iii Schematic — design system

The console reads as an engineering document, not a SaaS dashboard: hierarchy comes from layered surfaces (one background step per region), the chrome draws no lines, corners use a 6/8/12px scale, and a single rationed accent marks live state and primary actions. Sans for humans, mono for machines. The code is the spec: tokens in ade/web/src/index.css, public CSS recipes in ade/web/src/styles/ui-recipes.css, components in ade/web/src/components/ui exported through packages/console-ui (index.d.ts, component-names.mjs, ui-classes.mjs, token-names.mjs, hooks.d.mts, format.d.mts). This file is the only canonical text; ade/web/DESIGN.md is a pointer to it. Workspace behaviour (panes, tabs, chords, palette, annotations) is documented in ade/web/README.md, not here.

Principles

• Surfaces, not borders. A new region is a one-step background change, never an outline or divider. Three strokes exist, each with one job: rule-focus (focus), edge (the hairline frame of floating workspace panels and the PageBody gap), and an optional neutral edge rail on a selected row or card. rule, rule-2, rule-strong are transparent legacy names.
• Consistent corners. Compact chrome uses 6px; rounded-lg is 8px for cards and controls, and rounded-xl is 12px for panels and dialogs. none and full keep their standard roles.
• Accent rationing. accent (charcoal on light, soft white on dark) is for focused controls, live/running state, primary actions and semantic data. Never for selection, body text, large fills or decoration.
• Neutral selection. Selected = surface-selected fill + ink text (+ optional edge rail), identical in both themes. Status arrives through ok/warn/alert on a dot, a mark or a -muted tint, never a solid background or a stripe.
• Sans for humans, mono for machines. Geist for copy and controls (Inter fallback); Geist Mono for IDs, timestamps, metrics, function names; the code font only on editor, terminal, pre/code.
• Motion communicates, never decorates. Shared duration/ease tokens only; streaming, logs, drag and resize update instantly; prefers-reduced-motion zeroes every token.
• Density is deliberate. Panels, traces, code and forms share a surface without a hierarchy contest; the trace timeline is the most colourful area and the only one that draws data lines (alpha-ink fills such as bg-ink/15).

Setup dialog

Setup is an 836px-wide dialog up to 780px tall (rounded-xl, 1px neutral frame, shadow-floating): a 200px neutral-50 rail on the left with the wordmark and a vertical stepper, then a scrolling body over a 56px footer with the step's actions. The stepper (Stepper.tsx) is 24px numbered dots joined by a hairline that fills as steps complete — finished steps show a check and go back on click, the current one carries aria-current="step", the ones ahead are plain text, and each step has a one-line description in the rail. Below the @lg container width the rail gives way to a one-row header stepper whose labels collapse to the current step. The console's sans (Geist, Inter fallback): 16px step titles, 14px leads, 13px rows and labels, 12px captions and 11px chips. One 24px gutter (16px below @md); rounded-lg cards with divide-y hairlines, 4px checkboxes, and pill (rounded-full) buttons and chips — solid ink primary, soft neutral fill secondary, ghost tertiary, all with semibold 13px labels. Small controls (rail steps, ghost buttons, disclosures) hover with surface-hover. Large fills — cards, rows, strips, the code surface, the soft secondary button — use the neutral palette one step per theme (neutral-50/100 on white, neutral-900/800 on neutral-950), because the alpha surface ramp reads as a grey slab across a whole card in the light theme; a checked card is neutral-100 with a neutral-400 stroke (neutral-900 with neutral-600 in the dark theme). All setup presentation uses Tailwind utilities in ade/web/src/components/onboarding, with no custom setup stylesheet. Short Motion step transitions honor reduced motion. Provider choices remain visible and stable as their state changes.

Tokens

Use the Tailwind utility (bg-surface, text-ink-faint) inside the console; injected worker CSS uses var(--color-*). Public names are the ones in packages/console-ui/token-names.mjs; everything else below is console-only and may change.

Surface ramp (light → dark)

Token	Light	Dark	Use
bg	#f5f5f5	#0a0a0a	Application canvas, the deepest layer
sidebar	#f2f2f2	#0e0e0e	Navigation columns (PageSidebar)
panel	lab(98.26% 0 0)	#111111	Main columns (PageShell, PageMain)
panel-raised	#fafafa	#171717	Headers, cards, popovers, composer, tool cards
paper-2	#ededed	#171717	Legacy alias of panel-raised; do not add uses
surface	rgba(24,24,24,.055)	rgba(255,255,255,.055)	Inputs, controls, chips, secondary cards
surface-hover	rgba(24,24,24,.085)	rgba(255,255,255,.085)	Hover on rows, items, ghost controls
surface-selected	rgba(24,24,24,.12)	rgba(255,255,255,.12)	Selected row, card, tab, chip, segment
surface-active	rgba(24,24,24,.12)	rgba(255,255,255,.12)	Pressed / strong active
card-highlight	#dbdbdb63	#0d0d0e63	Borderless inset inside a card; never a state

The surface* fills are alpha, so one step reads the same over any base layer.

Ink, strokes, accent, status

Token	Light	Dark	Use
ink	#0a0a0a	#ededed	Primary text, primary buttons, wordmark
ink-faint	#6b6b6b	#a6a6a6	Secondary copy, captions, inactive navigation
ink-ghost	#909090	#6f6f6f	Placeholders, timestamps, line numbers
ink-disabled	#b5b5b5	#4d4d4d	Disabled labels (paired with opacity-40)
muted-foreground	#6b6b6b	#b8b8b8	Legacy alias of ink-faint (dark one step brighter)
trigger-running	#57534f	#a6a6a6	In-flight function description shimmer base
rule, rule-2, rule-strong	transparent	transparent	Legacy; border-rule* is an inert 1px
rule-focus	rgba(64,64,64,.6)	rgba(212,212,212,.7)	The focus stroke on inputs and controls
edge	#18181829	rgba(255,255,255,.07)	Panel frame, PageBody gap, selected rail
accent / accent-fg	#383838 / #f5f5f5	#dedede / #070909	Live state, focus ring, primary action
accent-hover	#262626	#f5f5f5	Hover on accent fills
accent-muted / accent-border	10% / 35% alpha	12% / 35% alpha	Accent tint / legacy accent stroke
alert / alert-muted	#ff0026 / 8%	#f05d68 / 12%	Errors, failed calls
warn / warn-muted	#a87a00 / 12%	#f5a524 / 12%	Warnings, pending approval
alert-strong / warn-strong	#c60021 / #7a5700	#ff4d63 / #d49b00	The same status as 11–12px text (AA); dots and badges keep the base tone
ok / ok-muted	#356f3d / 12%	#36c98f / 12%	Success, completed calls, diff additions
workdir / workdir-muted	#0ea5e9 / 12%	same / 14%	Console-only: the chat activity folder mark
ring	5% ink mix	same	Tailwind's default ring colour

Glyph tones

glyph-blue #2563eb, glyph-purple #7c3aed, glyph-teal #0d9488, glyph-green #15803d, glyph-amber #b7791f, glyph-rose #e11d48 (dark: #3b82f6 #8b5cf6 #14b8a6 #22c55e #eab308 #f43f5e). Identity tints for one 16px glyph beside a label — an agent profile in the conversation tree, a folder or scope mark in a worker's tree — applied through data-color on uiClasses.treeItemIcon. Each holds at least 3:1 against sidebar. A tone is never a fill, a border, text or a selection/status state; neutral means the glyph keeps ink-ghost.

Fonts — three roles

Token	Stack	Role
--font-sans	Inter, ui-sans-serif, system-ui	Human copy and controls (400/500/600 loaded)
--font-mono	Geist Mono, Chivo Mono, ui-monospace	Machine values in chrome: IDs, times, eyebrows, keys
--font-code	Monaco, SF Mono, Menlo, Consolas	Editor, terminal, pre, code — not the chrome mono
--font-geist-mono	Geist Mono, ui-monospace	Alias used by function-trigger chrome

Ligatures are off on every mono/code surface (liga clig calt dlig 0). Do not add a family.

Radii, shadows, motion, spacing

Token	Value
radius-xs … radius-md	6px
radius-lg / radius-xl	8px / 12px
radius-none / radius-full	0 / 9999px
shadow-raised (light)	0 1px 2px #1410081a, 0 4px 12px #1410081a
shadow-raised (dark)	0 1px 0 rgba(255,255,255,.025) inset, 0 8px 24px rgba(0,0,0,.18)
shadow-floating (light)	0 2px 4px #1410081a, 0 10px 24px #1410081a
shadow-floating (dark)	0 1px 0 rgba(255,255,255,.03) inset, 0 12px 32px rgba(0,0,0,.28)
shadow-lift	inset 1px highlight + inset 1px ring + 1px outer edge + two tight drops (composer)
shadow-keycap	lift upside down — lit edge at the bottom, drops upward (Kbd only)
motion-duration-instant/fast/control/panel	0 / 120 / 160 / 220 ms
motion-ease-standard	cubic-bezier(0.2, 0, 0, 1) — state changes
motion-ease-enter / ease-glide	cubic-bezier(0.16, 1, 0.3, 1) — mounting
motion-ease-exit	cubic-bezier(0.4, 0, 1, 1) — dismissal
spacing-gutter / section-x / section-y	24 / 36 / 80 px
spacing-sheet-max / content-max	1200 / 1216 px

Four shadows, each a complete theme-aware value; the --iii-ui-lift-* ingredients are console-only. Under prefers-reduced-motion the three non-zero durations become 0ms and every animation runs once at 0.01ms. Console-only transitions.dev scale: --duration-stagger 40, micro 80, quick 150, fast 250, medium 350, slow 400, very-slow 500 ms, --ease-smooth-out, --distance-*, --scale-*, --blur-* — used by dropdown, sheet and picker-page motion. Note --duration-fast (250ms) is not --motion-duration-fast (120ms).

Dark theme is the same token set flipped under html[data-theme="dark"]: a neutral gray ramp from black, white-alpha component fills, blue accent, and heavier shadows because there the shadow is the only depth cue. index.html picks the theme before paint from localStorage iii-theme, else the OS prefers-color-scheme; useTheme (use-theme.ts) then owns html[data-theme], color-scheme, the theme-color meta and the stored value. Once a user has chosen, the console does not follow later OS changes.

Typography

Two families plus the code font (above). The scale is whatever the shared components render:

Role	Size / weight	Where
Page title	14px / 500 sans, ink	PageHeader title; description 12px ink-ghost
Cell title	16px / 600 sans, -0.01em	EmptyState heading
Card / panel header	13px / 600 sans on surface, 40px tall	CardHeader, PanelHeader
Settings section title	14px / 600 desktop, 16px phone	SettingsSection
Body	13px sans (body element: 14px/20px)	list titles, tree rows (500), tabs (600), buttons
Description	12px ink-faint	list/settings descriptions, StatusPanel detail, tooltip
Eyebrow	11px / 500 mono, uppercase, 0.06em; lg 0.14em	Eyebrow, .iii-ui-eyebrow
Metadata	11px sans, tabular-nums	StatusBar, tree meta, field description, Kbd (mono)
Floor	11px	lint-worker-ui warns below it
Micro	10px mono	Trace timeline labels only — data visualisation, never chrome

Every number, timestamp and KPI sets tabular-nums. Case: copy keeps its authored case. The only sanctioned CSS case transform is the eyebrow (Eyebrow, eyebrowClassName, .iii-ui-eyebrow); no uppercase/lowercase/capitalize anywhere else, on any element.

Numbers

The single source of truth — other skills link here and never restate these.

Number	Value	Source
Body text	13px desktop; inputs 16px on phones	Input.tsx, ui-recipes.css
Page title / description	14px / 12px	PageChrome.tsx
Card header	13px / 600	.iii-ui-card__header
Metadata / eyebrow / floor	11px	Toolbar.tsx, Eyebrow.tsx, lint-worker-ui.mjs
Icon	16px (size-4, .iii-ui-icon)	ui-recipes.css, lint rule icon-size
Radius	6px	--radius-*
Desktop rows	tree row 28, status bar 28, toolbar 36, page header 44	ui-recipes.css, PageChrome.tsx
Desktop controls	icon button 30, button sm/md/lg 32/36/44, input 36	Button.tsx, Input.tsx
Narrow pane	tree rows 44, tree caret/action 40 (data-narrow)	.iii-ui-tree[data-narrow]
Narrow container	settings controls and actions 48 under 30rem	@container (max-width: 30rem)
Phone (< 640px) rows	list rows 48, segmented items 44, settings rows 56	ui-recipes.css
Phone icon actions	header close and gear 48, sheet close 48, switch hit 48	PageChrome.tsx, BottomSheet.tsx
List row	44px min everywhere, 48 on phones	.iii-ui-list-item
Chrome breakpoint	640px viewport (sm:), phone vs desktop presentation only	use-media-query.ts
Pane steps	@2xl 672px, @3xl 768px, @5xl 1024px container queries	PageShell is @container
Narrow-pane threshold	720px default (useContainerNarrow); chat pane uses 560	hooks.d.mts, ChatPanel.tsx
Settings row stacking	under 30rem (480px) container	.iii-ui-settings-row
Table text	14px, 13px at ≥ 40rem container; cells 12px, compact 8px	.iii-ui-table
Panel gutter	6px between floating workspace panels	workspace-panel-divider-*
Card padding	body 12px; EmptyState cell 20px; header 10px/12px	.iii-ui-card__body, Cell.tsx
Tooltip	bottom by default, offset 6px, 12px text	Tooltip.tsx

Shared components

Everything below is exported by @iii-dev/console-ui (component-names.mjs); props are the ones in index.d.ts. State is expressed with data-* attributes (data-selected, data-tone, data-narrow, data-density), never with extra classes.

Page chrome

Component	Anatomy / props	Do / Don't
PageShell	Pane root column, bg-panel, @container	Do make it every page's outermost element
PageHeader	icon 16px, title, description, actions, onClose	Do pass onRequestClose; no custom top bar
PageBody	Row under the header; side; 1px bg-edge gap	Don't add borders between sidebar and main
PageSidebar	bg-sidebar; collapsible, resizable, storageKey, narrowBelow	Do give it label; no own resize hook
PageMain	The primary column, bg-panel, scrolls inside	Do put toolbars and status bars inside it

PageSidebar also takes width/minWidth/maxWidth, narrow and narrowMode (inline full-width drill-in or drawer overlay).

Structure

Component	Anatomy / props	Do / Don't
Card / CardHeader / CardBody	panel-raised + edge + shadow-raised; selected, interactive	No dividers
CardHighlight	Borderless neutral inset (card-highlight)	Never for hover, selection or status
CollapsibleCard + Trigger + Content	Grid-track height motion; content stays mounted	No button inside the trigger
Panel / PanelHeader / PanelBody	Same recipe as Card without the shadow	Do use for in-flow regions
Toolbar	36px raised strip, end slot, role="toolbar"; as="form" for an address bar, orientation="vertical" for a rail	Do name it with aria-label
StatusBar	28px quiet strip, 11px faint tabular text, end slot	Counts and paths here, not the header

Lists and trees

Component	Anatomy / props	Do / Don't
List / ListGroup / ListGroupLabel	4px gap; arrows and Home/End walk items	Do group with a 12px/600 label
ListItem	44px button row: leading, label, description, trailing, selected; as="div" when the row holds its own buttons	Never accent on selection
uiClasses.tree*	28px rows, --iii-ui-tree-depth, treeItemIcon[data-color], caret, meta, actions wrapping every action	Do wrap the actions — a hidden one must never hold width. Phones: data-narrow; data-pointer="fine" drops a mouse-only action

Tables

Component	Anatomy / props	Do / Don't
TableViewport → TableFrame → Table	Scroll viewport (@container), frame, density comfortable/compact, inset inside a card	Wrap it
TableHeader / TableBody / TableFooter	Sections; rows separate with an edge hairline	Don't zebra-stripe
TableRow / TableHead / TableCell / TableCaption	interactive rows walk with arrows; selected	No vertical rules

Choice and input

Component	Anatomy / props	Do / Don't
Tabs + TabsList/TabsTrigger/TabsContent	Line variant, 40px, 2px ink underline, icon from value	Content navigation
SegmentedControl	variant tabs (tablist) / radio (preference), iconOnly	aria-label on radio
Select	options/groups, appearance, sheetTitle on phones	Short fixed lists
Selector	Searchable combobox; query, loading, error, onCreate; needs aria-label	Long or remote lists
Switch	36×20 desktop, 44×24 phone, 48px hit area	State only, never an action
Checkbox	18px box, label, indeterminate; accent when checked	Lists of options; a single on/off is a Switch
Input	36px desktop / 48px phone, surface fill, rule-focus on focus	Don't add a border
SearchField	Magnifier, clear button, Escape clears and stops; other props (data-*, aria-*, autoFocus) reach the input	Use it for filtering, not a bare Input
RawValueInput	Input that preserves raw values	Machine values
SettingsSection / SettingsList	title, description, action; the list frames rows	Compose forms from these
SettingsRow	label, description, meta, control, action, layout auto/inline/stacked	No hand-rolled label pairs
SettingsField	SettingsRow owning ids and ARIA via renderControl; controlSize, error	Every form control
SettingsDeck	Overview ↔ detail: open, overview, detail, title, onBack	Drill-in settings on narrow panes

Actions

Component	Anatomy / props	Do / Don't
Button	variant primary/ghost/pill/icon/terminal/wiggle; size sm 32 / md 36 / lg 44 / icon 30	One primary per view
IconButton	Button size icon + required label, tooltip (false hides), tooltipSide	Never icon-only without a label
Tooltip	label shorthand, or TooltipTrigger + TooltipContent (side, default bottom)	Don't tooltip a bare ✕
DropdownMenu + Trigger/Content/Group/Item/Label/Separator, CheckboxItem (toggle, onSelect + preventDefault keeps it open), RadioGroup/RadioItem (one choice), Sub/SubTrigger/SubContent (a setting row that pushes into a submenu)	Radix menu on panel-raised, shadow-floating; check in the left gutter, tree caret on a sub-trigger	Destructive last; no Menubar — one trigger per menu

Feedback

Component	Anatomy / props	Do / Don't
EmptyState	icon, title, description, one action (ghost sm); compact inside a card, actions[] for more	Write a sentence, not a shrug
Skeleton	surface block with skeleton-pulse	Match the final layout's shape
StatusPanel	variant info/success/warn/alert; icon, headline, detail on the tint; action slot, role passes through	Errors + retry; never raw text
Badge	Pill, variant default/ok/warn/alert/accent, 12px (16px phone)	One word or a count
Chip	24px tag, tone neutral/accent/success/warning/danger, selected	Not a button
StatusDot	6px dot, tone accent/alert/warn/ink, pulse (pulse-dot, the one glow)	Accent = running
LiveRegion	announcement { seq, text, urgency }	Announce async results once
Eyebrow	Mono caps label, as, size md/lg	Don't uppercase anything else
Breadcrumb	Mono path, items[{ label, onClick?, key? }] root → current; separator (/), emphasizeRoot; last item is aria-current="page", overflow scrolls	One per Toolbar; never repeat the path in a header above it
Kbd / KeyCombo	Key cap with shadow-keycap; binding (Mod+S) per platform	Shortcuts in prose
ErrorBoundary	Catches render errors of injected UI	Wrap independently failing regions

Overlays

Component	Anatomy / props	Do / Don't
Dialog + Trigger/Content/Title/Description/Close	Radix dialog on panel-raised, shadow-floating	Always a title
ConfirmDialog + useConfirm	title, description, details[], tone danger; cancel owns focus	Never window.confirm
BottomSheet + Content/Title/Description/Trigger/Close	Phone sheet, heading, in-sheet pages, safe area	Desktop: popover
ImageViewer / ImageThumbnailButton	Full-screen viewer with zoom/pan; thumbnail opens it	Any content image
AnnotationLayer / AnnotationList	Pin/rect/arrow annotations over an image	Screenshot markup

Code and terminal

Component	Anatomy / props	Do / Don't
CodeEditor	value, language, readOnly, fill, lineNumbers, wordWrap, selectionActions	fill in a pane
FileDiff	Diff of two FileDiffSides	Every file change
Markdown / MarkdownPreview	Rendered markdown (children / markdown)	No dangerouslySetInnerHTML
CodeHighlight / JsonHighlight	Static highlighted block, wrap	Read-only snippets
TerminalCommandLine	Prompt + command, optional copy, chips	Keep it in --font-code
TerminalStream / AnsiText	Streamed text, tone out/err, ansi, clampLines	Clamp long output

Activity and identity

Component	Anatomy / props	Do / Don't
MetaRow	Label/value strip a function-call card opens with; items[] values in mono, tone per item	Call metadata
ActionLine	One reported action: icon 16px in tone accent/warn/ink, body in ink	→ url, ƒ function
ModelPicker	value, options, thinkingLevel, reasoning effort, provider setup	No second model menu
DirectoryPicker	Working-directory picker with browse and validation	Wherever a page needs a folder
Wordmark	appearance default/inset/loading, tone auto/ink/inverse	Never coloured
WorkerConfigurationDialog	Opens a worker's configuration by configurationId	Prefer PageHeader's gear

Hooks and helpers

Export	What it does
useTheme()	Public: 'light' | 'dark'; the console's use-theme.ts also returns a setter
useConfirm()	{ confirm, dialog } — render dialog once, await confirm(options)
useContainerNarrow({ below })	{ ref, narrow } from a ResizeObserver on the pane (default 720)
usePaneState(key, initial)	useState mirrored to localStorage; key it by paneId
useCopyFlash(text, ms)	{ state: idle|copied|failed, copy }
useWorkerLive({ iii, triggers, fetch, handlerId })	Fetch once, refetch on trigger events ('type' or { type, config } for a stream), poll only while not live
useDebounce(value, ms)	The value once it stops changing for ms (remote queries)
useSplitDrag({ horizontal, begin, move, step })	Pointer + arrow-key handlers for a role="separator"
formatRelative, formatDuration, formatBytes	42s, 2m 05s, 1.0 MiB — binary units with a space
errorCode, errorMessage, copyText	Readable errors from a rejected iii.trigger; clipboard with fallback
unwrapEnvelope(value)	{ content, details } harness envelope → details; flat input passes through

The six hooks are @iii-dev/console-ui/hooks; the formatters are @iii-dev/console-ui/format — both bundle into a worker page.

UX patterns

Pattern	Do this
Loading	Skeleton in the shape of the final content, in place; never a spinner over a blank pane
Empty	EmptyState with a title, one sentence and at most one action
Error	StatusPanel variant="alert" + errorMessage(err) + a retry Button; never raw error text
Selection	data-selected / aria-selected / aria-current → surface-selected + ink; never accent
Toolbars	Toolbar above the content, StatusBar below; both inside PageMain
Paths	Breadcrumb inside the Toolbar (back IconButton before it, actions in end); ancestors navigate, the current segment is plain ink
Search / filter	SearchField (Escape clears); debounce remote queries in the page
Confirmation	useConfirm / ConfirmDialog; tone="danger" for destructive; never window.confirm
Eyebrows	Eyebrow for section labels and key/value keys; no other uppercase
Icons	lucide-react through the import map, 16px; never inline or text glyphs (✓, ×)
Narrow panes	useContainerNarrow / PageSidebar narrowBelow; data-narrow on trees; never viewport queries
Live data	useWorkerLive with the worker's trigger types; show live quietly, never a banner
Formatting	The format subpath; bytes binary with a space (3.2 MiB), durations 1.4s / 2m 05s
Pane state	usePaneState keyed by PageRenderProps.paneId; two panes of one page stay separate
Keyboard	PageRenderProps.commands.register([...]) in an effect; no document listeners; no bare keys
Motion	uiClasses.motionControl/motionPanel/motionOverlay, uiClasses.spin (1s), uiClasses.pulse
Identity	glyph-* on one 16px glyph via treeItemIcon[data-color]; status stays on StatusDot/Chip
Mono vs sans	Values in font-mono, labels in sans; never a whole panel in mono
Function-call cards	MetaRow first, ActionLine per reported action, body in fcall-chrome (console)
Theme	Read useTheme(); never branch on prefers-color-scheme yourself

Do / Don't

Do

• Build every page from PageShell → PageHeader → PageBody → (PageSidebar) + PageMain.
• Step the background one level to make a region; reach for edge only on the panel frame, the PageBody gap and a selected rail.
• Use Geist for copy and controls (Inter fallback), Geist Mono for machine values, the code font for code.
• Keep every number tabular-nums; keep authored case; Eyebrow is the one uppercase.
• Ration the accent to focus, live/running state, primary actions and semantic data.
• Lay panes out with @container and @2xl: / @3xl: / @5xl:; reserve the 640px viewport breakpoint for console chrome (phone sheet vs popover, 16px inputs, 48px touch targets).
• Use the four shadows (raised, floating, lift, keycap) and the motion tokens; honour reduced motion by default (the tokens already do).
• Use Lucide icons at 16px and give every icon-only control a label.

Don't

• Don't draw dividers, outlines or accent selection strokes; don't add border-rule*.
• Don't invent radii, shadows, durations, font sizes below 11px, or a fourth font.
• Don't put a solid status colour behind text; tint with -muted and colour the text/dot.
• Don't uppercase, lowercase or capitalise copy outside Eyebrow.
• Don't use viewport media queries for pane layout, window.confirm, inline SVG, document key listeners or bare-key shortcuts.
• Don't use gradients, except fcall-chrome (function-call cards) and thinking-shimmer (streaming text), and no glow except pulse-dot.
• Don't set a whole panel in mono, or technical values in sans.
• Don't reach for a Tailwind utility to override a property a recipe already sets: ui-recipes.css is imported unlayered, so a normal utility in @layer utilities loses to it at any specificity and silently does nothing. Only an !important utility would win, and that is not the answer — put the rule in the recipe, keyed by a data attribute.