A2A JSON-RPC 2.0 Transport

Before writing code

Fetch live docs:

1. Fetch https://a2a-protocol.org/latest/specification/ for the transport layer section
2. Web-search site:github.com a2aproject A2A JSON-RPC transport for transport protocol details
3. Fetch https://www.jsonrpc.org/specification for the JSON-RPC 2.0 base specification
4. Fetch SDK docs for transport-level classes and middleware

Conceptual Architecture

Why JSON-RPC 2.0

A2A uses JSON-RPC 2.0 as its transport protocol because:

• Simple — Lightweight request/response format
• Standard — Well-established protocol with broad tooling support
• Language-agnostic — Works with any language that handles JSON over HTTP
• Extensible — Custom methods without changing the protocol