@debugmcp/mcp-debugger/dist/cli/stdio-command.js

Run-time step-through debugging for LLM agents.

import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
export async function handleStdioCommand(options, dependencies) {
    const { logger, serverFactory, exitProcess = process.exit } = dependencies;
    if (options.logLevel) {
        logger.level = options.logLevel;
    }
    logger.info('Starting Debug MCP Server in stdio mode');
    try {
        const debugMcpServer = serverFactory({
            logLevel: options.logLevel,
            logFile: options.logFile
        });
        // Create stdio transport
        logger.info('[MCP] Creating StdioServerTransport...');
        const transport = new StdioServerTransport();
        // Connect MCP server to transport
        logger.info('[MCP] Connecting server to stdio transport...');
        await debugMcpServer.server.connect(transport);
        logger.info('[MCP] Server connected to stdio transport successfully');
        // Start the debug server
        await debugMcpServer.start();
        logger.info('Server started successfully in stdio mode');
        // Add transport error handling
        transport.onerror = (error) => {
            logger.error('[MCP] Transport error:', { error });
        };
        // Keep the process alive
        process.stdin.resume();
    }
    catch (error) {
        logger.error('Failed to start server in stdio mode', { error });
        // In stdio mode, we must not write to console as it corrupts MCP protocol
        exitProcess(1);
    }
}
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