To set up vim + modal + tabby, you need to ensure that your tabby-client config is correctly configured. Make sure the endpoint in the config file (~/.tabby-client/agent/config.toml) matches the URL you can access via the browser or curl.

Additionally, check if the [server] and [logs] lines in the config file are uncommented. If you have set the log level to debug and the log file (~/.tabby-clients/agent/logs/tabby-agent.log) is empty, double-check your config file and ensure that it follows the correct toml syntax.