12. Converting Tools for the API

Your internal Tool[] must be converted to Anthropic’s API format before each call.

File: packages/ai/src/providers/anthropic.ts L911-932

function convertTools(tools: Tool[]): Anthropic.Messages.Tool[] {
  return tools.map((tool) => {
    const schema = tool.parameters as { properties?: unknown; required?: string[] };
    return {
      name: tool.name,
      description: tool.description,
      input_schema: {
        type: "object",
        properties: schema.properties ?? {},
        required: schema.required ?? [],
      },
    };
  });
}

This is the bridge between TypeBox schemas (your side) and Anthropic’s JSON Schema format (API side). For your minimal harness, this is a direct mapping.