▸ Largest ecosystem; LangGraph for controllable agents.
Open-source frameworks for LLM apps and stateful agents, plus the LangSmith platform.
Quick answer: Best overall to build an AI agent in code: LangChain / LangGraph. Largest ecosystem; LangGraph for controllable agents. Runner-up: OpenAI Agents SDK (Minimal primitives: agents, handoffs, guardrails, tracing). Also strong: Claude Agent SDK. We list 14 tools below, ranked by quality and fit.
Use an SDK/framework to build agents with tools, planning and multi-step reasoning.
▸ Largest ecosystem; LangGraph for controllable agents.
Open-source frameworks for LLM apps and stateful agents, plus the LangSmith platform.
▸ Minimal primitives: agents, handoffs, guardrails, tracing.
Lightweight open-source SDK for multi-agent workflows.
▸ Reuse the Claude Code agent loop, tools and context management.
SDK exposing the Claude Code agent harness for custom agents.
▸ Typed, production-friendly Python agents.
Type-safe Python agent framework from the Pydantic team.
▸ Top choice for TypeScript developers.
TypeScript agent framework with memory, tools, MCP and observability.
▸ Unified provider API and streaming UI for web apps.
TypeScript toolkit for AI apps and agents.
▸ Model-agnostic, deploys easily to Google Cloud.
Google's open-source Agent Development Kit.
▸ Simple role-based multi-agent orchestration.
Framework and platform for multi-agent 'crews'.
▸ Agent workflows over your data.
Agent framework plus LlamaParse document parsing and workflows.
▸ Fast, lightweight agents with built-in memory.
Python framework and runtime for multi-agent systems.
▸ Tiny codebase; agents that write Python actions.
Hugging Face's minimal code-acting agent library.
▸ Influential research multi-agent framework; check project status before new work.
Microsoft's open-source multi-agent framework.
▸ Free way to prototype Gemini prompts and grab API code.
Google's studio for Gemini models, including 'Build' vibe-coding mode.
▸ Not a framework: swap models behind one API.
Unified API for hundreds of LLMs.
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