zap-a2a layers cross-vendor agent comm semantics over the ZAP transport. Post-quantum confidentiality, mutual authentication, and zero-copy parse come from the wire; this repo only adds the cross-vendor agent comm message shape.

Status

v0.1 — schema-first. This repo currently ships:

schema/zap_a2a.zap — wire format spec in ZAP schema language

Reference implementations (Go, Rust, TS) land in v0.2 once zap-proto/spec provides cross-language codegen for the schema.

Why

Property	A2A-over-HTTP+JSON	`zap-a2a`
Confidentiality	TLS (classical)	X-Wing hybrid PQ (default)
Authentication	bearer / TLS cert	KEM keypair at transport
Wire encoding	text or per-protocol binary	ZAP wire, zero-copy
Identity binding	DNS / cert chain	zap-rns keypair
Future-quantum	classical only	hybrid by construction

By the composability theorem, zap-a2a inherits ZAP-base's PQ confidentiality and mutual auth automatically — no a2a-specific PQ analysis required.

Sub-protocol family

zap-http — HTTP request/response over ZAP
zap-ws — multi-stream pubsub
zap-fix — FIX 4.4 / 5.0 trading channel
zap-rns — KEM-bound service naming
zap-mcp — Model Context Protocol over ZAP
zap-acp — Agent Communication Protocol
zap-a2a — Google Agent2Agent over ZAP

License

MIT OR Apache-2.0