/**
 * Response size budget for tool results sent to the client.
 *
 * A single tool call can return megabytes (10,000 table rows, a full bill
 * text), which floods the model's context or gets cut off mid-JSON by the
 * client. Results over the budget are shortened while staying valid JSON:
 *
 * 1. The largest arrays (table rows, list items) are cut to the longest
 *    prefix that fits.
 * 2. If that isn't enough, the longest strings are clipped.
 * 3. A `truncatedToFit` marker says what was shortened, the summary notes
 *    it, and a columnar `data` object gets `truncated: true`.
 *
 * Non-JSON text is clipped with a note. code_mode reads raw tool output
 * through the registry, so it still sees everything.
 *
 * MAX_RESPONSE_BYTES sets the budget (UTF-8 bytes); 0 turns it off.
 */
export declare const DEFAULT_MAX_RESPONSE_BYTES = 150000;
/** Budget from MAX_RESPONSE_BYTES: a positive integer, 0 for none, else the default. */
export declare function maxResponseBytes(env?: NodeJS.ProcessEnv): number;
/** Shorten `text` to at most `maxBytes` (see the module comment). Unchanged when it already fits. */
export declare function fitResponse(text: string, maxBytes: number): string;
/** A tool result with the budget applied to its text. Non-text results pass through. */
export declare function budgetResult(result: unknown, maxBytes: number): unknown;
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