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anthropic-ui-skills

Original：🇺🇸 English

Translated

Anthropic's UI design system. Use when building interfaces inspired by Anthropic's aesthetic - light mode, Inter font, 4px grid.

3installs

Sourceihlamury/design-skills

Added on2026-02-07

NPX Install

npx skill4agent add ihlamury/design-skills anthropic-ui-skills

Tags

Translated version includes tags in frontmatter

anthropic-ui design-system ui-guidelines interface-design accessibility

SKILL.md Content

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Anthropic UI Skills

Opinionated constraints for building Anthropic-style interfaces with AI agents.

When to Apply

Reference these guidelines when:

Building light-mode interfaces
Creating Anthropic-inspired design systems
Implementing UIs with Inter font and 4px grid

Colors

SHOULD use light backgrounds for primary surfaces
MUST use
```
#ECE9E0
```
as page background (
```
surface-base
```
)
SHOULD limit color palette to 8 distinct colors
MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
`surface-base`	#ECE9E0	rgb(236,233,224)	Page background
`surface-raised`	#DBD1C0	rgb(219,209,192)	Cards, modals, raised surfaces
`surface-overlay`	#0F0F10	rgb(15,15,16)	Overlays, tooltips, dropdowns
`text-primary`	#625F59	rgb(98,95,89)	Headings, body text
`text-secondary`	#9F9F9C	rgb(159,159,156)	Secondary, muted text
`text-tertiary`	#454036	rgb(69,64,54)	Additional text

Typography

MUST use
```
Inter
```
as primary font family
SHOULD use single font family for consistency
MUST use
```
68px
```
/
```
700
```
for primary headings
MUST use
```
33px
```
/
```
semi_bold
```
for body text
SHOULD reduce font weights (currently 5 detected)
MUST use
```
text-balance
```
for headings and
```
text-pretty
```
for body text
SHOULD use
```
tabular-nums
```
for numeric data
NEVER modify letter-spacing unless explicitly requested

Text Styles

Style	Font	Size	Weight	Color	Count
`heading-1`	Inter	68px	700	#201F1D	1
`body`	Inter	33px	semi_bold	#35312A	1
`text-23px`	Inter	23px	500	#403D37	1
`text-21px`	Inter	21px	400	#3D362C	1
`text-21px`	Inter	21px	400	#3B352B	1
`text-20px`	Inter	20px	400	#494237	1
`text-17px`	Inter	17px	500	#423F3B	1
`text-16px`	Inter	16px	400	#454036	1
`text-14px`	Inter	14px	500	#3F3931	1
`text-14px`	Inter	14px	400	#A2A3A0	1

Typography Reference

Font Families:

```
Inter
```
(used 16x)

Font Sizes: 10px, 11px, 14px, 16px, 17px, 20px, 21px, 23px, 33px, 68px

Spacing

MUST use 4px grid for spacing
SHOULD use spacing from scale: 3px, 4px, 5px, 6px
SHOULD use 5px as default gap between elements
NEVER use arbitrary spacing values (use design scale)
SHOULD maintain consistent padding within containers

Borders

MUST use border-radius from scale: 3px, 15px
SHOULD use 3px as default border-radius
NEVER use arbitrary border-radius values (use design scale)
SHOULD use subtle borders (1px) for element separation

Border Radius Reference

Scale: 3px, 15px

Layout

MUST design for 1920px base viewport width
SHOULD use consistent element widths: 10px, 18px, 146px, 579px
SHOULD maintain text-heavy layout with clear hierarchy
NEVER use
```
h-screen
```
, use
```
h-dvh
```
for full viewport height
MUST respect
```
safe-area-inset
```
for fixed elements
SHOULD use
```
size-*
```
for square elements instead of
```
w-*
```
+
```
h-*
```

Detected Layout Patterns

Main Content: width: 1920px, height: 1004px
Main Content: width: 1920px, height: 673px

Components

MUST use
```
0px
```
height for input fields

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#9F9F9C	none	-	-

Inputs

Height:
```
0px
```

Interactive States

Focus

MUST use
```
2px
```
outline with accent color (
```
#5E6AD2
```
)
MUST use
```
2px
```
outline-offset
NEVER remove focus indicators

Hover

Buttons (primary): lighten background by 10%
Buttons (secondary): use
```
#DBD1C0
```
background
List items: use
```
#DBD1C0
```
background

Disabled

MUST use
```
opacity: 0.5
```
MUST use
```
cursor: not-allowed
```

Interaction

MUST use an
```
AlertDialog
```
for destructive or irreversible actions
SHOULD use structural skeletons for loading states
MUST show errors next to where the action happens
NEVER block paste in
```
input
```
or
```
textarea
```
elements
MUST add an
```
aria-label
```
to icon-only buttons

Animation

NEVER add animation unless it is explicitly requested
MUST animate only compositor props (
```
transform
```
,
```
opacity
```
)
NEVER animate layout properties (
```
width
```
,
```
height
```
,
```
top
```
,
```
left
```
,
```
margin
```
,
```
padding
```
)
SHOULD use
```
ease-out
```
on entrance animations
NEVER exceed
```
200ms
```
for interaction feedback
SHOULD respect
```
prefers-reduced-motion
```

Performance

NEVER animate large
```
blur()
```
or
```
backdrop-filter
```
surfaces
NEVER apply
```
will-change
```
outside an active animation
NEVER use
```
useEffect
```
for anything that can be expressed as render logic