Clangd LSP

Clangd LSP adds the LLVM/Clang language server to Claude Code so you get precise C and C++ editing features inside the editor. It reads your project compile_commands.json or compile flags, builds an index across files, and provides on-the-fly diagnostics, semantic highlighting, and accurate code completions for .c, .h, .cpp, .cc, .cxx, .hpp, and .hxx files. It also runs formatters and applies code actions such as include fixes and quick refactors.

The server answers go-to-definition, find-references, and symbol-search requests across translation units, so you can jump from a declaration to the implementation or track where a function is used. It watches file changes, keeps the index up to date, and returns diagnostics with precise locations. It also respects header search paths and preprocessor macros from your build configuration so suggestions match real build behavior.

For a concrete workflow: open a mixed C/C++ codebase, let clangd read compile_commands.json, then fix an error shown by the diagnostic, jump to the header that defines the type, and apply the include-fixer code action without leaving Claude Code. That avoids switching to a separate IDE to debug missing includes or hunt references across files, saving minutes per bugfix and keeping you focused in one tool.