@modelcontextprotocol/server-everything/dist/tools/echo.js

MCP server that exercises all the features of the MCP protocol

import { z } from "zod";
import { TOOL_ICONS } from "../server/icons.js";
// Tool input schema
export const EchoSchema = z.object({
    message: z.string().describe("Message to echo"),
});
// Tool configuration
const name = "echo";
const config = {
    title: "Echo Tool",
    description: "Echoes back the input string",
    inputSchema: EchoSchema,
    icons: TOOL_ICONS,
    annotations: {
        readOnlyHint: true,
        destructiveHint: false,
        idempotentHint: true,
        openWorldHint: false,
    },
};
/**
 * Registers the 'echo' tool.
 *
 * The registered tool validates input arguments using the EchoSchema and
 * returns a response that echoes the message provided in the arguments.
 *
 * @param {McpServer} server - The McpServer instance where the tool will be registered.
 * @returns {void}
 */
export const registerEchoTool = (server) => {
    server.registerTool(name, config, async (args) => {
        const validatedArgs = EchoSchema.parse(args);
        return {
            content: [{ type: "text", text: `Echo: ${validatedArgs.message}` }],
        };
    });
};