---
title: "Agent Skill to Frontend Skill: 21St Ui Review"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/skill-21st-ui-review"
modality: "SKILL"
category: "Frontend & Motion Design"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# Agent Skill to Frontend Skill: 21St Ui Review

**Summary:** Agent Skill to Frontend Skill: 21St Ui Review is a verified SKILL blueprint on Promptally in Frontend & Motion Design optimized for leading AI models. Review existing UI against the project's design context, accessibility expectations, responsive behavior, interaction quality, and high-confidence production rules. Use for UI audits, design QA, frontend review, accessibility review, consistency checks, or requests to find and safely fix visual defects. Trigger for requests such as "review this UI", "audit this page", "find design issues", "check responsiveness", or "fix obvious UX problems". Use 21st-ui-build when the request is prima. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | SKILL |
| Category | Frontend & Motion Design |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 552 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

````md
---
name: 21st-ui-review
description: Review existing UI against the project's design context, accessibility expectations, responsive behavior, interaction quality, and high-confidence production rules. Use for UI audits, design QA, frontend review, accessibility review, consistency checks, or requests to find and safely fix visual defects. Trigger for requests such as "review this UI", "audit this page", "find design issues", "check responsiveness", or "fix obvious UX problems". Use 21st-ui-build when the request is primarily to create new UI.
---

# Review UI with evidence

Separate deterministic defects from subjective design recommendations.

## Workflow

1. Read `.21st/design.json`, project instructions, and the relevant source.
2. Run the deterministic review first:

   ```bash
   21st review <path>
   21st review <path> --json
   ```

3. Inspect the actual component composition and runtime states. Validate claims
   against code rather than inferring behavior from names.
4. Group findings into:
   - deterministic defects;
   - design-system drift;
   - accessibility and interaction defects;
   - responsive risks;
   - subjective product/design recommendations.
5. Prioritize by user impact and include exact file and line attribution.
6. Use `21st review <path> --fix` only for deterministic, low-ambiguity fixes.
   Never silently redesign, change brand identity, or alter product behavior.
7. Run relevant project tests after fixes and rerun review to prove resolution.

## Review priorities

- semantic controls and accessible names;
- keyboard access, focus visibility, and dialog/menu behavior;
- image alternatives and meaningful labels;
- touch target size and disabled/loading states;
- responsive overflow and fixed-width assumptions;
- reduced-motion handling;
- hardcoded visual values that conflict with project tokens;
- duplicate primitives instead of existing components;
- inconsistent typography, radius, spacing, shadows, and icons;
- fake data, placeholder copy, or missing empty/error states.

## Output

Lead with actionable findings ordered by severity. Keep subjective suggestions
clearly labeled. If no issue is proven, say so and state what was inspected.

````

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

## Related Blueprints on Promptally
- [Agent Skill to Orch Build Mvp](https://app.promptally.dev/p/skill-orch-build-mvp)
- [Agent Skill to Dashboard Builder](https://app.promptally.dev/p/skill-dashboard-builder)
- [Agent Skill to Swiftui Patterns](https://app.promptally.dev/p/skill-swiftui-patterns)
- [Agent Skill to Motion Advanced](https://app.promptally.dev/p/skill-motion-advanced)
- [Agent Skill to React Performance](https://app.promptally.dev/p/skill-react-performance)
- [Agent Skill to Ui Demo](https://app.promptally.dev/p/skill-ui-demo)
- [Agent Skill to Liquid Glass Design](https://app.promptally.dev/p/skill-liquid-glass-design)
- [Agent Skill to Motion Patterns](https://app.promptally.dev/p/skill-motion-patterns)