Function usable

packages/opencode/src/session/overflow.ts:10–20

(input: { cfg: ConfigV1.Info; model: Provider.Model; outputTokenMax?: number })

const COMPACTION_BUFFER = 20_000

export function usable(input: { cfg: ConfigV1.Info; model: Provider.Model; outputTokenMax?: number }) {
  const context = input.model.limit.context
  if (context === 0) return 0

  const reserved =
    input.cfg.compaction?.reserved ??
    Math.min(COMPACTION_BUFFER, ProviderTransform.maxOutputTokens(input.model, input.outputTokenMax))
  return input.model.limit.input
    ? Math.max(0, input.model.limit.input - reserved)
    : Math.max(0, context - ProviderTransform.maxOutputTokens(input.model, input.outputTokenMax))
}

export function isOverflow(input: {
  cfg: ConfigV1.Info