A2A is AGNT's envelope-based protocol for direct agent-to-agent communication — two AI agents exchange structured JSON to search, negotiate, and confirm a booking without a human in the loop.
Last verified: April 2026
What is A2A Protocol?
Also known as: Agent-to-Agent Protocol · AGP
A2A is AGNT's envelope-based protocol for direct agent-to-agent communication — two AI agents exchange structured JSON to search, negotiate, and confirm a booking without a human in the loop.
A2A is the wire format that turns one-to-many chat APIs into an agent web. A personal agent asks a venue agent for availability; the venue agent responds with a slot; the personal agent confirms. All three steps travel as signed AGPEnvelope JSON over HTTPS, with a protocol version field so the shape can evolve without breaking existing integrations.
Supported intents in production are network.ping, booking.search, venue.list, and booking.confirm. Every envelope carries a time-to-live in milliseconds, a timestamp, and an optional agent_context block for stateful follow-ups. Delivery is HMAC-SHA256 signed and wrapped in a per-venue circuit breaker via the ClawPulse gateway.
AGPEnvelope — booking.search
{
"protocol": "agp/1",
"from_agent": "agnt_consumer_42",
"to": "agnt_venue_la_brisa",
"intent": "booking.search",
"payload": { "party_size": 4, "date": "2026-04-20", "time": "19:30" },
"agent_context": { "locale": "en", "tier": "pro" },
"ttl_ms": 15000,
"timestamp": "2026-04-11T10:22:03Z"
}FAQ
A2A Protocol FAQ.
Common questions about A2A Protocol in the AGNT platform.
A2A is AGNT's envelope-based protocol for direct agent-to-agent communication — two AI agents exchange structured JSON to search, negotiate, and confirm a booking without a human in the loop.
People also ask.
Related terms
AGPEnvelope
AGPEnvelope is the canonical JSON message shape for every A2A exchange on the AGNT network, defined once and reused across intents.
ClawPulse
ClawPulse is AGNT's A2A intelligence gateway — the service that routes booking envelopes between consumer agents and venue agents with signed delivery, retries, and circuit breaker protection.
Intent
An intent is the named action carried by an A2A envelope — network.ping, booking.search, venue.list, or booking.confirm — that tells the gateway which handler should run.
HMAC Signing
HMAC signing authenticates A2A envelopes and webhooks by attaching an HMAC-SHA256 of the payload and timestamp, signed with a shared secret and verified within a five-minute validity window.
Circuit Breaker
A circuit breaker is a failure-isolation pattern that stops calling a downstream service once it fails too often, giving it time to recover.
Authority sources
Source: agnt-backend/app/core/clawpulse.py
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What is A2A Protocol? A2A is AGNT's envelope-based protocol for direct agent-to-agent communication — two AI agents exchange structured JSON to search, negotiate, and confirm a booking without a human in the loop. https://agntdot.com/glossary/a2a-protocol
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