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
| 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 | — |
| 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 |
| Claude Agent SDK (Python) Python SDK that runs the Claude Code agent loop inside your own program, with custom tools and hooks written as Python functions. | Python | 8.3K | ~34M | Built in | 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 |
| fast-agent CLI-first Python agent framework and coding agent with MCP, A2A and Agent Skills support, live streaming and human input. | Python | 3.9K | ~83.5K | Built in | Built in | Yes |
| attestix Python toolkit for signed identities, verifiable credentials and delegated authority for AI agents, with MCP and REST interfaces. | Python, JavaScript, Go, Java | 839 | ~690 | Built in | Not stated | — |
| 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 | — |
| Vision-Agents Python framework for real-time voice and vision agents that process video with pluggable models and processors over WebRTC. | Python | 8.2K | ~1.8K | Built in | Not stated | — |
| ADK for Java Code-first Java toolkit for building and testing AI agents, with multi-agent hierarchies, a dev UI and Maven packages. | Java | 1.8K | — | Built in | Built in | Yes |
| Swiftide Rust framework with an agent harness, typed task graphs and streaming indexing and RAG pipelines for LLM applications. | Rust | 795 | ~806 | Built in | Not stated | — |
| Julep Python framework for durable AI agents built as dataflows that resume after crashes, retry safely and record each step. | Python | 6.6K | ~1.6K | Built in | 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 |
| LightAgent Python agent framework for OpenAI-compatible agents with tools, memory, MCP connections, multi-agent collaboration and workflows. | Python | 1.2K | ~261 | Built in | Not stated | 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 |
| Qwen-Agent Python framework for LLM applications built on Qwen models, with function calling, MCP, a code interpreter and RAG options. | Python | 17.2K | ~90K | Built in | Not stated | — |
| Upsonic Python framework for autonomous agents that work in a sandboxed workspace, and task agents with tools and MCP support. | Python | 8K | ~1K | Built in | Not stated | Yes |
| mcp-agent Python framework for MCP-based agents with composable workflow patterns, MCP server creation and Temporal-backed durable execution. | Python | 8.6K | ~65.2K | Built in | Not stated | Yes |