## Summary
Lets the email workflow node sender be driven by a variable: the
connected-account field accepts a `{{variable}}`, and the backend
resolves it to a connected account at run time.
<img width="436" height="195" alt="Capture d’écran 2026-06-16 à 11 59
27"
src="https://github.com/user-attachments/assets/18eee21e-aed6-4447-9bf4-5cb0e2cfc371"
/>
### Email sender by variable
- The connected-account field now accepts a `{{variable}}` via the
variable picker (uses `FormSelectFieldInput` with
`WorkflowVariablePicker`), with a hint to pick a connected account or
set a workspace member as a variable.
- The email workflow action resolves the stored sender value explicitly:
if it is a `workspaceMemberId` (a UUID matching a workspace member), it
resolves that member's first connected account; otherwise the value is
used directly as a `connectedAccountId`.
- Resolution lives in `EmailWorkflowActionBase` and applies to both
`SEND_EMAIL` and `DRAFT_EMAIL`. If a matching member has no connected
account, the run fails fast with a clear message (no silent fallback).
- `DRAFT_EMAIL` also fails fast when the resolved connected account is
missing the required OAuth scopes (`gmail.compose` / `Mail.Send`), via a
server-side `getMissingDraftEmailScopes` util that mirrors the front-end
check.
- Existing workflows with a hardcoded `connectedAccountId` keep working
unchanged (no migration needed).
> Note: exposing the running workspace member as a manual-trigger
variable (`_metadata.workspaceMemberId`) is split into a follow-up PR.
## Test plan
- [x] Backend unit tests for `draft-email-tool`,
`get-missing-draft-email-scopes`, and the `send-email` / `draft-email`
workflow actions (incl. workspace-member sender resolution)
- [x] Lints clean on all changed files
- [x] Manual: configure an email node with a workspace-member variable
sender and confirm it resolves and drafts/sends
- [x] Manual: confirm a member lacking compose permission fails the run
with the permission message
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---
### Update — scoped to Draft Email only
The sender variable picker is now exposed **only on the Draft Email
node**. The Send Email node keeps a plain account select (no variable
picker, no variable hint) until we enable it there in a follow-up.
Backend resolution still lives in `EmailWorkflowActionBase` and remains
generic, so enabling the picker for Send Email later requires no backend
change.
Thomas Trompette
8130fa1c45
