/**
* Console Interceptor for MCP Server
*
* This module intercepts all console.log and console.error calls
* to ensure debug logs don't interfere with the MCP protocol.
*
* It should be imported at the very beginning of the application.
*/
// Store original console methods
const originalConsoleLog = console.log;
const originalConsoleError = console.error;
// Regular expression to detect debug logs
const debugLogRegex = /\[DEBUG\]/;
// Custom log formatter that won't interfere with MCP protocol
function formatDebugLog(message: string, ...args: unknown[]): string {
// Format: @@LOG@@{message}@@{args}@@
// This format is unlikely to be parsed as JSON and can be filtered out by the MCP inspector
const argsStr = args.length > 0 ? `@@${JSON.stringify(args)}@@` : '';
return `@@LOG@@${message}${argsStr}@@`;
}
// Override console.log
console.log = function (message: unknown, ...args: unknown[]): void {
// Check if this is a debug log
if (typeof message === 'string' && debugLogRegex.test(message)) {
// For debug logs, write to stderr with special formatting
process.stderr.write(formatDebugLog(message, ...args) + '\n');
} else {
// For non-debug logs, use the original console.log
originalConsoleLog(message, ...args);
}
};
// Override console.error
console.error = function (message: unknown, ...args: unknown[]): void {
// Check if this is a debug log
if (typeof message === 'string' && debugLogRegex.test(message)) {
// For debug logs, write to stderr with special formatting
process.stderr.write(formatDebugLog(message, ...args) + '\n');
} else {
// For non-debug logs, use the original console.error
originalConsoleError(message, ...args);
}
};
// Export a function to restore original console methods if needed
export function restoreConsole(): void {
console.log = originalConsoleLog;
console.error = originalConsoleError;
}
