Experience · Software component

Accessibility Announcer

Software componentExperienceExperience & Human Oversightarc:AccessibilityAnnouncer

A presentation component that relays dynamic agent output and alerts to assistive technologies through live regions, buffering streamed text to announce only complete sentences.

Responsibility. Announces agent updates to screen readers at appropriate granularity.

Also known as: Screen-reader live region, Streaming response accessibility

Direct neighbourhood (hover for relationship types)

Relationships

receives data from dynamic

Response Streamer Ch1.1B

sends data to dynamic

End User Ch1.1B

Design guidance

SHOULD announce streamed responses only at sentence boundaries, separately from the visual display.
SHOULD use polite announcements by default and assertive ones only for critical alerts.

Classification

Patterns: ARIA live region (polite/assertive)Sentence-boundary announcement
Technologies: ARIASemantic HTML
Quality attributes: Interaction capability (ISO/IEC 25010)
Risks mitigated: Screen-reader overload from token-by-token updates
Frameworks & regulations: WCAG 2.1 Level AA (Robustness)

Sources

Ch1.1B: T. Nguyen, "Human-in-the-Loop Patterns and Accessible Design," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 1.1B. ISBN: 9798244538229.