/**
 * Per-model-family prompt overlays.
 *
 * A small addendum appended to the assembled system prompt when a non-Claude
 * engine is active. Claude is the baseline so it gets no overlay. GPT-family
 * models benefit from an explicit autonomy/persistence nudge and parallel-tool
 * encouragement. Gemini benefits from concise tool-call discipline.
 *
 * Each overlay is ≤8 lines. They are selected by the active model id at the
 * point in agent-chat-plugin.ts where both the assembled prompt and the
 * resolved model id are known.
 */
/**
 * Return the model-family overlay string for the given model id, or an empty
 * string for Claude (baseline — no overlay needed).
 */
export declare function getModelFamilyOverlay(modelId: string): string;
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