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 |
|---|---|---|---|---|---|---|
| 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 |
| 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 |
| 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 |