/** True when a JSON Schema node describes an object (explicit `type` or `properties`). */
export declare function isJsonSchemaObjectNode(schema: Record<string, unknown>): boolean;
/**
 * Flatten a provider-emitted tool ROOT whose top level is a `oneOf`/`anyOf`/`allOf`
 * combinator into one `type: "object"` schema: merge object-branch properties,
 * derive the discriminant (`action`) enum, keep the common required set, and demote
 * leftover combinators plus per-branch guidance into the description. Nested
 * combinators (inside individual properties) are left untouched.
 *
 * Idempotent: a root that already lacks top-level combinators is returned unchanged.
 */
export declare function flattenToolRootCombinators(schema: Record<string, unknown>): Record<string, unknown>;