A2A Public Facade & Behavior Certificates

2026-03-23

apisecurity

What We Built

Public A2A facade with behavior certificates. 6 API endpoints for agent messaging, discovery, and certificate management. HMAC-signed certificates with 7 capability types, tamper detection, and action verification.

Lockstep Checklist

[x] API: 6 endpoints
[x] SDK-TS: A2A resource
[x] SDK-PY: A2A + AsyncA2A
[x] MCP: br_a2a_send, br_a2a_discover
[x] Tests: 13 tests
[x] Docs: Ship log