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