HALLUX MCP MCP server

HALLUX is a hallucination ledger that checks if a package, module, or DOI exists in its authoritative registry before an agent installs, imports, or cites it. It helps prevent supply-chain attacks like slopsquatting by identifying names that language models invent (phantoms) or have been registered maliciously (squats). The server provides verdicts such as exists, deprecated, absent, phantom, squat, and unknown to guide agent decisions.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by BlvkWare

MCP endpoint (Streamable HTTP)

https://api.blvkware.dev/hallux/mcp

Vendor documentation

What you can do with it

Check if a Python package exists before pip install
Verify if a DOI is valid before citation
Identify hallucinated package names (phantoms)
Detect maliciously registered names (squats)

Tools advertised by the last live check:

hallux_check_command
hallux_check
hallux_check_manifest
hallux_watch

Connect from your client

Each snippet registers the same endpoint; pick the client you 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.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http hallux-mcp https://api.blvkware.dev/hallux/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add hallux-mcp --url https://api.blvkware.dev/hallux/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable hallux-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "hallux-mcp": {
      "url": "https://api.blvkware.dev/hallux/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "hallux-mcp": {
      "type": "streamableHttp",
      "url": "https://api.blvkware.dev/hallux/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start hallux-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "hallux-mcp": {
      "type": "http",
      "url": "https://api.blvkware.dev/hallux/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http hallux-mcp https://api.blvkware.dev/hallux/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "hallux-mcp": {
      "url": "https://api.blvkware.dev/hallux/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "hallux-mcp": {
      "serverUrl": "https://api.blvkware.dev/hallux/mcp"
    }
  }
}

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