Add Python SDK beta documentation page by pranaygp · Pull Request #1775 · vercel/workflow

pranaygp · 2026-04-16T16:18:59Z

Adds a dedicated Python SDK page to the Getting Started section of the docs, as discussed for the launch.

What changed

Created /docs/getting-started/python.mdx with content sourced from vercel.com/docs/workflow/concepts
Added a prominent beta warning callout at the top of the page
Added a "Beta" badge pill to the Python SDK card in the Getting Started index
Created a Python logo SVG icon and exported it from the frameworks component
Positioned the Python SDK card first in the Getting Started grid to highlight it

The page covers core concepts (Workflow, Step, Sleep, Hook, Skew Protection) with Python code samples and links back to the official Vercel docs.

Slack-Thread: https://vercel.slack.com/archives/C0AG7R4PU22/p1776354109663229?thread_ts=1776354109.663229&cid=C0AG7R4PU22 Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

changeset-bot · 2026-04-16T16:19:04Z

⚠️ No Changeset found

Latest commit: ce26467

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

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github-actions · 2026-04-16T16:19:09Z

🧪 E2E Test Results

❌ Some tests failed

Summary

	Passed	Failed	Skipped	Total
❌ ▲ Vercel Production	870	53	67	990
✅ 💻 Local Development	994	0	86	1080
✅ 📦 Local Production	994	0	86	1080
✅ 🐘 Local Postgres	994	0	86	1080
✅ 🪟 Windows	90	0	0	90
❌ 🌍 Community Worlds	133	98	0	231
✅ 📋 Other	252	0	18	270
Total	4327	151	343	4821

❌ Failed Tests

▲ Vercel Production (53 failed)

astro (5 failed):

DurableAgent e2e core tool error recovery
DurableAgent e2e multimodal tool results passes through LanguageModelV3ToolResultOutput from tools
DurableAgent e2e tool approval (GAP) completes but needsApproval is not checked (GAP)
promiseRaceStressTestWorkflow | wrun_01KPBKZ3T56MR22WVY9K344AGD | 🔍 observability
health check (CLI) - workflow health command reports healthy endpoints

example (7 failed):

DurableAgent e2e core single tool call
DurableAgent e2e core multiple sequential tool calls
DurableAgent e2e experimental_onToolCallStart (GAP) completes but callbacks are not called (GAP)
DurableAgent e2e prepareCall (GAP) completes but prepareCall is not applied (GAP)
outputStreamWorkflow positive startIndex (skips first chunk)
outputStreamWorkflow negative startIndex (reads from end)
error handling retry behavior FatalError fails immediately without retries

fastify (3 failed):

DurableAgent e2e experimental_onStart (GAP) completes but callbacks are not called (GAP)
outputStreamWorkflow no startIndex (reads all chunks)
outputStreamWorkflow positive startIndex (skips first chunk)

hono (3 failed):

DurableAgent e2e experimental_onStepStart (GAP) completes but callbacks are not called (GAP)
DurableAgent e2e prepareStep on constructor agent-level prepareStep is called for each LLM step
pathsAliasWorkflow - TypeScript path aliases resolve correctly | wrun_01KPBM6HTZBKJ9D7ZAMFJAK2Z8 | 🔍 observability

nextjs-turbopack (6 failed):

DurableAgent e2e onStepFinish fires constructor + stream callbacks in order with step data
DurableAgent e2e experimental_onToolCallStart (GAP) completes but callbacks are not called (GAP)
DurableAgent e2e prepareCall (GAP) completes but prepareCall is not applied (GAP)
outputStreamWorkflow positive startIndex (skips first chunk)
error handling error propagation step errors cross-file step error preserves message and function names in stack
error handling not registered StepNotRegisteredError fails the step but workflow can catch it

nextjs-webpack (4 failed):

outputStreamWorkflow positive startIndex (skips first chunk)
outputStreamWorkflow negative startIndex (reads from end)
outputStreamInsideStepWorkflow - getWritable() called inside step functions | wrun_01KPBKX5E01950J6R6FCR7RA6B | 🔍 observability
promiseRaceStressTestWorkflow | wrun_01KPBKZ3T56MR22WVY9K344AGD | 🔍 observability

nitro (6 failed):

DurableAgent e2e experimental_onStart (GAP) completes but callbacks are not called (GAP)
DurableAgent e2e experimental_onToolCallStart (GAP) completes but callbacks are not called (GAP)
DurableAgent e2e prepareStep on constructor agent-level prepareStep is called for each LLM step
DurableAgent e2e prepareStep on constructor stream-level prepareStep overrides constructor-level
outputStreamWorkflow no startIndex (reads all chunks)
outputStreamWorkflow negative startIndex (reads from end)

nuxt (7 failed):

DurableAgent e2e experimental_onToolCallFinish (GAP) completes but callbacks are not called (GAP)
outputStreamWorkflow no startIndex (reads all chunks)
outputStreamWorkflow positive startIndex (skips first chunk)
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns correct index after stream completes
outputStreamWorkflow - getTailIndex and getChunks getChunks returns same content as reading the stream
outputStreamInsideStepWorkflow - getWritable() called inside step functions | wrun_01KPBKX5E01950J6R6FCR7RA6B | 🔍 observability
error handling catchability FatalError can be caught and detected with FatalError.is()

sveltekit (9 failed):

DurableAgent e2e experimental_onStart (GAP) completes but callbacks are not called (GAP)
DurableAgent e2e experimental_onToolCallStart (GAP) completes but callbacks are not called (GAP)
DurableAgent e2e tool approval (GAP) completes but needsApproval is not checked (GAP)
webhookWorkflow | wrun_01KPBKQAQ6Y3VSPVGC81VYW4CB | 🔍 observability
outputStreamWorkflow positive startIndex (skips first chunk)
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns correct index after stream completes
outputStreamWorkflow - getTailIndex and getChunks getChunks returns same content as reading the stream
fetchWorkflow | wrun_01KPBKZ0KB8JX06S6YXS8M1JPT | 🔍 observability
crossContextSerdeWorkflow - classes defined in step code are deserializable in workflow context | wrun_01KPBM8SQWSASQYH14CT7V6ZBX | 🔍 observability

vite (3 failed):

DurableAgent e2e timeout completes within timeout
outputStreamWorkflow no startIndex (reads all chunks)
outputStreamInsideStepWorkflow - getWritable() called inside step functions | wrun_01KPBKX5E01950J6R6FCR7RA6B | 🔍 observability

🌍 Community Worlds (98 failed)

mongodb (15 failed):

readableStreamWorkflow | wrun_01KPBKPCYR0JFZJ4KTNYMFZG97
hookWorkflow is not resumable via public webhook endpoint | wrun_01KPBKQ1RH3R87HC7BVDHVEJ84
webhookWorkflow | wrun_01KPBKQAQ6Y3VSPVGC81VYW4CB
outputStreamWorkflow no startIndex (reads all chunks)
outputStreamWorkflow positive startIndex (skips first chunk)
outputStreamWorkflow negative startIndex (reads from end)
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns correct index after stream completes
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns -1 before any chunks are written
outputStreamWorkflow - getTailIndex and getChunks getChunks returns same content as reading the stream
outputStreamInsideStepWorkflow - getWritable() called inside step functions | wrun_01KPBKX5E01950J6R6FCR7RA6B
fetchWorkflow | wrun_01KPBKZ0KB8JX06S6YXS8M1JPT
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_01KPBM3BQCNQCWDD9SAJDDS023
health check (queue-based) - workflow and step endpoints respond to health check messages
health check (CLI) - workflow health command reports healthy endpoints
resilient start: addTenWorkflow completes when run_created returns 500 | wrun_01KPBMBKFP0NRNBYQRJEXGMS15

redis (15 failed):

readableStreamWorkflow | wrun_01KPBKPCYR0JFZJ4KTNYMFZG97
hookWorkflow is not resumable via public webhook endpoint | wrun_01KPBKQ1RH3R87HC7BVDHVEJ84
webhookWorkflow | wrun_01KPBKQAQ6Y3VSPVGC81VYW4CB
outputStreamWorkflow no startIndex (reads all chunks)
outputStreamWorkflow positive startIndex (skips first chunk)
outputStreamWorkflow negative startIndex (reads from end)
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns correct index after stream completes
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns -1 before any chunks are written
outputStreamWorkflow - getTailIndex and getChunks getChunks returns same content as reading the stream
outputStreamInsideStepWorkflow - getWritable() called inside step functions | wrun_01KPBKX5E01950J6R6FCR7RA6B
fetchWorkflow | wrun_01KPBKZ0KB8JX06S6YXS8M1JPT
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_01KPBM3BQCNQCWDD9SAJDDS023
health check (queue-based) - workflow and step endpoints respond to health check messages
health check (CLI) - workflow health command reports healthy endpoints
resilient start: addTenWorkflow completes when run_created returns 500 | wrun_01KPBMBKFP0NRNBYQRJEXGMS15

turso (68 failed):

addTenWorkflow | wrun_01KPBKNVYD2VYKHF2J21M247ZV
addTenWorkflow | wrun_01KPBKNVYD2VYKHF2J21M247ZV
wellKnownAgentWorkflow (.well-known/agent) | wrun_01KPBKNM8JZXMXFM7J7228TJSY
should work with react rendering in step
promiseAllWorkflow | wrun_01KPBKP3BBX7FDYJG98G9TW798
promiseRaceWorkflow | wrun_01KPBKP8D7TABHJQ64SM2S1H4K
promiseAnyWorkflow | wrun_01KPBKPASX14QY3Y3W04K388A7
importedStepOnlyWorkflow | wrun_01KPBKNZ1APEKSDGZCPV8N1MGB
readableStreamWorkflow | wrun_01KPBKPCYR0JFZJ4KTNYMFZG97
hookWorkflow | wrun_01KPBKPPKARZZ9TQWVFAAF1MQT
hookWorkflow is not resumable via public webhook endpoint | wrun_01KPBKQ1RH3R87HC7BVDHVEJ84
webhookWorkflow | wrun_01KPBKQAQ6Y3VSPVGC81VYW4CB
sleepingWorkflow | wrun_01KPBKQQYHBQ8GGS0WFM5EW2QP
parallelSleepWorkflow | wrun_01KPBKR65DEV8CPFQN4SGA5JPV
nullByteWorkflow | wrun_01KPBKRD3ARMPQ8585MHVAYV7H
workflowAndStepMetadataWorkflow | wrun_01KPBKRT5N948FMVMP71DMEPFS
outputStreamWorkflow no startIndex (reads all chunks)
outputStreamWorkflow positive startIndex (skips first chunk)
outputStreamWorkflow negative startIndex (reads from end)
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns correct index after stream completes
outputStreamWorkflow - getTailIndex and getChunks getTailIndex returns -1 before any chunks are written
outputStreamWorkflow - getTailIndex and getChunks getChunks returns same content as reading the stream
outputStreamInsideStepWorkflow - getWritable() called inside step functions | wrun_01KPBKX5E01950J6R6FCR7RA6B
fetchWorkflow | wrun_01KPBKZ0KB8JX06S6YXS8M1JPT
promiseRaceStressTestWorkflow | wrun_01KPBKZ3T56MR22WVY9K344AGD
error handling error propagation workflow errors nested function calls preserve message and stack trace
error handling error propagation workflow errors cross-file imports preserve message and stack trace
error handling error propagation step errors basic step error preserves message and stack trace
error handling error propagation step errors cross-file step error preserves message and function names in stack
error handling retry behavior regular Error retries until success
error handling retry behavior FatalError fails immediately without retries
error handling retry behavior RetryableError respects custom retryAfter delay
error handling retry behavior maxRetries=0 disables retries
error handling catchability FatalError can be caught and detected with FatalError.is()
error handling not registered WorkflowNotRegisteredError fails the run when workflow does not exist
error handling not registered StepNotRegisteredError fails the step but workflow can catch it
error handling not registered StepNotRegisteredError fails the run when not caught in workflow
hookCleanupTestWorkflow - hook token reuse after workflow completion | wrun_01KPBM2Q70DPF84J9T12D7FRA9
concurrent hook token conflict - two workflows cannot use the same hook token simultaneously | wrun_01KPBM3BQCNQCWDD9SAJDDS023
hookDisposeTestWorkflow - hook token reuse after explicit disposal while workflow still running | wrun_01KPBM3ZE50BYA116RG2FXQC9B
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars) | wrun_01KPBM4KJ04PM3DCESZ76EQYHE
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument | wrun_01KPBM4Z3V1W9WA8SG9QR191GH
closureVariableWorkflow - nested step functions with closure variables | wrun_01KPBM54B1Q9C4R5D2KWS8PZKT
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step | wrun_01KPBM56DZFHR6K9KERBSKQK5H
runClassSerializationWorkflow - Run instances serialize across workflow/step boundaries | wrun_01KPBM647YAR7KYE0D2JWNHFBD
health check (queue-based) - workflow and step endpoints respond to health check messages
health check (CLI) - workflow health command reports healthy endpoints
pathsAliasWorkflow - TypeScript path aliases resolve correctly | wrun_01KPBM6HTZBKJ9D7ZAMFJAK2Z8
Calculator.calculate - static workflow method using static step methods from another class | wrun_01KPBM6Q2DRMWCYY9DDZNS6DQQ
AllInOneService.processNumber - static workflow method using sibling static step methods | wrun_01KPBM7ERP71BC3V7TXS1G1EK0
ChainableService.processWithThis - static step methods using this to reference the class | wrun_01KPBM7N1R9BGT1X71EJKPV00J
thisSerializationWorkflow - step function invoked with .call() and .apply() | wrun_01KPBM7YYCVJ5BBHD1C12KGZ6R
customSerializationWorkflow - custom class serialization with WORKFLOW_SERIALIZE/WORKFLOW_DESERIALIZE | wrun_01KPBM85KHAVE5T8TQ6EWWJ6TV
instanceMethodStepWorkflow - instance methods with "use step" directive | wrun_01KPBM8CZXBPEXTJCVA2C11W45
crossContextSerdeWorkflow - classes defined in step code are deserializable in workflow context | wrun_01KPBM8SQWSASQYH14CT7V6ZBX
stepFunctionAsStartArgWorkflow - step function reference passed as start() argument | wrun_01KPBM971RK4N5ENNZWAV0J02V
cancelRun - cancelling a running workflow | wrun_01KPBM9EDSN9EKVEF5JYZ0MCZ3
cancelRun via CLI - cancelling a running workflow | wrun_01KPBM9QX9BPBEE72F404HP5C3
pages router addTenWorkflow via pages router
pages router promiseAllWorkflow via pages router
pages router sleepingWorkflow via pages router
hookWithSleepWorkflow - hook payloads delivered correctly with concurrent sleep | wrun_01KPBMA3C30Z7WP6VFMGYBJ1TB
sleepInLoopWorkflow - sleep inside loop with steps actually delays each iteration | wrun_01KPBMARH8EP899SPBPERB65BA
sleepWithSequentialStepsWorkflow - sequential steps work with concurrent sleep (control) | wrun_01KPBMB496Y2QG007T08PKZ9S3
importMetaUrlWorkflow - import.meta.url is available in step bundles | wrun_01KPBMBE511E5B94PKK1KFCCYT
metadataFromHelperWorkflow - getWorkflowMetadata/getStepMetadata work from module-level helper (#1577) | wrun_01KPBMBHCKKR1MAKA6046SXY5G
resilient start: addTenWorkflow completes when run_created returns 500 | wrun_01KPBMBKFP0NRNBYQRJEXGMS15
getterStepWorkflow - getter functions with "use step" directive | wrun_01KPBMBPPV4S88F0STZ73SD20B

Details by Category

❌ ▲ Vercel Production

App	Passed	Failed	Skipped
❌ astro	78	5	7
❌ example	76	7	7
✅ express	83	0	7
❌ fastify	80	3	7
❌ hono	80	3	7
❌ nextjs-turbopack	82	6	2
❌ nextjs-webpack	84	4	2
❌ nitro	77	6	7
❌ nuxt	76	7	7
❌ sveltekit	74	9	7
❌ vite	80	3	7

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable	84	6
✅ express-stable	84	6
✅ fastify-stable	84	6
✅ hono-stable	84	6
✅ nextjs-turbopack-canary	71	19
✅ nextjs-turbopack-stable	90	0
✅ nextjs-webpack-canary	71	19
✅ nextjs-webpack-stable	90	0
✅ nitro-stable	84	6
✅ nuxt-stable	84	6
✅ sveltekit-stable	84	6
✅ vite-stable	84	6

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable	84	6
✅ express-stable	84	6
✅ fastify-stable	84	6
✅ hono-stable	84	6
✅ nextjs-turbopack-canary	71	19
✅ nextjs-turbopack-stable	90	0
✅ nextjs-webpack-canary	71	19
✅ nextjs-webpack-stable	90	0
✅ nitro-stable	84	6
✅ nuxt-stable	84	6
✅ sveltekit-stable	84	6
✅ vite-stable	84	6

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable	84	6
✅ express-stable	84	6
✅ fastify-stable	84	6
✅ hono-stable	84	6
✅ nextjs-turbopack-canary	71	19
✅ nextjs-turbopack-stable	90	0
✅ nextjs-webpack-canary	71	19
✅ nextjs-webpack-stable	90	0
✅ nitro-stable	84	6
✅ nuxt-stable	84	6
✅ sveltekit-stable	84	6
✅ vite-stable	84	6

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	90	0	0

❌ 🌍 Community Worlds

App	Passed	Failed
✅ mongodb-dev	6	0
❌ mongodb	56	15
✅ redis-dev	6	0
❌ redis	56	15
✅ turso-dev	6	0
❌ turso	3	68

✅ 📋 Other

App	Passed	Skipped
✅ e2e-local-dev-nest-stable	84	6
✅ e2e-local-postgres-nest-stable	84	6
✅ e2e-local-prod-nest-stable	84	6

📋 View full workflow run

❌ Some E2E test jobs failed:

Vercel Prod: failure
Local Dev: success
Local Prod: success
Local Postgres: success
Windows: success

Check the workflow run for details.

github-actions · 2026-04-16T16:19:10Z

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	0.044s (+26.9% 🔺)	1.005s (~)	0.961s	10	1.00x
💻 Local	Nitro	0.046s (+27.2% 🔺)	1.006s (~)	0.961s	10	1.03x
🐘 Postgres	Nitro	0.059s (-2.1%)	1.010s (~)	0.951s	10	1.34x
🐘 Postgres	Express	0.060s (-16.3% 🟢)	1.011s (-0.9%)	0.950s	10	1.36x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	0.288s (+18.9% 🔺)	2.369s (+15.8% 🔺)	2.081s	10	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Express	1.133s (+3.2%)	2.006s (~)	0.873s	10	1.00x
💻 Local	Nitro	1.134s (+3.0%)	2.006s (~)	0.872s	10	1.00x
🐘 Postgres	Nitro	1.142s (~)	2.011s (~)	0.868s	10	1.01x
🐘 Postgres	Express	1.148s (~)	2.012s (~)	0.864s	10	1.01x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	4.610s (+101.7% 🔺)	6.260s (+57.3% 🔺)	1.650s	10	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	10.889s (~)	11.019s (~)	0.130s	3	1.00x
🐘 Postgres	Express	10.918s (-0.6%)	11.021s (-2.9%)	0.103s	3	1.00x
💻 Local	Express	10.960s (+2.9%)	11.023s (~)	0.064s	3	1.01x
💻 Local	Nitro	10.989s (+3.2%)	11.024s (~)	0.034s	3	1.01x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	331.093s (+1712.9% 🔺)	332.815s (+1515.3% 🔺)	1.722s	1	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 25 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.515s (-0.6%)	15.019s (~)	0.504s	4	1.00x
🐘 Postgres	Nitro	14.555s (~)	15.027s (~)	0.472s	4	1.00x
💻 Local	Nitro	15.018s (+5.4% 🔺)	15.531s (+3.3%)	0.513s	4	1.03x
💻 Local	Express	15.122s (+6.2% 🔺)	16.032s (+6.7% 🔺)	0.910s	4	1.04x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	60.606s (+90.5% 🔺)	63.322s (+88.0% 🔺)	2.716s	1	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 50 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	14.022s (-2.2%)	14.451s (-3.8%)	0.429s	7	1.00x
🐘 Postgres	Nitro	14.652s (+5.1% 🔺)	15.364s (+9.6% 🔺)	0.712s	6	1.04x
💻 Local	Nitro	16.489s (+10.2% 🔺)	17.032s (+10.9% 🔺)	0.543s	6	1.18x
💻 Local	Express	17.046s (+14.4% 🔺)	17.533s (+16.7% 🔺)	0.487s	6	1.22x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	83.749s (+54.5% 🔺)	94.706s (+67.8% 🔺)	10.957s	1	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.275s (-1.4%)	2.011s (~)	0.736s	15	1.00x
🐘 Postgres	Nitro	1.289s (+1.9%)	2.010s (~)	0.721s	15	1.01x
💻 Local	Nitro	1.531s (+3.7%)	2.006s (~)	0.475s	15	1.20x
💻 Local	Express	1.544s (+5.8% 🔺)	2.006s (~)	0.462s	15	1.21x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	8.500s (+206.0% 🔺)	10.063s (+130.8% 🔺)	1.563s	5	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	2.332s (-1.0%)	3.010s (~)	0.678s	10	1.00x
🐘 Postgres	Nitro	2.361s (+1.0%)	3.011s (~)	0.650s	10	1.01x
💻 Local	Nitro	2.907s (+13.5% 🔺)	3.454s (+14.8% 🔺)	0.546s	9	1.25x
💻 Local	Express	3.155s (+11.0% 🔺)	3.884s (+25.0% 🔺)	0.730s	8	1.35x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	12.977s (+354.4% 🔺)	14.377s (+215.4% 🔺)	1.400s	5	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

Promise.all with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	3.473s (~)	4.013s (~)	0.540s	8	1.00x
🐘 Postgres	Nitro	3.499s (+1.3%)	4.011s (~)	0.512s	8	1.01x
💻 Local	Nitro	7.469s (+7.5% 🔺)	8.019s (+6.7% 🔺)	0.550s	4	2.15x
💻 Local	Express	9.082s (+28.1% 🔺)	10.023s (+25.0% 🔺)	0.941s	3	2.62x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	5.137s (+48.1% 🔺)	6.737s (+30.8% 🔺)	1.600s	6	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	1.265s (+0.7%)	2.009s (~)	0.745s	15	1.00x
🐘 Postgres	Nitro	1.270s (+0.9%)	2.009s (~)	0.739s	15	1.00x
💻 Local	Nitro	1.566s (+3.3%)	2.006s (~)	0.439s	15	1.24x
💻 Local	Express	1.572s (+6.8% 🔺)	2.006s (~)	0.435s	15	1.24x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	3.541s (+44.3% 🔺)	5.111s (+25.9% 🔺)	1.570s	6	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	2.329s (~)	3.010s (~)	0.681s	10	1.00x
🐘 Postgres	Express	2.346s (~)	3.011s (~)	0.665s	10	1.01x
💻 Local	Nitro	2.889s (+4.4%)	3.008s (-3.3%)	0.119s	10	1.24x
💻 Local	Express	3.353s (+24.3% 🔺)	3.884s (+29.2% 🔺)	0.531s	8	1.44x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	11.131s (+213.0% 🔺)	13.029s (+143.3% 🔺)	1.898s	3	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

Promise.race with 50 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.447s (-1.1%)	4.010s (~)	0.564s	8	1.00x
🐘 Postgres	Express	3.479s (~)	4.013s (~)	0.533s	8	1.01x
💻 Local	Nitro	8.018s (+7.7% 🔺)	8.525s (+6.3% 🔺)	0.507s	4	2.33x
💻 Local	Express	9.311s (+21.7% 🔺)	10.022s (+25.0% 🔺)	0.710s	3	2.70x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	7.004s (+73.3% 🔺)	8.936s (+47.4% 🔺)	1.932s	5	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.812s (~)	1.024s (~)	0.212s	59	1.00x
🐘 Postgres	Express	0.830s (-1.9%)	1.023s (~)	0.192s	59	1.02x
💻 Local	Express	1.016s (+42.8% 🔺)	1.854s (+81.6% 🔺)	0.838s	33	1.25x
💻 Local	Nitro	1.028s (+47.8% 🔺)	1.854s (+84.6% 🔺)	0.826s	33	1.27x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	21.357s (+136.8% 🔺)	23.123s (+109.1% 🔺)	1.766s	3	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.930s (~)	2.174s (+3.5%)	0.244s	42	1.00x
🐘 Postgres	Express	1.961s (-5.9% 🟢)	2.203s (-25.2% 🟢)	0.241s	41	1.02x
💻 Local	Nitro	3.049s (+34.9% 🔺)	3.843s (+27.7% 🔺)	0.794s	24	1.58x
💻 Local	Express	3.057s (+35.3% 🔺)	3.923s (+30.4% 🔺)	0.866s	23	1.58x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	77.046s (+155.6% 🔺)	81.873s (+152.5% 🔺)	4.826s	2	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	3.923s (+1.2%)	4.183s (+1.8%)	0.259s	29	1.00x
🐘 Postgres	Express	4.028s (-2.2%)	4.568s (-6.6% 🟢)	0.540s	27	1.03x
💻 Local	Nitro	9.078s (+23.4% 🔺)	9.557s (+19.2% 🔺)	0.479s	13	2.31x
💻 Local	Express	9.408s (+28.4% 🔺)	10.019s (+25.0% 🔺)	0.611s	12	2.40x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	279.180s (+135.8% 🔺)	281.660s (+133.7% 🔺)	2.480s	1	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.279s (-3.0%)	1.007s (~)	0.728s	60	1.00x
🐘 Postgres	Express	0.284s (~)	1.007s (~)	0.723s	60	1.02x
💻 Local	Nitro	0.597s (+5.4% 🔺)	1.004s (~)	0.407s	60	2.14x
💻 Local	Express	0.599s (~)	1.005s (-1.6%)	0.405s	60	2.15x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	29.462s (+1579.8% 🔺)	31.326s (+795.2% 🔺)	1.864s	4	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.493s (-2.2%)	1.006s (~)	0.513s	90	1.00x
🐘 Postgres	Express	0.516s (+4.4%)	1.007s (~)	0.491s	90	1.05x
💻 Local	Express	2.607s (+5.9% 🔺)	3.009s (~)	0.402s	30	5.29x
💻 Local	Nitro	2.667s (+9.7% 🔺)	3.181s (+5.8% 🔺)	0.514s	29	5.41x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	4.007s (+46.8% 🔺)	5.844s (+31.4% 🔺)	1.837s	16	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.788s (-1.7%)	1.007s (~)	0.219s	120	1.00x
🐘 Postgres	Express	0.825s (+1.6%)	1.010s (-0.8%)	0.185s	119	1.05x
💻 Local	Nitro	10.898s (+5.6% 🔺)	11.299s (+3.3%)	0.401s	11	13.82x
💻 Local	Express	11.422s (+7.9% 🔺)	12.030s (+9.1% 🔺)	0.608s	10	14.49x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	8.630s (+27.3% 🔺)	10.531s (+22.3% 🔺)	1.901s	12	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-

🔍 Observability: Nitro

Stream Benchmarks (includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Express	0.209s (-2.8%)	0.996s (~)	0.001s (-31.3% 🟢)	1.010s (~)	0.801s	10	1.00x
💻 Local	Nitro	0.209s (+47.7% 🔺)	1.004s (~)	0.010s (-1.0%)	1.016s (~)	0.807s	10	1.00x
💻 Local	Express	0.211s (+49.5% 🔺)	1.005s (~)	0.013s (+33.0% 🔺)	1.019s (~)	0.808s	10	1.01x
🐘 Postgres	Nitro	0.227s (+5.9% 🔺)	0.999s (~)	0.001s (+7.7% 🔺)	1.010s (~)	0.783s	10	1.08x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	7.321s (+370.2% 🔺)	5.622s (+96.7% 🔺)	1.299s (+32.9% 🔺)	10.677s (+149.7% 🔺)	3.356s	10	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-	-

🔍 Observability: Nitro

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.607s (-1.9%)	1.004s (~)	0.004s (-2.1%)	1.022s (~)	0.415s	59	1.00x
🐘 Postgres	Express	0.631s (-1.5%)	1.007s (~)	0.004s (-5.7% 🟢)	1.023s (~)	0.392s	59	1.04x
💻 Local	Express	0.768s (+15.2% 🔺)	1.012s (~)	0.010s (+10.2% 🔺)	1.025s (-8.1% 🟢)	0.256s	59	1.27x
💻 Local	Nitro	0.776s (+34.3% 🔺)	1.012s (~)	0.011s (+21.4% 🔺)	1.026s (~)	0.250s	59	1.28x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	14.022s (+227.8% 🔺)	16.222s (+178.3% 🔺)	0.865s (+147.3% 🔺)	17.548s (+165.4% 🔺)	3.527s	5	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-	-

🔍 Observability: Nitro

10 parallel streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	0.970s (-1.0%)	1.272s (~)	0.000s (+144.7% 🔺)	1.285s (-1.7%)	0.315s	47	1.00x
🐘 Postgres	Express	0.991s (+1.1%)	1.358s (+13.4% 🔺)	0.000s (-100.0% 🟢)	1.380s (+13.4% 🔺)	0.390s	44	1.02x
💻 Local	Nitro	1.269s (+7.5% 🔺)	2.024s (~)	0.000s (~)	2.027s (~)	0.757s	30	1.31x
💻 Local	Express	1.288s (+9.2% 🔺)	2.024s (~)	0.001s (+122.2% 🔺)	2.027s (~)	0.738s	30	1.33x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	4.413s (+56.7% 🔺)	5.929s (+40.7% 🔺)	0.000s (NaN%)	6.454s (+39.2% 🔺)	2.041s	10	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-	-

🔍 Observability: Nitro

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🐘 Postgres	🥇 Nitro	1.817s (+4.4%)	2.100s (-1.9%)	0.000s (-3.4%)	2.124s (-1.3%)	0.307s	29	1.00x
🐘 Postgres	Express	1.848s (+4.6%)	2.144s (~)	0.000s (-100.0% 🟢)	2.183s (+1.6%)	0.335s	28	1.02x
💻 Local	Nitro	3.463s (-7.8% 🟢)	4.033s (-3.2%)	0.001s (-20.0% 🟢)	4.036s (-3.2%)	0.573s	15	1.91x
💻 Local	Express	3.785s (+7.9% 🔺)	4.234s (+5.0% 🔺)	0.000s (+60.0% 🔺)	4.236s (+5.1% 🔺)	0.451s	15	2.08x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	8.328s (+96.3% 🔺)	9.823s (+74.7% 🔺)	0.000s (-100.0% 🟢)	10.296s (+70.6% 🔺)	1.968s	6	1.00x
▲ Vercel	Express	⚠️ missing	-	-	-	-	-

🔍 Observability: Nitro

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Nitro	15/21
🐘 Postgres	Nitro	14/21
▲ Vercel	Nitro	21/21

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	🐘 Postgres	19/21
Nitro	🐘 Postgres	18/21

Column Definitions

Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
Wall Time: Total testbench time (trigger workflow + poll for result)
Overhead: Testbench overhead (Wall Time - Workflow Time)
Samples: Number of benchmark iterations run
vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

💻 Local: In-memory filesystem world (local development)
🐘 Postgres: PostgreSQL database world (local development)
▲ Vercel: Vercel production/preview deployment
🌐 Turso: Community world (local development)
🌐 MongoDB: Community world (local development)
🌐 Redis: Community world (local development)
🌐 Jazz: Community world (local development)

📋 View full workflow run

vercel · 2026-04-16T16:19:11Z

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Copilot

Pull request overview

Adds a dedicated “Python SDK” page to the docs Getting Started section and surfaces it prominently in the Getting Started framework grid, including a new Python logo icon export.

Changes:

Added docs/content/docs/getting-started/python.mdx with a beta warning and Python concept/code examples.
Updated Getting Started index to include a Python SDK card (with a “Beta” badge) and place it first.
Added a Python SVG icon export in frameworks.tsx (and reformatted that file’s string quoting).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
docs/content/docs/getting-started/python.mdx	New Python SDK page content with beta callout and concept sections.
docs/content/docs/getting-started/index.mdx	Adds the Python SDK card + Beta badge to the Getting Started grid.
docs/app/[lang]/(home)/components/frameworks.tsx	Exports a new Python SVG icon for use in docs UI.

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

Copilot · 2026-04-16T16:23:08Z

+    <Card href="/docs/getting-started/python">
+      <div className="flex flex-col items-center justify-center gap-2">
+        <Python className="size-16" />
+        <span className="font-medium">Python SDK</span>
+        <Badge variant="secondary">Beta</Badge>


The Getting Started section appears to be ordered/curated via docs/content/docs/getting-started/meta.json (pages array). That list currently doesn’t include python, so this new page may not show up in the left nav / page ordering even though it’s linked here. Add python to the pages list (and place it first if you want it highlighted first, consistent with this grid).

Copilot · 2026-04-16T16:23:09Z

+---
+title: Python SDK
+description: Get started with the Vercel Workflow Python SDK for building durable, long-running workflows.
+type: guide
+summary: Set up the Workflow Python SDK in your Python application.
+prerequisites:


Frontmatter and placement suggest this is a “Getting Started” setup guide (type: guide, summary: Set up...), but the page content is mostly conceptual and doesn’t include the setup steps pattern used by the other getting-started guides (e.g., <Steps> / installation/configuration). Either add the initial setup section(s) or adjust the frontmatter/type/summary so it matches what the page actually provides.

Copilot · 2026-04-16T16:23:09Z

+import random
+from app.workflow import wf
+
+@wf.step
+async def generate_draft(*, topic: str):
+    return await ai_generate(prompt=f"Write a blog post about {topic}")
+
+@wf.step
+async def summarize_draft(*, draft: str):
+    summary = await ai_summarize(text=draft)
+
+    # Simulate a transient error. The step automatically retries.
+    if random.random() < 0.3:
+        raise Exception("Transient AI provider error")
+
+    return summary
+```
+
+Each step compiles into an isolated route. While the step executes, the workflow suspends without consuming resources. When the step completes, the workflow resumes automatically where it left off.
+
+### Sleep
+
+Sleep pauses a workflow for a specified duration without consuming compute resources. Use it when you need to wait for hours or days before continuing, such as sending a follow-up email or delaying a reward.
+
+```python
+from vercel import workflow
+from app.workflow import wf
+


Several examples import wf from app.workflow / app.workflows.approval, but this is the only doc page using that module path and it’s not established earlier in the guide. For clarity and copy/paste-ability, either show wf = workflow.Workflows() in each snippet, or use a clearly-placeholder module path (e.g., from my_app.workflow import wf) and add a short note that wf is the shared Workflows() instance.

Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

Added a new card for the Python getting started guide with a beta badge. Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

Updated the description for clarity and conciseness. Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

feat: add Python SVG icon and related documentation

d62bf01

Slack-Thread: https://vercel.slack.com/archives/C0AG7R4PU22/p1776354109663229?thread_ts=1776354109.663229&cid=C0AG7R4PU22 Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

Copilot AI review requested due to automatic review settings April 16, 2026 16:19

pranaygp requested a review from a team as a code owner April 16, 2026 16:19

pranaygp added the v0 label Apr 16, 2026 — with Vercel

Copilot started reviewing on behalf of pranaygp April 16, 2026 16:19 View session

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Copilot AI reviewed Apr 16, 2026

View reviewed changes

feat: reintroduce Python SDK card in getting-started guide

a4a6a6b

Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

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v0 Bot and others added 3 commits April 16, 2026 16:45

feat: refactor sidebar item badges to use array and function for mapping

9357f60

Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

feat: add Python getting started guide card in beta

4c223d8

Added a new card for the Python getting started guide with a beta badge. Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

feat: simplify description of Workflow Python SDK

c6e936f

Updated the description for clarity and conciseness. Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

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feat: enhance Python SDK documentation and examples

42930b0

Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

vercel Bot deployed to Preview – workflow-web April 16, 2026 16:50 View deployment

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fix: update Python SDK documentation link for language parameter

ce26467

Co-authored-by: Pranay Prakash <1797812+pranaygp@users.noreply.github.com>

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pranaygp commented Apr 16, 2026

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