tool-agent

Tool-Using Agent Example

Agent with custom tools for real-world tasks.

Features

• Custom tool definitions with Zod validation
• Type-safe tool inputs/outputs
• Multi-step tool usage
• Error handling

What It Does

This agent has tools for:

• Weather lookup
• Calculator
• Web search (mock)
• Email sending (mock)

Run

npm install
npm start

Code Example

const tools = new ToolRegistry();

tools.register(
  tool({
    name: "calculate",
    description: "Perform math calculations",
    schema: z.object({
      expression: z.string()
    }),
    handler: async ({ expression }) => {
      try {
        return { result: eval(expression), success: true };
      } catch (error) {
        return { error: "Invalid expression", success: false };
      }
    }
  })
);

const agent = createAgent({
  name: "tool-agent",
  client,
  tools // Pass tools to agent
});

// Agent will automatically use tools when needed
await agent.run("What's 123 * 456?");

Add Your Own Tools

tools.register(
  tool({
    name: "my_tool",
    description: "What it does",
    schema: z.object({
      param1: z.string(),
      param2: z.number().optional()
    }),
    handler: async (input) => {
      // Your logic here
      return { result: "..." };
    }
  })
);

Best Practices

1. Clear Descriptions: Help the agent understand when to use the tool
2. Validate Inputs: Use Zod schemas for type safety
3. Handle Errors: Return structured error objects
4. Return Structured Data: Objects are better than strings

Next Steps

• Build a multi-agent system
• Add memory for context
• Create a web interface