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A tweet compares mainstream AI Agent development frameworks (such as Pi Agent, OpenAI Agents SDK, LangGraph, LlamaIndex, Pydantic AI) and gives selection recommendations for different scenarios.
After reviewing 14 AI SaaS MVPs built with tools like Lovable, Bolt, and Cursor, the author identifies five common production failures: untested RLS policies, broken auth refresh flows, background jobs sharing the same connection pool, poorly designed schemas, and missing idempotency for payments/APIs. The fix is 2-3 weeks of targeted infrastructure work.
Sequoia partner Julien Bek predicts AI will end the SaaS era; the next trillion-dollar winner will sell completed work, not software.