import type { Tool, ToolCall } from '../../../types/tools.js';
import type { ToolRuntimeContext } from '../context.js';
import type { PhaseResult, ToolExecutionRecord } from '../types.js';
/**
 * budget, Budget enforcement phase for the tool execution pipeline.
 *
 * This phase is inserted at two points:
 *  - "entry": just before execute (checks elapsed wall-clock time).
 *  - "exit": just after mapOutput (checks token and cost budgets).
 *
 * When a hard budget is exceeded the phase returns `abort: true` with a
 * typed `budgetExceedReason` so the executor can surface a diagnostic
 * event before terminating the pipeline.
 *
 * All budget fields are optional in ToolRuntimeContext.budget, an absent
 * field means "unlimited" and the corresponding check is skipped.
 */
/** The point in the pipeline at which the budget check fires. */
export type BudgetCheckPoint = 'entry' | 'exit';
export declare function budgetPhase(_call: ToolCall, _tool: Tool, context: ToolRuntimeContext, record: ToolExecutionRecord, checkpoint: BudgetCheckPoint, defaultBudget?: {
    maxMs?: number | undefined;
    maxTokens?: number | undefined;
    maxCostUsd?: number | undefined;
} | undefined): Promise<PhaseResult>;
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