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 1–18 of 18
- 0.851score
Strands Agents
AWS
Open-source Python and TypeScript SDK for model-driven agents, with tools, MCP, multi-agent patterns and streaming.
HarnessAFreshness: A★ 8.9K↓ 8.9M/wk - 0.831score
CopilotKit
CopilotKit
Open-source SDK that connects AI agents to app front ends with chat UI, generative UI, shared state and human approvals; creator of the AG-UI protocol.
HarnessAFreshness: A★ 38.2K↓ 286.2K/wk - 0.787score
trueforge
truefoundry
Open-source agent harness that runs the model loop for you, with MCP tools, skills, sandboxing, approvals and a chat UI.
HarnessAFreshness: A★ 6.4K - 0.730score
Claude Agent SDK (Python)
Anthropic
Python SDK that runs the Claude Code agent loop inside your own program, with custom tools and hooks written as Python functions.
HarnessAFreshness: A★ 8.3K↓ 7.9M/wk - 0.673score
Cloudflare Agents SDK
Cloudflare
TypeScript SDK for persistent AI agents on Cloudflare Durable Objects, with state sync, scheduling and MCP support.
HarnessAFreshness: A★ 5.9K - 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 - 0.615score
Vision-Agents
GetStream
Python framework for real-time voice and vision agents that process video with pluggable models and processors over WebRTC.
HarnessAFreshness: A★ 8.2K↓ 418/wk - 0.601score
ADK for Java
Google
Code-first Java toolkit for building and testing AI agents, with multi-agent hierarchies, a dev UI and Maven packages.
HarnessAFreshness: A★ 1.8K - 0.575score
Swiftide
Bosun
Rust framework with an agent harness, typed task graphs and streaming indexing and RAG pipelines for LLM applications.
HarnessAFreshness: A★ 795↓ 188/wk - 0.571score
Julep
Julep AI
Python framework for durable AI agents built as dataflows that resume after crashes, retry safely and record each step.
HarnessBFreshness: B★ 6.6K↓ 368/wk - 0.568score
dexto
truffle-ai
Open agent harness for AI applications, with a YAML-configured coding agent, sessions, tools, MCP support and a CLI.
HarnessAFreshness: A★ 657 - 0.566score
LightAgent
wanxingai
Python agent framework for OpenAI-compatible agents with tools, memory, MCP connections, multi-agent collaboration and workflows.
HarnessAFreshness: A★ 1.2K↓ 61/wk - 0.549score
Inngest AgentKit
Inngest
Framework for AI agents and multi-agent networks where a router picks which agent runs, with tools and MCP support.
HarnessCFreshness: C★ 956↓ 12.1K/wk - 0.525score
Qwen-Agent
Alibaba Qwen
Python framework for LLM applications built on Qwen models, with function calling, MCP, a code interpreter and RAG options.
HarnessDFreshness: D★ 17.2K↓ 21K/wk - 0.518score
Upsonic
Upsonic
Python framework for autonomous agents that work in a sandboxed workspace, and task agents with tools and MCP support.
HarnessCFreshness: C★ 8K↓ 244/wk - 0.514score
mcp-agent
LastMile AI
Python framework for MCP-based agents with composable workflow patterns, MCP server creation and Temporal-backed durable execution.
HarnessDFreshness: D★ 8.6K↓ 15.2K/wk