→ CRMs (HubSpot, GoHighLevel)... create and update contacts, move pipeline stages, log activity, trigger follow-ups
→ Databases (Supabase, Airtable)... the agent reads records, writes updates and searches your documents with vector search
→ Apps (Google Workspace, Slack, email, SMS, WhatsApp)... replies, alerts, and handoffs to your team happen from the same flow
→ APIs & webhooks (REST, authentication, real-time sync): tools that normally don’t talk to each other, now talking