/**
 * Sentinel returned when an untrusted tool-result property cannot be
 * established as an own data property without invoking a property accessor.
 */
export declare const UNREADABLE_TOOL_RESULT_PROPERTY: unique symbol;
/**
 * Read an own data property without invoking an accessor.
 *
 * Missing properties return `undefined`. Accessor-backed properties and
 * descriptor failures return {@link UNREADABLE_TOOL_RESULT_PROPERTY}, so
 * security-sensitive callers can distinguish absence from an unsafe value.
 */
export declare function readToolResultOwnDataProperty(value: unknown, key: PropertyKey): unknown | typeof UNREADABLE_TOOL_RESULT_PROPERTY;
/** Check whether tool execution error marker is present. */
export declare function hasToolExecutionErrorMarker(value: unknown): boolean;
/** Check whether a tool result contains a complete deferred OAuth action. */
export declare function isIntegrationAuthenticationActionResult(value: unknown): boolean;
/** Return the displayable error for a failed tool result. */
export declare function getToolResultError(result: unknown): string | undefined;
/** Result returned from is errored tool execution. */
export declare function isErroredToolExecutionResult(result: unknown): boolean;
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