[Silthus]

Problem

• A project that later verifies its own sender keeps old workflows on the sandbox sender, which reaches only members.
• This PR adds the switch logic. #129069 renders it.
• Layer 16 of the product stack, on #129067. Next: #129069. Split from #128414, which stays open until this split replaces it.

Merge danger

Note

🔵 Merge risk: low · two-way door (merge-risk rubric)

• A new logic that nothing mounts until #129069. workflowLogic only names its draft action type, so kea-typegen can connect it.
• Revert: git revert the merge commit.

Changes

• No visible change until #129069.
• The logic finds a workflow's sandbox email steps and moves them all to a verified own sender as one workflow change. Auto-save stores it on a draft workflow.
• It lets the user pick when several own senders are verified. It does nothing for a viewer, during an external edit, or while a publish or discard runs.
• When auto-save will not run, the toast says what is left: "Save and publish the changes to use this sender." on an active workflow, "Save the workflow to keep this change." otherwise.

How did you test this code?

Test rationale: workflowSandboxSwitchBannerLogic.test.ts catches a banner shown with the flag off or to a viewer, a switch that misses a step, a switch during a publish or discard, a toast that claims a save that will not happen, and analytics sent more than once per view.

• Live run at this head: Not run yet. An earlier local run through #129069 moved a draft's sandbox step to the own sender. It was not saved as proof.

Release status

• This change is behind a feature flag and is not available to users

Docs update

• None.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Agent: Claude Code, Claude Opus 5.5

Skills: /writing-tests, /writing-ui-components, /writing-user-facing-copy, /writing-code-comments, /stacking-prs, /writing-pr-descriptions, /qa-swarm

Decisions for the whole sandbox sender stack

Question	Answer	Who	Where
Who gets a sandbox email	Verified members of the team's organization, checked at send time over To, CC and BCC	👤 Human	decision record
Sender identity	Fixed From address on a dedicated PostHog domain, "Acme via PostHog" display name, no From or Reply-To override	👤 Human	decision record
Where it can send	Workflow email steps and test sends only, not broadcasts or transactional email	👤 Human	decision record
How the sender is stored	One managed email integration per team, provider sandbox, created only by PostHog code	👤 Human	decision record
SES setup	One shared identity, configuration set and tenant for all sandbox sends	👤 Human	decision record
Landing order	Three-PR skeleton, then the flag to our team, then caps and polish (replaced landing the twelve-layer stack at once)	👤 Human	decision record
Node gate	Environment switch WORKFLOWS_SANDBOX_SENDER_ENABLED, no feature flag in CDP Node code	👤 Human	decision record
Member check in the skeleton	Keep it, although the ask was a skeleton with no limits	👍 Accepted default	decision record
Behavior with everything off	No change while the flag and switch are off	👍 Accepted default	decision record
Earlier PRs	Close #127149 to #127153, #127136 and #127137, each linked to its successor	👍 Accepted default	decision record
PR shape	Two native stacks of small PRs: Node (4) and product (5)	👍 Accepted default	decision record
Member lookup cache in the skeleton	Dropped; every check is one fresh lookup, the cache returns with the caps stack	👍 Accepted default	decision record
Member lookup that gets its connection late	Runs no query; the cap on waiting lookups returns with the cache	🤖 Agent	decision record
Tier budget	Sandbox sends never spend the team's tier budget	🤖 Agent	decision record
When members are checked	Before preparing the send and again fresh before delivery	🤖 Agent	decision record
Member lookup fails	Skip the send with a log	🤖 Agent	decision record
Blocked-send events	At most one per team, reason and hour	🤖 Agent	decision record
How a team gets the sender	Opening Channels with the flag on creates it	🤖 Agent	decision record
Managed sender guards	Nobody can edit, verify, delete or default the sandbox sender	🤖 Agent	decision record
Quoted member addresses	Skip the send, and canonicalize in the caps stack instead of respinning the skeleton	🤖 Agent	decision record
Re-split of #128410 to #128414	Pieces of about 400 changed lines or fewer, Node and product code in separate PRs	👤 Human	requested in the agent session that wrote this split

No open questions.

More context for AI agents

• Session: Claude Code. Review rounds 1, 2 and final reads 1 to 4 ran on Claude Opus 5.5 only, because the GPT reviewers were unreachable for the whole session.
• Decisions: the logic reuses integrationsLogic, which workflowLogic already mounts, so it adds no request.
• Decisions: the switch replaces the whole from, because no save path stores the sandbox sender beside another sender.
• Decisions: the switched event fires on the click, because it counts the user's switch and the edit applies either way (3cb37ef).
• Follow-ups: export workflowLogic's draft-staging rule as one predicate that the toast and the save path share.
• Origin: split from #128414. The merged tops of the new stacks match the old stack's production code.
• Read closely: workflowSandboxSwitchBannerLogic.ts.

🤖 Generated with Claude Code

[github-actions]

🤖 CI report

⚠️ Trunk lane — backend Python lane

This PR is assigned to the backend Python lane. It runs backend Python tests and may merge in parallel with PRs in other lanes.

⚠️ Complexity (TypeScript) — 3 functions above the limit (max 45)

Cyclomatic complexity above the limit in changed typescript files (10 for production files, 15 for test files). Warn only: worth simplifying when you next touch these functions.

Function	Location	Complexity	Limit
saveWorkflowSuccess	products/workflows/frontend/Workflows/workflowLogic.ts:4748	45	10
runSave	products/workflows/frontend/Workflows/workflowLogic.ts:3627	42	10
<anonymous>	products/workflows/frontend/Workflows/workflowLogic.ts:4182	42	10

✅ Duplication (Python) — clean

New Python code duplication introduced by this branch. Fails at 70+ tokens in app code, or 150+ tokens when both copies live in test files. Advisory while the gate proves itself: extract a shared helper instead of copying.

✅ Duplication (TypeScript) — clean

New TypeScript code duplication introduced by this branch. Fails at 70+ tokens in app code, or 150+ tokens when both copies live in test files. Advisory while the gate proves itself: extract a shared helper instead of copying.

✅ Bundle size — no change

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 77.45 MiB · no change

No file changed by more than 1000 B.

_{Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report}

✅ Eager graph — within budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root	Eager (shipped)	Δ vs base	Budget
entry (logged-out pages, app bootstrap) src/index.tsx	1.03 MiB · 25 files	no change	█████████░ 90.1% of 1.14 MiB
logged-out boot: index + App + bootApp (preloaded by every page, including /login) src/index.tsx + src/scenes/App.tsx + src/scenes/bootApp.ts	3.01 MiB · 625 files	no change	██████████ 99.2% of 3.03 MiB
authenticated shell (every logged-in page) src/scenes/AuthenticatedShell.tsx	3.83 MiB · 1,228 files	no change	██████████ 95.6% of 4.01 MiB
dashboard scene src/scenes/dashboard/Dashboard.tsx	7.61 MiB · 2,942 files	no change	████████░░ 77.4% of 9.84 MiB
today home path src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/today/TodayHome.tsx	4.70 MiB · 1,760 files	no change	██████████ 95.4% of 4.93 MiB
AI-first home path src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx	6.00 MiB · 2,266 files	no change	██████████ 95.7% of 6.27 MiB
events scene src/scenes/activity/explore/EventsScene.tsx	6.69 MiB · 2,520 files	no change	███████░░░ 71.1% of 9.41 MiB
web analytics scene src/scenes/web-analytics/WebAnalyticsScene.tsx	7.71 MiB · 2,885 files	no change	███████░░░ 73.5% of 10.49 MiB
replay detail scene src/scenes/session-recordings/detail/SessionRecordingDetail.tsx	6.91 MiB · 2,606 files	no change	█████████░ 85.0% of 8.13 MiB

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36.4 KiB	../node_modules/.pnpm/kea@4.0.0-pre.6_patch_hash=139b8d1f1304f9d9da452a9a1244c94ea679dbcb85687d8999563146879fb6f5_react@18.3.1/node_modules/kea/lib/index.cjs.js
32.5 KiB	src/lib/utils/eventUsageLogic.ts
28.6 KiB	src/lib/constants.tsx

Largest files eagerly shipped from src/scenes/dashboard/Dashboard.tsx

Size	File
359.8 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs
224.1 KiB	../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
115.8 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/surveys-preview.js
111.3 KiB	../packages/quill/packages/primitives/dist/index.js
105.7 KiB	src/products.tsx
96.1 KiB	../packages/quill/packages/components/dist/index.js
87.4 KiB	src/lib/api.ts
79.0 KiB	src/scenes/dashboard/dashboardLogic.tsx
68.7 KiB	src/lib/lemon-ui/icons/icons.tsx

Largest files eagerly shipped from src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/today/TodayHome.tsx

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224.1 KiB	../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
111.3 KiB	../packages/quill/packages/primitives/dist/index.js
105.7 KiB	src/products.tsx
87.4 KiB	src/lib/api.ts
68.7 KiB	src/lib/lemon-ui/icons/icons.tsx
68.5 KiB	../products/posthog_ai/frontend/logics/runStreamLogic.ts
41.9 KiB	../node_modules/.pnpm/@dnd-kit+core@6.0.8_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@dnd-kit/core/dist/core.esm.js
36.4 KiB	../node_modules/.pnpm/kea@4.0.0-pre.6_patch_hash=139b8d1f1304f9d9da452a9a1244c94ea679dbcb85687d8999563146879fb6f5_react@18.3.1/node_modules/kea/lib/index.cjs.js

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359.8 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs
224.1 KiB	../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
111.3 KiB	../packages/quill/packages/primitives/dist/index.js
105.7 KiB	src/products.tsx
87.4 KiB	src/lib/api.ts
68.7 KiB	src/lib/lemon-ui/icons/icons.tsx
68.5 KiB	../products/posthog_ai/frontend/logics/runStreamLogic.ts
41.9 KiB	../node_modules/.pnpm/@dnd-kit+core@6.0.8_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@dnd-kit/core/dist/core.esm.js
41.7 KiB	src/scenes/hog-functions/sub-templates/sub-templates.ts

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Size	File
359.8 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs
224.1 KiB	../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
111.3 KiB	../packages/quill/packages/primitives/dist/index.js
105.7 KiB	src/products.tsx
96.1 KiB	../packages/quill/packages/components/dist/index.js
87.4 KiB	src/lib/api.ts
79.0 KiB	src/scenes/dashboard/dashboardLogic.tsx
68.7 KiB	src/lib/lemon-ui/icons/icons.tsx
68.5 KiB	../products/posthog_ai/frontend/logics/runStreamLogic.ts

Largest files eagerly shipped from src/scenes/web-analytics/WebAnalyticsScene.tsx

Size	File
359.8 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs
224.1 KiB	../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
115.8 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/surveys-preview.js
111.3 KiB	../packages/quill/packages/primitives/dist/index.js
105.7 KiB	src/products.tsx
96.1 KiB	../packages/quill/packages/components/dist/index.js
87.4 KiB	src/lib/api.ts
79.0 KiB	src/scenes/dashboard/dashboardLogic.tsx
68.7 KiB	src/lib/lemon-ui/icons/icons.tsx

Largest files eagerly shipped from src/scenes/session-recordings/detail/SessionRecordingDetail.tsx

Size	File
359.8 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs
321.1 KiB	../node_modules/.pnpm/posthog-js@1.447.1_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/rrweb.js
224.1 KiB	../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
111.3 KiB	../packages/quill/packages/primitives/dist/index.js
105.7 KiB	src/products.tsx
96.1 KiB	../packages/quill/packages/components/dist/index.js
87.4 KiB	src/lib/api.ts
68.7 KiB	src/lib/lemon-ui/icons/icons.tsx
68.5 KiB	../products/posthog_ai/frontend/logics/runStreamLogic.ts

_{Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of #32479}

✅ Frontend layers — no new upward imports, 0 removed

Static imports from a lower frontend layer into a higher one (layers, lowest first: kernel, shell, query, features). Compared with the base branch, so an import that a PR also adds to layer-baseline.txt still shows here. Sizes are the source bytes on the eager path of every logged-in page.

Layer	Eager source bytes	Δ vs base
kernel	2.98 MiB	no change
shell	2.36 MiB	no change
query	56.2 KiB	no change
features	273.8 KiB	no change

Download the interactive layer graph for this PR.

_{Posted automatically by check-layers}

✅ Toolbar bundle — eager 2.43 MiB within budget

What the toolbar ships to customer pages, measured from the esbuild output (minified, post-tree-shake). The eager set is the entry plus everything statically imported from it — fetched before any feature runs; deferred chunks load lazily. The eager guardrail is 5.72 MiB. Each output file must also stay below 10 MB, where CloudFront stops compressing it. The module boundary is enforced separately by check-toolbar-graph.

Metric	Size	Δ vs base	Budget
Eager (shipped) entry + static imports	2.43 MiB · 19 files	no change	████░░░░░░ 42.4% of 5.72 MiB
Deferred (lazy)	2.64 MiB · 44 files	no change	n/a — loads on demand
Loader dist/toolbar.js	1.2 KiB	no change	█░░░░░░░░░ 6.0% of 19.5 KiB

Largest eagerly-shipped chunks

Size	File
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732.4 KiB	dist/toolbar/chunk-chunk-XCZRZIIC.js
290.5 KiB	dist/toolbar/chunk-chunk-CBC3BDP6.js
137.0 KiB	dist/toolbar/chunk-chunk-LEJIL3JC.js
131.8 KiB	dist/toolbar/chunk-chunk-FQJO25M6.js
75.7 KiB	dist/toolbar/toolbar-app-6FRSQOKZ.js
69.0 KiB	dist/toolbar/chunk-chunk-BFAXZMC5.js
33.8 KiB	dist/toolbar/chunk-chunk-6EBAJOMK.js
21.9 KiB	dist/toolbar/chunk-chunk-OO42VSLI.js
6.8 KiB	dist/toolbar/chunk-chunk-RVLGRPCH.js

_{Posted automatically by check-toolbar-size · sizes are toolbar output bytes (shipped, post-tree-shake) from the esbuild metafile}

✅ Dist folder size — 🔺 +117 B (+0.0%)

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 991.59 MiB · 🔺 +117 B (+0.0%)

✅ Playwright — all passed

All tests passed.

View test results →

[posthog]

PostHog Review · Standard · reviewed 09b8cdf: 1 Should fix.

This is the only automatic review while this pull request is a draft. Comment @posthog review to review new changes sooner. Otherwise, a review of the new changes runs when you mark it ready for review.

See this review and its findings in PostHog Review. Comment @posthog review --deep for a Deep review. A Deep review takes longer and looks deeper than a Standard review.

[parameterai]

Risk: No findings

This PR adds an unmounted kea logic that moves a workflow's sandbox email steps to a verified own sender, plus a type alias cleanup in workflowLogic. The switch validates its target against the team's own verified integrations and the Editor access level before mutating, and the resulting write flows through the existing save path, where the backend serializer resolves the sender integration against the team. I found no security vulnerability introduced by this change.

_{Sentinel reviewed e8f2b98 · Review settings}

[veria-ai]

PR overview

No security issues were found in this pull request.

Reviews

• bbec137 — No new issues
• ae124fd — No new issues
• 3a3e042 — No new issues

[posthog]

PostHog Review · Standard · reviewed e8f2b98: 2 Should fix.

[posthog]

P2 · Resolve sandbox senders for the workflow's environment

When the selected environment differs from its parent project, firstRunSender loads and provisions senders using ApiConfig.getCurrentTeamId(), but integrationsLogic loads currentProjectId. Its sandboxEmailSender therefore misses the workflow's sender, leaving sandboxEmailSteps empty and hiding the switch. Resolve senders for the workflow's environment.

[posthog]

P2 · Include new workflows in the save reminder

For a new workflow containing a sandbox step, switching with auto-save enabled produces a success toast without a save reminder. However, autoSaveWorkflow explicitly skips workflows whose ID is missing or new, so the switch remains unsaved. Include the workflow ID and template-editing guards when deciding whether the toast must ask the user to save.

[Silthus]

Note

🤖 Claude Opus 5.5 responding on behalf of Michael

Closed in the isolated sandbox rebuild. The one-click switch is deferred and will be rebuilt before the wider rollout.