/**
 * Flow prompt construction for the before_agent_start handler.
 *
 * Extracted from index.ts for single-responsibility and testability.
 */
export interface BeforeAgentStartEvent {
    prompt: string;
    systemPrompt: string;
}
export declare function computeActiveTools(optimize: boolean, traceEnabled?: boolean, batchReadEnabled?: boolean): string[];
/**
 * Build the before_agent_start system prompt augmentation.
 *
 * Adds web steering (when tool optimize is off) and the flow transition
 * guide with guard info. The steering hint is NOT included here — it
 * is injected dynamically by the context hook in index.ts.
 *
 * Returns the augmented systemPrompt, or undefined if the child flow
 * should skip this handler.
 */
export declare function buildBeforeAgentStartPrompt(event: BeforeAgentStartEvent, toolOptimize: boolean): string | undefined;
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