tldraw-ui-skills

Tldraw UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

• SHOULD use light backgrounds for primary surfaces
• MUST use #E7EBEE as page background (surface-base)
• MUST use #0E54F0 for primary actions and focus states (accent)
• SHOULD limit color palette to 9 distinct colors
• MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
surface-base	#E7EBEE	rgb(231,235,238)	Page background
surface-raised	#F8F9FB	rgb(248,249,251)	Cards, modals, raised surfaces
surface-overlay	#0E54F0	rgb(14,84,240)	Overlays, tooltips, dropdowns
text-primary	#A3A4A6	rgb(163,164,166)	Headings, body text
text-secondary	#64686B	rgb(100,104,107)	Secondary, muted text
text-tertiary	#535353	rgb(83,83,83)	Additional text
border-default	#CBCCCE	rgb(203,204,206)	Subtle borders, dividers
accent	#0E54F0	rgb(14,84,240)	Primary actions, links, focus

Typography

• MUST use Inter as primary font family
• SHOULD use single font family for consistency
• MUST use 14px / 500 for primary headings
• MUST use 12px / 400 for body text
• MUST limit font weights to: regular, medium
• 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	14px	500	#5C5C5C	1
heading-2	Inter	13px	500	#4E4F51	1
heading-3	Inter	12px	500	#6A6A6A	1
body	Inter	12px	400	#535353	1
body-secondary	Inter	12px	400	#616161	1
body-secondary	Inter	12px	400	#96C4F4	1
text-10px	Inter	10px	400	#A3A4A6	1
caption	Inter	9px	400	#64686B	1
label	Inter	7px	400	#A6A7A9	1

Typography Reference

Font Families:

• Inter (used 9x)

Font Sizes: 7px, 9px, 10px, 12px, 13px, 14px

Spacing

• MUST use 4px grid for spacing
• SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 18px, 22px
• SHOULD use 2px 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: 0px, 3px, 4px, 6px, 7px, 9px
• MUST use 1px border width consistently
• SHOULD use 6px 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: 0px, 3px, 4px, 6px, 7px, 9px

Layout

• MUST design for 1920px base viewport width
• SHOULD use consistent element widths: 16px, 12px, 96px, 13px, 32px
• 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: 965px
• Main Content: width: 1920px, height: 593px

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#A3A4A6	none	-	-

Interactive States

Focus

• MUST use 2px outline with accent color (#0E54F0)
• MUST use 2px outline-offset
• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%
• Buttons (secondary): use #F8F9FB background
• List items: use #F8F9FB 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