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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.

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Showing 25–48 of 117

NameLanguageStarsDownloads / month (approx.)MCPA2AMulti-agent
AgentScope

Python agent framework from Alibaba that lets the model drive tool use, with team pipelines, MCP, agent skills, A2A, memory and tracing.

Python33.8K~218.1KBuilt inBuilt inYes
PageIndex

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.

Python39.6K~186.8KNot statedNot stated—
Agently

AI application runtime framework for backends with structured outputs, observable actions, MCP capabilities and recoverable workflows.

Python1.7K~2.9KBuilt inNot stated—
Amazon Bedrock AgentCore SDK

Python SDK for deploying agents to Amazon Bedrock AgentCore, a managed runtime with memory, gateway, tools and observability.

Python780~6.9MBuilt inNot stated—
notte

Browser infrastructure for AI agents: local and cloud Playwright-based browser sessions, scraping and deployable browser functions.

Python, JavaScript, TypeScript2K~2.6KVia adapterNot stated—
metorial

Open-source access layer that connects AI agents to 1200+ integrations with shared auth, permissions and audit logs.

TypeScript, JavaScript, Python3.4K~1KBuilt inNot stated—
TEN Framework

Open-source framework for real-time multimodal conversational AI, with RTC and WebSocket voice assistant examples.

Python11.2K—Not statedNot stated—
antigravity-sdk-python

Python SDK for building agents on Google Antigravity and Gemini, with the agent loop handled by the runtime.

Python3.8K~542.2KNot statedNot stated—
OpenAI Agents SDK

Python SDK for multi-agent workflows with handoffs, guardrails, sessions and built-in tracing, usable with OpenAI and other LLMs.

Python30.3K~19.3MBuilt inNot statedYes
CAMEL

Open-source Python framework for multi-agent systems: agent societies, memory, RAG, code interpreters, synthetic data and large-scale simulation.

Python18K~86.2KNot statedNot statedYes
AG2

Open-source Python framework for AI agents that cooperate on tasks, with human-in-the-loop workflows and multi-agent patterns.

Python5K~170.3KNot statedNot statedYes
samples

Sample projects for the Strands Agents SDK, showing how to build agents in Python and TypeScript; not intended for production use.

Python, TypeScript913~38.1MNot statedNot stated—
nixtla

Python SDK for TimeGPT, a time series foundation model for forecasting and anomaly detection.

Python4K~120.9KNot statedNot stated—
OGX (formerly Llama Stack)

OpenAI-compatible agentic API server for inference, vector stores, files and skills, on any model or infrastructure.

Python8.4K~60.7KBuilt inNot stated—
judgeval

Python SDK for tracing agents and scoring their traces with prompt-based judges, to find failures in production.

Python1.1K~332.9KNot statedNot stated—
fast-agent

CLI-first Python agent framework and coding agent with MCP, A2A and Agent Skills support, live streaming and human input.

Python3.9K~83.5KBuilt inBuilt inYes
attestix

Python toolkit for signed identities, verifiable credentials and delegated authority for AI agents, with MCP and REST interfaces.

Python, JavaScript, Go, Java839~690Built inNot stated—
Stirrup

Lightweight Python framework and starting template for agents that let the model choose its own approach to each task.

Python, TypeScript667~279.7KBuilt inNot stated—
chidori

TypeScript agent framework on a Rust runtime, where runs are checkpointed, replayed with zero LLM calls and resumed after a crash.

TypeScript, Python1.4K~266Not statedNot stated—
python-utcp

Official Python implementation of the Universal Tool Calling Protocol, calling HTTP, CLI, MCP and text-file tools through plugins.

Python653~8.1KVia adapterNot stated—
agent-governance-toolkit

Policy enforcement, identity, sandboxing and reliability tooling for autonomous AI agents, installable with one pip command.

Python, TypeScript, C#6.5K~121.3KNot statedNot statedYes
Griptape

Python framework for generative AI agents, pipelines and parallel workflows, with RAG engines, tools, memory and swappable drivers.

Python2.6K~46KBuilt inNot statedYes
txtai

All-in-one Python AI framework for embeddings-based semantic search, LLM pipelines, workflows and agents.

Python13K~14.3KBuilt inNot statedYes
kagent

Kubernetes-native framework and runtime for building and running AI agents as Kubernetes custom resources.

Go, Python4.1K—Built inBuilt inYes

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