/** One section's share of the leg's system prompt, as the `context_usage` frame reports it. */
export interface ContextUsageSection {
    /** The pack section id — the same wordlist `prompt.assembled`'s `sections[].id` uses. */
    id: string;
    /** The section's ESTIMATED token weight (see {@link contextUsageSections} for what that promises). */
    tokens: number;
    /** The section's band (`role`, `constitution`, `core-behavior`, …), so a view can group without knowing
     *  every id. Absent only if the manifest entry carried no band. */
    kind?: string;
}
/**
 * Project the manifest's compiled sections onto the frame's occupancy view.
 * @contract context_usage.sections — `sections[]` is the leg's PREPARE-TIME system-prompt composition,
 * one entry per rendered pack section, `tokens` ESTIMATED from rendered characters at the engine's
 * chars→tokens coefficient. A different measurement from `usedTokens`, the engine's trigger input over the
 * whole conversation. The two coordinates MUST NOT be mixed: do not subtract `Σ sections[].tokens` from
 * `usedTokens`, do not compare a section to `compactAtTokens`, and do not read a change across frames as
 * growth — the value is frozen at prepare and re-reported verbatim at every boundary of the leg. It
 * answers "what is my system prompt made of, and which part is big". Absent when the leg assembled no
 * section IR (a provider that replaced the prompt wholesale ships one opaque block).
 */
export declare function contextUsageSections(sections: ReadonlyArray<{
    id: string;
    band?: string;
    chars: number;
}> | undefined): ContextUsageSection[] | undefined;