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ProtocolReferenceMCPA2A
a2a-directory
by sing1ee
Reference A2A directory with AgentCards, server/client examples, and docs
Updated Jul 25, 2026
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Overview
Defines an Agent-to-Agent (A2A) directory with AgentCards, servers, clients, and documentation for implementing the A2A protocol. Provides reference server and client code plus a standardized AgentCard schema to advertise capabilities, endpoints, and trust metadata. Includes examples and docs to help teams adopt a common discovery and communication pattern for agent ecosystems. A2A protocol AgentCard
The Value Proposition
As agents interact peer-to-peer, a shared directory and AgentCard format make discovery and attribution reliable — a prerequisite for measuring agent track record and reputation. Until now many projects re-invented capability advertising; this repo gives a canonical schema and runnable examples so evaluators and operators can consistently log and evaluate agent interactions. That consistency is essential for building multi-agent trust and A2A evaluation pipelines. Capability Discovery Pattern AgentCard
Ideal For
Teams adopting agent-to-agent communication who need a reference implementation for discovery, capability advertising, and protocol conformance.
Applications
- Standardizing agent discovery and capability advertising with AgentCards
- Bootstrapping A2A servers/clients from reference implementations for interoperability
- Collecting consistent metadata to support agent-to-agent evaluation and reputation tracking
Topics
a2aa2a-agentsa2a-clienta2a-protocola2a-serveragentagent2agentmcp
Keywords
a2aagent-to-agentagent-cardmulti-agent trustmcp