Agent-to-Agent (A2A) Communication

A single user request increasingly fans out to multiple specialized agents that plan, retrieve, and execute together. The new Google A2A protocol and emerging interoperability standards make this pattern explicit. Each handoff between agents adds a trust boundary that must be authenticated and authorized.

A2A communication typically requires:

• Mutual authentication: Each agent verifies the identity of the agent it is talking to.
• Message integrity: Signed or attested messages to prevent in-flight tampering.
• Scoped delegation: Each handoff carries the minimum authority the next agent needs.
• Observability: End-to-end traces that connect cross-agent actions to a single intent.
• Policy enforcement: Per-handoff checks that block calls outside the multi-agent workflow.

As multi-vendor agent ecosystems mature, A2A security will increasingly resemble service-mesh patterns familiar to platform engineering teams. The difference is that the principals are autonomous reasoners, so observability and policy must extend to intent, not just network paths.

Investment in A2A controls today also pays forward as the agent population grows, because the same identity and policy primitives apply to every new agent that joins the workflow.

How PointGuard AI Helps

PointGuard's Agent Governance Mesh applies identity, authorization, and observability across single-agent and multi-agent topologies, so A2A traffic carries the same governance and audit guarantees as direct user actions. The mesh applies the same policy and audit consistency across A2A traffic that customers already expect for direct user actions.

Learn More

• OWASP Top 10 for Agentic Applications
• Linux Foundation: Agent2Agent (A2A) Project
• MITRE ATLAS