Phoenix Frontend Development
Composable rules for building UI in the Phoenix app. Before starting work, explore js/app/src/components/ and js/app/package.json to understand existing patterns, packages, and conventions — then follow these rules.
Reference Files
Read the relevant file(s) based on the task:
| Reference | When to read |
|---|---|
references/components.md | Creating, composing, or refactoring components |
references/relay.md | Using Relay |
references/accessibility.md | Any interactive element, form, overlay, or semantic markup |
references/test-ids.md | Adding or changing data-testid attributes for E2E tests |
references/resize-svg-logo-assets.md | Adding or updating provider/integration logo icons |
Storybook
For any change to js/app/stories/ or js/app/.storybook/ — including stories that accompany a component change — use the phoenix-storybook skill.
PXI data changes
When a PXI write changes the membership or filters of a mounted Relay query, use useAgentDataChangeFetchKey from @phoenix/hooks in the query owner. See references/relay.md for the event and fetch policy convention.
Verification
After visual changes, use the available browser tooling to verify the UI looks correct. When modifying a shared component, check its usages across the app.
Route Metadata
When adding, removing, renaming, or materially changing what a page contains, update the route's handle.agentRoute metadata in js/app/src/Routes.tsx if an assistant agent should be able to link users to that destination. Keep metadata small and search-oriented:
label: human page name.description: concise page purpose based on what the page now contains, including user phrases PXI might hear when looking for that page.
If a content change makes an existing route easier or harder to find by natural language, adjust description in the same change.
URL State
Significant view state must be recreatable from the URL. If a user can select a tab, sub-view, or detail state that should survive reloads, sharing, or adjacent-record pagination, encode it in route params or search params and preserve the relevant URL state during navigation.
