swift-lsp connects the Swift (SourceKit-LSP) language server to Claude Code, giving it code intelligence and diagnostics for swift files. The plugin only wires up the server; the server binary must be installed separately.
What it does
Where Swift LSP (SourceKit-LSP) runs and what it adds, from its documentation
Registers the sourcekit-lsp language server (command: sourcekit-lsp) via the marketplace lspServers entry
Maps file extensions to the language: .swift
Gives Claude Code code intelligence and diagnostics for Swift (SourceKit-LSP) projects
When to use it
Good fit
Working in a Swift (SourceKit-LSP) codebase where Claude Code should use real language-server analysis
Wanting diagnostics and navigation from sourcekit-lsp without leaving Claude Code
Not for
Projects in other languages (it only maps the extensions listed)
Setups where you cannot install the sourcekit-lsp binary on PATH
How to install Swift LSP (SourceKit-LSP)
You need: Claude Code; sourcekit-lsp binary on PATH; Swift toolchain (includes SourceKit-LSP)
Install the language server binary first (the plugin does not bundle it):
macOS: install Xcode from the App Store, or brew install swift
Linux: download and install Swift from swift.org
Confirm sourcekit-lsp is available in your PATH
Install the plugin: /plugin install swift-lsp@claude-plugins-official
Permissions and security
What it can access
Launches the sourcekit-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
