@modelcontextprotocol/sdk
Version:
Model Context Protocol implementation for TypeScript
487 lines • 17.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const index_js_1 = require("../../client/index.js");
const streamableHttp_js_1 = require("../../client/streamableHttp.js");
const node_readline_1 = require("node:readline");
const types_js_1 = require("../../types.js");
// Create readline interface for user input
const readline = (0, node_readline_1.createInterface)({
input: process.stdin,
output: process.stdout
});
// Track received notifications for debugging resumability
let notificationCount = 0;
// Global client and transport for interactive commands
let client = null;
let transport = null;
let serverUrl = 'http://localhost:3000/mcp';
let notificationsToolLastEventId = undefined;
let sessionId = undefined;
async function main() {
console.log('MCP Interactive Client');
console.log('=====================');
// Connect to server immediately with default settings
await connect();
// Print help and start the command loop
printHelp();
commandLoop();
}
function printHelp() {
console.log('\nAvailable commands:');
console.log(' connect [url] - Connect to MCP server (default: http://localhost:3000/mcp)');
console.log(' disconnect - Disconnect from server');
console.log(' terminate-session - Terminate the current session');
console.log(' reconnect - Reconnect to the server');
console.log(' list-tools - List available tools');
console.log(' call-tool <name> [args] - Call a tool with optional JSON arguments');
console.log(' greet [name] - Call the greet tool');
console.log(' multi-greet [name] - Call the multi-greet tool with notifications');
console.log(' start-notifications [interval] [count] - Start periodic notifications');
console.log(' run-notifications-tool-with-resumability [interval] [count] - Run notification tool with resumability');
console.log(' list-prompts - List available prompts');
console.log(' get-prompt [name] [args] - Get a prompt with optional JSON arguments');
console.log(' list-resources - List available resources');
console.log(' help - Show this help');
console.log(' quit - Exit the program');
}
function commandLoop() {
readline.question('\n> ', async (input) => {
var _a;
const args = input.trim().split(/\s+/);
const command = (_a = args[0]) === null || _a === void 0 ? void 0 : _a.toLowerCase();
try {
switch (command) {
case 'connect':
await connect(args[1]);
break;
case 'disconnect':
await disconnect();
break;
case 'terminate-session':
await terminateSession();
break;
case 'reconnect':
await reconnect();
break;
case 'list-tools':
await listTools();
break;
case 'call-tool':
if (args.length < 2) {
console.log('Usage: call-tool <name> [args]');
}
else {
const toolName = args[1];
let toolArgs = {};
if (args.length > 2) {
try {
toolArgs = JSON.parse(args.slice(2).join(' '));
}
catch (_b) {
console.log('Invalid JSON arguments. Using empty args.');
}
}
await callTool(toolName, toolArgs);
}
break;
case 'greet':
await callGreetTool(args[1] || 'MCP User');
break;
case 'multi-greet':
await callMultiGreetTool(args[1] || 'MCP User');
break;
case 'start-notifications': {
const interval = args[1] ? parseInt(args[1], 10) : 2000;
const count = args[2] ? parseInt(args[2], 10) : 10;
await startNotifications(interval, count);
break;
}
case 'run-notifications-tool-with-resumability': {
const interval = args[1] ? parseInt(args[1], 10) : 2000;
const count = args[2] ? parseInt(args[2], 10) : 10;
await runNotificationsToolWithResumability(interval, count);
break;
}
case 'list-prompts':
await listPrompts();
break;
case 'get-prompt':
if (args.length < 2) {
console.log('Usage: get-prompt <name> [args]');
}
else {
const promptName = args[1];
let promptArgs = {};
if (args.length > 2) {
try {
promptArgs = JSON.parse(args.slice(2).join(' '));
}
catch (_c) {
console.log('Invalid JSON arguments. Using empty args.');
}
}
await getPrompt(promptName, promptArgs);
}
break;
case 'list-resources':
await listResources();
break;
case 'help':
printHelp();
break;
case 'quit':
case 'exit':
await cleanup();
return;
default:
if (command) {
console.log(`Unknown command: ${command}`);
}
break;
}
}
catch (error) {
console.error(`Error executing command: ${error}`);
}
// Continue the command loop
commandLoop();
});
}
async function connect(url) {
if (client) {
console.log('Already connected. Disconnect first.');
return;
}
if (url) {
serverUrl = url;
}
console.log(`Connecting to ${serverUrl}...`);
try {
// Create a new client
client = new index_js_1.Client({
name: 'example-client',
version: '1.0.0'
});
client.onerror = (error) => {
console.error('\x1b[31mClient error:', error, '\x1b[0m');
};
transport = new streamableHttp_js_1.StreamableHTTPClientTransport(new URL(serverUrl), {
sessionId: sessionId
});
// Set up notification handlers
client.setNotificationHandler(types_js_1.LoggingMessageNotificationSchema, (notification) => {
notificationCount++;
console.log(`\nNotification #${notificationCount}: ${notification.params.level} - ${notification.params.data}`);
// Re-display the prompt
process.stdout.write('> ');
});
client.setNotificationHandler(types_js_1.ResourceListChangedNotificationSchema, async (_) => {
console.log(`\nResource list changed notification received!`);
try {
if (!client) {
console.log('Client disconnected, cannot fetch resources');
return;
}
const resourcesResult = await client.request({
method: 'resources/list',
params: {}
}, types_js_1.ListResourcesResultSchema);
console.log('Available resources count:', resourcesResult.resources.length);
}
catch (_a) {
console.log('Failed to list resources after change notification');
}
// Re-display the prompt
process.stdout.write('> ');
});
// Connect the client
await client.connect(transport);
sessionId = transport.sessionId;
console.log('Transport created with session ID:', sessionId);
console.log('Connected to MCP server');
}
catch (error) {
console.error('Failed to connect:', error);
client = null;
transport = null;
}
}
async function disconnect() {
if (!client || !transport) {
console.log('Not connected.');
return;
}
try {
await transport.close();
console.log('Disconnected from MCP server');
client = null;
transport = null;
}
catch (error) {
console.error('Error disconnecting:', error);
}
}
async function terminateSession() {
if (!client || !transport) {
console.log('Not connected.');
return;
}
try {
console.log('Terminating session with ID:', transport.sessionId);
await transport.terminateSession();
console.log('Session terminated successfully');
// Check if sessionId was cleared after termination
if (!transport.sessionId) {
console.log('Session ID has been cleared');
sessionId = undefined;
// Also close the transport and clear client objects
await transport.close();
console.log('Transport closed after session termination');
client = null;
transport = null;
}
else {
console.log('Server responded with 405 Method Not Allowed (session termination not supported)');
console.log('Session ID is still active:', transport.sessionId);
}
}
catch (error) {
console.error('Error terminating session:', error);
}
}
async function reconnect() {
if (client) {
await disconnect();
}
await connect();
}
async function listTools() {
if (!client) {
console.log('Not connected to server.');
return;
}
try {
const toolsRequest = {
method: 'tools/list',
params: {}
};
const toolsResult = await client.request(toolsRequest, types_js_1.ListToolsResultSchema);
console.log('Available tools:');
if (toolsResult.tools.length === 0) {
console.log(' No tools available');
}
else {
for (const tool of toolsResult.tools) {
console.log(` - ${tool.name}: ${tool.description}`);
}
}
}
catch (error) {
console.log(`Tools not supported by this server (${error})`);
}
}
async function callTool(name, args) {
if (!client) {
console.log('Not connected to server.');
return;
}
try {
const request = {
method: 'tools/call',
params: {
name,
arguments: args
}
};
console.log(`Calling tool '${name}' with args:`, args);
const result = await client.request(request, types_js_1.CallToolResultSchema);
console.log('Tool result:');
result.content.forEach(item => {
if (item.type === 'text') {
console.log(` ${item.text}`);
}
else {
console.log(` ${item.type} content:`, item);
}
});
}
catch (error) {
console.log(`Error calling tool ${name}: ${error}`);
}
}
async function callGreetTool(name) {
await callTool('greet', { name });
}
async function callMultiGreetTool(name) {
console.log('Calling multi-greet tool with notifications...');
await callTool('multi-greet', { name });
}
async function startNotifications(interval, count) {
console.log(`Starting notification stream: interval=${interval}ms, count=${count || 'unlimited'}`);
await callTool('start-notification-stream', { interval, count });
}
async function runNotificationsToolWithResumability(interval, count) {
if (!client) {
console.log('Not connected to server.');
return;
}
try {
console.log(`Starting notification stream with resumability: interval=${interval}ms, count=${count || 'unlimited'}`);
console.log(`Using resumption token: ${notificationsToolLastEventId || 'none'}`);
const request = {
method: 'tools/call',
params: {
name: 'start-notification-stream',
arguments: { interval, count }
}
};
const onLastEventIdUpdate = (event) => {
notificationsToolLastEventId = event;
console.log(`Updated resumption token: ${event}`);
};
const result = await client.request(request, types_js_1.CallToolResultSchema, {
resumptionToken: notificationsToolLastEventId,
onresumptiontoken: onLastEventIdUpdate
});
console.log('Tool result:');
result.content.forEach(item => {
if (item.type === 'text') {
console.log(` ${item.text}`);
}
else {
console.log(` ${item.type} content:`, item);
}
});
}
catch (error) {
console.log(`Error starting notification stream: ${error}`);
}
}
async function listPrompts() {
if (!client) {
console.log('Not connected to server.');
return;
}
try {
const promptsRequest = {
method: 'prompts/list',
params: {}
};
const promptsResult = await client.request(promptsRequest, types_js_1.ListPromptsResultSchema);
console.log('Available prompts:');
if (promptsResult.prompts.length === 0) {
console.log(' No prompts available');
}
else {
for (const prompt of promptsResult.prompts) {
console.log(` - ${prompt.name}: ${prompt.description}`);
}
}
}
catch (error) {
console.log(`Prompts not supported by this server (${error})`);
}
}
async function getPrompt(name, args) {
if (!client) {
console.log('Not connected to server.');
return;
}
try {
const promptRequest = {
method: 'prompts/get',
params: {
name,
arguments: args
}
};
const promptResult = await client.request(promptRequest, types_js_1.GetPromptResultSchema);
console.log('Prompt template:');
promptResult.messages.forEach((msg, index) => {
console.log(` [${index + 1}] ${msg.role}: ${msg.content.text}`);
});
}
catch (error) {
console.log(`Error getting prompt ${name}: ${error}`);
}
}
async function listResources() {
if (!client) {
console.log('Not connected to server.');
return;
}
try {
const resourcesRequest = {
method: 'resources/list',
params: {}
};
const resourcesResult = await client.request(resourcesRequest, types_js_1.ListResourcesResultSchema);
console.log('Available resources:');
if (resourcesResult.resources.length === 0) {
console.log(' No resources available');
}
else {
for (const resource of resourcesResult.resources) {
console.log(` - ${resource.name}: ${resource.uri}`);
}
}
}
catch (error) {
console.log(`Resources not supported by this server (${error})`);
}
}
async function cleanup() {
if (client && transport) {
try {
// First try to terminate the session gracefully
if (transport.sessionId) {
try {
console.log('Terminating session before exit...');
await transport.terminateSession();
console.log('Session terminated successfully');
}
catch (error) {
console.error('Error terminating session:', error);
}
}
// Then close the transport
await transport.close();
}
catch (error) {
console.error('Error closing transport:', error);
}
}
process.stdin.setRawMode(false);
readline.close();
console.log('\nGoodbye!');
process.exit(0);
}
// Set up raw mode for keyboard input to capture Escape key
process.stdin.setRawMode(true);
process.stdin.on('data', async (data) => {
// Check for Escape key (27)
if (data.length === 1 && data[0] === 27) {
console.log('\nESC key pressed. Disconnecting from server...');
// Abort current operation and disconnect from server
if (client && transport) {
await disconnect();
console.log('Disconnected. Press Enter to continue.');
}
else {
console.log('Not connected to server.');
}
// Re-display the prompt
process.stdout.write('> ');
}
});
// Handle Ctrl+C
process.on('SIGINT', async () => {
console.log('\nReceived SIGINT. Cleaning up...');
await cleanup();
});
// Start the interactive client
main().catch((error) => {
console.error('Error running MCP client:', error);
process.exit(1);
});
//# sourceMappingURL=simpleStreamableHttp.js.map