MCP Language Server for Cursor: Setup & Config

What you can do with MCP Language in Cursor

Choose it to give an MCP coding assistant semantic navigation powered by an existing language server.

• Rename a symbol consistently across a project.
• Give a coding client language intelligence without embedding an IDE.

Before you start: MCP Language in Cursor

• Go
• Bridge installed with go install github.com/isaacphi/mcp-language-server@latest
• rust-analyzer installed for this example
• An MCP client and a local workspace

This is the README's Rust example. Replace the workspace path and choose the appropriate installed language server. Other documented configurations cover gopls, pyright, TypeScript, and clangd.

MCP Language Cursor configuration

1. Choose Cursor configuration scope

   For MCP Language Server, open Project: .cursor/mcp.json User: ~/.cursor/mcp.json. Merge into mcpServers at project or user scope.

2. Add MCP Language Server to Cursor

   Use the mcp-language-server entry below in mcpServers. Keep MCP Language Server's documented stdio connection fields and your other Cursor entries.

3. Check MCP Language Server in Cursor

   MCP Language Server: Enable in Cursor’s MCP settings; inspect tools.

{
  "mcpServers": {
    "mcp-language-server": {
      "command": "mcp-language-server",
      "args": [
        "--workspace",
        "/Users/you/dev/yourproject/",
        "--lsp",
        "rust-analyzer"
      ],
      "env": {}
    }
  }
}

MCP Language tools available to Cursor

MCP Language's stored tool list documents 6 tools; compare it with Cursor's connected tool list, because the stored list is not a live check.

definition

Find definition under MCP Language in Cursor's MCP settings; inspect its arguments when the agent requests a call.

references

Find references under MCP Language in Cursor's MCP settings; inspect its arguments when the agent requests a call.

diagnostics

Find diagnostics under MCP Language in Cursor's MCP settings; inspect its arguments when the agent requests a call.

hover

Find hover under MCP Language in Cursor's MCP settings; inspect its arguments when the agent requests a call.

Retrieve documentation and type details at a code location.

rename_symbol

Find rename_symbol under MCP Language in Cursor's MCP settings; inspect its arguments when the agent requests a call.

Apply a language-aware symbol rename across the project.

edit_file

Find edit_file under MCP Language in Cursor's MCP settings; inspect its arguments when the agent requests a call.

Apply multiple file changes using line positions.

MCP Language: full stored tool descriptions

Troubleshooting MCP Language in Cursor

• Cursor must find mcp-language-server for MCP Language Server. Enable the project/user entry in MCP settings and inspect its tools.
• MCP Language Server uses stdio here: Cursor must keep the configured process running; protocol output belongs on stdout and diagnostics on stderr.
• Known limitation: Requires a separately installed language server.
• Known limitation: The underlying server must communicate through stdio.
• Known limitation: The README labels the project beta software.
• General Cursor troubleshooting lives in the /clients/cursor guide.

Frequently asked questions