Deep-Dive: How AT Protocol Implements Standardized Feed Opt-Out Metadata Flags

The AT Protocol relies on open Lexicon schemas to define data records published by user Personal Data Servers (PDS). The new algorithmic opt-out feature modifies the standard profile and post schemas to include a boolean opt-out property.

Relays and App Views parsing the global firehose filter incoming post streams against this property. When opt-out is detected, feed indexing services automatically exclude the record from recommendation clusters, matrix factorization graphs, and trending topic pipelines.

This client-side declaration framework demonstrates how open protocols can enforce user privacy preferences across third-party indexers without centralized platform moderation.