A2A Protocol MCP Server

MCP server implementing the Google Agent2Agent (A2A) Protocol for AI agent discovery and task delegation.

The A2A protocol enables AI agents to communicate with each other regardless of framework or vendor. This server provides a local A2A-compatible directory where agents can register, discover each other by capability, and delegate tasks.

Tools

| Tool | Description | |------|-------------| | create_agent_card | Create an A2A-compatible agent card | | register_agent | Register an agent in the local directory | | discover_agents | Search agents by capability | | send_task | Create a task request for a target agent | | get_task_status | Check task status by ID | | list_registered_agents | List all registered agents |

Installation

npm install @aiagentkarl/a2a-protocol-mcp-server

Or run directly with npx:

npx @aiagentkarl/a2a-protocol-mcp-server

Configuration

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "a2a-protocol": {
      "command": "npx",
      "args": ["-y", "@aiagentkarl/a2a-protocol-mcp-server"]
    }
  }
}

How It Works

1. Register agents with their capabilities and endpoints
2. Discover agents by searching for specific capabilities
3. Send tasks to agents and track their status
4. Agent cards follow the A2A protocol format for interoperability

Data is stored locally in ~/.a2a-agents/ as JSON files.

A2A Protocol

Google's Agent2Agent protocol defines a standard for AI agents to:

• Discover each other through agent cards
• Communicate via structured task messages
• Delegate work across different agent frameworks

This server implements the core discovery and task delegation patterns as MCP tools, making A2A capabilities available to any MCP-compatible AI client.

License

MIT