export declare function isCostApprovalGatedTool(toolName: string, options?: {
    knownCreativeToolNames?: ReadonlySet<string>;
}): boolean;
export declare const COST_APPROVAL_OVERRIDE_ALLOWLIST: ReadonlySet<string>;
export declare function sanitizeCostApprovalOverride(key: string, value: unknown): unknown;
export declare function applyCostApprovalOverridesToToolArguments(argumentsJson: string, overrides: Record<string, unknown> | undefined): {
    result: string;
    rejected: string[];
};
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