# Prompt Injection Defense

> **Status:** Placeholder. Content currently lives inline in [enforcement](enforcement.md). A dedicated page will extract detection and mitigation sections.

## Quick Reference

Prompt injection is a user-supplied input that attempts to override the agent's system prompt or steal credentials. TnsAI provides heuristic and model-based detection.

See [Enforcement](enforcement.md) for the current prompt-injection section.

## Planned Content

- Heuristic patterns (role override, credential extraction, instruction smuggling).
- Model-based detection via a dedicated classifier.
- Output sanitization.
- Defense-in-depth: input filter + system prompt hardening + output review.