/**
 * Skill Engine — Machine-Readable Skill Discovery & Validation
 *
 * Parses YAML frontmatter from .claude/commands/*.md skill files,
 * providing programmatic discovery, dependency validation, and
 * tier/category filtering.
 *
 * Uses regex-based parsing (no js-yaml dependency).
 */
export type SkillTier = 'any' | '1' | '2' | '3';
export type SkillCategory = 'core-workflow' | 'planning' | 'memory' | 'verification' | 'communication' | 'analysis' | 'system' | 'documentation' | 'infrastructure';
export interface SkillRequirements {
    env: string[];
    integrations: string[];
}
export interface SkillManifest {
    name: string;
    description: string;
    tier: SkillTier;
    category: SkillCategory;
    autoInvoked: boolean | 'cron';
    dependencies: string[];
    relatedSkills: string[];
    requirements: SkillRequirements;
    /** Original file path (set by loadSkills) */
    filePath?: string;
}
export interface ValidationResult {
    valid: boolean;
    errors: string[];
}
/**
 * Parse a SkillManifest from raw file content.
 * Returns null if no valid frontmatter is found.
 */
export declare function parseSkillManifest(content: string): SkillManifest | null;
/**
 * Load all skill manifests from a directory of .md files.
 */
export declare function loadSkills(skillsDir: string): Promise<SkillManifest[]>;
/**
 * Filter skills by tier. Returns skills available at the given tier.
 * 'any' tier skills are always included. Numeric tiers include skills
 * at that tier or lower.
 */
export declare function getSkillsByTier(skills: SkillManifest[], tier: SkillTier): SkillManifest[];
/**
 * Validate that all skill dependencies and relatedSkills reference
 * existing skills in the manifest set.
 */
export declare function validateDependencies(skills: SkillManifest[]): ValidationResult;
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