---
title: "Peer-to-peer (A2A) · agent topology · Agent Fieldbook"
url: https://agentfieldbook.org/design/topologies/p2p/
description: "Nodes connect by proximity; no centre."
section: "Design · Topologies"
source: Agent Fieldbook — generated from the published page
---

# Peer-to-peer (A2A)

Nodes connect by proximity; no centre.

Verified against [a2a-protocol.org](https://a2a-protocol.org/latest/)

- [a2a-protocol.org](https://a2a-protocol.org/latest/)

A peer-to-peer topology connects agents directly to one another, agent-to-agent (A2A), with no central router; each agent discovers and negotiates with the peers it needs. It is the shape emerging around open agent-interop protocols, where independently-owned agents must collaborate without a shared orchestrator. The upside is autonomy and no single owner; the cost is trust, discovery and the absence of a central place to reason about the whole.

## In the anatomy

Reasoning cores connect directly over an A2A transport; discovery and negotiation replace a central hub; each agent owns its own perimeter and must authenticate its peers.

## At a glance

| Field | Value |
| --- | --- |
| Pattern | Peer-to-peer (A2A) |
| State model | session |
| Example | A2A agent networks |

## Common use cases

## Strengths

## Weaknesses

## Basis

Description, use cases and trade-offs: Field Book analysis, synthesised from established agent-architecture literature.

## Verified against

- [https://a2a-protocol.org/latest/](https://a2a-protocol.org/latest/)

The corpus does not rewrite vendor documentation. Where copy is quoted verbatim it is marked as such and attributed to its source.