export interface EscalateResult {
    __escalate: true;
    reason: string;
}
export declare function isEscalateResult(result: unknown): result is EscalateResult;
export interface RecoverResult {
    __recover: true;
    reason?: string;
}
export declare function isRecoverResult(result: unknown): result is RecoverResult;
/** Standard tool-result shape when `ctx.tool` fails in a model-initiated call. */
export declare function toolErrorResult(error: unknown): {
    error: true;
    message: string;
};
export interface ToolDeniedResult {
    __denied: true;
    toolName: string;
    deniedBy?: string;
    message: string;
}
/**
 * What the model sees when a human declines a `needsApproval` tool it asked to run.
 *
 * A result rather than an error, so the agent can tell the user the request was declined
 * instead of the turn dying. `__denied` (not `error: true`) keeps it distinguishable from a
 * genuine failure — nothing malfunctioned.
 */
export declare function toolDeniedResult(toolName: string, deniedBy?: string, reason?: string): ToolDeniedResult;