/**
 * Validation for Skills following the Agent Skills specification.
 * @see https://agentskills.io/specification
 *
 * This module uses plain validation functions instead of Zod to avoid
 * version compatibility issues between Zod 3 and Zod 4.
 */
/**
 * Recommended limits from the Agent Skills spec
 */
export declare const SKILL_LIMITS: {
    /** Recommended max tokens for instructions */
    readonly MAX_INSTRUCTION_TOKENS: 5000;
    /** Recommended max lines for SKILL.md */
    readonly MAX_INSTRUCTION_LINES: 500;
    /** Max characters for name field */
    readonly MAX_NAME_LENGTH: 64;
    /** Max characters for description field */
    readonly MAX_DESCRIPTION_LENGTH: 1024;
    /** Max characters for compatibility field */
    readonly MAX_COMPATIBILITY_LENGTH: 500;
};
/**
 * Skill metadata input type (what users provide)
 */
export interface SkillMetadataInput {
    /** Skill name (1-64 chars, lowercase letters/numbers/hyphens only, must match directory name) */
    name: string;
    /** Description of what the skill does and when to use it (1-1024 characters) */
    description: string;
    /** License for the skill (e.g., "Apache-2.0", "MIT") */
    license?: string;
    /** Environment requirements or compatibility notes (string or object for flexibility) */
    compatibility?: unknown;
    /** Arbitrary key-value metadata - values can be strings, arrays, objects, etc. */
    metadata?: Record<string, unknown>;
}
/**
 * Skill metadata output type (after validation)
 */
export type SkillMetadataOutput = SkillMetadataInput;
/**
 * Validation result with warnings
 */
export interface SkillValidationResult {
    valid: boolean;
    errors: string[];
    warnings: string[];
}
/**
 * Validate skill metadata with optional content warnings.
 *
 * @param metadata - The skill metadata to validate
 * @param dirName - The directory name (must match skill name)
 * @param instructions - Optional instructions content for token/line warnings
 * @returns Validation result with errors and warnings
 *
 * @example
 * ```typescript
 * const result = validateSkillMetadata(
 *   { name: 'my-skill', description: 'A helpful skill' },
 *   'my-skill',
 *   '# Instructions\n...'
 * );
 *
 * if (!result.valid) {
 *   console.error('Validation errors:', result.errors);
 * }
 * if (result.warnings.length > 0) {
 *   console.warn('Warnings:', result.warnings);
 * }
 * ```
 */
export declare function validateSkillMetadata(metadata: unknown, dirName?: string, instructions?: string): SkillValidationResult;
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