The Microsoft C++ Language Server is now available as a plugin on the Copilot Plugins marketplace, featuring a new built-in setup skill that automates project setup to generate and maintain the `compile_commands.json` file. The language server relies on this file for precise semantic intelligence, including symbol navigation, diagnostics, and code changes. The new setup skills handle this automatically for CMake and MSBuild projects and provide a repeatable pattern for custom build systems. The C++ language server can be installed directly as a Copilot CLI plugin via `/plugin install cpp-language-server@copilot-plugins`, replacing the previous npm-based installation on Windows, Linux, and macOS. The generate compile commands skill lets users generate or refresh `compile_commands.json` from Copilot CLI by saying “regenerate compile commands” or “load project.” For CMake projects, users can alternatively pass `-DCMAKE_EXPORT_COMPILE_COMMANDS=TRUE` when configuring CMake. For MSBuild projects, options include guided setup via the skill or manual generation using the sample extractor application. For custom build systems, users can create a project-specific skill or manually provide their own `compile_commands.json` file.