AI Agent Runtime Comparison — AI Builders Network
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Framework-first:
- LangGraph      — state machines, cycles, human-in-the-loop
- CrewAI         — role-based multi-agent teams
- AutoGen        — conversational multi-agent orchestration

SDK-first:
- OpenAI Agents SDK   — lightweight, direct tool use
- Anthropic tool use  — native Claude tool calling
- Vercel AI SDK       — streaming + tool loops in TypeScript

Roll your own:
- Best for: single-agent, 1-3 tools, tight control
- Pattern: while loop + tool schema + structured output parser
- Migrate when: you need memory, branching, or multi-agent

Pick the smallest option that ships your v1 this week.