{"id":"youtube-ctx-dict-blackboard","text":"Pipeline stages communicate through a mutable `ctx` dict rather than return values — a blackboard pattern that avoids inter-stage type coupling but sacrifices type safety.","truth_value":"IN","source":"entries/2026/06/05/design-youtube-design_youtube.md","source_url":"","source_hash":"","justifications":[],"dependents":["video-pipeline-separates-control-from-data-flow"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"youtube-ctx-dict-blackboard","truth_value":"IN","reason":"premise"}]}}