/**
 * Redact secret-like substrings and strip managed-context markers so handoffs
 * never persist credentials or poison copilot-instructions sentinels.
 */
/** Replace credential-like tokens with [REDACTED]. */
export declare function redactSecrets(value: string): string;
/**
 * Safe for injection into managed instructions: redact secrets, drop marker
 * sentinels, collapse newlines.
 */
export declare function sanitizeForInstructions(value: string): string;
/** Redact + strip markers for stored handoff text fields. */
export declare function sanitizeHandoffText(value: string): string;