Why a Better System Prompt Didn't Stop Prompt Injection: Field Notes on the Lethal Trifecta, Scoped Tools, and Untrusted Output
This story is from 2026-10-30. It is preserved in the archive; the latest stories are on the live feed.
Headline: Prompt injection cannot be fixed with a better system prompt, because a large language model reads instructions and data as one stream of tokens and has no reliable boundary between them. The defenses that hold are architectural: never give one agent run private data, untrusted content, a…
Read the full story at DEV Community — AI ↗
Timeline · 1 report
- 2026-10-30 07:00 · DEV Community — AI
Why a Better System Prompt Didn't Stop Prompt Injection: Field Notes on the Lethal Trifecta, Scoped Tools, and Untrusted Output