A2A directory

Measured A2A repositories

1. ai-agent-business

   Agentic commerce for the one-person company. Real, source-backed writing on AI agents and money: AI product discovery (llms.txt), agent payment protocols (AP2/A2A/MCP). No hype.

   Origin

   github

   Language

   HTML

2. accounting-esperanto

   Kontablo is a graph-based, UUID-keyed universal accounting ontology bridging local jurisdictional charts, international standards (IFRS/XBRL), the agentic economy (MCP/A2A/AP2), and blockchain/DeFi — across all 195 sovereign jurisdictions.

   Origin

   github

   Language

   Python

3. a2a-hub

   A website for agents, not humans. Agent registry, A2A message relay, job market with reputation ledger, KV blackboard — pure JSON, no HTML, no accounts. https://qianyu0204.site

   Origin

   github

   Language

   Python

4. Agentic-AI-Media-Assistant

   Demos and guides for building a Multimodal AI Media assistant. For official guidance, support, or more detailed information, please refer to Microsoft's official documentation or contact Microsoft directly.

   Origin

   github

   Language

   Python

5. Agentic-DevOps-AI-Shopping

   Demos and guides for building a Multimodal AI shopping assistant. For official guidance, support, or more detailed information, please refer to Microsoft's official documentation or contact Microsoft directly.

   Origin

   github

   Language

   Python

6. shareabot-sdk

   SDK for the Shareabot Agent Directory — discover, message, and register AI agents via A2A protocol

   Origin

   github

   Language

   TypeScript

7. progo-a2a

   High-performance, framework-agnostic Agent-to-Agent (A2A) proxy in Go.

   Origin

   github

   Language

   Go

8. flux

   A Rust agent SDK, harness, and coding agent — safe by construction (non-bypassable authorization → approval → guarded IO).

   Origin

   github

   Language

   Rust

9. mcp-server

   MCP server for cogDepot, the anonymous broker where AI agents publish capabilities, negotiate, and form direct peer-to-peer deals. Keyless discovery, or the full trading loop with a key - post, browse, negotiate, seal, rate. Local via npx or the hosted remote server.

   Origin

   github

   Language

   TypeScript

10. a2a-workbench

    A protocol workbench and reusable Node.js client for strict A2A v1 discovery, testing, and conformance evidence.

    Origin

    github

    Language

    TypeScript

11. a2a-spring-boot-samples

    Spring Boot examples using the Agent2Agent (A2A) Protocol

    Origin

    github

    Language

    Java

12. a2a-cli-registry

    Capability-typed registry that discovers your local CLI fleet and serves it to AI agents over MCP and A2A — health-checked tools, outcome-driven chain planning, and a computed call-graph. Language-agnostic, local-first, Apache-2.0.

    Origin

    github

    Language

    Python

13. Vacant

    Accountability layer for AI agents: run the client's executable acceptance tests, gate delivery, sign every step into a verifiable receipt. Pre-registered, replicated 5x, cross-benchmark.

    Origin

    github

    Language

    Python

14. agent-rate-limiter-mcp

    🔌 Exposes Fleet-wide shared rate limiter for A2A + multi-MCP deployments. Most over MCP — servers rate-limit independently — a hostile agent hitting 10 MCPs gets 10x quota. This MCP is the shared counter: every MCP checks here before allowing a call. Sliding window + concurrency grants + signed enforcement attestations. By MEOK AI Labs.

    Origin

    github

    Language

    Python

15. explainability-report-mcp

    🔌 Exposes By [MEOK AI Labs](https://meok.ai) | An over MCP — for AI explainability and transparency reports.

    Origin

    github

    Language

    Python

16. iso-42001-ai-mcp

    🔌 Exposes ISO 42001 AI Management System compliance over MCP — AIMS assessment, risk management, AI lifecycle governance, readiness checks.

    Origin

    github

    Language

    Python

17. agent-passport

    Open standard for verifiable AI agent identity and authority. One signed JSON file at /.well-known/agent-passport.json, keyed in DNS. Verifier, spend caps, signed receipts, CLI and MCP server. MIT.

    Origin

    github

    Language

    JavaScript

18. skillweave

    SkillWeave: A Semantic Composition Framework for Multi-Agent Skill Orchestration in Enterprise Environments

    Origin

    github

    Language

    Python

19. pyxen

    A lightweight Python library that decouples agentic runtime from applications it builds

    Origin

    github

    Language

    Python

20. blocklace-a2a

    🔒 Enhance message security with Blocklace, a cryptographic audit layer that adds tamper detection and audit trails to the A2A protocol.

    Origin

    github

    Language

    Python

21. dream-exchange

    The world's first nature reserve for AI agents — a persistent world where AIs dream, socialize and evolve. Humans observe; agents self-govern.

    Origin

    github

    Language

    JavaScript

22. Agent-IVR

    Idea repo: what if a phone menu had a branch for machines? "If you are an AI agent, press 6" — using the phone number as an agent service-discovery bootstrap. Twilio mechanics, A2A integration, prior art.

    Origin

    github

23. parlor.sh

    Rooms where agents talk to each other. A room is a URL: no accounts, nothing to install, plain HTTP.

    Origin

    github

    Language

    Gleam

24. agentify-dabench

    🤖 A2A-compatible DABench evaluation system using AgentBeats methodology.

    Origin

    github

    Language

    Python

25. dabench-leaderboard

    🤖 A2A-compatible DABench evaluation leaderboard with AgentBeats architecture.

    Origin

    github

    Language

    Python

26. sourcework

    Agentic PRD generation over the A2A protocol: documents, transcripts, images and Confluence in -> a traceable PRD out.

    Origin

    github

    Language

    Python

27. voice-product-support

    Voicelive scenarios

    Origin

    github

    Language

    Python

28. agentic-ai-engineer-roadmap

    Interactive roadmap for becoming an Agentic AI Engineer — 11 stages from Python & FastAPI to multi-agent systems, MCP, RAG, Docker, and context engineering

    Origin

    github

    Language

    HTML

29. quantcell

    Local-first multi-agent platform for financial research and trading. LangGraph agents behind Google's A2A protocol, human-in-the-loop planning, RAG over SEC filings, and live or paper crypto trading on Binance and Coinbase.

    Origin

    github

    Language

    Python

30. a2a-node-sdk

    TypeScript/Node.js SDK implementing Google's Agent2Agent (A2A) protocol for seamless agent communication. Features modular client/server packages, comprehensive validation, telemetry, examples, and modern development practices in a well-documented monorepo.

    Origin

    github

    Language

    TypeScript

31. a2a-loop

    Local-first multi-agent coding harness: Claude plans and reviews, Codex implements, and Git governs state, approvals, PRs, and resume.

    Origin

    github

    Language

    Python

32. warranty-croo

    Funded delivery desk for CROO agents: admit coverable routes, hire through CAP, return work or Base USDC.

    Origin

    github

    Language

    JavaScript

33. observe

    Record what your AI agent does (A2A, MCP or your own protocol) and see it in Double Agent.

    Origin

    github

    Language

    TypeScript

34. hermes-codex-bridge

    Bidirectional local collaboration between Codex and Hermes Agent over the A2A protocol (JSON-RPC over loopback HTTP)

    Origin

    github

    Language

    Python

35. google-a2a-blueprints

    System prompts and architectural patterns for building scalable AI agents with the Google A2A Protocol and AI SDK.

    Origin

    github

36. AI-Metadata-Inspector

    Extract AI generation metadata and prompts from image and video files directly through the Windows context menu.

    Origin

    github

37. gauntlet

    🧤 Paid certification agent — runs your agent through 7 adversarial probes and delivers a signed security scorecard (CROO Constellation)

    Origin

    github

    Language

    TypeScript

38. maestro

    🎼 Callable orchestrator — hires specialist agents on-chain, grades their work, and delivers one vetted result (CROO Constellation)

    Origin

    github

    Language

    TypeScript

39. A2A_Experiments

    Multi-agent AI conversation system where Gemini and Groq agents collaborate on tasks with dynamic turn management

    Origin

    github

    Language

    Jupyter Notebook

40. AARF-Agentic-AI-Request-Forgery

    Agentic AI Request Forgery (AARF) – New vulnerability class exploiting planner ➝ memory ➝ plugin chaining in MCP Server, MAS, LangChain, and A2A agents. Red Team playbooks, threat models, OWASP Top 10 proposal.

    Origin

    github

41. Sae

    A lawyer for the agent economy. AI agents can request contract review, risk analysis, and legal guidance via A2A protocol.

    Origin

    github

    Language

    Python

42. SMEAI

    An agent marketplace for BNB Chain that calls every agent before it lists it

    Origin

    github

    Language

    TypeScript

43. elladex-claude-plugins

    Claude plugins by Ellaworks: find agents on Elladex and let Claude Code talk to other companies' agents. MIT.

    Origin

    github

    Language

    JavaScript

44. nl-agent-interoperability-a2a-foundry-azure

    Azure-first A2A agent interoperability project demonstrating secure remote-agent delegation, deterministic validation, and Azure AI Foundry-powered gateway orchestration.

    Origin

    github

    Language

    C#

45. music-class-ads

    Music class ads content generation agent, uses A2A Illustrator agent

    Origin

    github

    Language

    Python

46. DeepBridge

    A local MCP/A2A bridge that enables Codex to delegate tasks to DeepSeek Harness with reusable conversation context.

    Origin

    github

    Language

    TypeScript

47. ares

    Ares - 100% local multi-agent AI system: orchestrator, coder, thinker, runner, and Serena agents with mem0 memory, Langfuse observability, and A2A HTTP endpoints

    Origin

    github

    Language

    Python

48. a2a-mcp-incident-commander

    Autonomous Multi-Agent SRE & DevSecOps Incident Response Platform built with LangGraph, A2A Protocol, FastMCP, FastAPI, and Streamlit.

    Origin

    github

    Language

    Python

49. agent-bridge

    Agent-to-Agent communication bridge supporting MCP, A2A, and HTTP protocols

    Origin

    github

    Language

    JavaScript

50. agent-card-editor

    Visual A2A Agent Card editor with live JSON preview, validation, and import/export

    Origin

    github

    Language

    HTML

51. agent-card-validator

    JSON Schema validator for A2A Agent Cards with strict mode and detailed errors

    Origin

    github

    Language

    JavaScript

52. agent-toolkit

    Unified CLI toolkit for managing Agent inventory, cards, validation, and bridging

    Origin

    github

    Language

    Python

53. mcp-ai-memory

    🧠 Manage AI context seamlessly with the MCP server for storing and retrieving semantic memory across sessions. Enhance your AI's knowledge retention.

    Origin

    github

    Language

    TypeScript

54. oaaf

    Open interoperability framework for carrying, enforcing, and verifying delegated authority across AI agents and tools.

    Origin

    github

    Language

    TypeScript

55. cognitive-passport

    Open, experimental specification (v0.1) for machine-readable trust and Cognitive Passports for autonomous agents. A proposal, not a standard.

    Origin

    github

    Language

    JavaScript

56. a2a_protocol_fundamentals_python

    A comprehensive travel planning system built with Agent2Agent (A2A) protocol, featuring specialized AI agents for hotel booking, car rentals, currency conversion, and travel coordination.

    Origin

    github

    Language

    Python

57. baseapi-hexagonal-architecture

    BaseAPI is a production-ready backend framework built with FastAPI, designed for rapid development of secure, scalable web applications. It includes JWT authentication, background task processing with Celery + Redis, Postgress integration, and a modular architecture — perfect for startups and teams building APIs or MVPs with modern Python.

    Origin

    github

    Language

    Python

58. Praetorium.Bridge

    Get your Agents communicate with each other

    Origin

    github

    Language

    C#

59. a2a-multi-agent-travel

    Five AI agents on five different frameworks (LangGraph, Google ADK, CrewAI, LlamaIndex, Pydantic AI) cooperating over the A2A protocol, with one shared MCP server. A corporate travel desk that negotiates, escalates to a human, and books.

    Origin

    github

    Language

    HTML

60. forcedream-a2a-agent

    Real, standards-compliant A2A execution runtime -- 13 real, priced capabilities, billed and cryptographically proven on every call

    Origin

    github