chatos-ai

name	chatos-ai
description	AI feature development skill. Use when adding models, tools, providers, or streaming features to chatOS.

chatOS AI Development

Adding a New Model

Edit packages/ai/src/models.ts:

{
  id: "provider/model-name",
  name: "Display Name",
  provider: "provider",
  description: "Brief description",
}

Models are accessed via Vercel AI Gateway (@ai-sdk/gateway).

Adding a New Tool

1. Create tool definition in packages/ai/src/tools/:

import { z } from "zod";

export const myTool = {
  description: "What this tool does",
  parameters: z.object({
    param: z.string().describe("Parameter description"),
  }),
  execute: async ({ param }: { param: string }) => {
    // Implementation
    return { result: "value" };
  },
};

2. Export from packages/ai/src/tools/index.ts
3. Register in the chat API route in apps/web

Streaming Pattern

import { streamText } from "ai";
import { gateway } from "@ai-sdk/gateway";

const result = streamText({
  model: gateway("anthropic/claude-sonnet-4.5"),
  messages,
  tools: { weather: weatherTool },
});

Resumable Streams

Redis-backed via resumable-stream package. See packages/ai/src/streaming.ts.

System Prompts

Edit packages/ai/src/prompts.ts. Reasoning models skip artifact prompts.