Content
# slopspotter
[](https://pypi.org/project/slopspotter/)
[](https://pypi.org/project/slopspotter/)
[](https://github.com/conranpearce/slopspotter/blob/main/LICENSE)
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
```bash
pip install slopspotter
```
## Usage
```bash
slopspotter requests
```
```json
{
"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:
```json
{
"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
```bash
claude mcp add slopspotter uvx --from slopspotter slopspotter-mcp
```
Or add manually to your project's `.mcp.json`:
```json
{
"mcpServers": {
"slopspotter": {
"type": "stdio",
"command": "uvx",
"args": ["--from", "slopspotter", "slopspotter-mcp"]
}
}
}
```
If you already have `slopspotter` installed via pip:
```json
{
"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?"