/**
 * Tool output serialization utilities.
 * Extracted from Agent.executeTools to allow reuse and consistent output handling.
 */
export interface ToolOutputSerializerOptions {
    perIterationOutputCapBytes?: number | undefined;
    estimator?: ((text: string) => number) | undefined;
}
export interface ToolOutputSerializeContext {
    toolName?: string | undefined;
    input?: unknown;
    /**
     * Optional reference to the Tool object. When present and the tool defines
     * a `serialize()` method, the serializer delegates to it instead of the
     * central `renderToolObject()` switch (P3 #21).
     */
    tool?: {
        serialize?: (output: unknown, input: unknown) => string;
    } | undefined;
}
export declare function createToolOutputSerializer(opts?: ToolOutputSerializerOptions): {
    serialize: (value: unknown, context?: ToolOutputSerializeContext) => string;
    enforceCap: (text: string, remainingBudget: number) => {
        text: string;
        newBudget: number;
    };
    capBytes: number;
};
/**
 * Render a tool result body for inclusion in the `tool.executed` event.
 * Tool outputs can be large (file dumps, command output); UIs only want a
 * preview line, so cap at ~400 chars with an ellipsis marker.
 */
export declare function truncateForEvent(content: string, max?: number): string;
export declare function sizeSignals(toolName: string | undefined, content: string): {
    outputBytes: number;
    outputTokens: number;
    outputLines: number | undefined;
};
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