Koskamo

Rarefaction MCP

Rarefaction is an MCP server that provides AI coding agents with LSP call graph data for specific symbols, including callers, callees, tests, and impacted files. It allows agents to retrieve code context in a single bounded call instead of reading entire files, significantly reducing token usage and context window consumption. It supports multiple languages including TypeScript, Python, Rust, and Swift.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Rarefaction MCP logo, by ip2kCommunity listingLocal stdioSource reviewed; not executedPublished by ip2k
Vendor documentation

What you can do with it

  • Retrieve callers and callees for a specific function or symbol
  • Identify tests that reach a specific code symbol
  • Determine impacted files for a code change
  • Reduce token usage by avoiding whole-file reads

Source and maintenance

Community listingRegistry 0.4.2GPL-3.0
mcp-registry: io.github.ip2k/rarefaction-lsp-mcp@0.4.2Source repositoryProject website
Last repository push
Latest release
v0.4.2
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

rarefaction-lsp-mcp 0.4.2

npmnpx
rarefaction-lsp-mcp package definition
{
  "version": "0.4.2",
  "transport": "stdio",
  "identifier": "rarefaction-lsp-mcp",
  "runtimeHint": "npx",
  "registryType": "npm"
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "rarefaction-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "rarefaction-lsp-mcp@0.4.2"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "rarefaction-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "rarefaction-lsp-mcp@0.4.2"
      ]
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "rarefaction-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "rarefaction-lsp-mcp@0.4.2"
      ]
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "rarefaction-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "rarefaction-lsp-mcp@0.4.2"
      ]
    }
  }
}

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