/**
 * Beam Shield — Wall 4: Output Filter
 * Detects PII, credentials, and sensitive data in agent responses before sending.
 */
export declare const PII_PATTERNS: Record<string, RegExp>;
export interface PIIMatch {
    type: string;
    value: string;
    index: number;
}
export declare function detectPII(text: string): {
    found: boolean;
    matches: PIIMatch[];
};
export declare function detectCredentials(text: string): {
    found: boolean;
    types: string[];
};
export declare function redactPII(text: string): string;
export type RiskLevel = 'low' | 'medium' | 'high' | 'critical';
export interface OutputRiskAssessment {
    riskLevel: RiskLevel;
    reasons: string[];
    shouldBlock: boolean;
    piiCount: number;
    credentialCount: number;
}
export declare function assessOutputRisk(text: string, recipientTrust: number): OutputRiskAssessment;
export interface OutputFilterContext {
    recipientBeamId: string;
    recipientTrust: number;
    recipientTier: string;
}
export interface OutputFilterResult {
    allowed: boolean;
    original: string;
    filtered: string;
    redactedItems: string[];
    riskLevel: RiskLevel;
    reasons: string[];
}
export declare function filterOutput(response: string, context: OutputFilterContext): OutputFilterResult;