Microsoft Graph webhook
Validate clientState, enqueue the message, return 202.
Provider-independent mail pipeline
Thin webhook.
Durable work.
Next.js owns HTTP and UI, Inngest owns retries, Supabase owns user-scoped state, and Microsoft Graph is isolated behind an EmailProvider adapter.
Durable Inngest worker
Fetch bounded content and run the GPT-5.6 orchestrator.
Deterministic business tools
Validate SKUs, calculate totals, optimize the free-shipping bundle.
Human-review output
Apply a category and create an Outlook draft. Never send.