[BUG] swift-lsp plugin installed but LSP tools not exposed to Claude

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

The swift-lsp@claude-plugins-official plugin is installed and the marketplace.json contains valid lspServers configuration, but Claude does not have access to any LSP tools for Swift files.

When I ask Claude to "use LSP to find all references", it responds that no LSP tools are available in its toolset.

What Should Happen?

Claude should have LSP tools (find_references, go_to_definition, hover, etc.) available for .swift files after installing the swift-lsp plugin.

Error Messages/Logs

No explicit error. Claude simply reports:
"I don't have an LSP tool available in my current toolset."

Plugin install directory only contains README.md:
~/.claude/plugins/cache/claude-plugins-official/swift-lsp/1.0.0/
└── README.md  (only file)

But marketplace.json has valid config:
"lspServers": {
  "sourcekit-lsp": {
    "command": "sourcekit-lsp",
    "extensionToLanguage": { ".swift": "swift" }
  }
}

Steps to Reproduce

1. Install the swift-lsp plugin:

claude plugins install swift-lsp@claude-plugins-official

1. Verify sourcekit-lsp is available:

which sourcekit-lsp
// Should return /usr/bin/sourcekit-lsp

1. Open any Swift project in Claude Code

1. Ask: "use LSP to find all references to [any symbol]"

1. Claude responds it has no LSP tools available

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.20 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

Diagnostic findings:

• sourcekit-lsp binary exists and works: /usr/bin/sourcekit-lsp
• Plugin shows in installed_plugins.json as v1.0.0
• Marketplace config at ~/.claude/plugins/marketplaces/claude-plugins-official/.claude-plugin/marketplace.json contains correct lspServers definition
• But the installed plugin directory only has README.md — no manifest wiring the LSP tools

Hypothesis: Claude Code reads lspServers from marketplace.json but doesn't start the LSP server or expose tools to the model.

Related issues: #14803, #16384