docs(rivetkit): raise serverless start payload limit

[NathanFlurry]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[NathanFlurry]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• fix(pegboard): restore hibernating request ids #4898 : 3 dependent PRs (#4899 , #4916 , #4917 )
• chore(guard): configure local timeout knobs #4913
• docs(rivetkit): raise serverless start payload limit #4911 👈 (View in Graphite)
• test(kitchen-sink): add sqlite memory soak harness #4910
• feat(rivetkit): expose runtime diagnostics #4909
• chore(depot-client): migrate to worker thread #4907 : 2 other dependent PRs (#4912 , #4918 )
• test(driver): select matrix cells with vitest filters #4906
• fix(pegboard): restore hibernating requests on serverful start #4904 : 1 other dependent PR (#4905 )
• fix(rivetkit): drain shutdown work before sleep #4902 : 1 other dependent PR (#4903 )
• feat(sqlite): wire remote sqlite execute handlers #4897
• test(serverless): avoid pinning header validation order #4896
• chore(driver-test-runner): add native/wasm runtime matrix to skill #4884 : 3 other dependent PRs (#4892 , #4894 , #4901 )
• chroe: rename rivetkit-sqlite to depot-client #4883
• fix(rivetkit-wasm): fix mem leaks #4880
• chore(rivetkit): wasm support #4860
• feat(sqlite): add cold read benchmarks and simplify optimizations #4857
• feat(sqlite): benchmark cold reads #4848 : 1 other dependent PR (#4864 )
• docs(actors): document manual lifecycle controls #4847
• test(sqlite): expand db stress coverage #4846 : 1 other dependent PR (#4849 )
• test(raw-websocket): add serverless smoke coverage #4845
• feat(serverless): configure drain grace period #4844
• fix(publish): enable frontend build for engine target and use turbo build instead of turbo build:engine #4843
• feat(rivetkit): expose conn handle in onWebSocket context #4842
• fix(rivetkit): normalize waitUntil/keepAwake promises to null to avoid serde undefined error #4841
• fix(rivetkit): remove requirement for token #4839 : 1 other dependent PR (#4840 )
• fix(pegboard-envoy): allow sqlite requests across lifecycle states #4838
• fix(pegboard): route scoped actor key reads by runner dc #4837
• fix(sqlite-storage): let sqlite open take over stale owners #4834
• fix(engine-tests): parallelize multi-DC startup + enable 6 multi-DC tests #4833
• fix(api): honor cursor in actor_ids list path #4832
• fix(api): silently filter invalid IDs from actor_ids query instead of 400 #4831
• fix(api-peer): make actors_delete idempotent for already-destroyed actors #4830
• fix(pegboard): use Iterator streaming mode in list_names so limit param is honored #4829
• chore(engine-tests): convert envoy tests to Sleep crash policy + triage ignored #4828
• feat(engine-tests): wire envoy actor names through prepopulate_actor_names #4827
• chore(depot): fault injection tests #4868
• feat(sqlite): pitr & forking #4859 : 1 other dependent PR (#4863 )
• chore(sqlite): stateless storage refactor #4856
• main

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[claude]

PR Review: docs(rivetkit): raise serverless start payload limit

Summary

This PR raises the default serverless.maxStartPayloadBytes limit from 1 MiB to 16 MiB. In serverless mode, the /api/rivet/start request body carries actor config plus preloaded KV and SQLite startup data. Since the default preload budget can already reach 1 MiB and SQLite startup page preloads can be larger, the old 1 MiB limit was easily exhausted. The PR also adds a dev:serverless npm script to the kitchen-sink example and updates documentation.

---

Should Fix

Stale artifact in rivetkit-typescript/artifacts/registry-config.json

Line 152 still shows "Default: 1048576". The DocServerlessConfigSchema description now uses ${DEFAULT_SERVERLESS_MAX_START_PAYLOAD_BYTES} (= 16777216), but the checked-in artifact has not been regenerated. Per project convention, artifacts should be regenerated in the same change. Run:

cd rivetkit-typescript/packages/rivetkit && pnpm run registry-config-schema-gen

---

Nice to Fix

examples/kitchen-sink-vercel not updated

examples/kitchen-sink-vercel/src/index.ts does not include the serverless.maxStartPayloadBytes config added to examples/kitchen-sink/src/index.ts. Since the Vercel example is a mirror of the kitchen-sink, it should be regenerated via scripts/vercel-examples/generate-vercel-examples.ts.

---

Optional

Hardcoded value in kitchen-sink example

In examples/kitchen-sink/src/index.ts, the fallback value 16 * 1024 * 1024 is hardcoded rather than importing DEFAULT_SERVERLESS_MAX_START_PAYLOAD_BYTES from rivetkit. Minor DRY concern: if the default changes again, the example won't track it automatically.

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Looks Good

• Named constant DEFAULT_SERVERLESS_MAX_START_PAYLOAD_BYTES is the right approach, eliminating previous duplication.
• Documentation additions in limits.mdx and production-checklist.mdx are accurate and actionable.
• All CLAUDE.md conventions followed: correct domain (rivet.dev), no em dashes, conventional commit format, no wildcard match arms.
• No test changes needed — this is a configuration default change validated at runtime via Zod schema.

[NathanFlurry]

Landed in main via stack-merge fast-forward push. Commits are in main; closing to match.