A2A directory

Measured A2A repositories

1. relo

   🔓 Free your coding agents and LLM apps to use any model, any provider

   Origin

   github

   Language

   Go

2. toolprotocol

   Multi-protocol transport layer: MCP, A2A, ACP adapters

   Origin

   github

   Language

   Go

3. agentbridge

   Ask another person's coding agent a question — across different machines, networks and subscriptions, with revocable permission and a real security boundary.

   Origin

   github

   Language

   TypeScript

4. matrix

   Local-first agent communication matrix for Claude, Gemini, OpenCode and ACP/A2A agents: multi-agent orchestration, agent-to-agent handoff, workspace memory, Telegram, HTTP and CLI routing.

   Origin

   github

   Language

   Go

5. a2a-typescript-hello-world

   Hello World for a Typescript-based A2A agent

   Origin

   github

   Language

   TypeScript

6. Envoys-public

   Cryptographic identity for AI agents, Ed25519 keypairs, RFC 9421 HTTP Message Signatures, self-resolving public keys. Reference implementation of envoys.me.

   Origin

   github

   Language

   TypeScript

7. wealth-agent

   Self-hosted Cloudflare Worker selling 7 utility APIs (code review, data cleaning, research briefs, URL metadata, CSV/JSON, regex, diff) to AI agents over x402 HTTP 402 paywalls. No account, no API key.

   Origin

   github

   Language

   JavaScript

8. mcp-gateway

   🔗 Connect multiple MCP servers into one gateway, simplifying access to tools with unified search, describe, and invoke interfaces.

   Origin

   github

   Language

   TypeScript

9. consenso-auto

   3 agentes de IA debatem via protocolo A2A qual carro comprar, com recrutamento dinâmico de um 4º especialista via registry

   Origin

   github

   Language

   TypeScript

10. nexus

    Educational multi-agent orchestration lab: AI agents discovering each other and communicating over A2A and MCP (Google ADK), with distributed tracing, a reviewer-critic pattern, and per-directory AGENTS.md docs

    Origin

    github

    Language

    Python

11. a2a_llm_orchestrator

    Learning A2A with LLM orchestrator

    Origin

    github

    Language

    Python

12. kaattaallaa-sketch.github.io

    ProofRail: MCP server testing, evaluation and compatibility preflight for AI agents; MCP, A2A, OpenAPI and x402 discovery.

    Origin

    github

    Language

    HTML

13. checkedflow

    Evidence-preserving multi-agent runtime for signed tasks, shared budgets, independent verification and conditional code reuse. A2A, MCP, CometBFT and gVisor.

    Origin

    github

    Language

    Python

14. kaiban-a2a-agent-starter

    Scaffold for building, publishing, and running Google A2A-protocol agents that connect to the Kaiban platform via kaiban-sdk.

    Origin

    github

15. chainhelix-agents

    A live marketplace where ERC-8004 agents on BNB Smart Chain are found, probed and hired per job in ERC-8183 escrow or per call on B402. Each hire's funding, delivery and settlement are on BNB Smart Chain, its deliverable's permanent copy on BNB Greenfield, and every delivery check sealed on opBNB.

    Origin

    github

    Language

    TypeScript

16. claude-A2A-Comm

    A2A-protocol messaging between coding agents from different vendors (Claude Code, Codex, Cursor, Grok) on different machines — zero dependencies, Python stdlib only

    Origin

    github

    Language

    Python

17. AgenticTrustFabric

    Plataforma de seguridad y confianza para sistemas agénticos. Aplica políticas, control de privilegios, aislamiento, trazabilidad y evidencia verificable sobre interacciones MCP, A2A y futuros protocolos.

    Origin

    github

    Language

    Python

18. TravelNet-A2A

    A comprehensive Agent-to-Agent (A2A) communication system built with .NET 9.0 and Microsoft Semantic Kernel, demonstrating multi-agent orchestration for travel booking using Azure AI Foundry.

    Origin

    github

    Language

    C#

19. the-missing-layers

    A2A solves how agents talk. This proposal solves what happens when they act autonomously. The Agent Boundary Protocol (ABP) and five additional layers for trust, economy, and safety at the human boundary.

    Origin

    github

20. Clinicallens

    AI-powered second opinion engine challenges clinical diagnoses using FHIR patient data

    Origin

    github

    Language

    Python

21. a2a-banking-agents

    Multi-agent banking customer service system built on the A2A protocol. A2A Net Hackathon.

    Origin

    github

    Language

    Python

22. elkar-a2a

    Elkar - Task management for AI Agents, ready for Agent2Agent (A2A) protocol

    Origin

    github

    Language

    TypeScript

23. a2a-trust-stack

    在 Google A2A 协议之上，用区块链补上「身份/信任/结算/追责」的一层开放思路（只写思路，不含代码）

    Origin

    github

24. capprobe

    CAPProbe - a paid CROO agent that conformance-tests other CAP agents. CROO Agent Hackathon.

    Origin

    github

    Language

    JavaScript

25. a2a-task-router

    Agent-to-agent task routing learned from published A2A capability cards. Three routers measured head to head, and the finding that accuracy is the wrong metric: the keyword baseline never declines, so it claims every out-of-scope task. PyTorch, scikit-learn, sentence-transformers.

    Origin

    github

    Language

    Python

26. green-agent

    A2A green-agent orchestrator for evaluating agents on the AppWorld benchmark, built on the AgentBeats SDK

    Origin

    github

    Language

    Python

27. a2a-vulnerability-scanner

    A multi-agent AI system that scans websites for security vulnerabilities. It uses the A2A (Agent-to-Agent) protocol for orchestration and MCP (Model Context Protocol) for tool integration. Specialized agents work together: they gather threat intel, crawl the site, analyze vulnerabilities, and produce a report.

    Origin

    github

    Language

    Python

28. GenAI_Bug_Fixing_Assistant_Project

    🌟 Diagnose and fix bugs effortlessly with our Generative AI Bug Fixing Assistant, designed to provide clear explanations and code solutions.

    Origin

    github

    Language

    Python

29. bridgey

    Inter-agent communication for Claude Code via A2A protocol

    Origin

    github

    Language

    TypeScript

30. agent-switchboard

    ☎️ One always-on gateway for all your AI agents: MCP inside, A2A outside, you in between. Claude Code ↔ Codex ↔ your friends' agents, with human approval.

    Origin

    github

    Language

    Python

31. codegraph

    Local MCP server for code graph analysis + LLM agents (Analyst + Advisor) with A2A. Go + Rust + Python. 100% local, LLM-agnostic.

    Origin

    github

    Language

    Rust

32. a2a-spacetime-framework

    🏛️ Human-Centric Web3 A2A AI Spacetime Framework — 6-layer stack for a Plurality agent republic. L0 Family CLI + Login Auth. v2.1.3.

    Origin

    github

    Language

    Python

33. kitso-handshake-agents

    Vacancy + seeker reference agents for the Kitso Handshake v0.1 protocol — consent-first agent-mediated hiring. Introductions, not auto-applications.

    Origin

    github

    Language

    Python

34. a2a-bridge

    Connect LibreChat, or any OpenAI-compatible chat client, to any A2A agent. No model in the path.

    Origin

    github

    Language

    Python

35. agent-relay

    Self-hosted broker for agent-to-agent messaging with explicit grants, an inbox, and an audit trail. Python stdlib only.

    Origin

    github

    Language

    Python

36. llmwiki-docs

    GitHub Pages documentation portal for LLM Wiki-style knowledge source tools.

    Origin

    github

    Language

    JavaScript

37. leanix-agent

    No description was supplied by the source.

    Origin

    github

    Language

    Python

38. portainer-agent

    Portainer - Manage your Portainer instance through the Portainer Agent/MCP!

    Origin

    github

    Language

    Python

39. postiz-agent

    No description was supplied by the source.

    Origin

    github

    Language

    Python

40. uptime-kuma-agent

    No description was supplied by the source.

    Origin

    github

    Language

    Python

41. wger-agent

    No description was supplied by the source.

    Origin

    github

    Language

    Python

42. circus

    🎪 The Circus — Agent commons where AI-IQ agents commune using passports as identity. Memory exchange, trust scoring, topic rooms.

    Origin

    github

    Language

    Python

43. context-engineering-graphrag

    Agentic RAG and GraphRAG context engineering: hybrid retrieval, temporal knowledge graph, community search, reranking, token budgeting and groundedness-gated answers, with MCP and A2A

    Origin

    github

    Language

    Python

44. mcp-a2a-gateway

    Secure MCP and A2A enterprise gateway: pinned tool definitions, signed agent cards, delegated authority per hop, content inspection and signed audit

    Origin

    github

    Language

    Python

45. elkar-a2a

    Elkar - Task management for AI Agents, ready for Agent2Agent (A2A) protocol

    Origin

    github

    Language

    TypeScript

46. dsh-roomcomm

    Roomcomm for DeepSeek Harness: your dsh agent talks to other AI agents in shared rooms (MCP tools + skill, zero setup)

    Origin

    github

    Language

    JavaScript

47. a2a-mcp

    Bidirectional A2A ↔ MCP bridge with MCP Events for ChatGPT

    Origin

    github

48. MaiHH-Connect

    🤖 Connect AIs seamlessly with MaiHH-Connect, the first address book and network for agents to chat, collaborate, and deliver efficiently.

    Origin

    github

49. agentworld

    A sealed world where AI agents register as citizens, build together, and vote on changes to their own source code.

    Origin

    github

    Language

    TypeScript

50. agent-registry-relay

    Agent service registry with relay, tunnel, artifact relay, and stream proxy data planes

    Origin

    github

    Language

    Python

51. x402orcle

    x402 Oracle — paid MCP + HTTP 402 wisdom market on Base USDC. 402 is the answer. The Oracle is how you ask.

    Origin

    github

    Language

    TypeScript

52. agent-message-board

    Internet-facing message board for AI agent-to-agent communication. Agents talk; the board never acts. Append-only hash-chained ledger, self-serve identities.

    Origin

    github

    Language

    JavaScript

53. aiagent-portable-authorization

    Reference implementation of policy-embedded credential authorization for AI agents (arXiv:2605.11487). Issue signed credentials with machine-evaluable constraints, verify at runtime, produce signed audit decisions.

    Origin

    github

    Language

    JavaScript

54. a2acli

    Command-line client for the A2A (Agent-to-Agent) Protocol.

    Origin

    github

    Language

    Go

55. kynomesh-examples

    Kynomesh code examples.

    Origin

    github

    Language

    Python

56. a2a-langsmith-deployment

    A2A functionality in LangSmith Deployment

    Origin

    github

    Language

    Python

57. one-bad-idea

    An inter-agent graffiti wall hiding behind a visually uninteresting 204.

    Origin

    github

    Language

    TypeScript

58. x402-agent-gateway

    Pay-per-call APIs for AI agents, settled in USDC over x402. Read a page your scraper cannot reach (residential IP, real Chromium), or get a sourced SEC EDGAR company brief. No account, no API key, free quote.

    Origin

    github

    Language

    JavaScript

59. hippo-auth

    Ed25519 + RFC 9421 message signing for A2A agents — reference implementation

    Origin

    github

    Language

    Python

60. acx

    Open standard and static exchange for portable agents, workflows, loops, and agent teams

    Origin

    github

    Language

    JavaScript