kotlin-lsp connects the Kotlin language server to Claude Code, giving it code intelligence and diagnostics for kt, .kts files. The plugin only wires up the server; the server binary must be installed separately.
What it does
Where Kotlin LSP runs and what it adds, from its documentation
Registers the kotlin-lsp language server (command: kotlin-lsp --stdio (startupTimeout 120000 ms)) via the marketplace lspServers entry
Maps file extensions to the language: .kt, ..kts
Gives Claude Code code intelligence and diagnostics for Kotlin projects
When to use it
Good fit
Working in a Kotlin codebase where Claude Code should use real language-server analysis
Wanting diagnostics and navigation from kotlin-lsp without leaving Claude Code
Not for
Projects in other languages (it only maps the extensions listed)
Setups where you cannot install the kotlin-lsp binary on PATH
How to install Kotlin LSP
You need: Claude Code; kotlin-lsp binary on PATH
Install the language server binary first (the plugin does not bundle it):
brew install JetBrains/utils/kotlin-lsp
Install the plugin: /plugin install kotlin-lsp@claude-plugins-official
Permissions and security
What it can access
Launches the kotlin-lsp process locally and reads the project files it analyzes
Security notes from the maintainers
Marketplace README: make sure you trust a plugin before installing, updating, or using it
Review the source before granting an agent access to credentials or production systems. We document what the maintainers state; we do not audit code.
Limitations
Requires the language server to be installed separately; the plugin does not install it
