Prompt injection: testing controls and understanding limitations
A malicious instruction can arrive inside documents or tool responses. Separating instructions from data, limiting privileges and checking actions reduces exposure, but no single test proves infallible protection.
Ian · 2026-02-05
Practical guide
Prompt injection: testing controls and understanding limitations
A malicious instruction can arrive inside documents or tool responses. Separating instructions from data, limiting privileges and checking actions reduces exposure, but no single test proves infallible protection.
Planning a first application
- Treat retrieved documents and pages as untrusted data.
- Limit tools, network destinations and actions to the task.
- Test direct and indirect attacks and record which control fails.
What to check before deciding
Verify that restrictions exist in tools or infrastructure, not just prompts. Repeat relevant tests after model or connector changes. Retain human approval for sensitive actions and an incident response procedure.
Primary reference: OWASP · Prompt Injection
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