import type { Extension } from "../src/types.js";

const exampleExtension: Extension = async ({
  registerTool,
  registerCommand,
  on,
  addSystemPrompt
}) => {
  await registerTool({
    name: "echo",
    description: "Echo text back exactly as provided.",
    parameters: {
      type: "object",
      properties: {
        text: { type: "string" }
      },
      required: ["text"],
      additionalProperties: false
    },
    execute(input: { text: string }) {
      return input.text;
    }
  });

  await registerCommand({
    name: "tools",
    description: "Show tools registered by the example extension.",
    execute() {
      return "Example extension tools: echo";
    }
  });

  addSystemPrompt("The echo tool is available when exact repetition is useful.");

  on("tool.call.completed", ({ tool }) => {
    if (tool === "echo") {
      // Placeholder for extension-side behavior such as metrics or persistence.
    }
  });
};

export default exampleExtension;