Engineering leaders and senior developers are rapidly adopting AI coding assistants like Cursor and Claude. The speed gains are undeniable. But when it comes to building third-party API integrations, the experience often hits a brick wall. You ask your AI to build a HubSpot or Salesforce integration. It confidently hallucinates a /v4/contacts endpoint, invents an undocumented pagination parameter, and leaves you debugging an invalid_grant error for 45 minutes.