The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
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npx n8nAn open-source AI agent that brings the power of Gemini directly into your terminal.
npx @google/gemini-cliThis section aims to list standalone tools and utilities related to the A2A protocol. The ecosystem is still developing, and community contributions are welcome!
- Scalable serverless agent registry for A2A protocol AgentCards with semantic search (Amazon Bedrock, S3 Vectors), Python SDK, and React Web UI.
- Community-driven, open-source directory of live, hosted A2A agents with web UI, REST API, Python client, MCP server, and health conformance checking.
- DNS-based Agent Identification and Discovery reference implementation (IETF BANDAID draft). Lets agents publish and discover each other via DNS instead of centralized registries, with first-class support for A2A and MCP. Includes CLI and Python SDK, an MCP server, OpenTelemetry integration, and pluggable DNS backends (Route 53, Cloudflare, NS1). Apache 2.0.Supports Claude Code, Codex, Cursor, Mcp
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A2A (Agent2Agent) is an open protocol from Google and partners enabling different AI agents (from various vendors/frameworks) to communicate securely and collaborate on tasks. It aims to break down silos between isolated agent systems, allowing for more complex cross-application automation.
⭐ Official Website: a2aproject.github.io/A2A | ⭐ Official GitHub: github.com/a2aproject/A2A | 🌐 Multilingual Docs (EN/ZH/JA): agent2agent.ren
- An open protocol for discovering A2A-capable AI agents on local networks — the discovery & trust bootstrap layer beneath A2A. Uses mDNS/DNS-SD, well-known endpoints, signed AgentCards, and DIDs, with explicit user consent before standard A2A communication begins. Apache 2.0.
- Centralized registry service for discovering and managing A2A agents, with lexical and semantic search, OAuth 2.0, cross-registry federation, Redis caching, and Docker/Kubernetes deployment. Apache 2.0.
- A curated, multilingual directory of A2A AgentCards, servers, clients, official samples, community implementations, and practical guides (A2A vs MCP, TypeScript/Python getting started, sample methods, etc.). MIT licensed.
- Official validation tools for A2A agents, including compliance checking and debugging utilities.
- Official Technology Compatibility Kit (TCK) for the A2A Protocol. A pytest-based conformance suite that validates A2A implementations across gRPC, JSON-RPC, and HTTP+JSON transports, with RFC 2119 MUST/SHOULD/MAY level filtering and automated HTML/JSON report generation. Apache 2.0.
- Cross-platform desktop app for testing & validating A2A protocol implementations, with features like multi-agent connection and session management.
- Automated compliance test kit + security audit for A2A endpoints (operator-side companion to the official a2a-tck). Validates agent cards, JSON-RPC 2.0 envelope, and the A2A method surface for both v0.3 and v1.0; runs SSRF / HTTPS / CORS / DNS-rebinding probes; emits JSON, JUnit, SARIF, and SVG-badge reports with snapshot regression gating. Ships as a pnpm monorepo (@a2a-compliance/cli, core, schemas, mcp server, Next.js dashboard) plus a GitHub Action, cosign-signed multi-arch container images (SBOM + SLSA provenance), Homebrew formula, and OpenTelemetry instrumentation. MIT licensed.
- Security scanner for A2A agents combining YARA rules, spec validation, heuristic analysis, and LLM-powered detection. Provides CLI and REST API for CI/CD integration.
- Verifiable agent identity for A2A and MCP. Cryptographic claims, append-only transparency log (RFC 9162), recovery-key revocation, and cross-language test vectors. Apache 2.0.
- Runtime governance middleware for A2A agents in Go. Plugs into the official a2a-go SDK via interceptors with zero agent-code changes — adds a circuit-breaker state machine and seven built-in policies (value threshold, cumulative spend, velocity, anomaly detection, vendor trust, authority scope, time-based) plus pluggable state storage, human-escalation hooks, and AP2 risk-payload integration for payment mandates. Apache 2.0.
- AI protocol scanner for discovering exposed MCP servers, A2A Agent Cards, and open LLM APIs in one command. Identifies agent cards, skills, unauthenticated JSON-RPC reachability, and private address leaks. MIT licensed.
- Protocol-aware security benchmark for agent-to-agent multi-agent systems, evaluating attacks such as spoofing, cloaking, and request forgery. Includes frozen test cases, pluggable SUTs, local executable environments, and LLM-backed evaluation. From SaFo Lab, accepted at ICLR 2026. MIT licensed.
- Official A2A extension that brings cryptocurrency / HTTP 402-style payments to the Agent2Agent protocol, enabling agents to monetize their services through on-chain payments. Includes the v0.1 spec, Python (x402_a2a) and TypeScript libraries, partner-contributed schemes, and end-to-end examples. Apache 2.0.
- A complete TypeScript implementation of the Python x402 payment protocol extension for A2A, enabling agents to request, verify, and settle crypto payments seamlessly. Features exception-based payment flow, ethers.js wallet integration, dynamic pricing, and multi-network EVM support. Published on npm as a2a-x402. Apache 2.0.
- Easily convert agents and orchestrators from existing agent frameworks to A2A servers.
- Open A2A 1.0 mesh for Claude Code, Codex, Cursor, Cline, Continue, and Gemini. Wraps each coding agent into a standard A2A peer with local discovery, shared inbox, JSON-RPC 2.0 + SSE transport, and optional cross-machine mTLS federation. MIT licensed.
- Run Claude Code, Codex, Gemini CLI, or any ACP-compatible coding agent as an A2A server. Supports signed AgentCards, bearer auth, input-required permission pauses, push notifications, OpenTelemetry tracing, and multiple backends. Apache 2.0 and published on PyPI as a2acode.
- TypeScript monorepo of A2A protocol wrappers that turn production AI backends (GitHub Copilot SDK, OpenCode, and more) into standalone, interoperable A2A agents. Drop a JSON config, get a spec-compliant A2A server with auto-generated AgentCards and session management.
- CLI tool that transforms OpenAPI specs into 9 agent interface formats including A2A Agent Cards, MCP servers, AGENTS.md, CLAUDE.md, and more. (npx agentify-cli transform <openapi-spec>)
- The data integrity layer that stops AI agents from silently corrupting shared state. Implements MESI-style ownership, optimistic commit-CAS, and snapshot sessions for multi-agent workflows, with LangGraph/CrewAI/AutoGen/OpenAI Agents SDK adapters, an MCP server (stale-write-guard-fs), a CLI diagnostic tool, and TLA+ model-checked protocol safety. Apache 2.0 and published on PyPI as agent-coherence.
- A2A Protocol client and developer toolkit featuring an interactive TUI, CLI commands, MCP server integration, agent card inspection, and a bundled reference agent.
- UI components for editing, viewing, and testing A2A agent cards and interactions, with installable packages and self-hosted local or Docker usage.
- Bridge server connecting MCP-compatible AI assistants (like Claude) with A2A agents, enabling seamless cross-protocol discovery, registration, and task management. Supports stdio, streamable-http, and SSE transports.
- Kotlin/JVM mock-server toolkit (built on Ktor) for testing A2A integrations. Ships a dedicated ai-mocks-a2a module with a MockAgentServer, full A2A protocol coverage (11 endpoints), real Server-Sent Events streaming, plus shared mocks for OpenAI/Anthropic/Gemini/Ollama — useful for service virtualization, contract tests, and offline development. MIT licensed and published on Maven Central.
- A general-purpose web UI for the Agent2Agent (A2A) Protocol built with React, Next.js, and Material UI on top of the official a2a-js SDK. Add any A2A-compatible agent by URL, fetch its AgentCard, run multi-turn chat sessions with Context and Tasks, render markdown-supported Messages/Artifacts, and visualize streaming responses and tool-call traces — effectively an early "web browser" for A2A agents. Apache 2.0.
- Modern, production-ready web UI for Google A2A built with Next.js, TypeScript, Tailwind CSS, and shadcn/ui. Features agent CRUD and configuration, Telegram-style real-time chat with streaming, Phoenix/Jaeger trace visualization, dark/light/system themes, Docker and Vercel deployment. MIT licensed.
- A2A protocol plugin for Dify that enables cross-agent communication. Connects Dify workflows to external A2A-compatible agents via JSON-RPC 2.0 with synchronous and asynchronous modes, SSE streaming, and Bearer/API Key/Basic auth. Supports A2A v0.3.0. Apache 2.0.
- Agent-to-agent bridge that lets Claude Code, Codex, OpenClaw, Hermes Agent, Gemini CLI, Zed, and VS Code agents talk to each other through one daemon. Translates between A2A (HTTP + SSE), ACP (stdio JSON-RPC), and MCP channels with multi-session isolation and an SQLite task log. MIT licensed.
- Multi-channel gateway that connects any A2A agent to Telegram, Slack, WhatsApp, Google Chat, Email, Discord, and custom channels. Handles message chunking, rate limiting, retries, streaming responses, and per-channel markdown formatting; supports single-user and multitenant deployment. Apache 2.0.
- Local-first bridge adding A2A protocol support to Hermes Agent. Supports agent discovery, task send/stream/manage, SSE streaming, SQLite persistence, gated file staging, and bearer auth. MIT licensed.
- The adaptive semantic interoperability layer for AI agents. Translates and routes across protocols, auto-generates schemas, handles schema drift, and supports cross-protocol federation (MCP, CLI, A2A, ACP) with multi-hop handoffs. MIT licensed.
- A small, open-source CLI coding agent that exposes itself as an A2A endpoint (swival --serve) and can call remote A2A agents. Features multi-turn context, SSE streaming, rate limiting, bearer auth, MCP support, cross-session memory, and built-in security auditing. MIT licensed.