AI agent tools for A2A (agent-to-agent)
Short answer: Our top pick for A2A (agent-to-agent): OmniRoute, with the highest AgentPick Score (92/100) among tools tagged "a2a". Runners-up: adk-go (82) and ag2 (80). Compare what each does, its license and how recently it was updated below.
| # | Tool | What it does | Score | Stars | License | Updated |
|---|---|---|---|---|---|---|
| #1 | OmniRoute | Never stop coding. Free MIT AI gateway: one endpoint, 359 providers (150+ free), 1200+ models Kimi, Claude, GPT, Gemini, GLM, DeepSeek, MiniMax. Works… | 92/100 | ★ 77k | MIT | 14 Oct 2026 |
| #2 | adk-go | An open-source, code-first Go toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control. | 82/100 | ★ 8.9k | Apache-2.0 | 14 Oct 2026 |
| #3 | ag2 | AG2 (formerly AutoGen): The Open-Source AgentOS.Join us at: https://discord.gg/sNGSwQME3x | 80/100 | ★ 5k | Apache-2.0 | 14 Oct 2026 |
| #4 | fast-agent | Code, Build and Evaluate agents - excellent Model and Skills/MCP/ACP/A2A Support | 78/100 | ★ 3.9k | Apache-2.0 | 14 Oct 2026 |
| #5 | atmosphere | Portable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic, or 9 more behind one SPI. Token streaming, tool cal… | 78/100 | ★ 3.8k | Apache-2.0 | 14 Oct 2026 |
| #6 | archestra | Enterprise AI Platform with guardrails, MCP registry, gateway & orchestrator | 76/100 | ★ 4.4k | See repo | 14 Oct 2026 |
| #7 | evolver | The GEP-powered self-evolving engine for AI agents. Auditable evolution with Genes, Capsules, and Events. | evomap.ai | 72/100 | ★ 8.7k | GPL-3.0 | 30 Sept 2026 |
| #8 | Agentlas-OS | Agent OS: keep specialist agents in a hub, spin up a temporary orchestrator per task. Local-first, works with any model. | 69/100 | ★ 1.6k | Apache-2.0 | 14 Oct 2026 |
| #9 | mcp-gateway-registry | Enterprise-ready MCP Gateway & Registry that centralizes AI development tools with secure OAuth authentication, dynamic tool discovery, and unified ac… | 69/100 | ★ 981 | Apache-2.0 | 14 Oct 2026 |
| #10 | trpc-agent-go | A Go framework for building production agent systems with graph workflows, tools, memory, A2A, AG-UI, MCP, evaluation, and observability. | 68/100 | ★ 1.9k | Apache-2.0 | 14 Oct 2026 |
| #11 | LLMTornado | The .NET library to build AI agents with 30+ built-in connectors. | 68/100 | ★ 645 | MIT | 12 Oct 2026 |
| #12 | aura | AURA is a production-tested SRE agent platform you can deploy in minutes. AURA handles the guardrails, APIs, state management, streaming, and failure … | 66/100 | ★ 398 | Apache-2.0 | 14 Oct 2026 |
| #13 | Deuz-SDK | TypeScript AI SDK and agent framework with zero dependencies. Build production AI agents and multi-agent swarms: durable execution, long-term memory, … | 65/100 | ★ 682 | MIT | 13 Oct 2026 |
| #14 | EDDI | Config-driven engine that turns JSON into production-grade AI agents. Multi-agent orchestration, 12+ LLM providers, MCP/A2A protocols, RAG, persistent… | 64/100 | ★ 384 | Apache-2.0 | 14 Oct 2026 |
| #15 | agentenv-framework | Creating realistic RL environments requires collaboration between researchers, engineers, and domain experts across many dimensions: artifacts, enviro… | 64/100 | ★ 297 | Apache-2.0 | 14 Oct 2026 |
| #16 | Bindu | Bindu: The identity, communication, and payments layer for AI agents. | 62/100 | ★ 10k | See repo | 6 Sept 2026 |
| #17 | nautilus-compass | Open memory & reliability layer for AI agents + independent judging/verification (NACRE judge, caliber-bench meta-benchmark, preregistered criteria) —… | 61/100 | ★ 1.3k | See repo | 14 Oct 2026 |
| #18 | nuwax | Nuwax Agent OS - An enterprise-grade AI Agent Development and Operation Platform - Providing a complete solution for agent creation and distribution, … | 58/100 | ★ 893 | Apache-2.0 | 14 Oct 2026 |
| #19 | AgentHound | Offensive security framework for AI agent infrastructure - recon, credential looting, model exfiltration, poisoning, and attack-path analysis across M… | 53/100 | ★ 450 | Apache-2.0 | 14 Oct 2026 |
| #20 | sprix-sage-router | Sprix AI at 屿智同行 — state-aware SELF/COLLABORATE/HANDOFF routing for A2A agent networks. | 50/100 | ★ 3.6k | MIT | 28 Aug 2026 |
| #21 | ovo | Agent behavior that compiles | 47/100 | ★ 568 | Apache-2.0 | 7 Oct 2026 |
| #22 | internet-court-skill | The trust layer for agent-to-agent commerce — natural-language mandates, ERC-7710 delegated permissions, x402 payments, escrow, and dispute resolution… | 46/100 | ★ 6.7k | See repo | 19 Aug 2026 |
| #23 | any-agent | A single interface to use and evaluate different agent frameworks | 45/100 | ★ 1.2k | Apache-2.0 | 1 Oct 2026 |
| #24 | agentscope-runtime | A production-ready runtime framework for agent apps with secure tool sandboxing, Agent-as-a-Service APIs, scalable deployment, full-stack observabilit… | 45/100 | ★ 876 | Apache-2.0 | 4 Jun 2026 |
| #25 | AI-Gateway | Labs to explore AI Models, MCP servers, and Agents with the AI Gateway powered by Azure API Management and Microsoft Foundry 🚀 | 43/100 | ★ 996 | MIT | 16 Sept 2026 |
| #26 | smythos-studio | SmythOS Studio: Open-Source Visual AI Agent Builder and deployable runtime stack from SmythOS. Start with an intuitive drag-and-drop workspace, extend… | 27/100 | ★ 646 | MIT | 3 Apr 2026 |
Source: each project's public GitHub repository (description, stars, license, last push). Listed tools aren't tested or ranked by AgentPick.
How to choose
- Grant the narrowest permissions the server allows.
- Check whether it runs locally or calls a remote service.
- Prefer servers listed in the official MCP registry.
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