The NSQL MCP Server can be extended with your own custom tools, prompts, and resources, packaged as a JAR and dropped into the server's extensions directory. This lets you tailor it to domain-specific queries or workflows without waiting on core product changes. Extensions are off by default, and each JAR is verified against a pinned checksum before it's loaded, so only code you've explicitly approved ever runs.
To build your own extensions, the Server Extensions SDK gives you everything you need — annotations, interfaces, and a reference example.