zls

Claude Code LSPs

A collection of Language Server Protocol (LSP) plugins for Claude Code.

What is LSP Integration?

[!NOTE] LSP Integration: If you're on v2.0.69 through v2.0.x, LSP integration is broken due to a race condition (#14803, #13952). This has been fixed in v2.1.0+. Please upgrade to the latest version.

The Language Server Protocol provides IDE-like intelligence to Claude Code. On startup, Claude Code automatically starts LSP servers from installed plugins and exposes them to Claude in two ways:

LSP Tool - A builtin tool with 9 operations mapping directly to LSP commands:

Operation	Description
goToDefinition	Find where a symbol is defined
findReferences	Find all references to a symbol
hover	Get hover info (docs, type info) for a symbol
documentSymbol	Get all symbols (functions, classes, variables) in a document
workspaceSymbol	Search for symbols across the entire workspace
goToImplementation	Find implementations of an interface/abstract method
prepareCallHierarchy	Get call hierarchy item at a position
incomingCalls	Find all functions/methods that call the function at a position
outgoingCalls	Find all functions/methods called by the function at a position

Automatic Diagnostics - Real-time error and warning detection similar to the VS Code integration, but operating independently. These diagnostics tend to be faster and more comprehensive than the VS Code equivalent.

Available Plugins

Plugin	Language	Extensions	LSP
bash-language-server	Bash/Shell	.sh .bash .zsh .ksh	bash-language-server
clangd	C/C++/Objective-C	.c .h .cpp .hpp .cc .cxx .hxx .m .mm	clangd
clojure-lsp	Clojure	.clj .cljs .cljc .edn	clojure-lsp
dart-analyzer	Dart/Flutter	.dart	Dart SDK
elixir-ls	Elixir	.ex .exs	elixir-ls
gleam	Gleam	.gleam	gleam
gopls	Go	.go	gopls
intelephense	PHP	.php .phtml	Intelephense
jdtls	Java	.java	jdtls
kotlin-lsp	Kotlin	.kt .kts	kotlin-lsp
lua-language-server	Lua	.lua	lua-language-server
nixd	Nix	.nix	nixd