seniorLLMs
How do you defend against prompt injection attacks?
Updated May 16, 2026
Short answer
Prompt injection defenses isolate instructions, validate tool access, filter inputs, and enforce policy boundaries.
Deep explanation
Prompt injection occurs when malicious instructions manipulate model behavior. This is especially dangerous in RAG and agentic systems where external content can influence prompts.
Defense strategies include:
- Separating system prompts from user inputs.
- Input sanitization and instruction filtering.
- Role isolation between trusted and untrusted data.
- Tool permission constraints.
- Secondary validation models.
- Sandboxed execution environments.
A secure architecture assumes all external content is untrusted.…
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