/**
 * Unified Skill Factory
 *
 * Function skill (one skill = one tool, flat):
 *
 *   import { skill } from '@zibby/skills';
 *
 *   export const add = skill('add', {
 *     description: 'Add two numbers',
 *     input: { a: 'number', b: 'number' },
 *     handler: async ({ a, b }) => ({ result: a + b })
 *   });
 *
 * MCP skill:
 *
 *   import { skill } from '@zibby/skills';
 *
 *   export const linear = skill('linear', {
 *     resolve() {
 *       if (!process.env.LINEAR_API_KEY) return null;
 *       return { command: 'npx', args: ['-y', '@linear/mcp-server'],
 *                env: { LINEAR_API_KEY: process.env.LINEAR_API_KEY } };
 *     }
 *   });
 */
/**
 * Create and register a skill.
 *
 * Function skill:  skill(id, { description, input, handler })
 * MCP skill:       skill(id, { resolve(), serverName?, ... })
 *
 * @param {string} id — Unique skill identifier
 * @param {SkillConfig} config — Skill definition
 * @returns {Skill} A registered skill object
 */
export declare function skill(id: any, config: any): any;
export declare const functionSkill: typeof skill;