LSP workspaceSymbol returns no results with SourceKit-LSP (empty query parameter)

Description

The LSP workspaceSymbol operation always returns 0 results when used with SourceKit-LSP (Swift). This is because Claude Code sends an empty query parameter to the LSP server.

Environment

• Claude Code version: 2.1.15 (native binary)
• Platform: macOS (Darwin 25.2.0, arm64)
• LSP Server: SourceKit-LSP (Swift)

Steps to Reproduce

1. Open a Swift project with SourceKit-LSP configured
2. Use the LSP tool with workspaceSymbol operation on any Swift file
3. Observe: "No symbols found in workspace"

Expected Behavior

Should return symbols matching the file or a reasonable default query.

Actual Behavior

Returns no symbols because the request sends:

params: { query: "" }

SourceKit-LSP requires a non-empty query string to return results.

Root Cause

In the Claude Code source, the workspaceSymbol case builds the LSP request with an empty query:

case "workspaceSymbol": return { method: "workspace/symbol", params: { query: "" } }

Suggested Fix

Use the filename (without extension) as a default query when no explicit query is provided:

case "workspaceSymbol": return { 
  method: "workspace/symbol", 
  params: { query: filePath.split("/").pop().replace(/\.[^.]+$/, "") } 
}

This would convert:

• Astro001App.swift → query: "Astro001App"
• LocationViewModel.swift → query: "LocationViewModel"

Workaround

Currently using documentSymbol for single-file symbol lookup, but this doesn't support workspace-wide symbol search.

Additional Context

This issue affects all LSP servers that require a non-empty query for workspace/symbol. The LSP specification allows servers to return all symbols for an empty query, but SourceKit-LSP (and possibly other servers) require at least a partial match string.