/**
 * Pure utility helpers for ToolCapture.
 *
 * Extracted from tool-capture.ts to satisfy the ≤500 LOC gate (GA-4).
 * All functions are stateless and do not reference `this`.
 *
 * @module session-tracker/capture/tool-capture-helpers
 */
/**
 * Extracts the first markdown header line (`# ...`) from tool output.
 *
 * @param output - The raw tool output.
 * @returns The first header line, or `undefined` if none found.
 */
export declare function extractFirstHeader(output: unknown, asString: (v: unknown) => string | undefined): string | undefined;
/**
 * Extracts a task_id from the output string.
 *
 * Recognizes two formats:
 * - `task_id: ses_abc123` (the canonical format from Plan 01 task tool output)
 * - A standalone session ID starting with `ses_` that appears in the output
 *
 * @param output - The raw tool output.
 * @returns The extracted task/session ID, or `null` if none found.
 */
export declare function extractTaskId(output: unknown, asString: (v: unknown) => string | undefined): string | null;
/**
 * Extracts the completed child-session result from a task tool output.
 *
 * OpenCode only emits hook events for the parent session, so child-session
 * content is captured from the parent's completed `task` tool result.
 * Outputs that only contain the task identifier are dispatch-only signals
 * and intentionally return `undefined`.
 *
 * @param output - Raw task tool output.
 * @param taskID - Child task/session identifier to remove from the payload.
 * @returns Child result content, or `undefined` when no result is present.
 */
export declare function extractTaskResult(output: unknown, taskID: string, asString: (v: unknown) => string | undefined): string | undefined;
/**
 * Safely converts unknown output to a string.
 *
 * @param value - The value to convert.
 * @returns The string representation, or `undefined` if not representable.
 */
export declare function asString(value: unknown): string | undefined;
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