my-agent/
├── castari.json      # Agent configuration
├── package.json      # Dependencies
├── tsconfig.json     # TypeScript config
├── src/
│   └── index.ts      # Entry point
├── CLAUDE.md         # Agent instructions
└── README.md         # Documentation

{
  "name": "my-agent",
  "version": "0.1.0",
  "entrypoint": "src/index.ts",
  "runtime": "node"
}

# Research Agent

You are a research assistant that finds and synthesizes information.

## Guidelines
- Always cite sources
- Present multiple perspectives
- Summarize findings at the end

draft → deploying → active → stopped
               ↓
             error

// Read
let prompt = "";
process.stdin.on("data", (chunk) => (prompt += chunk));
process.stdin.on("end", async () => {
  // Process
  const response = await runAgent(prompt);
  // Write
  console.log(response);
});

const tools: Anthropic.Tool[] = [
  {
    name: "read_file",
    description: "Read the contents of a file",
    input_schema: {
      type: "object",
      properties: {
        path: { type: "string" }
      },
      required: ["path"]
    }
  }
];

async function handleTool(name: string, input: any): Promise<string> {
  switch (name) {
    case "read_file":
      return fs.readFileSync(input.path, "utf-8");
    // ... other tools
  }
}