export type MermaidBlock = {
    code: string;
    blockIndex: number;
    startLine: number;
    endLine: number;
};
export type MermaidContextSlice = {
    beforeLines: string[];
    afterLines: string[];
};
/**
 * line-based scan for mermaid fenced blocks.
 * avoids global regex because agent output often has nested or malformed fences.
 */
export declare function extractMermaidBlocks(text: string, maxBlocks?: number): MermaidBlock[];
/** grab surrounding context lines, stripping trailing blanks */
export declare function captureContextSlice(text: string, block: MermaidBlock, radius?: number): MermaidContextSlice;
/**
 * handle pi's message content format — string or ContentPart[].
 * ContentPart arrays contain objects with a `text` field for text parts.
 */
export declare function extractText(content: unknown): string;
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