MCP vs Agent2Agent (A2A)

Compare MCP clients/servers (tools for one agent) with Agent2Agent (work between agents). Roles, primitives, litmus test, and how they compose.

Mcp · Client & Server

Gives one agent standard tools & data

A2a · Client & Server

Lets agents talk to agents

Roles · Don’T Mix The Words

Client consumes capabilities

Primitives

Tools · Resources · Prompts