Rarefaction MCP Server: Install & Setup

Install Rarefaction in Claude Code

Claude Code

claude mcp add rarefaction -- npx -y rarefaction-lsp-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "rarefaction": {
      "command": "npx",
      "args": [
        "-y",
        "rarefaction-lsp-mcp"
      ]
    }
  }
}

LSP call graph for coding agents: a symbol's callers, callees, tests and live files in one call.

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add rarefaction -- npx -y rarefaction-lsp-mcp

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VelkyVenik/missingmcp

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faulkj/legion-mcp

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atla-ai/atla-mcp-server

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L1ch404/jolink-runtime

A lightweight Java IDE for AI agents: incremental builds, fast tests, HotSwap and live debugging.