/**
 * Boundary parse guard for `write_file`'s tool-result metadata.
 *
 * `StepResult.metadata` is an opaque `Record<string, unknown>` at the core
 * level; the TUI must parse it before use (constitution: parse, don't cast).
 * The `FileWriteMetadata` type is owned by the producer (`src/tools/core.ts`)
 * and imported here type-only — Adapter→Infrastructure is the allowed direction
 * and the import is erased at runtime.
 */
import type { FileWriteMetadata } from '../../../../tools/core.js';
export declare function isFileWriteMetadata(u: unknown): u is FileWriteMetadata;