Input Guard — Prompt Injection Scanner for External Data

Scans text fetched from untrusted external sources for embedded prompt injection attacks targeting the AI agent. This is a defensive layer that runs BEFORE the agent processes fetched content. Pure Python with zero external dependencies — works anywhere Python 3 is available.

Features

16 detection categories — instruction override, role manipulation, system mimicry, jailbreak, data exfiltration, and more
Multi-language support — English, Korean, Japanese, and Chinese patterns
4 sensitivity levels — low, medium (default), high, paranoid
Multiple output modes — human-readable (default), --json, --quiet
Multiple input methods — inline text, --file, --stdin
Exit codes — 0 for safe, 1 for threats detected (easy scripting integration)
Zero dependencies — standard library only, no pip install required
Optional MoltThreats integration — report confirmed threats to the community