What problem does it solve? Developers working on the Helios FHIR Server need to build, debug, and configure the topic-based Subscriptions engine that evaluates resource events against SubscriptionTopic criteria and delivers notifications across multiple channels. ## Core Features & Use Cases - Multi-Channel Delivery: Supports rest-hook (HTTP callback), websocket, email, and messaging channels, with the messaging channel gated by its own environment flag. - Topic-Based Matching: Evaluates resource events against SubscriptionTopic criteria using the evaluator and filter matching logic in the engine. - Reliable Delivery: Retries failed notification deliveries with backoff and blocks rest-hook delivery to private or loopback endpoints unless explicitly allowed. - Use Case: When adding a new notification channel or debugging why a Subscription is not firing, use this Skill to navigate the engine, evaluator, manager, and channels modules plus their CI workflows and tests. ## Quick Start Ask the assistant to explain how the subscriptions engine matches a resource event to a SubscriptionTopic and delivers a rest-hook notification, including which environment variables control the behavior.
