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A 1px hairline // divider sits between every pair so the boundary reads even when two // tones land close together. Pure CSS, built from color-mix() against // --foreground and --background, never a hex literal and never --ns-accent // (accent is reserved for interaction, not decoration). // // Layout is plain flexbox: each segment's flex-basis is its share of // max(capacity, used) as a percentage, with a min-width floor on any segment // that has real tokens but would round below a legible sliver. The floor is // enforced by the browser's own flex-shrink algorithm (larger segments give // up the room), not by a hand-rolled pixel solver — a segment with tokens // never disappears, one with none never fakes a sliver it didn't earn. // // Approaching capacity is signalled through form: the wrapper gains a // pulsing inset ring, the readout goes bold and grows a triangle glyph, and // the free segment (if any width remains) grows a hazard hatch — never a red // fill, this palette doesn't have one. Compaction is just a prop change: // react re-renders new percentages and the segments ease into them on a // shared transition, so the resettle itself carries the news. // // All the numbers are real DOM text (a

readout plus a legend list), so // assistive tech gets the actual figures regardless of what the bar looks // like; the bar itself is aria-hidden as a redundant visual. The readout is // a polite live region since it changes asynchronously as tokens accrue. // prefers-reduced-motion drops the transition, the breathing, and the // hazard pulse — every state stays fully legible, just static. export interface BallastContextProps { /** total size of the context window, in tokens */ capacity: number; /** tokens spent on the system prompt */ system: number; /** tokens spent on tool/function definitions and results */ tools: number; /** tokens spent on prior conversation turns */ history: number; /** tokens spent on the turn currently being read or generated */ turn: number; /** * fraction of capacity (0-1) below which the free segment is flagged as * low headroom. default 0.08 (8%) */ lowFreeThreshold?: number; /** accessible name for the meter. default "Context window budget" */ ariaLabel?: string; /** extra classes merged onto the rendered root element */ className?: string; } const ROLES = [ { role: "system", label: "System" }, { role: "tools", label: "Tools" }, { role: "history", label: "History" }, { role: "turn", label: "Turn" }, { role: "free", label: "Free" }, ] as const; function formatTokens(n: number): string { return Math.round(Math.max(0, n)).toLocaleString("en-US"); } function formatPct(tokens: number, denom: number): string { if (tokens <= 0 || denom <= 0) return "0%"; const p = (tokens / denom) * 100; if (p < 1) return "<1%"; return `${Math.round(p)}%`; } export function BallastContext({ capacity, system, tools, history, turn, lowFreeThreshold = 0.08, ariaLabel = "Context window budget", className = "", }: BallastContextProps) { const safeSystem = Math.max(0, system); const safeTools = Math.max(0, tools); const safeHistory = Math.max(0, history); const safeTurn = Math.max(0, turn); const safeCapacity = Math.max(0, capacity); const used = safeSystem + safeTools + safeHistory + safeTurn; const overBudget = safeCapacity > 0 && used > safeCapacity; const free = Math.max(0, safeCapacity - used); // denominator the bar fills to 100% against: capacity normally, or the // used total itself once over budget, so the four segments still sum to // a full bar instead of visually shrinking below their real weight const denom = Math.max(safeCapacity, used, 1); const freeFraction = safeCapacity > 0 ? free / safeCapacity : 0; const warn = safeCapacity > 0 && (overBudget || freeFraction <= lowFreeThreshold); const tokensByRole: Record<(typeof ROLES)[number]["role"], number> = { system: safeSystem, tools: safeTools, history: safeHistory, turn: safeTurn, free, }; const pct = safeCapacity > 0 ? Math.round((used / safeCapacity) * 100) : 0; const statusSuffix = overBudget ? " · over budget" : warn ? " · low headroom" : ""; return (

{ROLES.map(({ role }) => { const t = tokensByRole[role]; return (

0 ? "3px" : "0px", }} /> ); })}

{warn ? ( ) : null} {formatTokens(used)} / {formatTokens(safeCapacity)} tokens · {pct}%{statusSuffix}

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