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 1–16 of 16
| Name | Language | Stars | Downloads / month (approx.) | MCP | A2A | Multi-agent |
|---|---|---|---|---|---|---|
| Strands Agents Open-source Python and TypeScript SDK for model-driven agents, with tools, MCP, multi-agent patterns and streaming. | Python, TypeScript | 8.9K | ~38.1M | Built in | Not stated | Yes |
| 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. | TypeScript | 38.2K | ~1.2M | Built in | Not stated | — |
| Letta Open-source agent harness for stateful agents whose memory persists and improves with use, with a terminal UI, app server and TypeScript SDK. | TypeScript | 25.2K | ~174.5K | Not stated | Not stated | — |
| trueforge Open-source agent harness that runs the model loop for you, with MCP tools, skills, sandboxing, approvals and a chat UI. | TypeScript | 6.4K | — | Built in | Not stated | Yes |
| LangChain.js JavaScript and TypeScript framework of interoperable components for building LLM apps and agents, with LangGraph.js and Deep Agents above it. | TypeScript, JavaScript | 18.3K | — | Not stated | Not stated | — |
| Claude Agent SDK (TypeScript) TypeScript SDK that gives programs Claude Code's built-in tools for reading, editing and running code, installed from npm. | TypeScript | 1.8K | ~34.6M | Not stated | Not stated | — |
| Cloudflare Agents SDK TypeScript SDK for persistent AI agents on Cloudflare Durable Objects, with state sync, scheduling and MCP support. | TypeScript | 5.9K | — | Built in | Not stated | Yes |
| Stirrup Lightweight Python framework and starting template for agents that let the model choose its own approach to each task. | Python, TypeScript | 667 | ~279.7K | Built in | Not 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 | ~121.3K | Not stated | Not stated | Yes |
| standards-sdk TypeScript SDK with reference implementations of Hashgraph Consensus Standards and a Registry Broker client. | TypeScript | 1.3K | ~171 | Not stated | Not stated | — |
| Patter Python and TypeScript SDK that gives an AI agent a phone number, with pluggable LLM, speech and telephony providers. | Python, TypeScript | 1.1K | ~167 | Not stated | Not stated | — |
| agentos TypeScript agent framework with persistent cognitive memory, multi-agent orchestration and one dispatch interface across 13 LLM providers. | TypeScript | 681 | ~56.2K | Not stated | Not stated | Yes |
| Deep Agents (JavaScript) The batteries included agent harness. | TypeScript | 1.6K | — | Not stated | Not stated | — |
| dexto Open agent harness for AI applications, with a YAML-configured coding agent, sessions, tools, MCP support and a CLI. | TypeScript | 657 | — | Built in | Not stated | Yes |
| Bindu Python platform that gives agents a cryptographic identity, A2A communication and x402 payment requirements behind one bindufy() call. | Python, TypeScript, Kotlin | 10K | ~446 | Not stated | Built in | Yes |
| Inngest AgentKit Framework for AI agents and multi-agent networks where a router picks which agent runs, with tools and MCP support. | TypeScript | 956 | ~52K | Built in | Not stated | Yes |