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interaction-router

Use this skill whenever a design task involves what users *can do* and what happens when they do it — affordances, feedback, errors, undo, confirmation, target sizing, keyboard handling, modal vs. non-modal decisions, destructive actions, validation. Trigger when the user mentions buttons, forms, validation, error states, loading states, drag-and-drop, undo, confirmation dialogs, keyboard shortcuts, target sizes, "users keep deleting things," misclicks, or "should this be a popover or a dialog." Framework-agnostic. Routes the model to the right interaction principle in this plugin.

plugins/HDeibler/universal-design-principles/plugins/interaction-and-control-principles/skills/interaction-router/SKILL.md

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Last checked
Nov 4, 2026

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1,537
Repository last updated
Nov 7, 2026
License
Apache-2.0

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# Interaction & control — router

This plugin holds the principles that govern interaction: what is clickable, what happens when it's clicked, how mistakes are prevented and recovered. They apply to web, mobile, desktop, voice, and physical product interfaces.

## Principles in this plugin

Each principle has its own skill (with sub-aspect skills where useful). Principles marked **[full]** have reference-grade skill files; the rest are planned and will be added in subsequent passes.

### Affordance and target sizing

- **`affordance`** *[full]* — visual and behavioral cues that suggest how an element is used.
  - Sub-skills: `affordance-buttons-vs-links`, `affordance-disabled-states`, `affordance-non-obvious-targets`.
- **`constraint`** — limit interactions to those that are valid in context.
- **`fitts-law`** *[full]* — time to acquire a target depends on its size and distance.