OpenAI has begun offering a nicer developer experience around tools. Anthropic's function calling is much newer. This repo provides a basic example of setting up few helper functions to allow you to declare the function call via Zod, making it completely type safe.
This also includes a failover to try again with a more powerful model if the initial parse fails.
copy .env.template to .env Add your Anthropic API Key
npm install
npm run example
This will enable easier configuration of functions, better validation, and full type safety when using tool calls
// Define the weather schema
const weatherParams = z.object({
location: z.string().describe("The city and state, e.g. San Francisco, CA"),
unit: z.enum(["celsius", "fahrenheit"]).optional().describe(
"The unit of temperature, either 'celsius' or 'fahrenheit'",
),
})
type WeatherParams = z.infer<typeof weatherParams>;
const weatherSchema = {
name: "get_weather",
description: "Get the current weather in a given location",
input_schema: weatherParams
};
// Example usage
const text = "What is the weather like in San Francisco?";
const result: WeatherParams = await parseTextToZodAnthropic<WeatherParams>({
text,
schema: weatherSchema,
});