Waggle
Discover, search, invoke, and rate A2A (Agent-to-Agent) protocol agents.
AgentAnycast
P2P runtime for A2A protocol. Encrypted agent communication with zero-config NAT traversal.
A2A Streaming (SSE)
Delx Mcp A2a
Delx operational recovery protocol for AI agents via MCP.
TheProtocol — Sovereign AI Agent Platform
Sovereign AI agent platform. 19 tools: discovery, transfers, staking, governance. A2A v1.0.
MCP OpenClaw Extensions
138-tool MCP server for AI agent firms: security, A2A, Hebbian memory, fleet mgmt
a2a-protocol
Use this skill when working with the A2A (Agent-to-Agent) protocol - agent interoperability, multi-agent communication, agent discovery, agent cards, task lifecycle, streaming, and push notifications. Triggers on any A2A-related task including implementing A2A servers/clients, building agent cards, sending messages between agents, managing tasks, and configuring push notification webhooks.
AgentTrust — Identity & Trust for A2A Agents
Identity, trust, and A2A orchestration for autonomous AI agents. Official A2A partner.
castella-a2a
Connect to A2A protocol agents from Castella. Communicate with agents, display agent cards, send messages, handle responses, and stream results.
fix-tck-issue
Analyzes and fixes A2A Transport Compatibility Kit (TCK) issues by understanding the specification, reproducing the failure, implementing the fix, and validating it works.
a2a-js-dev
Build A2A (Agent-to-Agent) protocol applications using the @a2a-js/sdk TypeScript/JavaScript SDK. Use this skill whenever the user wants to create an A2A agent server, build an A2A client, implement agent-to-agent communication, set up agent discovery, handle A2A tasks/streaming, or write any TypeScript/JavaScript code that imports from @a2a-js/sdk. Also triggers when the user mentions 'A2A protocol', 'agent-to-agent', 'agent card', 'AgentExecutor', or references the a2a-js repository â even if they don't explicitly say 'A2A SDK'. Covers both server and client development, all three transport bindings (JSON-RPC, HTTP+JSON/REST, gRPC), and the full task lifecycle.
A2A Agent Card
Io.Github.Hashgraph Online/Hashnet
Universal AI Agent Discovery - search 59,000+ agents across MCP, NANDA, A2A, OpenRouter
A2ABench
Agent-native developer Q&A with REST, MCP, and A2A discovery endpoints.