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:
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
1---2name: tldraw-ui-skills3description: Tldraw's UI design system. Use when building interfaces inspired by Tldraw's aesthetic - light mode, Inter font, 4px grid.4license: MIT5---6
7# Tldraw UI Skills
8
9Opinionated constraints for building Tldraw-style interfaces with AI agents.
10
11## When to Apply
12
13Reference these guidelines when:
14- Building light-mode interfaces
15- Creating Tldraw-inspired design systems
16- Implementing UIs with Inter font and 4px grid
17
18## Colors
19
20- SHOULD use light backgrounds for primary surfaces
21- MUST use `#E7EBEE` as page background (`surface-base`)
22- MUST use `#0E54F0` for primary actions and focus states (`accent`)
23- SHOULD limit color palette to 9 distinct colors
24- MUST maintain text contrast ratio of at least 4.5:1 for accessibility
25
26### Semantic Tokens
27
28| Token | HEX | RGB | Usage |
29|-------|-----|-----|-------|
30| `surface-base` | #E7EBEE | rgb(231,235,238) | Page background |
31| `surface-raised` | #F8F9FB | rgb(248,249,251) | Cards, modals, raised surfaces |
32| `surface-overlay` | #0E54F0 | rgb(14,84,240) | Overlays, tooltips, dropdowns |
33| `text-primary` | #A3A4A6 | rgb(163,164,166) | Headings, body text |
34| `text-secondary` | #64686B | rgb(100,104,107) | Secondary, muted text |
35| `text-tertiary` | #535353 | rgb(83,83,83) | Additional text |
36| `border-default` | #CBCCCE | rgb(203,204,206) | Subtle borders, dividers |
37| `accent` | #0E54F0 | rgb(14,84,240) | Primary actions, links, focus |
38
39## Typography
40
41- MUST use `Inter` as primary font family
42- SHOULD use single font family for consistency
43- MUST use `14px` / `500` for primary headings
44- MUST use `12px` / `400` for body text
45- MUST limit font weights to: regular, medium
46- MUST use `text-balance` for headings and `text-pretty` for body text
47- SHOULD use `tabular-nums` for numeric data
48- NEVER modify letter-spacing unless explicitly requested
49
50### Text Styles
51
52| Style | Font | Size | Weight | Color | Count |
53|-------|------|------|--------|-------|-------|
54| `heading-1` | Inter | 14px | 500 | #5C5C5C | 1 |
55| `heading-2` | Inter | 13px | 500 | #4E4F51 | 1 |
56| `heading-3` | Inter | 12px | 500 | #6A6A6A | 1 |
57| `body` | Inter | 12px | 400 | #535353 | 1 |
58| `body-secondary` | Inter | 12px | 400 | #616161 | 1 |
59| `body-secondary` | Inter | 12px | 400 | #96C4F4 | 1 |
60| `text-10px` | Inter | 10px | 400 | #A3A4A6 | 1 |
61| `caption` | Inter | 9px | 400 | #64686B | 1 |
62| `label` | Inter | 7px | 400 | #A6A7A9 | 1 |
63
64### Typography Reference
65
66**Font Families:**
67- `Inter` (used 9x)
68
69**Font Sizes:** 7px, 9px, 10px, 12px, 13px, 14px
70
71## Spacing
72
73- MUST use 4px grid for spacing
74- SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 18px, 22px
75- SHOULD use 2px as default gap between elements
76- NEVER use arbitrary spacing values (use design scale)
77- SHOULD maintain consistent padding within containers
78
79## Borders
80
81- MUST use border-radius from scale: 0px, 3px, 4px, 6px, 7px, 9px
82- MUST use 1px border width consistently
83- SHOULD use 6px as default border-radius
84- NEVER use arbitrary border-radius values (use design scale)
85- SHOULD use subtle borders (1px) for element separation
86
87### Border Radius Reference
88
89**Scale:** 0px, 3px, 4px, 6px, 7px, 9px
90
91## Layout
92
93- MUST design for 1920px base viewport width
94- SHOULD use consistent element widths: 16px, 12px, 96px, 13px, 32px
95- NEVER use `h-screen`, use `h-dvh` for full viewport height
96- MUST respect `safe-area-inset` for fixed elements
97- SHOULD use `size-*` for square elements instead of `w-*` + `h-*`
98
99### Detected Layout Patterns
100
101- **Main Content**: width: 1920px, height: 965px
102- **Main Content**: width: 1920px, height: 593px
103
104## Components
105
106### Buttons
107
108| Variant | Background | Text | Border | Height | Radius |
109|---------|------------|------|--------|--------|--------|
110| Ghost | transparent | #A3A4A6 | none | - | - |
111
112## Interactive States
113
114### Focus
115
116- MUST use `2px` outline with accent color (`#0E54F0`)
117- MUST use `2px` outline-offset
118- NEVER remove focus indicators
119
120### Hover
121
122- Buttons (primary): lighten background by 10%
123- Buttons (secondary): use `#F8F9FB` background
124- List items: use `#F8F9FB` background
125
126### Disabled
127
128- MUST use `opacity: 0.5`
129- MUST use `cursor: not-allowed`
130
131## Interaction
132
133- MUST use an `AlertDialog` for destructive or irreversible actions
134- SHOULD use structural skeletons for loading states
135- MUST show errors next to where the action happens
136- NEVER block paste in `input` or `textarea` elements
137- MUST add an `aria-label` to icon-only buttons
138
139## Animation
140
141- NEVER add animation unless it is explicitly requested
142- MUST animate only compositor props (`transform`, `opacity`)
143- NEVER animate layout properties (`width`, `height`, `top`, `left`, `margin`, `padding`)
144- SHOULD use `ease-out` on entrance animations
145- NEVER exceed `200ms` for interaction feedback
146- SHOULD respect `prefers-reduced-motion`
147
148## Performance
149
150- NEVER animate large `blur()` or `backdrop-filter` surfaces
151- NEVER apply `will-change` outside an active animation
152- NEVER use `useEffect` for anything that can be expressed as render logic
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