Anthropic's SDK for building agents on Claude — the harness behind Claude Code, with in-process tools, hooks, and an interactive client. Formerly the Claude Code SDK.
Graph-based orchestration for stateful, multi-actor agent workflows with explicit control flow and checkpointing.
OpenAI's lightweight agent framework — a small set of primitives (Agents, Handoffs, Guardrails, Sessions); provider-agnostic via LiteLLM. Evolved from Swarm.
Type-safe agent framework from the Pydantic team — structured outputs, dependency injection, and model-agnostic agents.
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