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feat(core): record replay lineage in run executionContext - #2872

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Jul 10, 2026
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feat(core): record replay lineage in run executionContext#2872
karthikscale3 merged 7 commits into
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c+ms/replay-lineage-execution-context

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@mitul-s

@mitul-smitul-s commented Jul 10, 2026

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Summary

Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.

  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.

executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.

Motivation

This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.

Changes

  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).

Testing

  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.

Notes

  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).

Made with Cursor

@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
@mitul-s
mitul-s requested review from a team and ijjk as code ownersJuly 10, 2026 15:13
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🦋 Changeset detected

Latest commit: 97349f5

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

This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch

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🧪 E2E Test Results

✅ All tests passed

Summary

PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415

Details by Category

✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack15300
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable128025
✅ e2e-local-dev-tanstack-start-128025
✅ e2e-local-postgres-nest-stable128025
✅ e2e-local-postgres-tanstack-start-128025
✅ e2e-local-prod-nest-stable128025
✅ e2e-local-prod-tanstack-start-128025
✅ e2e-vercel-prod-tanstack-start126027

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📊 Workflow Benchmarks

commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs

Backend: vercel · app: nextjs-turbopack

MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)

1f516ed

Fri, 10 Jul 2026 18:02:02 GMT · run logs

vercel / nextjs-turbopack

MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30

df8ab47

Fri, 10 Jul 2026 15:34:19 GMT · run logs

vercel / nextjs-turbopack

MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30

Avg deltas compare against the most recent benchmark run on main at the time of this run.

Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)

Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges

🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120

TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.

mitul-s
mitul-s commented Jul 10, 2026
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Signed-off-by: Mitul Shah <mitulxshah@gmail.com>
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@VaguelySeriousVaguelySeriousVaguelySerious approved these changes
@karthikscale3karthikscale3karthikscale3 approved these changes
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feat(core): record replay lineage in run executionContext by mitul-s · Pull Request #2872 · vercel/workflow · GitHub
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feat(core): record replay lineage in run executionContext - #2872
Merged
karthikscale3 merged 7 commits into
mainfrom 
c+ms/replay-lineage-execution-context
Jul 10, 2026
Merged
feat(core): record replay lineage in run executionContext#2872
karthikscale3 merged 7 commits into
mainfrom 
c+ms/replay-lineage-execution-context
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@mitul-s
@mitul-smitul-s
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Jul 10, 2026

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Summary
Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.
  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.
executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.
Motivation
This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.
Changes
  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).
Testing
  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.
Notes
  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).
Made with Cursor
@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
@mitul-s
mitul-s
requested review from
a team and ijjk
as code ownersJuly 10, 2026 15:13
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-astro-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-express-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-fastify-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-hono-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-nitro-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-nuxt-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-sveltekit-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-tanstack-start-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-vite-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workflow-docsReadyReadyPreview, Comment, Open in v0Jul 10, 2026 8:25pm
workflow-swc-playgroundReadyReadyPreview, CommentJul 10, 2026 8:25pm
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🦋 Changeset detected
Latest commit: 97349f5
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
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
✅ All tests passed
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack15300
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable128025
✅ e2e-local-dev-tanstack-start-128025
✅ e2e-local-postgres-nest-stable128025
✅ e2e-local-postgres-tanstack-start-128025
✅ e2e-local-prod-nest-stable128025
✅ e2e-local-prod-tanstack-start-128025
✅ e2e-vercel-prod-tanstack-start126027
📋 View full workflow run
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📊 Workflow Benchmarks
commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)
1f516ed
Fri, 10 Jul 2026 18:02:02 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30
df8ab47
Fri, 10 Jul 2026 15:34:19 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30
Avg deltas compare against the most recent benchmark run on main at the time of this run.
Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)
Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges
🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120
TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.
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feat(core): record replay lineage in run executionContext by mitul-s · Pull Request #2872 · vercel/workflow · GitHub
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feat(core): record replay lineage in run executionContext - #2872
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feat(core): record replay lineage in run executionContext#2872
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Summary
Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.
  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.
executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.
Motivation
This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.
Changes
  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).
Testing
  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.
Notes
  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).
Made with Cursor
@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
@mitul-s
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
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🦋 Changeset detected
Latest commit: 97349f5
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
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🧪 E2E Test Results
✅ All tests passed
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack15300
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable128025
✅ e2e-local-dev-tanstack-start-128025
✅ e2e-local-postgres-nest-stable128025
✅ e2e-local-postgres-tanstack-start-128025
✅ e2e-local-prod-nest-stable128025
✅ e2e-local-prod-tanstack-start-128025
✅ e2e-vercel-prod-tanstack-start126027
📋 View full workflow run
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📊 Workflow Benchmarks
commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)
1f516ed
Fri, 10 Jul 2026 18:02:02 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30
df8ab47
Fri, 10 Jul 2026 15:34:19 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30
Avg deltas compare against the most recent benchmark run on main at the time of this run.
Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)
Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges
🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120
TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.
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feat(core): record replay lineage in run executionContext by mitul-s · Pull Request #2872 · vercel/workflow · GitHub
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feat(core): record replay lineage in run executionContext - #2872
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c+ms/replay-lineage-execution-context
Jul 10, 2026
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feat(core): record replay lineage in run executionContext#2872
karthikscale3 merged 7 commits into
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Summary
Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.
  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.
executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.
Motivation
This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.
Changes
  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).
Testing
  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.
Notes
  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).
Made with Cursor
@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
@mitul-s
mitul-s
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a team and ijjk
as code ownersJuly 10, 2026 15:13
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🦋 Changeset detected
Latest commit: 97349f5
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
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🧪 E2E Test Results
✅ All tests passed
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
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✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
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✅ express-stable128025
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✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
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✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
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📊 Workflow Benchmarks
commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)
1f516ed
Fri, 10 Jul 2026 18:02:02 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30
df8ab47
Fri, 10 Jul 2026 15:34:19 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30
Avg deltas compare against the most recent benchmark run on main at the time of this run.
Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)
Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges
🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120
TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.
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feat(core): record replay lineage in run executionContext by mitul-s · Pull Request #2872 · vercel/workflow · GitHub
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feat(core): record replay lineage in run executionContext - #2872
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c+ms/replay-lineage-execution-context
Jul 10, 2026
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feat(core): record replay lineage in run executionContext#2872
karthikscale3 merged 7 commits into
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c+ms/replay-lineage-execution-context
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Summary
Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.
  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.
executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.
Motivation
This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.
Changes
  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).
Testing
  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.
Notes
  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).
Made with Cursor
@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
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🦋 Changeset detected
Latest commit: 97349f5
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
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
✅ All tests passed
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack15300
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable128025
✅ e2e-local-dev-tanstack-start-128025
✅ e2e-local-postgres-nest-stable128025
✅ e2e-local-postgres-tanstack-start-128025
✅ e2e-local-prod-nest-stable128025
✅ e2e-local-prod-tanstack-start-128025
✅ e2e-vercel-prod-tanstack-start126027
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📊 Workflow Benchmarks
commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)
1f516ed
Fri, 10 Jul 2026 18:02:02 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30
df8ab47
Fri, 10 Jul 2026 15:34:19 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30
Avg deltas compare against the most recent benchmark run on main at the time of this run.
Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)
Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges
🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120
TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.
mitul-s
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Comment threadpackages/core/src/runtime/runs.ts
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Signed-off-by: Mitul Shah <mitulxshah@gmail.com>
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat(core): record replay lineage in run executionContext by mitul-s · Pull Request #2872 · vercel/workflow · GitHub
Skip to content
feat(core): record replay lineage in run executionContext - #2872
Merged
karthikscale3 merged 7 commits into
mainfrom 
c+ms/replay-lineage-execution-context
Jul 10, 2026
Merged
feat(core): record replay lineage in run executionContext#2872
karthikscale3 merged 7 commits into
mainfrom 
c+ms/replay-lineage-execution-context
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Summary
Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.
  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.
executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.
Motivation
This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.
Changes
  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).
Testing
  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.
Notes
  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).
Made with Cursor
@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
@mitul-s
mitul-s
requested review from
a team and ijjk
as code ownersJuly 10, 2026 15:13
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-astro-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-express-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-fastify-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-hono-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-nitro-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-nuxt-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-sveltekit-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-tanstack-start-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-vite-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workflow-docsReadyReadyPreview, Comment, Open in v0Jul 10, 2026 8:25pm
workflow-swc-playgroundReadyReadyPreview, CommentJul 10, 2026 8:25pm
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🦋 Changeset detected
Latest commit: 97349f5
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
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
✅ All tests passed
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack15300
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable128025
✅ e2e-local-dev-tanstack-start-128025
✅ e2e-local-postgres-nest-stable128025
✅ e2e-local-postgres-tanstack-start-128025
✅ e2e-local-prod-nest-stable128025
✅ e2e-local-prod-tanstack-start-128025
✅ e2e-vercel-prod-tanstack-start126027
📋 View full workflow run
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📊 Workflow Benchmarks
commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)
1f516ed
Fri, 10 Jul 2026 18:02:02 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30
df8ab47
Fri, 10 Jul 2026 15:34:19 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30
Avg deltas compare against the most recent benchmark run on main at the time of this run.
Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)
Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges
🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120
TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.
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mitul-s
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Jul 10, 2026
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Comment threadpackages/core/src/runtime/runs.ts
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feat(core): record replay lineage in run executionContext by mitul-s · Pull Request #2872 · vercel/workflow · GitHub
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feat(core): record replay lineage in run executionContext - #2872
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c+ms/replay-lineage-execution-context
Jul 10, 2026
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feat(core): record replay lineage in run executionContext#2872
karthikscale3 merged 7 commits into
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c+ms/replay-lineage-execution-context
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Summary
Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.
  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.
executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.
Motivation
This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.
Changes
  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).
Testing
  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.
Notes
  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).
Made with Cursor
@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
@mitul-s
mitul-s
requested review from
a team and ijjk
as code ownersJuly 10, 2026 15:13
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The latest updates on your projects. Learn more about Vercel for GitHub.
ProjectDeploymentActionsUpdated (UTC)
example-nextjs-workflow-turbopackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-nextjs-workflow-webpackReadyReadyPreview, CommentJul 10, 2026 8:25pm
example-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-astro-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-express-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-fastify-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-hono-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-nitro-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-nuxt-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-sveltekit-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-tanstack-start-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workbench-vite-workflowReadyReadyPreview, CommentJul 10, 2026 8:25pm
workflow-docsReadyReadyPreview, Comment, Open in v0Jul 10, 2026 8:25pm
workflow-swc-playgroundReadyReadyPreview, CommentJul 10, 2026 8:25pm
workflow-tarballsReadyReadyPreview, CommentJul 10, 2026 8:25pm
workflow-webReadyReadyPreview, CommentJul 10, 2026 8:25pm
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🦋 Changeset detected
Latest commit: 97349f5
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
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
✅ All tests passed
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack15300
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable128025
✅ e2e-local-dev-tanstack-start-128025
✅ e2e-local-postgres-nest-stable128025
✅ e2e-local-postgres-tanstack-start-128025
✅ e2e-local-prod-nest-stable128025
✅ e2e-local-prod-tanstack-start-128025
✅ e2e-vercel-prod-tanstack-start126027
📋 View full workflow run
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📊 Workflow Benchmarks
commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)
1f516ed
Fri, 10 Jul 2026 18:02:02 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30
df8ab47
Fri, 10 Jul 2026 15:34:19 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30
Avg deltas compare against the most recent benchmark run on main at the time of this run.
Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)
Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges
🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120
TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.
mitul-s
mitul-s
commented
Jul 10, 2026
View reviewed changes
Comment threadpackages/core/src/runtime/runs.ts
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Apply suggestion from@mitul-s
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Signed-off-by: Mitul Shah <mitulxshah@gmail.com>
@mitul-s
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enabled auto-merge (squash)
July 10, 2026 19:51
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mentioned this pull request
Jul 10, 2026
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mentioned this pull request
Aug 4, 2026
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@VaguelySeriousVaguelySeriousVaguelySerious approved these changes
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feat(core): record replay lineage in run executionContext by mitul-s · Pull Request #2872 · vercel/workflow · GitHub
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feat(core): record replay lineage in run executionContext - #2872
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feat(core): record replay lineage in run executionContext#2872
karthikscale3 merged 7 commits into
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c+ms/replay-lineage-execution-context
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Jul 10, 2026

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Summary
Replays currently start a brand-new run with no link back to the run they were replayed from, so tooling can't tell that a run originated as a replay. This adds that link.
  • recreateRunFromExisting now stamps the source run id into the new run's executionContext as replayedFromRunId.
  • start gains an optional replayedFromRunId option (used by recreateRunFromExisting; rarely needed directly) that is merged into the run's executionContext on both the run_created event and the resilient-start queue input.
executionContext is the right home per the repo's own architecture notes ("flexible object that can store arbitrary data without schema changes… flows through all worlds"), and it's already returned on WorkflowRunWithoutData from runs.list, so consumers can read it without resolving full run data.
Motivation
This is the SDK half of a dashboard feature in vercel/front that shows a "Replay of <run id>" indicator next to the workflow name in the all-runs table (mirroring the deployment list's "Redeploy of …"). That PR already reads executionContext.replayedFromRunId; this change is what populates it. Until this lands, the indicator is a no-op because the origin is never recorded.
Changes
  • packages/core/src/runtime/start.ts — add replayedFromRunId? to StartOptionsBase; include it in executionContext when set.
  • packages/core/src/runtime/runs.ts — pass replayedFromRunId: runId from recreateRunFromExisting into start.
  • Tests: start records/omits the key correctly; recreateRunFromExisting forwards the source run id.
  • Changeset (minor, @workflow/core).
Testing
  • pnpm -F @workflow/core vitest run src/runtime/runs.test.ts src/runtime/start.test.ts → 50 passed (incl. 3 new).
  • pnpm -F @workflow/core typecheck → clean.
Notes
  • Observability hydration (hydrateResourceIO) strips executionContext before UI display in this repo's own dashboard; the vercel/front runs list reads world.runs.list directly and is unaffected. If the workflow-repo dashboard should also show this, the value would need to be extracted before stripping (follow-up).
Made with Cursor
@mitul-s@cursoragent
feat(core): record replay lineage in run executionContext
df8ab47
recreateRunFromExisting now stamps the source run id into the new run's
executionContext as `replayedFromRunId`, and `start` accepts a matching
option. This lets tooling (e.g. the dashboard runs list) surface a run as
a replay and link back to the run it was replayed from — previously a
replay started a brand-new run with no link to its origin.
Co-authored-by: Cursor <cursoragent@cursor.com>
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🦋 Changeset detected
Latest commit: 97349f5
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 16 packages
NameType
@workflow/coreMinor
@workflow/buildersPatch
@workflow/cliPatch
@workflow/nextPatch
@workflow/nitroPatch
@workflow/vitestPatch
@workflow/web-sharedPatch
@workflow/webPatch
workflowMinor
@workflow/world-testingPatch
@workflow/astroPatch
@workflow/nestPatch
@workflow/nuxtPatch
@workflow/rollupPatch
@workflow/sveltekitPatch
@workflow/vitePatch
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
✅ All tests passed
Summary
PassedFailedSkippedTotal
✅ ▲ Vercel Production145302301683
✅ 💻 Local Development161702191836
✅ 📦 Local Production161702191836
✅ 🐘 Local Postgres161702191836
✅ 🪟 Windows15300153
✅ 📋 Other89401771071
Total7351010648415
Details by Category
✅ ▲ Vercel Production
AppPassedFailedSkipped
✅ astro126027
✅ example126027
✅ express126027
✅ fastify126027
✅ hono126027
✅ nextjs-turbopack15003
✅ nextjs-webpack15003
✅ nitro126027
✅ nuxt126027
✅ sveltekit14508
✅ vite126027
✅ 💻 Local Development
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 📦 Local Production
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🐘 Local Postgres
AppPassedFailedSkipped
✅ astro-stable128025
✅ express-stable128025
✅ fastify-stable128025
✅ hono-stable128025
✅ nextjs-turbopack-canary134019
✅ nextjs-turbopack-stable15300
✅ nextjs-webpack-canary134019
✅ nextjs-webpack-stable15300
✅ nitro-stable128025
✅ nuxt-stable128025
✅ sveltekit-stable14706
✅ vite-stable128025
✅ 🪟 Windows
AppPassedFailedSkipped
✅ nextjs-turbopack15300
✅ 📋 Other
AppPassedFailedSkipped
✅ e2e-local-dev-nest-stable128025
✅ e2e-local-dev-tanstack-start-128025
✅ e2e-local-postgres-nest-stable128025
✅ e2e-local-postgres-tanstack-start-128025
✅ e2e-local-prod-nest-stable128025
✅ e2e-local-prod-tanstack-start-128025
✅ e2e-vercel-prod-tanstack-start126027
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📊 Workflow Benchmarks
commit 97349f5 · Fri, 10 Jul 2026 20:46:17 GMT · run logs
Backend: vercel · app: nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1203 (+3.5%)1615 🔴1722 🔴2280 🔴30
TTFShook + stream1401 (+11%)1892 🔴1954 🔴1996 🔴30
STSO1020 steps (1-20)305 (+21%)334 🔴351 🔴818 🔴19
STSO1020 steps (101-120)452 (-7.5%)492 🔴654 🔴698 🔴19
STSO1020 steps (1001-1020)854 (-1.1%)886 🔴1015 🔴1044 🔴19
WOstream1203 (+3.5%)16151722228030
WOhook + stream1401 (+11%)18921954199630
SLstream5004 (+1.2%)5631 🔴5819 🔴6829 🔴30
SLhook + stream4669 (-5.1%)5463 🔴5615 🔴6387 🔴30
📜 Previous results (2)
1f516ed
Fri, 10 Jul 2026 18:02:02 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1424 (-1.5%)1779 🔴1828 🔴2055 🔴30
TTFShook + stream1666 (-7.8%)2035 🔴2085 🔴2230 🔴30
STSO1020 steps (1-20)320 (+3.9%)335 🔴358 🔴744 🔴19
STSO1020 steps (101-120)467 (+4.3%)527 🔴588 🔴645 🔴19
STSO1020 steps (1001-1020)889 (±0%)918 🔴1035 🔴1302 🔴19
WOstream1424 (-1.5%)17791828205530
WOhook + stream1666 (-7.8%)20352085223030
SLstream4387 (-11%)4918 🔴5673 🔴6060 🔴30
SLhook + stream4851 (±0%)5445 🔴5642 🔴5887 🔴30
df8ab47
Fri, 10 Jul 2026 15:34:19 GMT · run logs
vercel / nextjs-turbopack
MetricScenarioAvg (ms)P75 (ms)P90 (ms)P99 (ms)Samples
TTFSstream1431 (+22%)1775 🔴1868 🔴2274 🔴30
TTFShook + stream1844 (+34%)2056 🔴2158 🔴2259 🔴30
STSO1020 steps (1-20)301 (+11%)320 🔴454 🔴548 🔴19
STSO1020 steps (101-120)474 (+14%)509 🔴604 🔴918 🔴19
STSO1020 steps (1001-1020)915 (-15%)927 🔴1068 🔴1254 🔴19
WOstream1431 (+22%)17751868227430
WOhook + stream1844 (+34%)20562158225930
SLstream4562 (-7.4%)4850 🔴5765 🔴5899 🔴30
SLhook + stream4678 (-6.9%)4628 🔴5502 🔴5748 🔴30
Avg deltas compare against the most recent benchmark run on main at the time of this run.
Metrics — TTFS: time to first step body execution · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (time outside step bodies, client start → last step body exit) · SL: stream latency (first chunk write → visible to the reader)
Scenarios — stream: one step that streams chunks back to the client; no hooks, so the run stays in turbo mode · hook + stream: registers a hook before the same streaming step, which exits turbo mode · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges
🟢/🔴 mark percentiles within/above target. Targets (p75/p90/p99, ms) — TTFS 200/300/600 · SL 50/60/125 · STSO (1-20) 20/30/60 · STSO (101-120) 30/45/90 · STSO (1001-1020) 40/60/120
TTFS/WO compare client vs deployment clocks and SL compares the step runner’s clock vs the client’s (NTP-synced in CI). WO ends at the last step body exit, the closest observable proxy for the final step-completion request.
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Signed-off-by: Mitul Shah <mitulxshah@gmail.com>
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@VaguelySeriousVaguelySeriousVaguelySerious approved these changes
@karthikscale3karthikscale3karthikscale3 approved these changes
@ijjkijjkAwaiting requested review from ijjk

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