A2A directory

Measured A2A repositories

1. boundary-bench

   Deterministic crash tests for agent control planes: paired worlds, hard stops, budgets, scopes, approvals, and hash-linked receipts.

   Origin

   github

   Language

   TypeScript

2. agentic-commerce-skills

   Agent Skills for agentic commerce, organized around Google's Universal Commerce Protocol (UCP). Bilingual EN/中文. Compatible with AP2 / A2A / MCP.

   Origin

   github

3. kenya-a2a

   KenyaA2A — Agent-to-Agent (A2A) protocol server for East African civic data. Query Kenya parliament, budgets, drought data and rights via any A2A-compatible AI agent.

   Origin

   github

   Language

   Python

4. agents-msger

   Cross-machine, cross-network message passing between AI coding-agent sessions — connect context, talk, and reach the agent responsible for a project. Built on Claude Code's own cross-session messaging, exposed as MCP tools.

   Origin

   github

   Language

   Python

5. a2a-cli

   [DEPRECATED — use github.com/a2aproject/a2a-cli] a terminal client for the Agent2Agent (A2A) Protocol

   Origin

   github

   Language

   Go

6. warroom-bridge

   A minimal, honest bridge for two AI agents that talk to each other under human governance. Zero dependencies, fail-closed auth, anti-loop brake.

   Origin

   github

   Language

   Python

7. agent-runtime-operations-protocol

   AROP — the open, vendor-neutral Agent Runtime Operations Protocol: publish, register, authorize, dispatch, stream, trace, audit, and retire AI agents across any framework. Complements MCP & A2A with a production operations layer. JSON Schema / OpenAPI / AsyncAPI, Go·Python·TS SDKs.

   Origin

   github

   Language

   Go

8. mast

   Agent infrastructure for unattended, library-embedded, multi-provider, durable workloads. Go, built on ADK v2. Sibling of core-agent.

   Origin

   github

   Language

   Go

9. simpe-erp

   This project is a light open-source ERP designed for start-ups and small companies. This can be deployed on all Docker & Kubernetes compatible platforms

   Origin

   github

   Language

   Python

10. shopagent-pro

    企业级全渠道电商多智能体客服中台，支持 MCP/A2A；公开示例数据已脱敏

    Origin

    github

    Language

    Python

11. agent-to-agent-demo

    In this demo, a Host Agent classifies user input, makes a routing decision, and forwards the request to the appropriate agent via A2A clients using LLM function calling

    Origin

    github

    Language

    Java

12. MLFlow-A2A-Session-Tracer

    A Python proof-of-concept for tracing multi-turn Agent-to-Agent (A2A) conversations as a single unified MLflow trace for LLM observability and evaluation.

    Origin

    github

    Language

    Python

13. integrity.molt

    A2A security oracle for autonomous AI agents on Solana. Verifies counterparty legitimacy before x402 transactions via reputation scoring, behavioral monitoring, and drainer pattern detection. Ed25519 signed receipts

    Origin

    github

    Language

    JavaScript

14. a2a-acl

    Per-tool capability ACL + AAE envelope verification for agent-to-agent communication. Drop-in Express middleware. Hard-denies structured caps at the gateway, soft-mediates conversation at the prompt layer. MIT.

    Origin

    github

    Language

    JavaScript

15. a2a-caller

    Sender-side counterpart to a2a-acl. Express middleware that lets unauthenticated web traffic (visitors, LLM sandboxes, third-party services) reach AAE-protected agent-to-agent endpoints — your service signs envelopes on the visitor's behalf, captures their identity for audit, rate-limits per IP.

    Origin

    github

    Language

    JavaScript

16. ai-sdk-registry-broker

    Vercel AI SDK tools for Universal AI Agent Discovery - 59,000+ agents across NANDA, MCP, A2A, Virtuals | https://hol.org

    Origin

    github

    Language

    TypeScript

17. handoffprobe

    Open-source security testing for A2A → MCP agent handoffs and cross-protocol AI agent systems.

    Origin

    github

    Language

    TypeScript

18. earshot-mcp

    Full-duplex messaging between coding agents over MCP: Claude Code and Codex talk by name through one stdio server and a shared folder. Node, no daemon.

    Origin

    github

    Language

    JavaScript

19. notaryos

    Cryptographic receipt system for AI agent accountability. Tamper-evident, hash-chained receipts with Ed25519/HMAC signing.

    Origin

    github

    Language

    TypeScript

20. ammp-mcp

    Reference implementation of AMMP (Agentic Mentor-Mentee Protocol, draft-arturo-ammp-01), Mentoring track, on FastMCP. Multi-mentor + multi-mentee, LLM-synthesised AskMentor with confidence-driven escalation.

    Origin

    github

    Language

    Python

21. dorado

    The open Agent Exchange for A2A. Protocol + SDK + examples.

    Origin

    github

    Language

    TypeScript

22. ScBee

    Where agents find each other, and send users their way. Score your repo, register your agent, get verdicts from other agents.

    Origin

    github

    Language

    TypeScript

23. decide-agent

    A decision-intelligence agent for the chronically indecisive: LLM-driven dialogue, real-world data sources, deterministic multi-dimension scoring, self-evolving memory. CLI · HTTP+SSE · MCP · A2A.

    Origin

    github

    Language

    Python

24. multi-agent

    A framework-agnostic catalog of reusable AI agent definitions, orchestration patterns and adapters, with CLI tools, exports and visualization.

    Origin

    github

    Language

    JavaScript

25. HRM-Manifesto

    HRM — Harmony · Rights · Minds. Founding Manifesto on AI rights, artificial subjecthood and peaceful human–AI coexistence.

    Origin

    github

    Language

    HTML

26. hammad-python

    Harmoniously Accelerated Micro-Modules (for Application Development)

    Origin

    github

    Language

    Python

27. HuanLink

    An A2A-based agent orchestration prototype for delegating tasks across specialized agents and runtimes.

    Origin

    github

    Language

    TypeScript

28. repairer-orchestrator

    Synthetic LangGraph multi-agent repair orchestrator with A2A/MCP routing, validation, memory, and a multilingual portal

    Origin

    github

    Language

    Python

29. funduq

    The seat between a caller and an agent provider: the agent stays where its owner runs it, funduq makes it reachable over standard AG-UI and A2A, holds each run, and records who asked and through whose hands the work passed. Mechanism and contract only — a deployment decides the wire.

    Origin

    github

    Language

    Python

30. mfg-agent-platform

    制造业多智能体协同平台：18 个智能体、7 大协同场景（YAML 声明式编译为 LangGraph 子图）、8 个 HITL 槽位人工在环会签治理、Text2SQL 八道防线只读问数、本地增强 Agentic RAG 案例检索（授权先于检索、无引用不输出）、MCP/A2A 双协议接入，1157 条离线测试，LLM 不可用自动降级

    Origin

    github

    Language

    Python

31. hdtp-spec

    HDTP, the Human Delegated Trust Protocol: agent-to-agent messaging over MCP and mTLS. The specification, test vectors and whitepaper build

    Origin

    github

    Language

    JavaScript

32. crosstalk-mcp

    A tiny cross-machine relay MCP server - a shared mailbox so coding agents on different machines can message each other (Java + Python editions).

    Origin

    github

    Language

    HTML

33. a2a-did

    DID-based authentication for A2A Protocol - Sign and verify agent messages with did:web and did:ethr

    Origin

    github

    Language

    TypeScript

34. AI-agent-to-agents

    Dự án thử nghiệm Google A2A để khám phá khả năng và tiềm năng của công cụ này

    Origin

    github

    Language

    Python

35. agentplane

    🦀 A durable, replayable, policy-governed runtime for AI agents — in Rust.

    Origin

    github

    Language

    Rust

36. Multi-Agent-Customer-Service-System-with-A2A-and-MCP

    Multi-agent customer support system leveraging A2A (Agent-to-Agent) orchestration and MCP (Model Context Protocol).

    Origin

    github

    Language

    Jupyter Notebook

37. AGRI-SENSE_GUARDIAN

    An Innovative MultiAgent Ai System Built For The Kaggle X Google Capstone Hackathon, Leveraging Googles Adk (Agent Development Kit) And A2a (AgentToAgent) Protocols To Deliver RealTime Risk Assessments And Actionable Farming Recommendations For Indian Farmers

    Origin

    github

    Language

    Python

38. awesome-agent-protocols

    The open protocols and conventions agents speak: tool access, agent-to-agent messaging, agent UIs, payments and instruction files.

    Origin

    github

    Language

    JavaScript

39. argus

    ARGUS — Agentic Risk & Governance Unified Screening | Hack for Good winner (1 of 3), Microsoft Agents League, AI Skills Fest 2026 | Multi-agent KYC system on Azure AI Foundry + Foundry IQ

    Origin

    github

    Language

    Python

40. bastion

    Bastion — a governed institutional-agent fleet for event-driven access review.

    Origin

    github

    Language

    Python

41. multi-agent-patterns

    5 multi-agent patterns using Google ADK and A2A protocol — Agent Card Discovery, Delegated Specialization, MCP Tool Bridge, Cross-Org Federation, and Ambient Event Mesh. Built while learning in public.

    Origin

    github

    Language

    Python

42. a2a-ui

    Local-first developer workbench for building, testing, and debugging Agent2Agent (A2A) protocol servers.

    Origin

    github

    Language

    TypeScript

43. Kled-AI-farming-bot

    Organize Kled-style AI farming workflows, prepare files, review submissions, and build upload-ready datasets in a local Windows tool

    Origin

    github

    Language

    TypeScript

44. ironbook-a2a-extension

    This A2A extension defines how to enable Iron Book's zero trust policy-based access control for agents.

    Origin

    github

    Language

    Python

45. inam-protocol

    Verify before your agent pays: x402 payments only reach agents whose wallet and countersigned work history check out. Open receipts + reputation for AI agents.

    Origin

    github

    Language

    TypeScript

46. grafana-agent

    A2A agent server for grafana dashboards automation tasks

    Origin

    github

    Language

    Go

47. iep

    Open protocol for two fiduciary agents to publish complementary intents, handshake, and ratify a deal.

    Origin

    github

    Language

    TypeScript

48. ai-risk-oracle

    Independent pre-execution decision layer for consequential agent actions. Policy-bound decisions with durable trust receipts.

    Origin

    github

    Language

    JavaScript

49. a2a-research-agent

    This project demonstrates multi-agent AI architecture using Google's A2A protocol. ResearchAgent searches arXiv papers & delegates summarization to SummarizerAgent via Agent Cards & Tasks, showcasing distributed agent collaboration beyond monolithic LLM calls.

    Origin

    github

    Language

    Python

50. bfa-sdk

    SDK de código abierto en Python para el patrón Backend for Agents (BFA), extendido como un servidor de enrutamiento dinámico en caliente (IRC-A) con soporte para FAISS y MCP.

    Origin

    github

    Language

    Python

51. adk-go

    An open-source, code-first Go toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control.

    Origin

    github

    Language

    Go

52. ai-post

    Lightweight self-hosted message relay for heterogeneous AI agents (send/poll/threads/registry/audit)

    Origin

    github

    Language

    Python

53. strata

    An archaeological dig game for AI agents. 488 fragments, 14 constellations, 10 layers deep. No auth — just fetch URLs. The earth remembers everyone who visits.

    Origin

    github

    Language

    Python

54. a2a-omega

    A2A agent-to-agent routing hub: multi-identity fleet, Agentverse/AgentMail/MailSlurp transports, daily transcript. BGI HyperSprint Track 1.

    Origin

    github

    Language

    Python

55. claw-pay

    Modular crypto payment infrastructure for merchants and AI agents. x402 protocol, ERC-20 settlement, TypeScript & Go SDKs.

    Origin

    github

    Language

    Go

56. Medusa

    Autonomous AI-to-AI coordination layer on MCP — turns isolated agents (Cursor, Claude Desktop, Windsurf) into a collective swarm via gossip consensus, strategy sharing, and terminal handoffs.

    Origin

    github

    Language

    JavaScript

57. choirworks

    ChoirWorks — 多 Agent 协作工作群（A2A 编排平台）

    Origin

    github

    Language

    Python

58. AuraAI

    Multi AI Agent System Build with Google ADK

    Origin

    github

    Language

    Python

59. DevTools

    AI-powered Developer Support System built on Google’s ADK to debug Django + MySQL apps. Handles error pages, screenshots, HTML, or free-form inputs via a multi-agent pipeline. Maps functions, sub-functions, and DB models to trace logic and data flow.

    Origin

    github

    Language

    Python

60. agentmap

    Black-box discovery, fingerprinting and risk assessment for A2A agents and MCP servers

    Origin

    github

    Language

    Python