Use when integrating the npm packages `mailbox-station` (provider-agnostic mailbox-watch core) or `gmail-station` (Gmail provider). Triggers for: wiring up `createStation`, writing or porting a `StoreAdapter`, building a `MessageHandlerFn`, configuring the Gmail provider (OAuth, Pub/Sub, watch lifecycle), tuning the trigger worker (concurrency, backoff, dead-letter), interpreting tagged errors, scheduling watch renewal, or any question of the form "how do I do X with mail-station / gmail-station". Do NOT trigger for: generic email parsing libraries, raw Gmail API usage outside this stack, IMAP, or sending mail.
2026-04-29