/**
 * Assemble the final compaction prompt from layered sources.
 *
 * Resolution order:
 *   base = agentPrompt ?? DEFAULT_COMPACTION_PROMPT
 *   final = base + skillDirectives + previousSummary + focus
 *
 * `previousSummary` is the prior successful summary on a re-compaction; it is
 * reproduced verbatim so the model can merge it forward rather than answer
 * with a delta. Omit it on a first compaction.
 * @docLink packages/runner/dev-guide#compaction
 */
export declare function buildCompactionPrompt(opts: {
    agentPrompt?: string;
    skillDirectives?: string[];
    mcpDirectives?: string[];
    focus?: string;
    previousSummary?: string;
}): string;
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