Harnesses & SDKs

Lightweight Python framework for composing AI agents and tools as small, typed pieces built on Instructor and Pydantic.

Python and TypeScript SDK that gives an AI agent a phone number, with pluggable LLM, speech and telephony providers.

Python framework for structured LLM outputs and agentic workflows built from tasks, agents and threads.

Open-source reinforcement learning framework that trains LLM agents on multi-step tasks using GRPO.

Python framework for orchestrating multiple LLM agents in sequential, concurrent, hierarchical and graph-based workflows.

Open-source framework that builds, evaluates and self-improves multi-agent LLM workflows from a goal.

Python framework for backtesting and running trading strategies written as Python rules or AI agents, across brokers.

Python framework that models an application as a state machine, with a trace UI and persisted state.

Modular Python agent framework with a tool-calling loop, context management, retrieval, persistent memory and MCP tools.

Python framework for LLM apps built from collaborating agents that hold conversation state, tools and vector-store memory.

Python library that turns files in S3, GCS and Azure into versioned, typed datasets for pipelines and agents.

Python and TypeScript toolkit for calling any frontier LLM through one interface, with tools, structured output and tracing.

Python library and CLI for building agents that run on IBM watsonx Orchestrate, with a local Developer Edition for testing.

Python agent runtime with an SDK for building your own agent, and an app that adds plugins and channel integrations.

Python and TypeScript SDK and REST Agent Server for building agents that work with code in local or containerized workspaces.

Python framework for LLM agents that run as durable Dapr workflows, with retries, Kubernetes deployment and human-in-the-loop hooks.

Archived Microsoft Python framework for multi-agent apps; Microsoft directs new users to Microsoft Agent Framework.

Gym-style Python environment for building and evaluating web agents on MiniWoB, WebArena, WorkArena and other benchmarks.

Model-agnostic SDK for building agents and multi-agent systems in Python, .NET and Java; Microsoft names Agent Framework as its successor.

Python library for autonomous agents that run scheduled tasks and exchange messages on the Fetch.ai network.

Python framework for multi-agent applications where agents with defined roles talk through explicit flows, built on the OpenAI Agents SDK.

Open infrastructure for discovering, evaluating, creating and routing reusable AI agent skills, with a Python SDK.

Python framework for real-time voice and vision agents that process video with pluggable models and processors over WebRTC.

Open-source platform for voice agents that place and answer phone calls through Twilio or Plivo with pluggable speech and LLM providers.