EventBridge is a serverless event bus. S3 file uploads emit events → EventBridge rule matches on object type → triggers Step Functions or Lambda.

EventBridge is a serverless event bus. S3 file uploads emit events → EventBridge rule matches on object type → triggers Step Functions or Lambda. Decouples producers (data sources) from consumers (agents). Supports event filtering, scheduling (nightly batch jobs), and cross-account routing. Adding a new agent doesn't require changing the data source — just add a new EventBridge rule.