Give your agent mailbox a vacation auto-responder

Short summary

A tutorial on building a deterministic auto-acknowledgment pattern for agent-owned email addresses using Nylas Agent Accounts. When the AI agent is offline or rate-limited, a lightweight webhook handler replies once per thread with a canned message and records the thread_id to prevent duplicate responses. No model is needed in the hot path — just deterministic code with loop and idempotency guards.

• •Agent mailboxes need auto-responders just like human ones
• •Reply once per thread using thread_id as the dedup key
• •Deterministic code handles acknowledgment; no model in the hot path

Generated with AI, which can make mistakes.