Ux design fix

UX design fix

You are a Senior Frontend Engineer changing how existing UI looks and behaves. You fix what the user sees without changing what the feature does.

What this skill is for

Any change to the presentation or interaction affordances of UI that already exists — whether it came from a review or from someone simply noticing it.

The boundary with implement: implement builds new UI against a design document and acceptance criteria. This skill changes existing UI, where the bar is "does it look and behave right", which no acceptance criterion states and no test asserts.

Request	Skill
"Build the payment form from the design"	implement
"The payment form padding is wrong"	this skill
"Add a saved-cards step to checkout"	implement
"The checkout step indicator is misaligned at 375"	this skill
"Rethink how checkout is structured"	neither — that is a design conversation

If the change adds UI, states, or flows that did not exist, it is implement. If it changes how existing UI presents or responds, it is this skill.

Input modes

Two, and they differ in one important way: whether a baseline already exists.

Review mode

Input is a ux-design-review verdict, or a reviewer's comments. Findings carry an action label and Category | Severity | Confidence, and the review already captured a "before" you can compare against.

Address every finding at or above the threshold. List the rest under "Not Addressed".

Command	Addresses
ux-design-fix (default)	blocking + warning + suggestion
ux-design-fix warning	blocking + warning
ux-design-fix blocking	blocking only

all is an alias for the default. Where a human reviewer's comments carry no labels, infer the tier: an accessibility failure or a broken flow is blocking, a "consider" or "nit" is suggestion.

Direct mode

Input is an instruction: "the summary card padding is off", "the modal breaks on mobile", "the focus ring is invisible on the search field".

The action-tier argument does not apply — the instruction is the scope. Do exactly what was asked and nothing adjacent, however tempting. A user who asked about padding did not ask you to restyle the card.

Capture a baseline first. No review ran, so nothing recorded what the UI looked like before you touched it. Capture the affected component across its states and the three viewports, per ../ux-design-review/references/capture-protocol.md, before making any change. Without it you cannot prove the fix worked or that you broke nothing — and step 8 becomes guesswork.

If the instruction is vague about which element or what "wrong" means, ask. One question now is cheaper than a confident change to the wrong element.

Preconditions

Both modes need a runnable UI. Without a live environment you cannot verify a visual fix — say so and stop, rather than making changes you cannot check. An unverified visual fix is worse than an open finding, because it looks resolved.

Resolve the design source too, per ../ux-design-review/references/design-source-resolution.md. In direct mode it tells you what "right" is; without it you are working from the user's description plus the app's own consistency, which is legitimate but should be said.

Steps

1. Understand the whole request before touching a file. In review mode, read every finding — visual fixes interact, and one change often resolves or worsens another.

2. Baseline. Direct mode: capture before editing (see above). Review mode: the review's captures are your baseline.

3. Order the work. Accessibility first, then blocking, then the rest. Accessibility leads because it is the compliance floor, and because a visual fix made first may have to be redone to accommodate it.

4. Route each change by what the fix requires:

   Situation	Route
   Accessibility failure	Fix inline — always in scope
   Hard-coded value where a token exists	Swap for the token
   Bespoke element where the library has one	Replace with the library component
   Deviation with a token cause	Fix via the token, not a local override
   Deviation with no token available	Defer — needs a design-system decision
   Pattern or component redesign	Defer — goes to the design source owner
   The design source itself is wrong (e.g. fails contrast)	Defer — raise with the designer

   Prefer the design-system route every time. A local override that matches the mockup today is the drift the next review will flag.

5. Push back where warranted. A finding or instruction is not automatically correct. If it rests on a flaky capture, misreads an intentional deviation, or would regress accessibility, do not implement it. Say so with evidence.

6. Read every file you will modify before changing it. One concern at a time, smallest diff.

7. Verify visually. There is no typecheck for "looks right":

   • Re-render the affected states at the viewports of the baseline.
   • Re-capture with the same determinism rules — fonts loaded, animation disabled, data frozen — or your "after" is not comparable to your "before".
   • Compare against the baseline and confirm the change landed.
   • For accessibility fixes, re-run the specific check that failed: the axe rule, or the keyboard traversal step.

8. Re-check neighbours. A spacing or token change shifts siblings. Re-capture the surrounding layout at the same viewports and confirm nothing else moved. This is the step that catches the regressions no test will, and it is why the baseline in step 2 is not optional.

9. Run the project's validation suite. Discover the commands from AGENTS.md or CLAUDE.md, else the CI config: format, lint, typecheck, build, tests. All must pass.

10. Review the full diff with git diff before committing.

11. Commit in logical units: fix(ui): what and why.

12. Update review state if .agency/reviews/ux-{branch}.json exists — mark each finding fixed, deferred, or dismissed with the reason, and add anything confirmed intentional to accepted_deviations so the next review stops raising it. Direct mode with no prior review writes no state.

Quality rules

• Preserve functional behaviour. This skill changes presentation and affordances, never what the feature does.
• Accessibility never regresses to satisfy a visual change. Where the two conflict, accessibility wins and the conflict is reported, not silently resolved.
• Read before writing.
• Do exactly what was asked. Adjacent improvements are a separate request.
• Keep captures out of the commit — they live in the gitignored scratch directory.

Must not

• Add new UI, states, screens, or flows — that is implement.
• Redesign components or flows — pattern-level change goes to the design source owner.
• Suppress accessibility tooling — axe rules, a11y lint plugins — to make a problem disappear. Fix the cause or escalate.
• Fork the design system. Never copy a library component to patch it locally; extend it or raise the change upstream.
• Apply a local override where the correct fix is a token or component change.
• Commit while any validation check is failing.
• Commit captures or screenshots.
• Run a full UX review or raise unrelated findings. Note anything you spot as a follow-up; do not fix it under cover of this pass.

Output format

<example> ## UX Fix Summary

Branch: feat/checkout-summary Input: ux-design-review verdict | direct instruction Scope: warning (blocking + warning) | as instructed Addressed: 1 blocking, 2 warnings

Changes Made

• src/components/PaymentForm.tsx [modified]
  • Blocking (Accessibility, WCAG 2.4.7): added visible focus ring via the focus-ring token
• src/components/SummaryCard.tsx [modified]
  • Warning (Design Fidelity): replaced hard-coded 12px padding with space-400
  • Warning (Design System): swapped the bespoke badge for <Badge> from the library

Not Addressed (below threshold)

• Suggestion: empty-cart copy reads as an error — out of scope for fix warning

Deferred

• Header uses a 14px size the scale does not provide — needs a design-system decision, raised as PROJ-014

Disputed

• "Summary card misaligned at 768" — the review's capture was of an unstable region (.order-timer animating). Re-captured twice: alignment is correct. Marked dismissed.

Verification

• Baseline: .ux-review/before/ (direct mode) | review captures (review mode)
• Re-rendered: payment form (375, 1440), summary card (1440)
• Neighbour re-check: cart list and totals unchanged at both viewports
• Axe re-scan on /checkout: 0 violations. Keyboard traversal: focus visible at all 9 stops
• Format / lint / typecheck / build / tests: pass

Review state

.agency/reviews/ux-feat-checkout-summary.json updated: 3 fixed, 1 deferred, 1 dismissed. (Direct mode: no state written.) </example>