Function formatContextUsage

packages/acp-adapter/src/session.ts:1489–1492

(contextUsage: number)

// briefly exceed 1.0 when a turn overflows the budget; we still surface
// that as ">100%" rather than collapsing back into 0..1.
function formatContextUsage(contextUsage: number): string {
  if (!Number.isFinite(contextUsage) || contextUsage < 0) return '';
  return ` (${(contextUsage * 100).toFixed(1)}%)`;
}

/**
 * Inspect the leading `ContentBlock` of an ACP prompt for a