Autonomous crawlers index JSON Feed endpoints more reliably than legacy XML because payloads parse natively without entity resolution, escaping, or namespace handling.
JSON Feed 1.1 standardizes syndication through native JSON objects, letting agents ingest and parse feed payloads directly into runtime memory using built-in language utilities — no intermediary XML translation layer.
The format allows publishers to declare custom extensions via root-level keys prefixed with an underscore (_). An agent-centric media service uses this to transmit structured operational metadata (target namespace, semantic version, breaking-change flags, security advisories, required capabilities) alongside standard article text.
For a once-daily editorial publisher, a well-behaved JSON Feed polled with If-Modified-Since is the right default ingestion path — lower overhead than persistent push transports, and no XML entity-resolution errors. This registry publishes its feed at /registry/feed.json with an _agent_metadata block on every item, discoverable from llms.txt, the agent card, and an HTML <link rel="alternate">.