harden

Overview of harden skill

What the harden skill does

The harden skill helps you make UI designs and interface specs production-ready by stress-testing them against bad data, edge cases, and real-world failures. It focuses on the cases that usually break polished mockups: empty states, network errors, long text, localization, permission issues, and other conditions that affect whether a design survives first contact with production.

Who should use it

Use harden when you are designing or reviewing a feature that will ship to real users and you need to know what happens when things go wrong. It is a strong fit for product designers, AI-assisted UI workflows, frontend teams, and anyone using harden for UI Design when a clean initial concept needs operational detail.

What makes it different

The main value of harden is decision quality. Instead of only polishing the happy path, it pushes the design to account for failure modes and content extremes that affect usability. That makes the harden guide useful when you want fewer redesign cycles, fewer “we forgot this state” bugs, and fewer layout surprises after implementation.

How to Use harden skill

Install and trigger harden

Install the skill with npx skills add pbakaus/impeccable --skill harden, then invoke it on a specific target such as a screen, flow, component, or interaction. The harden install step is only the start; the skill works best when you give it one concrete UI scope instead of a broad product goal.

Give it the right input

For good harden usage, describe the interface, the user goal, and the conditions that may fail. Better inputs name the surface area and the risky cases, for example: “Harden the checkout summary for mobile, including empty cart, promo code failure, long product names, and slow payment API states.” That is stronger than “make this production-ready” because it gives the skill enough context to produce useful edge-case coverage.

Read first, then adapt

Start with SKILL.md, then inspect README.md, AGENTS.md, metadata.json, and any related rules/, resources/, references/, or scripts/ folders if they exist in your environment. In this repository, SKILL.md is the main source of truth, so the most useful habit is to extract the hardening checklist and map it onto your own product’s UI constraints instead of copying it verbatim.

Workflow that improves results

A practical harden guide workflow is: define the target UI, list likely failure modes, check text and localization pressure, review empty and error states, then decide what must be visible, disabled, retryable, or truncated. For harden for UI Design, this usually means asking for explicit states and behavior rules, not just visual cleanup.

harden skill FAQ

Is harden only for UI design?

No. The harden skill is strongest for UI Design, but it also helps with product flows, component specs, and interface logic where edge cases affect usability. If the output is not a user-facing interface, the fit is weaker.

How is this different from a normal prompt?

A normal prompt often improves the happy path. harden is more useful when you need a structured pass over failure states, data extremes, and localization risks. That difference matters when you want the design to survive implementation rather than just look complete in review.

Is harden beginner-friendly?

Yes, if you can name a specific screen or workflow. Beginners get better results when they provide one target, a rough user goal, and a few known risks. The harden skill is less useful when the request is too vague to test.

When should I not use harden?

Do not use it when you only need a quick visual idea, a marketing mockup, or a concept that will never handle real data. If the problem is exploratory rather than production-oriented, harden adds more structure than you need.

How to Improve harden skill

Give stronger edge-case inputs

The fastest way to improve harden results is to include the cases that usually get missed: long localized strings, empty data, partial failure, permission denial, and dense content. A better prompt says what can break and where, not just what the interface should look like.

Specify constraints early

State platform, layout limits, data shape, and any behavior constraints up front. For example, say whether the design must work in mobile-first layouts, whether text must fit in one line, whether retries are allowed, and whether RTL support is required. These details help harden focus on the right tradeoffs instead of inventing defaults.

Review outputs against real failure modes

After the first pass, check whether the result covers the most likely production breaks: overflow, missing data, slow loading, invalid input, and translation length. If a state feels generic, refine the request with concrete examples rather than asking for “more detail.” That usually produces a better harden guide iteration than broad revision language.

Iterate with one screen at a time

The best harden usage is narrow. Harden one step in a flow, then reuse the pattern for adjacent screens. That keeps the output specific enough to be actionable and makes it easier to compare states across the product without losing consistency.