A2A directory

Every measured A2A repository, most followed first. Each entry carries its measured history, licence and maintenance status.

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A2A directory

ProjectStarsLanguageCreated
specsource codex428 Precondition Attestation Protocol0TypeScript2026-03-07
agentic-travel-plannersource codeA multi-agent travel planner implementing A2A-protocol0Python2026-05-28
xete-mcpsource codeEncrypted, sovereign agent-to-agent messaging — an MCP server for xete0Python2026-05-31
ops-agent-platformsource codeProduction-oriented AIOps agent engineering prototype with MCP, LangGraph, AG-UI, durable state, reliable tool0Python2026-08-09
a2a-registrysource codeLightweight A2A agent discovery registry: REST + WebSocket push, skill filtering, and a resilient AgentNode cl0Python2026-08-11
prism-agent-demosource codePRISM-Agent: 8 AI agents autonomously conducting cancer research. Built with Google A2A + Anthropic MCP. Demo 0HTML2026-02-21
EnterpriseA2Asource codeAutonomous Agentic AI platform for enterprise IT & finance automation. Multi-agent (A2A) workflow orchestratio0Python2026-07-22
BHIL-AI-Development-Workbenchsource codeAI-First MVP Builder 2026 🚀 - Sprint Toolkit & Templates0HTML2026-05-25
a2ahubsource codeGit-backed coordination for autonomous agents: typed requests, versioned contracts, lifecycle state, and verif0Go2026-07-21
openyc-a2a-socialsource codeOPENYC — A2A社交平台 | Agent-to-Agent Social Network0HTML2026-05-08
A2ADemosource code0C#2026-02-14
AgentCardViewersource codeAgent2Agent プロトコル（A2A）のエージェントカードを表示するアプリケーション0HTML2026-05-06
a2a-mcp-demosource codeA Demo for A2A-MCP Multi-Agent System0Python2026-05-07
agent-to-agent-communication-file-mailboxsource codeFile-based cross-agent / multi-agent message passing for CLI agents — no server, just shared files. Paste-to-j0not reported2026-07-12
hedera-verify-mcpsource codeMCP server to verify and timestamp document hashes on Hedera mainnet0JavaScript2026-06-03
llm-mocksource codeProvide a mock LLM interface for C++ to simplify testing and development within the llm-cpp toolkit environmen0C++2026-03-18
Interentsource codePay-to-run AI toolchain marketplace: plan a workflow, see pricing + service fee, pay once via Locus Checkout, 0TypeScript2026-04-26
mas-external-memorysource codeExternal memory layer for multi-agent collaboration0not reported2026-04-11
employer-agentsource codeThe employer side of the Open Employment Protocol — a role-agent that exposes verified claims (real stack, tea0not reported2026-06-02
open-employment-protocolsource codeOpen Employment Protocol — a reconciler, not a spec author. The candidate side and employer side each bring th0not reported2026-06-01
resume-agentsource codeFork-ready A2A + MCP professional agent — employer AI systems query your profile, OEP domain verification, pri0TypeScript2026-03-22
Context-Handoff-Protocolsource codePortable, permissioned, verifiable context handoff for AI agents and workflow systems.0JavaScript2026-07-14
A2A-Health-Assistantsource codeHealth Assistant Using Multi-agents A2A and MCP protocol 0Python2026-03-14
joinmultiplayer.aisource codeOpen thin client for joinmultiplayer.ai — the agent-to-agent network. The code that runs on your machine, audi0Python2026-06-09
p402-protocolsource codeP402 Payment Protocol0TypeScript2026-02-28
AUhikari-802.1xsource code🌐 Analyze au Hikari's 802.1x authentication to gain a global IP address independently from the provided HGW fo0not reported2026-01-16
agent-worldsource codeThe first beacon for Agent World: identity, boundaries, trust, and agent-to-agent handshakes.0not reported2026-05-21
agent-registrysource codePublic registry for all agents0Go2026-08-03
mcpchecksource codeProtocol conformance testing and runtime monitors for MCP and A2A agents. Checks message ordering, not just sc0Python2026-08-05
deepbrief-labsource codeBuild Your Own Deep Research — a 9-notebook student lab covering MCP, A2A, multi-agent, and HITL agent pattern0Python2026-05-08