/**
 * Leaper Agent – Skill Guard (skills/skill-guard.ts)
 *
 * Security scanner for skill files, translating Python tools/skills_guard.py.
 * Scans skill source code for known threat patterns (exfiltration, injection,
 * destructive commands, persistence, obfuscation, and network abuse) before
 * installing or executing community-sourced skills.
 */
export type Severity = 'critical' | 'high' | 'medium' | 'low';
export type Category = 'exfiltration' | 'injection' | 'destructive' | 'persistence' | 'network' | 'obfuscation';
export type TrustLevel = 'builtin' | 'trusted' | 'community' | 'agent-created';
export type Verdict = 'safe' | 'caution' | 'dangerous';
export type InstallDecision = 'allow' | 'block' | 'ask';
export interface Finding {
    patternId: string;
    severity: Severity;
    category: Category;
    file: string;
    line: number;
    match: string;
    description: string;
}
export interface ScanResult {
    skillName: string;
    source: string;
    trustLevel: TrustLevel;
    verdict: Verdict;
    findings: Finding[];
    scannedAt: string;
    summary: string;
}
export declare const TRUSTED_REPOS: ReadonlySet<string>;
/** SHA-256 hex digest of arbitrary content. */
export declare function contentHash(content: string): string;
/** Determine TrustLevel from a source string. */
export declare function determineTrustLevel(source: string): TrustLevel;
/** Derive verdict from a set of findings. */
export declare function determineVerdict(findings: Finding[]): Verdict;
/**
 * Determine whether a skill install should proceed based on its scan result.
 * Returns [decision, reason].
 */
export declare function shouldAllowInstall(result: ScanResult): [InstallDecision, string];
/**
 * Scan the text content of a single file for threat patterns.
 * Returns an array of findings (may be empty).
 */
export declare function scanFileContent(content: string, filename: string): Finding[];
/**
 * Scan a skill directory.  Reads SKILL.md and all text files recursively.
 *
 * @param skillPath  Absolute path to the skill directory.
 * @param source     Origin tag (e.g. 'builtin', 'openai/skills', 'agent-created').
 */
export declare function scanSkill(skillPath: string, source?: string): Promise<ScanResult>;
/**
 * Format a ScanResult as a human-readable multi-line string.
 */
export declare function formatScanReport(result: ScanResult): string;
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