[core] Gate dynamic workflows on capabilities.dynamicWorkflowCode

[VaguelySerious]

Follow-up to #2062. Replaces World.getBackendCapabilities() and world-vercel's GET /v2/capabilities probe with a static capabilities.dynamicWorkflowCode flag, the same way other World features are declared.

• start() refuses a dynamic start when the World doesn't declare capabilities.dynamicWorkflowCode, before any key lookup, upload, run creation, or queue message.
• world-vercel, world-local and world-postgres declare it. local and postgres still don't implement uploadDynamicWorkflowCode, so their code is always sent inline on run_created.
• Removes BackendCapabilities, World.getBackendCapabilities, and world-vercel's createGetBackendCapabilities export.
• On Vercel, a project that doesn't have dynamic-source storage enabled now fails at the run_created write (400) instead of at a pre-start probe. The dynamic e2e suite skips on that message the same way it used to skip on the probe result.

Trade-off: run_created and the queue publish run in parallel, so when the backend refuses the create, the queue message is already out. Its consumer's resilient run_started carries the same code and gets the same refusal.

Docs: dynamic-workflows World support section, building-a-world capability list, upgrading-to-v5 capability table.

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 114d74e

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

This PR includes changesets to release 21 packages

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

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

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

[vercel]

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

Project	Deployment	Actions	Updated
example-nextjs-workflow-turbopack	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
example-nextjs-workflow-webpack	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
example-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-astro-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-express-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-fastify-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-hono-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-nestjs-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-nitro-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-nuxt-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-python-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-sveltekit-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-tanstack-start-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workbench-vite-workflow	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workflow-docs	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workflow-swc-playground	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workflow-tarballs	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC
workflow-web	Ready	Preview, v0	Sep 29, 2026 4:55pm UTC

[github-actions]

📊 Workflow Benchmarks

commit 114d74e · Tue, 29 Sep 2026 17:18:19 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	378 (-77%) 💚	2519 🔴 (+28%) 🔻	2916 🔴 (+29%) 🔻	3673 🔴 (+36%) 🔻	30
TTFS	stream	341 (-81%) 💚	2477 🔴 (+29%) 🔻	2515 🔴 (+29%) 🔻	2959 🔴 (+49%) 🔻	30
TTFS	hook + stream	722 (-0.6%)	2913 🔴 (+30%) 🔻	2995 🔴 (+32%) 🔻	3234 🔴 (+25%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	613 (+5.9%)	882 (+1.8%)	978 (-11%)	3098 (+34%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	2216 (+1.4%)	5855 (+13%)	6178 (-5.6%)	10925 (+35%) 🔻	10
STSO	1020 steps (inline)	127 (+5.0%)	161 (+8.8%)	179 (+11%)	275 (+21%) 🔻	1019
WO	1020 steps	160077 (+7.6%)	160077 (+7.6%)	160077 (+7.6%)	160077 (+7.6%)	1
CRTT	first chunk (pooled)	84 (+31%) 🔻	111 (-1.8%)	132 (-2.2%)	144 (+5.1%)	28

Streams

Scenario	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	98.5 (+15%)	154 (-7%)	213 (-12%)	579 (+38%)	119 (-25%)	10
size sweep (100/s, 160B-12KB)	103 (+27%)	173 (-1%)	214 (-38%)	434 (-29%)	139 (-43%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	128 (+7%)	160 (+8%)	199 (+9%)	889 (+226%)	225 (+13%)	3
replay eve-gpt-5.6-sol-2000t (1x)	119 (+18%)	163 (+8%)	192 (-7%)	292 (-53%)	266 (-32%)	2
replay eve-gpt-5.6-sol-2000t (2x)	101 (+4%)	195 (+6%)	254 (+6%)	382 (-11%)	193 (-42%)	3

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

1020 steps (inline)

Cumulative STSO time: main 148430ms → this run 159723ms (Δ +11293ms, +8%)

100-150 ms  █████████████┃██████████  main 797  this 476  -321
150-200 ms  ██████░░░░░░░░┃           main 203  this 498  +295
200-250 ms  ┃                         main  13  this  32   +19
250-300 ms  ┃                         main   3  this   7    +4
300-350 ms  ┃                         main   3  this   5    +2
350-400 ms  ┃                         main   0  this   1    +1

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

variant  RTT 1ms→5s+             avg         p50         p90          p99     n
control  ······▂█▁▁···   134.7 (+1%)   126 (+4%)  213 (-12%)   579 (+38%)  3000
sweep    ······▂█▁····  140.7 (-11%)   129 (+3%)  214 (-38%)   434 (-29%)  3000
gw 1x    ······▂█▁▁▁··  145.3 (+13%)  134 (+10%)   199 (+9%)  889 (+226%)  5295
eve 1x   ······▂█▁····  140.9 (+10%)  134 (+20%)   192 (-7%)   292 (-53%)  5186
eve 2x   ······▁█▃····   158.1 (+3%)   147 (+6%)   254 (+6%)   382 (-11%)  7779

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

control  ▅▂▄▂▅█▄▄▂▁  121–156ms
sweep    ▃▃█▂▃▃▆▁▃▄  127–164ms
gw 1x    ▄▄█▆▂▂▂▂▂▁  124–188ms
eve 1x   ▂▄█▅▂▁▄▇▂▂  134–152ms
eve 2x   ▁▁▁▃▁▃▆█▅▄  132–212ms

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

sweep  █▅▄▆▁▂▅  140–142ms

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

control  █▁▆▄█▅▆▄▇▁  35–43ms
sweep    ▁█▅▄▅▄▆▃▇▃  47–68ms
gw 1x    ▆▆█▂▄▄▂▃▂▁  35–51ms
eve 1x   ▇█▃▄▁▅█▁▄█  26–30ms
eve 2x   ▇▆▁▃▅▃▃▁▆█  20–30ms

ℹ️ Metric definitions & methodology

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

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

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

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

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

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

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

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

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

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

[github-actions]

🧪 E2E Test Results

✅ All tests passed

⚠️ Flaky E2E Tests (passed on retry)

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

• hookDisposeTestWorkflow - hook token reuse after explicit disposal while workflow still running (nuxt · local-dev / local / node / stable)

🛠 Infra Events (absorbed by the harness)

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

• run-pickup-stall · runs app-generated source against a registered step (tanstack-start) · at 16:56:43Z · abandoned wrun_01M3Q1H9JDTW9T92810DPKW28K
• cold-start-warmup · suite warmup (tanstack-start) · at 16:56:50Z · abandoned wrun_01M3Q1H9JE78QSQP7JCS30GQQ2
• run-pickup-stall · hookCleanupTestWorkflow - hook token reuse after workflow completion (nextjs-webpack) · at 17:02:00Z · abandoned wrun_01M3Q1TZDM8Y6ZR72WWDR7DSNB
• run-pickup-stall · hookGetConflictWorkflow - awaiting hook.getConflict() registers hook without payload (nextjs-webpack) · at 17:02:11Z · abandoned wrun_01M3Q1VAJZWG8E5KH59JDY0MBK
• run-pickup-stall · 'hookGetConflictWithPriorStepWorkflow' - hook.getConflict() does not block step execution (nextjs-webpack) · at 17:02:11Z · abandoned wrun_01M3Q1VAMZ54K25V8VES7CD8M9
• run-pickup-stall · pathsAliasWorkflow - TypeScript path aliases resolve correctly (nextjs-webpack) · at 17:03:26Z · abandoned wrun_01M3Q1XK5FHCM0WWBEVEXBVYAV

E2E Test Summary

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	3904	0	875	4779
✅ 💻 Local Development	4406	0	550	4956
✅ 📦 Local Production	4406	0	550	4956
✅ 🐘 Local Postgres	4406	0	550	4956
✅ 🪟 Windows	342	0	12	354
✅ 🌐 Cross-language Conformance	68	0	84	152
✅ dynamic-runs	0	0	0	0
✅ vercel-http-transport	879	0	183	1062
✅ vercel-multi-region	27	0	0	27
✅ vercel-ws-transport	595	0	113	708
Total	19033	0	2917	21950

Details by Category

✅ ▲ Vercel Production

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

✅ 💻 Local Development

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

✅ 📦 Local Production

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

✅ 🐘 Local Postgres

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

✅ 🪟 Windows

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

✅ 🌐 Cross-language Conformance

App	Passed	Failed	Skipped
✅ python	68	0	84

✅ dynamic-runs

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

✅ vercel-http-transport

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

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

✅ vercel-ws-transport

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

---

📋 View full workflow run

[alangenfeld]

thanks for catching this

[github-actions]

Sim World

Simulated world deterministic testing for races. Traces

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

fence=per-spec

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

Full trace: world-sim.txt

[github-actions]

Framework	Flow route	Step reg.	Framework output
hono	265.9 KiB (±0)	97.2 KiB (-33 B)	1.98 MiB (-352 B)
nextjs-turbopack	273.3 KiB (±0)	426 B (±0)	978.9 KiB (-242 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.

114d74e · run

[github-actions]

No backport to stable for 9d72807 (AI decision).

This is an API refactor of the dynamic-workflows surface — it replaces World.getBackendCapabilities() and world-vercel's /v2/capabilities probe with a new static capabilities.dynamicWorkflowCode flag and removes the BackendCapabilities type and createGetBackendCapabilities export — not a fix for a user-visible defect. It also builds on machinery that does not exist on stable: git show origin/stable:packages/world/src/interfaces.ts has no getBackendCapabilities, and packages/world-vercel/src/backend-capabilities.ts is absent there. Adding a new World capability flag plus a breaking removal of existing World API is exactly the kind of change a maintenance line should not take.

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

9d72807c07ad07e63c88eeb566d2423c873f982a