If one agent needs to talk to another agent, how can you enable that communication? Are there protocols for agent-to-agent communication?

Agents can communicate through message passing. Common protocols include HTTP/REST for synchronous calls, gRPC for efficient binary RPC, AMQP (RabbitMQ) or MQTT for lightweight messaging, and Kafka for high‑throughput event streams. In a microservices architecture, each agent exposes an API endpoint and other agents invoke it. For asynchronous communication, a message broker like RabbitMQ or Kafka is used; each agent publishes to a topic and subscribes to topics of interest. If agents run in the same process, an in‑memory event bus or queue can be used. Security is handled with TLS, authentication tokens, and role‑based access. The choice of protocol depends on latency, throughput, reliability, and the need for synchronous vs. asynchronous interaction.