slopspotter

Detects AI-hallucinated Python packages before they get installed.

Checks a package against a curated hallucinated packages database and verifies its existence on PyPI in real time, returning a risk assessment with a clear install recommendation.

Installs two tools:

• slopspotter — CLI for manual package checks
• slopspotter-mcp — stdio MCP server for AI coding agents

Installation

pip install slopspotter

Usage

slopspotter requests

{
  "package": "requests",
  "exists": true,
  "pypi_unavailable": false,
  "in_slop_db": false,
  "risk_level": "low",
  "safe_to_install": true,
  "recommendation": "PROCEED: 'requests' appears safe to install."
}

Example high risk output:

{
  "package": "cohere-ai-sdk",
  "exists": false,
  "pypi_unavailable": false,
  "in_slop_db": true,
  "risk_level": "high",
  "safe_to_install": false,
  "recommendation": "BLOCK: 'cohere-ai-sdk' does not exist on PyPI and is flagged as a hallucinated package."
}

Exit codes: 0 = low risk, 1 = medium, 2 = high, 3 = critical.

Risk Levels

Level	Meaning
low	Exists on PyPI, not flagged
medium	Flagged with low historical risk
high	Not on PyPI (hallucinated), flagged, or PyPI unreachable
critical	Flagged and actively installable on PyPI

How It Works

Each package is checked against a curated database of known AI-hallucinated packages and verified against PyPI in real time. The database is maintained by the project author.

MCP Server

slopspotter ships with a stdio MCP server for use with AI coding agents (Claude Code, Cursor, etc.). Once connected, the agent will automatically call assess_package before any install and block unsafe packages.

Claude Code

claude mcp add slopspotter uvx --from slopspotter slopspotter-mcp

Or add manually to your project's .mcp.json:

{
  "mcpServers": {
    "slopspotter": {
      "type": "stdio",
      "command": "uvx",
      "args": ["--from", "slopspotter", "slopspotter-mcp"]
    }
  }
}

If you already have slopspotter installed via pip:

{
  "mcpServers": {
    "slopspotter": {
      "type": "stdio",
      "command": "slopspotter-mcp"
    }
  }
}

Other agents (Cursor, Windsurf, etc.)

Use the same JSON config — most agents support the mcpServers format.

Usage

Once connected, your agent will automatically assess packages before installing. You can also ask directly:

"Is requests safe to install?"