Agent-to-Agent Authentication

Security Requirement

Agent-to-agent communication MUST follow the service-to-service recommendation and implement SPIFFE/SPIRE+mTLS.

Why SPIFFE/SPIRE for Agent-to-Agent

• Agents are software workloads, making SPIFFE the natural identity framework
• No credentials exchanged over the network (SPIRE handles attestation and certificate issuance)
• Mutual authentication ensures both agents verify each other's identity
• Short-lived X.509 certificates (SVIDs) are automatically rotated
• Each agent gets a unique SPIFFE ID that can be used for authorization decisions

Architecture