/** Get the artifact directory for a session, creating it if needed */
export declare function getArtifactDir(sessionId: string): string;
/** Store an artifact on disk. Returns the file path. */
export declare function storeArtifact(sessionId: string, filename: string, content: string | Buffer): string;
/** Read an artifact from disk */
export declare function readArtifact(sessionId: string, filename: string): Buffer | null;
/** List artifact files for a session */
export declare function listArtifactFiles(sessionId: string): string[];
/** Remove all artifacts for a session */
export declare function cleanupArtifacts(sessionId: string): void;
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