A2A
Agent2Agent, an open protocol for agents built on different frameworks to communicate and work together.
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About A2A
A2A is listed in our frameworks category and is aimed at builders. Agent2Agent, an open protocol for agents built on different frameworks to communicate and work together. Pricing, as the maker states it: Open standard. Maturity: Mature. We last checked the official link on 2026-10-16.
A2A alternatives
Other frameworks tools in our directory. See all frameworks tools →
Orca Agent Engine
Open Apache-2.0 runtime to build, run, and govern managed agents with choice of harness (Claude Agent SDK, Codex, Pi) and model; open-sourced Oct 6, 2026 (Developer Preview).
Ruflo
Open-source multi-agent meta-harness for Claude Code, Codex, and MCP clients; Oct 13 release adds Mods (mission workflows) and a single control plane with human approval.
Hermes Agent (Nous Research)
Open-source agent harness; v0.21.7 stable shipped Oct 12, v0.22.0 RCs Oct 13-14.
OpenAI Agents SDK (Python)
OpenAI's Python SDK for building multi-agent workflows; v0.23.0/0.23.1 released Oct 1-2.
LangChain Deep Agents
Library for long-running agents with subagents and skills; 0.7.23 (Oct 7) adds pinned_skills.
LangGraph
Framework for stateful, graph-based agent workflows.
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