10
size sweep (100/s, 160B-12KB)	69.5 (-40%)	143 (-56%)	266 (-55%)	656 (-16%)	159 (-47%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	85 (-17%)	142 (-36%)	260 (-23%)	637 (+1%)	456 (+7%)	3
replay eve-gpt-5.6-sol-2000t (1x)	62 (-40%)	123 (-46%)	160 (-53%)	278 (-56%)	281 (-27%)	2
replay eve-gpt-5.6-sol-2000t (2x)	67 (-53%)	162 (-50%)	255 (-45%)	619 (-30%)	340 (-46%)	3

ℹ️ Metric definitions & methodology

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

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

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

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

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

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

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

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

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

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

github-actions · 2026-09-10T19:56:14Z

🧪 E2E Test Results

✅ All tests passed

⚠️ Flaky E2E Tests (passed on retry)

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

addTenWorkflow (fastify)
cancelRun via CLI - cancelling a running workflow (nextjs-turbopack)
cancelRun via CLI - cancelling a running workflow (vite)
distributedAbortController - TTL expiration triggers signal (nextjs-webpack)
negative startIndex (reads from end) (express)
promiseRaceWorkflow (express)

🛠 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 04:31:52Z · abandoned wrun_01M27BR3XTGK1D8Z86GYY8KE9Q
run-pickup-stall · hookCleanupTestWorkflow - hook token reuse after workflow completion (nextjs-webpack) · at 04:38:41Z · abandoned wrun_01M27C50AB6MV5354A0HH01JCB

E2E Test Summary

Summary

	Passed	Skipped	Total
✅ ▲ Vercel Production	3662	685	4347
✅ 💻 Local Development	3922	586	4508
✅ 📦 Local Production	3922	586	4508
✅ 🐘 Local Postgres	3922	586	4508
✅ 🪟 Windows	320	2	322
✅ 🌐 Cross-language Conformance	68	74	142
✅ vercel-http-transport	823	143	966
✅ vercel-multi-region	27	0	27
✅ vercel-ws-transport	557	87	644
Total	17223	2749	19972

Details by Category

✅ ▲ Vercel Production

App	Passed	Skipped
✅ astro-node	133	28
✅ astro-quickjs	133	28
✅ example-node	133	28
✅ example-quickjs	133	28
✅ express-node	133	28
✅ express-quickjs	133	28
✅ fastify-node	133	28
✅ fastify-quickjs	133	28
✅ hono-node	133	28
✅ hono-quickjs	133	28
✅ nest-node	133	28
✅ nest-quickjs	133	28
✅ nextjs-turbopack-node	158	3
✅ nextjs-turbopack-quickjs	158	3
✅ nextjs-webpack-node	158	3
✅ nextjs-webpack-quickjs	158	3
✅ nitro-node	133	28
✅ nitro-quickjs	133	28
✅ nuxt-node	133	28
✅ nuxt-quickjs	133	28
✅ python-node	66	95
✅ sveltekit-node	152	9
✅ sveltekit-quickjs	152	9
✅ tanstack-start-node	133	28
✅ tanstack-start-quickjs	133	28
✅ vite-node	133	28
✅ vite-quickjs	133	28

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable-node	134	27
✅ astro-stable-quickjs	134	27
✅ express-stable-node	134	27
✅ express-stable-quickjs	134	27
✅ fastify-stable-node	134	27
✅ fastify-stable-quickjs	134	27
✅ hono-stable-node	134	27
✅ hono-stable-quickjs	134	27
✅ nest-stable-node	134	27
✅ nest-stable-quickjs	134	27
✅ nextjs-turbopack-canary-node	141	20
✅ nextjs-turbopack-canary-quickjs	141	20
✅ nextjs-turbopack-stable-node	160	1
✅ nextjs-turbopack-stable-quickjs	160	1
✅ nextjs-webpack-canary-node	141	20
✅ nextjs-webpack-canary-quickjs	141	20
✅ nextjs-webpack-stable-node	160	1
✅ nextjs-webpack-stable-quickjs	160	1
✅ nitro-stable-node	134	27
✅ nitro-stable-quickjs	134	27
✅ nuxt-stable-node	134	27
✅ nuxt-stable-quickjs	134	27
✅ sveltekit-stable-node	153	8
✅ sveltekit-stable-quickjs	153	8
✅ tanstack-start-node	134	27
✅ tanstack-start-quickjs	134	27
✅ vite-stable-node	134	27
✅ vite-stable-quickjs	134	27

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable-node	134	27
✅ astro-stable-quickjs	134	27
✅ express-stable-node	134	27
✅ express-stable-quickjs	134	27
✅ fastify-stable-node	134	27
✅ fastify-stable-quickjs	134	27
✅ hono-stable-node	134	27
✅ hono-stable-quickjs	134	27
✅ nest-stable-node	134	27
✅ nest-stable-quickjs	134	27
✅ nextjs-turbopack-canary-node	141	20
✅ nextjs-turbopack-canary-quickjs	141	20
✅ nextjs-turbopack-stable-node	160	1
✅ nextjs-turbopack-stable-quickjs	160	1
✅ nextjs-webpack-canary-node	141	20
✅ nextjs-webpack-canary-quickjs	141	20
✅ nextjs-webpack-stable-node	160	1
✅ nextjs-webpack-stable-quickjs	160	1
✅ nitro-stable-node	134	27
✅ nitro-stable-quickjs	134	27
✅ nuxt-stable-node	134	27
✅ nuxt-stable-quickjs	134	27
✅ sveltekit-stable-node	153	8
✅ sveltekit-stable-quickjs	153	8
✅ tanstack-start-node	134	27
✅ tanstack-start-quickjs	134	27
✅ vite-stable-node	134	27
✅ vite-stable-quickjs	134	27

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable-node	134	27
✅ astro-stable-quickjs	134	27
✅ express-stable-node	134	27
✅ express-stable-quickjs	134	27
✅ fastify-stable-node	134	27
✅ fastify-stable-quickjs	134	27
✅ hono-stable-node	134	27
✅ hono-stable-quickjs	134	27
✅ nest-stable-node	134	27
✅ nest-stable-quickjs	134	27
✅ nextjs-turbopack-canary-node	141	20
✅ nextjs-turbopack-canary-quickjs	141	20
✅ nextjs-turbopack-stable-node	160	1
✅ nextjs-turbopack-stable-quickjs	160	1
✅ nextjs-webpack-canary-node	141	20
✅ nextjs-webpack-canary-quickjs	141	20
✅ nextjs-webpack-stable-node	160	1
✅ nextjs-webpack-stable-quickjs	160	1
✅ nitro-stable-node	134	27
✅ nitro-stable-quickjs	134	27
✅ nuxt-stable-node	134	27
✅ nuxt-stable-quickjs	134	27
✅ sveltekit-stable-node	153	8
✅ sveltekit-stable-quickjs	153	8
✅ tanstack-start-node	134	27
✅ tanstack-start-quickjs	134	27
✅ vite-stable-node	134	27
✅ vite-stable-quickjs	134	27

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack-node	160	0	1
✅ nextjs-turbopack-quickjs	160	0	1

✅ 🌐 Cross-language Conformance

App	Passed	Failed	Skipped
✅ python	68	0	74

✅ vercel-http-transport

App	Passed	Skipped
✅ example	133	28
✅ express	133	28
✅ hono	133	28
✅ nextjs-turbopack	158	3
✅ nitro	133	28
✅ vite	133	28

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

✅ vercel-ws-transport

App	Passed	Skipped
✅ example	133	28
✅ express	133	28
✅ nextjs-turbopack	158	3
✅ vite	133	28

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github-actions · 2026-09-10T19:56:42Z

Sim World

Simulated world deterministic testing for races. Traces

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

fence=per-spec

scenario	outcome	events	virt	replay
✅ `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
✅ `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 · 2026-09-10T19:57:29Z

Framework	Flow route	Step reg.	Framework output
hono	201.6 KiB (±0)	43.8 KiB (+1.4 KiB)	1.80 MiB (+9.4 KiB)
nextjs-turbopack	207.8 KiB (±0)	439 B (±0)	778.3 KiB (-1.1 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.

2a7fc1b · run

Co-Authored-By: shalabhc <shalabh.chaturvedi@vercel.com>

[WIP] Add inline run-affinity actor World POC

3fa4888

Co-Authored-By: shalabhc <shalabh.chaturvedi@vercel.com>

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Comment thread packages/world/src/actor-projection.ts Resolved

[core] Fix actor POC types and format the implementation

760ba66

Co-Authored-By: shalabhc <shalabh.chaturvedi@vercel.com>

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shalabhc changed the title ~~WIP: inline run-affinity actor World POC~~ WIP: add standalone World execution API and Postgres implementation Sep 11, 2026

[world-postgres] Make execution World standalone

2a7fc1b

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komly mentioned this pull request Sep 11, 2026

world-postgres: startup recovery re-enqueues runs a LIVE peer process is executing — concurrent replay corrupts the event log #3758

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WIP: add standalone World execution API and Postgres implementation - #4081

WIP: add standalone World execution API and Postgres implementation#4081
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Sim World

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