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 1–12 of 12
| Name | Language | Stars | Downloads / month (approx.) | MCP | A2A | Multi-agent |
|---|---|---|---|---|---|---|
| ADK for TypeScript TypeScript toolkit for agents with Zod-typed tools, graph and multi-agent workflows, and Node.js or browser runtimes. | TypeScript | 1.4K | ~615.1K | Built in | Built in | Yes |
| atmosphere Java runtime for AI agents that streams tokens and tool events over WebSocket, SSE or gRPC, with human approvals. | Java | 3.8K | — | Built in | Built in | Yes |
| PraisonAI Python framework for multi-agent teams and workflows, with a CLI and Docker, MCP and A2A deployment options. | Python, JavaScript | 9.3K | ~19.8K | Built in | Built in | Yes |
| BeeAI Framework Python and TypeScript framework for multi-agent systems, with MCP and A2A interop, YAML orchestration and OpenTelemetry tracing. | Python, TypeScript | 3.4K | ~23.3K | Built in | Built in | Yes |
| Agno Python framework and runtime for building agents, serving them over a REST API and MCP server, and managing them from a web control plane. | Python | 42.9K | ~2.2M | Built in | Built in | Yes |
| Spring AI Alibaba Java framework for agentic, workflow and multi-agent AI apps, with graph workflows, MCP and A2A support. | Java | 11.1K | — | Built in | Built in | Yes |
| AgentScope Python agent framework from Alibaba that lets the model drive tool use, with team pipelines, MCP, agent skills, A2A, memory and tracing. | Python | 33.8K | ~218.1K | Built in | Built in | 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 |
| kagent Kubernetes-native framework and runtime for building and running AI agents as Kubernetes custom resources. | Go, Python | 4.1K | — | Built in | Built in | Yes |
| tRPC-Agent-Go Go framework for multi-agent systems with graph workflows, tools, session memory, MCP, A2A, AG-UI and OpenTelemetry. | Go | 1.9K | — | Built in | Built in | Yes |
| 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 |
| any-agent Python interface for running and evaluating agents from several frameworks, with OpenTelemetry traces; now in soft deprecation. | Python | 1.3K | ~2.7K | Built in | Built in | Yes |