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 1–5 of 5
| Name | Language | Stars | Downloads / month (approx.) | MCP | A2A | Multi-agent |
|---|---|---|---|---|---|---|
| AutoGen Archived Microsoft Python framework for multi-agent apps; Microsoft directs new users to Microsoft Agent Framework. | Python | 61.5K | ~381.3K | Via adapter | Not stated | Yes |
| BrowserGym Gym-style Python environment for building and evaluating web agents on MiniWoB, WebArena, WorkArena and other benchmarks. | Python | 1.4K | ~14.5K | Not stated | Not stated | — |
| AgentLab Framework for developing, evaluating and benchmarking web agents on BrowserGym benchmarks, with parallel runs through Ray. | Python | 657 | ~1.2K | Not stated | Not stated | — |
| Stately Agent XState library where agent logic is a state machine, so a model can only pick events the machine allows. | TypeScript | 484 | — | Not stated | Not stated | Yes |
| OpenAI Swarm Experimental Python library that teaches agent handoffs on the Chat Completions API; OpenAI now points users to its Agents SDK. | Python | 22.1K | — | Not stated | Not stated | Yes |