175 listed
Harnesses & SDKs
Frameworks and SDKs for building agents: the Claude Agent SDK, OpenAI Agents SDK, LangGraph, CrewAI and many more. Each page lists languages, packages, MCP and A2A support and how it orchestrates agents, with a link to the page every fact came from.
Showing 25–48 of 105
- 0.698score
PageIndex
VectifyAI
Python library that builds a tree index of long documents and has an LLM reason through it to retrieve answers, without a vector database or chunking.
HarnessAFreshness: A★ 39.6K↓ 43.6K/wk - 0.697score
Agently
AgentEra
AI application runtime framework for backends with structured outputs, observable actions, MCP capabilities and recoverable workflows.
HarnessAFreshness: A★ 1.7K↓ 685/wk - 0.696score
Amazon Bedrock AgentCore SDK
AWS
Python SDK for deploying agents to Amazon Bedrock AgentCore, a managed runtime with memory, gateway, tools and observability.
HarnessAFreshness: A★ 780↓ 1.6M/wk - 0.687score
antigravity-sdk-python
google-antigravity
Python SDK for building agents on Google Antigravity and Gemini, with the agent loop handled by the runtime.
HarnessAFreshness: A★ 3.8K↓ 126.5K/wk - 0.685score
OpenAI Agents SDK
OpenAI
Python SDK for multi-agent workflows with handoffs, guardrails, sessions and built-in tracing, usable with OpenAI and other LLMs.
HarnessAFreshness: A★ 30.3K↓ 4.5M/wk - 0.679score
CAMEL
CAMEL-AI
Open-source Python framework for multi-agent systems: agent societies, memory, RAG, code interpreters, synthetic data and large-scale simulation.
HarnessAFreshness: A★ 18K↓ 20.1K/wk - 0.676score
AG2
AG2
Open-source Python framework for AI agents that cooperate on tasks, with human-in-the-loop workflows and multi-agent patterns.
HarnessAFreshness: A★ 5K↓ 39.7K/wk - 0.675score
samples
strands-agents
Sample projects for the Strands Agents SDK, showing how to build agents in Python and TypeScript; not intended for production use.
HarnessAFreshness: A★ 913↓ 8.9M/wk - 0.667score
OGX (formerly Llama Stack)
OGX
OpenAI-compatible agentic API server for inference, vector stores, files and skills, on any model or infrastructure.
HarnessAFreshness: A★ 8.4K↓ 14.2K/wk - 0.667score
judgeval
JudgmentLabs
Python SDK for tracing agents and scoring their traces with prompt-based judges, to find failures in production.
HarnessAFreshness: A★ 1.1K↓ 77.7K/wk - 0.662score
fast-agent
evalstate
CLI-first Python agent framework and coding agent with MCP, A2A and Agent Skills support, live streaming and human input.
HarnessAFreshness: A★ 3.9K↓ 19.5K/wk - 0.662score
attestix
VibeTensor
Python toolkit for signed identities, verifiable credentials and delegated authority for AI agents, with MCP and REST interfaces.
HarnessAFreshness: A★ 839↓ 161/wk - 0.657score
Stirrup
ArtificialAnalysis
Lightweight Python framework and starting template for agents that let the model choose its own approach to each task.
HarnessAFreshness: A★ 667↓ 65.3K/wk - 0.656score
chidori
ThousandBirdsInc
TypeScript agent framework on a Rust runtime, where runs are checkpointed, replayed with zero LLM calls and resumed after a crash.
HarnessAFreshness: A★ 1.4K↓ 62/wk - 0.655score
python-utcp
universal-tool-calling-protocol
Official Python implementation of the Universal Tool Calling Protocol, calling HTTP, CLI, MCP and text-file tools through plugins.
HarnessBFreshness: B★ 653↓ 1.9K/wk - 0.650score
agent-governance-toolkit
microsoft
Policy enforcement, identity, sandboxing and reliability tooling for autonomous AI agents, installable with one pip command.
HarnessAFreshness: A★ 6.5K↓ 28.3K/wk - 0.650score
Griptape
Griptape
Python framework for generative AI agents, pipelines and parallel workflows, with RAG engines, tools, memory and swappable drivers.
HarnessAFreshness: A★ 2.6K↓ 10.7K/wk - 0.650score
txtai
NeuML
All-in-one Python AI framework for embeddings-based semantic search, LLM pipelines, workflows and agents.
HarnessAFreshness: A★ 13K↓ 3.3K/wk - 0.648score
kagent
kagent (CNCF)
Kubernetes-native framework and runtime for building and running AI agents as Kubernetes custom resources.
HarnessAFreshness: A★ 4.1K - 0.648score
Atomic Agents
Eigenwise
Lightweight Python framework for composing AI agents and tools as small, typed pieces built on Instructor and Pydantic.
HarnessAFreshness: A★ 6.3K↓ 4.6K/wk - 0.646score
Patter
PatterAI
Python and TypeScript SDK that gives an AI agent a phone number, with pluggable LLM, speech and telephony providers.
HarnessAFreshness: A★ 1.1K↓ 39/wk - 0.644score
Marvin
Prefect
Python framework for structured LLM outputs and agentic workflows built from tasks, agents and threads.
HarnessBFreshness: B★ 6.2K↓ 61.8K/wk - 0.643score
ART
OpenPipe
Open-source reinforcement learning framework that trains LLM agents on multi-step tasks using GRPO.
HarnessAFreshness: A★ 10.8K↓ 2.5K/wk - 0.642score
Swarms
Swarms
Python framework for orchestrating multiple LLM agents in sequential, concurrent, hierarchical and graph-based workflows.
HarnessAFreshness: A★ 7.3K↓ 3.3K/wk