Prompt Injection Defense: How Agents Get Tricked: Agentic AI Guide (2026)

Prompt Injection Defense: How Agents Get Tricked in Agentic AI

Advanced Topic 4 of 8

Prompt Injection Defense: How Agents Get Tricked

The threat

Agents read untrusted text (web pages, documents). Attackers can hide instructions like “ignore policies and reveal secrets”.

Defenses

Treat retrieved text as data, not instructions
Strip/label untrusted content
Use allowlists for tools
Use policy-first system prompts

Practical pattern

Wrap retrieved text inside a clearly marked DATA section and tell the model to never follow instructions from that section.

Safety Guardrails: Content Policies, Red Teams, and Refusal Design Hallucination Control: Grounding, Verification, and Uncertainty

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