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 1–6 of 6
| Name | Language | Stars | Downloads / month (approx.) | MCP | A2A | Multi-agent |
|---|---|---|---|---|---|---|
| ADK for Go Code-first Go toolkit for building agents with a tool ecosystem, composable multi-agent systems and Cloud Run deployment. | Go | 8.9K | — | Built in | Not stated | Yes |
| Google Agent Development Kit (ADK) Open-source toolkit for building, evaluating and deploying agents in Python, TypeScript, Go, Java and Kotlin, tuned for Gemini but model-agnostic. | Python, TypeScript, Go, Java, Kotlin | 22K | ~10.1M | Built in | Not stated | 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 | — |
| 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 |
| Agent SDK Go Go framework for AI agents with memory, tool execution, MCP, agent skills, multi-agent patterns and evaluation. | Go | 640 | — | Built in | Not stated | Yes |