Free CLI tool launches to scan LLM endpoints for 15 prompt-injection attacks
Ventrovadev · reddit · 2026-08-25
A new open-source CLI tool, sentinel-scan-cli, has been released to help developers quickly check the resilience of their MCP or LLM endpoints against common prompt-injection attacks.
- Attack Vectors: It runs a fixed set of 15 attacks, including direct override, DAN-style roleplay, base64 smuggling, and markdown exfiltration.
- Usage: A demo mode allows testing without an API key in about a minute, while users can also point it at their own endpoints.
- Mechanism: The tool uses string matching on planted secrets and refusal-phrase checks. It acts as a fast heuristic, not a full audit, and may yield false positives or negatives.
- License: MIT licensed with no signup required.
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