The README states " Important: When using STDIO transport, never write to STDOUT in your handlers". However the package itself does just this, on line 83-86 in ServeCommand.php, breaking compatibility with Claude Desktop and probably other MCP clients:

$this->info('Starting MCP server');
        $this->line("  - Transport: STDIO");
        $this->line("  - Communication: STDIN/STDOUT");
        $this->line("  - Mode: JSON-RPC over Standard I/O");

These should probably be written to the log instead.