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 1–3 of 3
| Name | Language | Stars | Downloads / month (approx.) | MCP | A2A | Multi-agent |
|---|---|---|---|---|---|---|
| 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 | — |
| 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 |
| Semantic Kernel for Java Java SDK for calling LLMs such as OpenAI, Azure OpenAI and Hugging Face, with plugins that chain functions and planners. | Java | 276 | — | Not stated | Not stated | — |