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Ash UI Agent Guide

Use this guide for repository-wide work. The package-local Spec Led Development workspace in .spec/ is the current-truth source for intent, requirements, and verification targets.

First Read

  1. Read .spec/README.md.
  2. Read .spec/AGENTS.md before editing .spec/.
  3. Read the subject specs under .spec/specs/ that match the files you are changing.
  4. Read README.md for the public package shape.
  5. For example-suite work, also read examples/README.md, examples/scaffold_contract.md, and examples/ash_hq_theme_baseline.md.

Project Shape

  • Ash UI is resource-first. Screen and element Ash resources using AshUI.Resource.DSL.Screen and AshUI.Resource.DSL.Element are the authoritative authoring units.
  • AshUI.Resource.Authority derives and persists the Screen.unified_dsl snapshot from the resource graph. Do not ask applications to hand-author runtime snapshots when resource authority can produce them.
  • Relationships define UI composition. Preserve relationship order, kind, slot, placement, inline fragments, and screen-scoped bindings.
  • AshUI.Compiler compiles persisted screens and resource-authority payloads to AshUI.Compilation.IUR; AshUI.Rendering.IURAdapter converts internal IUR to %UnifiedIUR.Element{} canonical renderer-facing IUR.
  • Navigation intent is semantic and host-independent. Resource-authored navigation declarations may use symbolic screens, destinations, modals, params, metadata, payload mappings, and binding refs, but must not include route/path/URL/helper/module/runtime stack fields.
  • Styling intent is semantic. Resources may declare class hooks, variants, renderer-read props, and dynamic inline style values; host apps own concrete theme tokens, CSS, shell treatment, and responsive layout.
  • Runtime work is actor-aware. Binding evaluation, LiveView events, screen mounts, actions, and resource access must pass through the authorization and policy surfaces when applicable.
  • Legacy builder/document support is migration-only. Do not reopen builder-first or document-first payloads as supported runtime compiler inputs.

Spec Led Workflow

  • At session start, try mix spec.prime --base HEAD.
  • After code, docs, or tests change, try mix spec.next; use mix spec.next --bugfix for bug fixes.
  • If mix spec.next reports subject updates, update the named .spec/specs/*.spec.md file before finishing.
  • When the spec loop says ready, run mix spec.check --base HEAD or the base requested by the task.
  • In this checkout, the spec.* Mix tasks may not be wired into mix.exs. If a spec task is unavailable, record that fact in your handoff and run the closest targeted verification from the relevant spec instead.
  • Keep .spec files as current-state documents. Use Git history and PRs for the change log.

Implementation Rules

  • Prefer existing AshUI.Resource.DSL.*, AshUI.Resource.Info, AshUI.Resource.Authority, AshUI.Config, runtime, compiler, rendering, and telemetry modules over new parallel abstractions.
  • Keep storage boundaries configurable through AshUI.Config; do not hard-code the default domain, resources, repo, or runtime domain into shared logic.
  • Keep bindings typed as value, list, or action flows with structured source maps and explicit targets. Preserve transform, bidirectional write, list paging/update, and action execution semantics.
  • Preserve renderer selection semantics: registry availability is not the same as adapter fallback renderability.
  • Preserve canonical navigation transport. Use AshUI.Navigation.Intent, AshUI.Rendering.CanonicalIUR, and AshUI.Runtime.Navigation instead of adding route-specific or renderer-specific navigation fields to resources.
  • Emit or preserve canonical ash_ui telemetry events for authoring, screen, binding, compilation, rendering, authorization, and migration flows when those paths change.
  • Return structured errors for authorization, compilation, binding, rendering, and LiveView runtime failures rather than crashing sessions.

Example Suite Rules

  • Every checked-in example under examples/<directory>/ is a standalone Mix project.
  • Preserve sibling unified_ui/examples directory names as stable review handles, even when Ash UI normalizes the canonical subject type.
  • Author examples as one screen resource plus related element resources, with app-local UI storage resources and persistence through AshUI.Resource.Authority.create/2.
  • Keep the shared Ash HQ baseline in sync across examples/ash_hq_theme_* and app-local shell hooks.
  • Every example must expose a reviewer-visible Meaningful Interaction Story and Canonical Signal Preview.

Verification

  • Use the exact targeted mix test ... commands listed in the relevant .spec/specs/*.spec.md verification block when behavior changes.
  • Useful root commands include mix test, mix format --check-formatted, mix ash_ui.examples.validate, mix ash_ui.examples.report, and bash ./scripts/validate_specs_governance.sh.
  • For example review workflows, use mix ash_ui.examples.list, mix ash_ui.examples.preview <directory>, and mix ash_ui.examples.start <directory> --dry-run.
  • Treat generated _build/, deps/, tutorial dependency, and report artifacts as unrelated unless the task explicitly targets them.