How do I secure multi-agent communication channels?

Multi-agent communication channels are unvalidated by default — agents in frameworks like CrewAI, AutoGen, and LangGraph pass messages to each other without authentication, integrity verification, or content validation, making agent-to-agent prompt injection trivial.

Attack vectors in multi-agent communication:

• Agent impersonation: One agent pretends to be another, sending instructions that the target agent follows
• Message tampering: Inter-agent messages are modified in transit to change the instructions
• Context poisoning: A compromised agent injects malicious context into the shared conversation that influences all other agents
• Privilege escalation: A low-privilege agent asks a high-privilege agent to perform actions it can't do itself

Exogram secures multi-agent systems through namespace isolation. Each agent operates in its own governance namespace with its own policy rules. When Agent A asks Agent B to perform an action, Agent B's governance layer evaluates the action independently. A compromised Agent A can't escalate through Agent B because Agent B's policy engine doesn't trust Agent A's requests — it validates the actual action.