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 1–4 of 4
| Name | Language | Stars | Downloads / month (approx.) | MCP | A2A | Multi-agent |
|---|---|---|---|---|---|---|
| LangChain.js JavaScript and TypeScript framework of interoperable components for building LLM apps and agents, with LangGraph.js and Deep Agents above it. | TypeScript, JavaScript | 18.3K | — | Not stated | Not stated | — |
| 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 | — |
| lix Embeddable version control system for files and SQL tables, with branch, diff, merge and rollback across both. | JavaScript, Rust | 771 | ~2.4M | Not stated | Not stated | — |
| KaibanJS JavaScript framework for multi-agent teams whose tasks move across a Kanban-style board you can watch. | JavaScript | 1.5K | — | Not stated | Not stated | Yes |