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A Claude Code skill is a reusable set of instructions and reference material that Claude can apply to a task. For a frontend project, you can store one in .claude/skills/<name>/SKILL.md, invoke it with /<name>, or let Claude select it when the current request matches its description.
That mechanism can make UI work more repeatable, but the headline claim that a skill “fixed” an app does not, by itself, identify the app, the defect, the skill, the edits, or the verification. Treat the anecdote as a report that needs those details from its author. The workflow below shows what you can establish and reproduce yourself without promising a visual result that has not been checked.
What a Claude Code skill is
A skill packages task-specific expertise for Claude Code. Its instructions can describe a workflow, constraints, coding conventions, inspection steps, and reference material. Instead of restating that guidance in every prompt, you keep it in a named skill that Claude can use whenever the task calls for it.
For a project-level skill, the documented location is a directory under .claude/skills/ with a SKILL.md file inside it. The directory name becomes the skill name. The file is written as instructions Claude can follow, rather than as an executable program.
What a skill does and does not do
- It does: provide a repeatable procedure, project context, design rules, and checks for a class of tasks.
- It can: be called explicitly with a slash command or selected when Claude determines that the request matches its description.
- It does not: guarantee a polished interface, correct code, passing tests, or a particular visual outcome.
- It still requires: an actual inspection of the application and a human or automated check of the resulting behavior.
A skill is therefore closer to a durable playbook than to a one-click UI repair tool. Its quality depends on how clearly the workflow is written and how carefully the resulting changes are checked.
What the UI-fix anecdote establishes—and what it does not
A first-person headline can be useful evidence that someone found a skill workflow valuable, but it is not enough to reconstruct the fix. The headline does not tell us which application was involved, whether the defect was visual or functional, what skill was used, which files changed, or what test confirmed the result.
Do not convert that missing information into invented specifics. A responsible account should name the framework, route or component, viewport or device context, observed defect, exact change, and the check performed afterward. If any of those details are unavailable, describe them as unresolved rather than implying that the official documentation verifies the personal result.
Official material does verify a reusable skill mechanism and lists a UI-oriented skill named frontend-design for creating polished UI components. That listing makes it a useful example for frontend work; it does not prove that it was the skill behind a particular author’s app fix.
Decide what your frontend skill should accomplish
Start with a narrowly repeatable job. “Improve the UI” is too broad for a reliable skill because it does not tell Claude what to inspect, what to preserve, or how to judge success.
Choose a bounded task
Good candidates have a recognizable trigger and a checkable outcome, such as:
- tightening responsive layout behavior at specified viewport widths;
- applying a consistent style to a family of components;
- auditing spacing, typography, and interaction states on one route;
- bringing a new component into an existing design system without changing its public API.
Describe the task in terms of the user-visible behavior and the code boundaries. Name the route, component family, framework conventions, and files that should remain untouched when those constraints matter.
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A useful skill tells Claude what “good” means and what it must not do. Consider constraints such as:
- the supported browsers or device widths you will check;
- the existing component and token system to reuse;
- whether new dependencies are prohibited;
- accessibility requirements, including keyboard operation and focus visibility;
- the command used to run the app and the checks used to validate it;
- limits on changing data fetching, routing, or public component interfaces.
These details turn a general design request into a repeatable engineering workflow.
Create a project skill in Claude Code
The simplest setup keeps the skill in the repository that needs it. The documented path is .claude/skills/<name>/SKILL.md. Replace <name> with a clear, lowercase name that describes the job.
1. Make the directory
From the project root, create a directory such as:
.claude/skills/ui-tighten/Keeping the skill beside the application makes its workflow available to collaborators who work from that repository. It also lets the instructions refer to the project’s own scripts, components, and conventions.
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Create .claude/skills/ui-tighten/SKILL.md. The official example uses frontmatter with a name and description. It also shows usage-related fields such as an argument hint and allowed tools; treat those additional fields as optional controls whose exact behavior should be checked against the current documentation.
---
name: ui-tighten
description: Inspect one frontend route, make a focused responsive UI improvement, and verify the result without changing unrelated behavior.
argument-hint: route or component to inspect
allowed-tools: Read, Edit, Grep
---
# UI tightening workflow
1. Identify the requested route or component and read its existing styles, tests, and nearby shared components.
2. Describe the current behavior before editing: viewport, visible defect, and the smallest useful change.
3. Reuse existing design tokens and components. Do not add a dependency unless the user explicitly asks for one.
4. Make the smallest coherent edit. Preserve data flow, routing, and public component interfaces.
5. Check keyboard access, focus visibility, text wrapping, and the responsive widths named by the user.
6. Run the project's documented checks and report files changed, checks run, and any remaining uncertainty.The example is deliberately procedural. It tells Claude how to inspect the app, how to constrain edits, and what evidence to report. Replace the checks and conventions with those used by your application; do not claim that a check ran unless it actually did.
3. Make the description discoverable
Claude may use a skill when the task context matches its description. A precise description helps it recognize the right situations. Mention the kind of work, the scope, and the expected outcome rather than using a vague label such as “frontend helper.”
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4. Keep instructions actionable
Write directions as operations Claude can perform or observations it can report. “Use the existing spacing scale” is actionable when the repository defines that scale. “Make it beautiful” is not. Point to the relevant files or commands when the project has a known convention, and state what to do when a required detail is missing.
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You have two activation paths. They are complementary rather than a ranking of quality.
| Activation method | How it works | When it is useful |
|---|---|---|
| Direct invocation | Type the skill’s slash name, such as /ui-tighten, in Claude Code. |
Use when you want to make the skill choice explicit for a particular task. |
| Context-based activation | Describe the task normally; Claude may select a relevant skill when the request matches its description. | Use when the skill is a natural fit and you prefer Claude to choose based on the task context. |
Direct invocation workflow
- Open Claude Code at the project root that contains
.claude/skills/ui-tighten/SKILL.md. - Invoke the skill with
/ui-tighten. - State the concrete target, such as a route or component, and include the viewport, device, or interaction problem you observed.
- Tell Claude what must remain unchanged, including data behavior, public interfaces, and dependency policy.
- Ask it to inspect the current implementation before editing and to report its proposed change.
- Review the diff, run the project’s checks, and inspect the result in the app’s own context.
The slash invocation selects the workflow; it does not replace the task description. Claude still needs the app-specific facts that are not encoded in the skill.
Context-based activation workflow
If you do not invoke a skill explicitly, describe the work in ordinary language and make the request specific enough to match the skill description. For example, identify the route, the responsive symptom, the design constraints, and the checks you expect. If Claude does not select the skill, invoke it directly instead of assuming that an unmentioned workflow was applied.
Use a skill to investigate a UI problem safely
A frontend skill should guide an investigation, not jump straight to cosmetic edits. The following sequence keeps the work tied to observable behavior.
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1. Capture the before state
Record the route or component, framework, viewport or device context, and the exact symptom. “The card feels cramped” is less useful than “At the named narrow viewport, the action row wraps and the primary button leaves the card.” Capture a screenshot or reproducible description when your normal development process allows it.
2. Inspect the implementation
Have Claude read the relevant component, styles, shared tokens, and nearby tests before editing. Ask it to identify whether the symptom comes from layout rules, content, state, or an interaction. This prevents a visual workaround from masking a functional cause.
3. Propose the smallest coherent change
Require a short explanation of the proposed files and why they are sufficient. A skill can direct Claude to reuse existing components and tokens, avoid unrelated refactors, and preserve public interfaces. If the proposal changes routing, data fetching, or behavior outside the stated scope, stop and narrow it.
4. Implement and inspect the diff
Review the actual edits rather than relying on the skill’s summary. Check selectors, breakpoints, state styles, semantic markup, and any generated or copied code. Confirm that the change is located in the intended component or shared primitive.
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Open the affected route in the project’s normal development environment. Check the viewport or device conditions that exposed the problem, plus adjacent widths and relevant states such as hover, focus, loading, empty, and error states when they apply. A static diff cannot establish that a layout behaves correctly in the browser.
6. Run appropriate automated checks
Run the repository’s documented tests, linting, type checks, or build command that covers the edited code. Report exactly which checks ran and their results. If no automated check covers the visual behavior, say so and rely on the documented manual inspection instead of implying test coverage.
Project skills and plugin-provided skills
The delivery context changes how a skill is maintained and shared. It does not establish that one type is inherently better.
| Aspect | Project skill | Plugin-provided skill |
|---|---|---|
| Location or delivery | Stored in the repository under .claude/skills/<name>/SKILL.md. |
Provided through an enabled plugin with its own skill directory and packaging structure. |
| Primary scope | Encodes the workflow and conventions of one project or repository. | Distributes a reusable capability beyond one repository through the plugin. |
| Best fit | Team-specific UI rules, scripts, architecture, and acceptance checks. | General-purpose capabilities that multiple projects can enable. |
| Maintenance concern | Keep instructions aligned with repository code and review them with project changes. | Keep the plugin package and its compatibility with the current Claude Code behavior up to date. |
The official plugin structure guidance also uses a directory containing SKILL.md and describes task-context matching. For a first skill, start with the project layout; consider plugin packaging when you have a reason to distribute the workflow across projects.
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Where the official frontend-design skill fits
Anthropic’s official plugin reference lists frontend-design as a skill intended for creating polished UI components. That makes it a verified example of a UI-oriented skill, not evidence about the unnamed skill in a personal app-fix story.
Best Value
You can use the same evaluation discipline with an official or project skill: identify the component and constraints, inspect the existing app, review the edits, and verify the result at the relevant widths and states. The label alone is not a substitute for checking the generated work.
Legacy commands and compatibility
Anthropic’s command-development guidance recommends .claude/skills/<name>/SKILL.md for new skills while noting that the older .claude/commands/ Markdown format remains loaded compatibly. If a repository already uses a command file, you do not have to rewrite it immediately to understand the workflow. For new work, use the documented skills path and check the current Claude Code documentation before relying on version-specific behavior.
Compatibility does not remove the need to inspect the file’s instructions. Whether the workflow arrived through a legacy command, a project skill, or a plugin, the same questions apply: what does it ask Claude to do, what files may it change, and how is success verified?
Troubleshoot a skill that seems ineffective
Claude does not select the skill automatically
Invoke it explicitly with its slash name. Then improve the description so it names the task and scope clearly. Automatic selection is context-based; it is not a guarantee that every vaguely related request will activate the skill.
The skill runs but edits the wrong area
Specify the route, component, and boundaries in your request, then tighten the skill’s instructions to require inspection before editing. Add a rule to preserve unrelated behavior and ask for a proposed file list before implementation.
The visual change is inconsistent with the app
Tell the skill to reuse the repository’s existing tokens and shared components. Point it to the source of truth for spacing, typography, colors, and breakpoints. Review whether the change bypassed an established primitive or introduced one-off values.
The result looks correct at one width but fails elsewhere
Include the reproducing viewport and require checks at adjacent widths. Test content that is longer or shorter than the example, and inspect focus and interaction states. A single screenshot cannot establish responsive correctness.
The code change is plausible but unverified
Run the project’s relevant checks and open the route in the running app. Record what was actually observed. If you cannot run the app or a check, state that limitation rather than reporting success.
Document the result so the workflow improves
After each UI task, keep a concise record of:
- the framework and app area changed;
- the before symptom and the viewport or device context;
- the files and specific behavior changed;
- the manual checks performed;
- the automated commands run and their outcomes;
- any remaining uncertainty or follow-up.
This record lets you refine the skill when it repeatedly misses a constraint. It also keeps a future account honest: readers can distinguish an observed fix from an instruction that merely suggested one.
Bottom line for using Claude Code skills on UI work
Put a focused workflow in .claude/skills/<name>/SKILL.md, give it a precise description, invoke it directly when you want an explicit choice, and let context-based activation handle suitable requests when that is convenient. Use a project skill for repository-specific conventions; use a plugin-provided skill when you need distribution across projects. A UI-oriented skill can structure inspection and implementation, but only your app-specific before-and-after evidence can show whether the interface was actually fixed.
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