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How Autonomous Agents Use MCP, A2A, and MPP to Complete Real-World Tasks

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Autonomous agents rely on three layered protocols — MCP, A2A, and MPP — to discover tools, delegate work, and handle payments within a single request chain. MCP handles tool discovery through a structured JSON-RPC handshake, allowing agents to dynamically find and call available tools without bespoke integrations, even across enterprise gateways with permission controls. A2A enables agent-to-agent delegation by having each compliant agent publish a capability descriptor called an Agent Card, allowing a client agent to hand off stateful tasks to another independently built agent. Unlike plain API calls, A2A tasks support intermediate states, partial progress updates, and clarifying exchanges between agents. MPP completes the stack by enabling agents to transact and pay for services programmatically, making the entire workflow — discover, delegate, pay — operable end-to-end without human intervention.

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