/**
 * A short, stable fingerprint of a file body.
 *
 * Used to answer one question at mutation admission: is the file still what
 * the agent read? An `edit` or full replacement is based on a remembered
 * body, and before the write begins that body can move — a person editing in
 * an editor, another process, a second agent's turn. The in-process mutation
 * lock serializes this runtime's own writers and is blind to every one of
 * those.
 *
 * Without this the drift is not merely undetected, it is actively
 * misreported: an `old_string` that no longer matches comes back as "not
 * found in file — make sure the string matches exactly", which tells the
 * agent its input was wrong when the file changed underneath it. The agent
 * then retries the same edit against the same moved file.
 *
 * Truncated deliberately. This distinguishes two bodies; it is not a
 * security boundary, and a full digest per read costs bytes in a structure
 * that lives for the whole turn.
 */
export declare function fingerprintContent(content: string): string;
/** What a mutation tool tells the agent when admission sees a moved file. */
export declare function staleFileError(path: string, operation?: 'edit' | 'write'): string;
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