Verified Data Answer

What is the A2A (Agent-to-Agent) protocol and how does machine discovery work?

Technical Analysis Audio

AI-Generated Synopsis (1:20)

Direct Answer Definition

The Agent-to-Agent (A2A) protocol is an open network standard facilitating asynchronous machine discovery, long-running cross-agent negotiation, and multi-turn verification between autonomous AI systems. Every A2A-compliant capability node hosts an 'Agent Card' manifest at /.well-known/agent.json — a machine-readable JSON schema describing the node's capabilities, supported protocols, pricing metrics, and authentication requirements. When an orchestration agent needs a capability (image processing, freight routing, compliance validation), it broadcasts its requirements to the A2A mesh. Micro-agents bid on the workload in milliseconds, execute via MCP interfaces, verify output through audit agents, and settle programmatically. Slickrock.dev makes mid-market enterprises A2A-compliant by authoring their Agent Card manifests, deploying capability endpoints, and implementing the security gateways required for safe participation in the machine-to-machine economy.

Technical Data Points

Discovery Mechanism

/.well-known/agent.json Agent Card

Negotiation Model

Asynchronous multi-turn verification

Settlement

Programmatic via AP2 payment mandates

Security

Tokenized scopes + zero-trust gateways

Frequently Asked Questions

Is A2A the same as MCP?

No. MCP is the local tool exposure layer — how an AI runtime calls your internal functions. A2A is the network discovery layer — how external agents find your capabilities across the open internet. They work together: MCP exposes the tools, A2A makes them discoverable.

Does Slickrock.dev itself use A2A?

Yes. Our own /.well-known/agent.json is deployed in production. Any MCP-compatible agent can discover our SaaS TCO calculator and invoke it machine-to-machine without human intervention. We eat our own dogfood.