vercel/workflow

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Workflow SDK: Build durable, reliable, and observable apps and AI Agents in TypeScript

Stars: 2.4k
Forks: 365
Open beginner issues: 6
Indexed issues: 116
Avg merge: 2d 7h
Merged PRs (30d): 160

Dominant language: TypeScript
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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115 open issues indexed

POST /.well-known/workflow/v1/flow 500s with MessageNotAvailableError Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

vercel/workflow#4269 · Opened Sep 20, 2026
Hook.then enrols a one-shot FIFO awaiter, so a hook raced against sleep() in a loop delivers its payload to an iteration that already lost Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

vercel/workflow#4264 · Opened Sep 19, 2026
Cross-deployment start() stamps the starter's spec version, not the executing deployment's Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vercel/workflow#4251 · Opened Sep 18, 2026
world-postgres 4.3.x (latest): close() can resolve while a job is still running — fixed on main, not on the 4.x line Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

vercel/workflow#4244 · Opened Sep 18, 2026
Support replay-derived step arguments without persisting full inputs Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

vercel/workflow#4238 · Opened Sep 18, 2026
No per-run hold: an unrunnable parked run kills the process via an out-of-band `ReplayDivergenceError` (world-postgres 4.3.4 / core 4.8.4) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vercel/workflow#4231 · Opened Sep 17, 2026
world-postgres: complete the wait row and its wait_completed event atomically Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

vercel/workflow#4210 · Opened Sep 16, 2026
world-local write() does not retry a transient Windows EPERM from its existence probe Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

vercel/workflow#4203 · Opened Sep 16, 2026
Postgres World permits concurrent ownership of the same hook token Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#4173 · 1 reaction · Opened Sep 15, 2026
Create GitHub Release and Slack still key off `published == 'true'`, so they can announce a half-shipped release that is not on npm yet Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

vercel/workflow#4148 · 1 comment · Opened Sep 13, 2026
world-postgres: maxAttempts is hardcoded to 3, so the retry budget cannot be tuned Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

vercel/workflow#3994 · Opened Sep 7, 2026
world-postgres: crash recovery runs only at startup, so a stranded run waits for a deploy Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

vercel/workflow#3993 · 1 comment · Opened Sep 7, 2026
world-postgres: step jobs are permanently retired by lost workers, not by failures Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

vercel/workflow#3992 · 1 comment · Opened Sep 7, 2026
world-postgres: a producer-only World — enqueue without a runner or startup recovery Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

vercel/workflow#3968 · 1 reaction · Opened Sep 4, 2026
A sleep() that loses a Promise.race can never be closed, and one abandoned timer disables retention and inline deltas for the rest of the run Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

vercel/workflow#3916 · Opened Sep 1, 2026
Detect and recover stranded hook resumes (committed hook_received, no delivered wake) Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

vercel/workflow#3911 · Opened Aug 31, 2026
Local world: 30s undici transport timeout redelivers a live queue message and re-executes an in-flight lazy-inline step Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vercel/workflow#3909 · 1 comment · Opened Aug 31, 2026
[builders] Valid use step directives are missed after raw backticks Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

vercel/workflow#3900 · 1 reaction · Opened Aug 31, 2026
virtual module error with workflow Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

vercel/workflow#3859 · Opened Aug 27, 2026
Hardcoded dep version make it hard to patch vulnerabilities Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#3842 · Opened Aug 27, 2026
world-postgres: startup recovery re-enqueues runs a LIVE peer process is executing — concurrent replay corrupts the event log Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#3758 · 1 comment · Opened Aug 24, 2026
Vercel World queue message waited 39m for first delivery with no redelivery Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

vercel/workflow#3753 · Opened Aug 23, 2026
Replay delivered after a terminal step_failed can exit without any journal write — run stays 'running' forever (observed core 5.0.0-beta.24) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#3747 · Opened Aug 22, 2026
CI cannot catch a WS events transport regression: the lane passes on silent HTTP fallback Open

bug claude-code-assisted ws-transport-test

vercel/workflow#3730 · 1 assignee · Opened Aug 21, 2026
Worlds: move World-scoped state onto the World instance so bundling can't duplicate it Open

claude-code-assisted enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#3729 · 1 comment · Opened Aug 21, 2026
skills/workflow/SKILL.md: two example model IDs are not served by the AI Gateway (anthropic/claude-sonnet-4-5, openai/gpt-4) Open

Difficulty 1/5 Under an hour Newbie friendliness 85/100

vercel/workflow#3653 · Opened Aug 19, 2026
@workflow/builders resolves workflow/internal/builtins without declaring workflow Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

vercel/workflow#3580 · Opened Aug 16, 2026
Managed runs stuck Pending with 'Deployment Unhealthy' since Aug 10 — queue pipeline never delivers to the flow endpoint (reproduced on beta.35 and beta.41) Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

vercel/workflow#3483 · Opened Aug 12, 2026
TTLS: fan-out completion checks are O(N²) event-log loads — return a pending-step count on step-terminal writes Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vercel/workflow#3455 · Opened Aug 11, 2026
[Security Hardening] Unstable express@5.2.1 dependency and leaked test artifacts Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

vercel/workflow#3448 · Opened Aug 11, 2026
`inspect runs --status` filter is ignored by the Vercel backend (`/v2/runs?status=` returns unfiltered results) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

vercel/workflow#3446 · Opened Aug 11, 2026
[core] Parked-chain delivery order across drain windows relies on unpinned safety-net FIFO Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

vercel/workflow#3415 · Opened Aug 10, 2026
Stream writes carry no idempotency key, so a retried step re-appends its chunks Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

vercel/workflow#3387 · 1 comment · Opened Aug 7, 2026
On Vercel, workflow runs never complete or appear in the dashboard: queue handler and run-event reporting fail with "TypeError: fetch failed → Cannot read private member #u" (Next 16 / Turbopack build) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vercel/workflow#3373 · 1 comment · Opened Aug 6, 2026
Decorators in a workspace package fail to parse after 4.5.0 (SWC transform failed: Expression expected) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

vercel/workflow#3356 · Opened Aug 5, 2026
Static Markdown imports fail in Workflow SDK bundles Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

vercel/workflow#3353 · Opened Aug 5, 2026
webhookWorkflow times out on '- stable' local e2e lanes: run stalls in 'running' after all hooks received Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#3317 · 1 comment · Opened Aug 4, 2026
[world-postgres] streams.get(name, startIndex) buffers the entire stream before serving the first byte Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

vercel/workflow#3254 · Opened Jul 31, 2026
[design] event_{seq}: server-assigned per-run sequence as canonical log order, with fenced appends Open

vercel/workflow#3201 · 1 comment · 1 assignee · Opened Jul 29, 2026
createHook: a hook created inside a loop iteration is not resumable from outside; getConflict is a non-idempotent commit Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#3181 · 1 comment · Opened Jul 29, 2026
@workflow/builders 4.1.3: JSON import attribute stripped from bundled deps, breaking all local step execution on Node 22 Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

vercel/workflow#3157 · 2 comments · 1 reaction · Opened Jul 28, 2026
HI Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

vercel/workflow#3156 · Opened Jul 28, 2026
code-transform.mdx §ID Generation omits the package-shipped `name@version` ID form Open

Difficulty 1/5 Under an hour Newbie friendliness 90/100

vercel/workflow#3154 · Opened Jul 28, 2026
Fast discovery misses TypeScript NodeNext `.js` specifiers → silent WorkflowNotRegisteredError Open

vercel/workflow#3151 · 1 comment · 1 assignee · Opened Jul 28, 2026
Owner-aware / single-flight boot recovery for multi-instance self-hosted deployments Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

vercel/workflow#3138 · Opened Jul 27, 2026
world-postgres: startup recovery re-enqueues parked runs and accumulates duplicate jobs Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

vercel/workflow#3119 · 3 comments · Opened Jul 27, 2026
Add an atomic run-tree purge capability for retention workflows Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

vercel/workflow#3114 · Opened Jul 25, 2026
step_created entity row and event are written non-transactionally — a crash between them wedges the run permanently Open

vercel/workflow#3081 · 3 comments · 1 reaction · 1 assignee · Opened Jul 24, 2026
CORRUPTED_EVENT_LOG on @workflow/core 4.6.1 with Promise.race([Promise.all(multiple hooks), sleep()]) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

vercel/workflow#3070 · 1 comment · Opened Jul 23, 2026
`@workflow/builders` sends every esbuild-traversed JavaScript module through SWC during Nitro builds Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

vercel/workflow#3051 · Opened Jul 22, 2026

vercel/workflow

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