A2A Security — Authentication, Authorization, and Isolation

Why it matters

Insecure A2A deployments give attackers new attack surface. Every capability of every agent is potentially callable. Locking down permissions is critical.

The architecture

Authentication: OAuth/mTLS/API keys verify identity.

Authorization: per-caller policy determines what actions allowed. Not every authenticated caller gets full access.

How it works end to end

Sandboxing: risky tools called only within controlled environment. E.g., code execution in container, network in restricted VPC.

Rate limiting: prevent abuse from misbehaving or compromised agents.

Audit logging: every A2A call logged. Enables detection and forensics.

Revocation: ability to disable an agent quickly if it turns malicious.