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slug: human-facing-software
created: 2026-04-04
updated: 2026-04-04
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# Human-Facing Software

Every system eventually meets a person. It might be a customer tapping a phone screen, an administrator scanning a dashboard, or a developer reading an error message in a terminal. The moment software touches a human being, a new set of concerns comes into play: concerns that have nothing to do with algorithms or data structures and everything to do with perception, cognition, and communication.

This section lives at the **tactical** level: the patterns here shape how people experience the systems you build. [UX](ux.md) is the overarching quality of that experience. [Affordance](affordance.md) and [User Feedback](user-feedback.md) are the mechanisms by which an interface communicates with its user. [Accessibility](accessibility.md) ensures the experience works for people with a range of abilities. [Internationalization](internationalization.md) and [Localization](localization.md) extend the experience across languages and cultures.

In agentic coding workflows, these patterns matter in two directions. First, agents can generate interfaces quickly, but a generated interface that ignores accessibility or feedback is worse than no interface at all. Second, the agent itself is a human-facing system: every prompt response, every error message, every progress indicator is a UX decision. Understanding these patterns helps you build better software *and* direct agents more effectively.

This section contains the following patterns:

- [UX](ux.md) — The overall quality of the user's interaction with the system.
- [Affordance](affordance.md) — A property of an interface that suggests how it should be used.
- [User Feedback](user-feedback.md) — How the system tells a human what happened and what to do next.
- [Accessibility](accessibility.md) — Designing software so people with a range of abilities can use it.
- [Internationalization](internationalization.md) — Designing software to adapt to different languages and regions.
- [Localization](localization.md) — The actual adaptation of an internationalized system to a locale.

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