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Skills

Skills are pre-packaged bundles of tools and instructions that give agents domain expertise.

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Quick Start

import { Agent, loadSkill, openai } from "@radaros/core";

const agent = new Agent({
  name: "assistant",
  model: openai("gpt-4o"),
  skills: [
    "./skills/shipping",           // local directory
    "@radaros/skill-crm",         // npm package
    "https://skills.example.com/analytics", // remote URL
  ],
});

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Skill Sources

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Local Directory

A directory with a skill.json manifest and tool modules: 
skills/shipping/
  skill.json
  tools.ts
  instructions.md

// skill.json
{
  "name": "shipping",
  "description": "Shipping rate calculation and tracking",
  "version": "1.0.0",
  "main": "tools.ts",
  "instructions": "instructions.md"
}

// tools.ts
import { defineTool } from "@radaros/core";
import { z } from "zod";

export function getTools() {
  return [
    defineTool({
      name: "calculate_shipping_rate",
      description: "Calculate shipping cost",
      parameters: z.object({
        weight: z.number(),
        destination: z.string(),
      }),
      execute: async (args) => {
        // calculation logic
        return `$${(args.weight * 0.5).toFixed(2)}`;
      },
    }),
  ];
}

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npm Package

Any npm package that exports tools: 
skills: ["@radaros/skill-crm"]
The package must export getTools(), tools, or a default export returning tool definitions.

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Remote URL

A hosted skill with a skill.json manifest: 
skills: ["https://skills.example.com/analytics"]
The remote server must serve skill.json and the main module at the specified paths.

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Creating a Skill Object

You can also pass pre-built Skill objects directly: 
import type { Skill } from "@radaros/core";

const mySkill: Skill = {
  name: "custom",
  description: "Custom skill",
  version: "1.0.0",
  tools: [/* ToolDef[] */],
  instructions: "Use these tools when...",
};

new Agent({ model, skills: [mySkill] });

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Lazy Loading

Skills are loaded on the first run() or connect() call, not at construction time. This avoids blocking agent creation with slow I/O operations.

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Skill Instructions

If a skill has an instructions field, it’s automatically injected into the system prompt: 
[Skill: shipping]
Use the calculate_shipping_rate tool when the user asks about shipping costs.
Always ask for weight and destination before calculating.